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Journal articles on the topic 'Column and Separation Efficiency'

Author: Grafiati

Published: 3 June 2025

Last updated: 1 August 2025

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1

Patel, Nishiben, Krishna R. Gupta, and Milind J. Umekar. "An Overview of Monolithic Column: Types, Parameters and Applications." Journal of Drug Delivery and Therapeutics 12, no. 4-S (2022): 223–31. http://dx.doi.org/10.22270/jddt.v12i4-s.5521.

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The column is the main component for chromatographic separation. Nowadays, monolithic columns are graining more popularity in the field of separation media for liquid chromatography. The monolith columns possess great potential as compared to the conventional packed column in terms of preparing complex mixtures. These columns provide various properties like higher permeability, high-efficiency fast separations, high flow rate with lower backpressure, fast mass transfer kinetics with a high binding capacity. It is categories into three columns and they are organic monolithic column, inorganic m

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2

Cutler, Bruce, Joseph Algaier, and Frantisek Svec. "SEM analysis of in situ polymerization products for chromatographic separations." Proceedings, annual meeting, Electron Microscopy Society of America 54 (August 11, 1996): 176–77. http://dx.doi.org/10.1017/s0424820100163344.

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Two inherent problems associated with chromatographic separations are peak broadening and column efficiency. These are directly attributable to the interparticular porosity of the separation media in which limited utilization of column space results in column void volumes. In theory, a minimum of 26% void volume will occur if a column is packed using perfectly arranged monodispersed beads. Typically, with the best packed columns void volumes are 30 to 40%. Svec and Fréchet have introduced an HPLC separation media with no discontinuity that are prepared in a single step by a free-radical polyme

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3

Kurdi, Said El, Dina Abu Muaileq, Hassan A. Alhazmi, Mohammed Al Bratty, and Sami El Deeb. "Comparing monolithic and fused core HPLC columns for fast chromatographic analysis of fat-soluble vitamins." Acta Pharmaceutica 67, no. 2 (2017): 203–13. http://dx.doi.org/10.1515/acph-2017-0013.

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AbstractHPLC stationary phases of monolithic and fused core type can be used to achieve fast chromatographic separation as an alternative to UPLC. In this study, monolithic and fused core stationary phases are compared for fast separation of four fat-soluble vitamins. Three new methods on the first and second generation monolithic silica RP-18e columns and a fused core pentafluoro-phenyl propyl column were developed. Application of three fused core columns offered comparable separations of retinyl palmitate, DL-α-tocopheryl acetate, cholecalciferol and menadione in terms of elution speed and s

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4

Horváth, Szabolcs, Diána Lukács, Evelin Farsang, and Krisztián Horváth. "Study of Efficiency of Capacity Gradient Ion-Exchange Stationary Phases." Separations 10, no. 1 (2022): 14. http://dx.doi.org/10.3390/separations10010014.

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Highly efficient columns are necessary for the modern analytical applications of liquid chromatography. In this work, the separation efficiency of ion-exchange capacity gradient stationary phases combined with eluent concentration gradient was studied by a theoretical approach. In the course of our work three different scenarios of capacity gradients were used with different shapes (linear, convex and concave). The resolutions of different gradient columns were calculated for each scenario. As a reference, a uniform column was considered, which had the same analysis time as the non-uniform col

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Leela, Bhaskar K. 1* Vasubabu P. 2. Kanthi Sheela A. 3. Sri Pavan Kumar Ch 4. Sunand Kumar M. 5. "A REVIEW ON CORE SHELL TECHNOLOGY IN HIGH PERFORMANCE LIQUID CHROMATOGRAPHY: DRUG ANALYSIS." Journal of Pharma Research 7, no. 10 (2018): 231–35. https://doi.org/10.5281/zenodo.1471873.

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<strong><em>ABSTRACT</em></strong> <strong><em>C</em></strong><em>olumn is the heart of the chromatographic systems. Now a days in order to increase the separation efficiency a new technology of column packed with core shell particles was used in HPLC .The core shell particles revolutionized the chromatography industry by providing faster methods without sacrificing resolution .this specialized particles provides higher efficiency and through put which leads to a reduction in solvent consumption. The literature here by describe the performance difference between  the core shell particles

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Chen, Guoqiang, and Raja Ghosh. "Effect of the Length-to-Width Aspect Ratio of a Cuboid Packed-Bed Device on Efficiency of Chromatographic Separation." Processes 6, no. 9 (2018): 160. http://dx.doi.org/10.3390/pr6090160.

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In recent papers we have discussed the use of cuboid packed-bed devices as alternative to columns for chromatographic separations. These devices address some of the major flow distribution challenges faced by preparative columns used for process-scale purification of biologicals. Our previous studies showed that significant improvements in separation metrics such as the number of theoretical plates, peak shape, and peak resolution in multi-protein separation could be achieved. However, the length-to-width aspect ratio of a cuboid packed-bed device could potentially affect its performance. A sy

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7

Roehrer, Simon, and Mirjana Minceva. "Evaluation of Inter-Apparatus Separation Method Transferability in Countercurrent Chromatography and Centrifugal Partition Chromatography." Separations 6, no. 3 (2019): 36. http://dx.doi.org/10.3390/separations6030036.

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In the countercurrent chromatography and centrifugal partition chromatography, separation method transfer and scale-up is often described as an easy and straightforward procedure. Separation methods are usually developed on lab scale columns and subsequently transferred using linear scale-up factors to semi-preparative or preparative columns of the same column design. However, the separation methods described in the literature have been developed on various columns of different design and size. This is accompanied by differences in the separation behavior of the columns and therefore makes sep

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8

Chen, Ruo-nan, Zhi-qiang Cai, Wei Zhang, et al. "An Amphiphilic Star-Shaped Polymer (Star-PEG-PCL2) used as a Stationary Phase for GC." Acta Chimica Slovenica 70, no. 1 (2023): 1–11. http://dx.doi.org/10.17344/acsi.2022.7390.

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A star-shaped polymer (Star-PEG-PCL2) was synthesized to with PCL and PEG, and used as a stationary phase for gas chromatography. The statically coated Star-PEG-PCL2 column exhibited an efficiency of 2260 plates/m determined by naphthalene at 120 °C and moderate polarity. The Star-PEG-PCL2 column showed high resolution performance for isomers of a wide ranging polarity, including methylnaphthalenes, halogenated benzenes, nitrobenzene, phenols, and anilines, and displayed dual-nature selectivity for a mixture of 17 analytes. Also, the Star-PEG-PCL2 column exhibited good separation performance a

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9

Liao, Weilin, Xiangyu Zhao, Hsueh-Tsung Lu, Tsenguun Byambadorj, Yutao Qin, and Yogesh B. Gianchandani. "Progressive Cellular Architecture in Microscale Gas Chromatography for Broad Chemical Analyses." Sensors 21, no. 9 (2021): 3089. http://dx.doi.org/10.3390/s21093089.

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Gas chromatography is widely used to identify and quantify volatile organic compounds for applications ranging from environmental monitoring to homeland security. We investigate a new architecture for microfabricated gas chromatography systems that can significantly improve the range, speed, and efficiency of such systems. By using a cellular approach, it performs a partial separation of analytes even as the sampling is being performed. The subsequent separation step is then rapidly performed within each cell. The cells, each of which contains a preconcentrator and separation column, are arran

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10

Ali, Ashraf, Sarah Alharthi, Nora Hamad Al-Shaalan, and Eman Y. Santali. "Development of Narrow-Bore C18 Column for Fast Separation of Peptides and Proteins in High-Performance Liquid Chromatography." Polymers 14, no. 13 (2022): 2576. http://dx.doi.org/10.3390/polym14132576.

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Separation with high efficiency and good resolution is constantly in demand in the pharmaceutical industry. The fast and efficient separation of complex samples such as peptides and proteins is a challenging task. To achieve high efficiency with good resolution, chromatographers are moving towards small particles packed into narrow-bore columns. Silica monolith particles (sub-2 µm) were derivatized with chlorodimethyl octadecyl silane (C18) and packed into stainless steel columns (100 mm × 1.8 mm i.d) by a slurry-packing method. The developed columns were used for the separation of peptides an

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11

Natig Abbasov, Natig Abbasov, and Rufet Ezizli Rufet Ezizli. "IMPROVING THE EFFICIENCY OF THE STABILIZATION COLUMNS IN OIL AND GAS PROCESSING." ETM - Equipment, Technologies, Materials 10, no. 02 (2022): 81–89. http://dx.doi.org/10.36962/etm10022022-81.

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Rectification process is widely used in oil and gas processing and petrochemistry. The composition of the bottom product of the rectification column usually differs from the equilibrium composition due to significantly higher content of light components or fractions. This stipulates a necessity to include into the technological schemes of several oil refining processes a stabilization unit that are meant to ensure separation of gases and liquid products. A highly relevant task is to explore new possibilities for improving the stabilization process. The aim of the present work was to improve th

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Balunov, Alexander, Ivan Sukin, and Anatoly Tsirlin. "Entropic Balance Conditions and Optimization of Distillation Column System." Entropy 23, no. 11 (2021): 1468. http://dx.doi.org/10.3390/e23111468.

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The paper considers the limitation problem of the distillation column systems separating multicomponent mixtures with serial and parallel structures. The solution takes into account the irreversibility of processes. Using entropic balance conditions, the dependence of load on heat consumption is obtained for a binary distillation column. This dependence is parameterized through two characteristic coefficients–reversible efficiency and irreversibility factor. This dependence was used to solve problems of distribution of heat and raw material fluxes in parallel column structure and selection of

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13

Zbytovský, Jiří, Tomáš Sommer, Martin Zapletal, and Jiří Trejbal. "Comparison of various column packing materials efficiency for hydrocarbons and aqueous mixtures." Chemical & biochemical engineering quarterly 33, no. 2 (2019): 183–90. http://dx.doi.org/10.15255/cabeq.2018.1565.

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The efficiency of industrial column packings is commonly tested by standard hydrocarbon mixtures. However, a reduced efficiency value is often observed, particularly during distillation of aqueous mixtures. In this paper, distillation experiments with various binary mixtures were carried out on different column packings to evaluate relative separation efficiencies of mixtures for each packing material. Each of the binary mixtures, which comprised heptane–methylcyclohexane, ethanol–water, morpholine–water, and acetic acid–water, was distilled under atmospheric pressure and total reflux ratio on

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14

Aydoğan, Cemil, İbrahim Y. Erdoğan, and Ziad El-Rassi. "Hydrophobic AEROSIL®R972 Fumed Silica Nanoparticles Incorporated Monolithic Nano-Columns for Small Molecule and Protein Separation by Nano-Liquid Chromatography." Molecules 27, no. 7 (2022): 2306. http://dx.doi.org/10.3390/molecules27072306.

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A new feature of hydrophobic fumed silica nanoparticles (HFSNPs) when they apply to the preparation of monolithic nano-columns using narrow monolithic fused silica capillary columns (e.g., 50-µm inner diameter) was presented. The monolithic nano-columns were synthesized by an in-situ polymerization using butyl methacrylate (BMA) and ethylene dimethacrylate (EDMA) at various concentrations of AEROSIL®R972, called HFSNPs. Dimethyl formamide (DMF) and water were used as the porogenic solvents. These columns (referred to as HFSNP monoliths) were successfully characterized by using scanning electro

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15

Liu, Qing, Chao Yan, and Yan Wang. "Submicron Nonporous Silica Particles for Enhanced Separation Performance in pCEC." Molecules 28, no. 8 (2023): 3542. http://dx.doi.org/10.3390/molecules28083542.

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Applications of submicron-scale particles are of rising interest in separation science due to their favorable surface-to-volume ratio and their fabrication of highly ordered structures. The uniformly dense packing beds in columns assembled from nanoparticles combined with an electroosmotic flow-driven system has great potential in a highly efficient separation system. Here, we packed capillary columns using a gravity method with synthesized nanoscale C18-SiO2 particles having diameters of 300–900 nm. The separation of small molecules and proteins was evaluated in the packed columns on a pressu

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16

Long, Wenwen, Mingyue You, Jieli Li, et al. "Sulfonic Functionalized Polydopamine Coatings with pH-Independent Surface Charge for Optimizing Capillary Electrophoretic Separations." Molecules 29, no. 7 (2024): 1600. http://dx.doi.org/10.3390/molecules29071600.

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Enhancing the pH-independence and controlling the magnitude of electroosmotic flow (EOF) are critical for highly efficient and reproducible capillary electrophoresis (CE) separations. Herein, we present a novel capillary modification method utilizing sulfonated periodate-induced polydopamine (SPD) coating to achieve pH-independent and highly reproducible cathodic EOF in CE. The SPD-coated capillaries were obtained through post-sulfonation treatment of periodate-induced PDA (PDA-SP) coatings adhered on the capillary inner surface. The successful immobilization of the SPD coating and the substan

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17

Lhotská, Ivona, Petr Solich, and Dalibor Šatínský. "A Comparative Study of Advanced Stationary Phases for Fast Liquid Chromatography Separation of Synthetic Food Colorants." Molecules 23, no. 12 (2018): 3335. http://dx.doi.org/10.3390/molecules23123335.

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Food analysis demands fast methods for routine control and high throughput of samples. Chromatographic separation enables simultaneous determination of numerous compounds in complex matrices, several approaches increasing separation efficiency and speed of analysis were involved. In this work, modern types of column with monolithic rod or superficially porous particles were employed and compared for determination of eight synthetic food dyes, their chromatographic performance was evaluated. During method optimization, cyano stationary phase Chromolith Performance CN 100 × 4.6 mm and Ascentis E

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18

Rambabu, K., L. Muruganandam, and S. Velu. "CFD Simulation for Separation of Carbon Dioxide-Methane Mixture by Pressure Swing Adsorption." International Journal of Chemical Engineering 2014 (2014): 1–7. http://dx.doi.org/10.1155/2014/402756.

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A developing technology for gas separations is pressure swing adsorption, which has been proven to be more economical and energy efficient compared to other separation methods like cryogenic distillation and membrane separation. A pressure swing adsorption (PSA) column, with carbon dioxide-methane as feed mixture and 6-FDA based polyimides as the adsorbent, was modeled and simulated in this work. Ansys Fluent 12.1, along with supplementary user defined functions, was used to develop a 2D transient Eulerian laminar viscous flow model for the PSA column. The model was validated by comparing the

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19

Walter, Thomas H., Bonnie A. Alden, and Kenneth Berthelette. "Evaluation of the Base Stability of Hydrophilic Interaction Chromatography Columns Packed with Silica or Ethylene-Bridged Hybrid Particles." Separations 9, no. 6 (2022): 146. http://dx.doi.org/10.3390/separations9060146.

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Stability as a function of mobile phase pH is an important consideration when selecting a chromatographic column. While the pH stability of reversed-phase columns is widely studied, there are relatively few reports of the stability of hydrophilic interaction chromatography (HILIC) columns. We evaluated the stability of silica and ethylene-bridged hybrid HILIC columns when used with mobile phases containing basic buffers. The predominant mode of column degradation observed in our studies was a decrease in efficiency due to voiding, resulting from the hydrolysis of the silica particles. Associat

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20

Kiran, Gaikwad*1 Vishal Madankar2. "Ultra Performance Liquid Chromatography (Uplc): A New Trend in Analysis." International Journal of Scientific Research and Technology 2, no. 3 (2025): 458–67. https://doi.org/10.5281/zenodo.15082659.

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Ultra Performance Liquid Chromatography (UPLC) is a modern analytical technique widely utilized in analytical chemistry and the pharmaceutical sector. It operates on the principles of column chromatography, which is typically employed to analyze mixtures. UPLC offers innovative advancements in liquid chromatography, allowing for shorter columns, reduced analysis time, and lower solvent usage. By utilizing particles smaller than 2µm, it significantly improves the speed, resolution, and sensitivity of analyses. Ultra Performance Liquid Chromatography (UPLC) leverages advancements in partic

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Abbass, Nourhan A., Khairy Elsayed, Abdelrady O. Elnady, and Yasser I. Elshaer. "CFD Study of Novel Vortex Finder Pressure Drop Holes to Enhance Cyclone Separators Performance." Journal of Physics: Conference Series 2811, no. 1 (2024): 012006. http://dx.doi.org/10.1088/1742-6596/2811/1/012006.

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Abstract Gas cyclones are widely employed for the removal of dust and suspended particles from gases, but they encounter challenges related to pressure drop (ΔP) and separation efficiency (ηSep). In addressing these issues, this study explores the impact of incorporating vortex finder pressure drop holes (VFPDH) in various configurations—single column, double columns, three columns, and four columns of holes—each column containing 15 holes. These holes are positioned equally distributed in clockwise order in the z-y plane starting from positive z to negative y-axis equally distributed. Computa

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Ratanatamskul, C., C. Chiemchaisri, and K. Yamamoto. "The use of a zeolite-iron column for residual ammonia and phosphorus removal in the effluent from a membrane process as an on-site small-scale domestic wastewater treatment." Water Science and Technology 31, no. 9 (1995): 145–52. http://dx.doi.org/10.2166/wst.1995.0354.

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Laboratory-scale experiments were performed to investigate the performance of the on-site small-scale combined system of membrane separation bioreactor (MSB) and zeolite-iron (Z-Fe) column. Average nitrogen removal by the membrane separation bioreactor was varied from 83% at an influent nitrogen concentration of 30 mg/l to 50% at 75 mg/l. Residual ammonia nitrogen in the effluent from the membrane separation bioreactor was further polished by a Z-Fe column to an initially non-detectable concentration and finally to 1.2 mg/l. The average phosphorus removal by this column unit was 70%. Improveme

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Brahim, Ahmed Ould, and Souad Abderafi. "Energy Efficiency Improvement of Debutanizer Column, for NGL Separation." International Journal of Environmental Science and Development 12, no. 9 (2021): 255–60. http://dx.doi.org/10.18178/ijesd.2021.12.9.1348.

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Compared to other petroleum, the natural gas combustion remains the cleanest and the one showing less CO2 emission. These reasons make the natural gas combustion one of the important issues to study. The separation of NGL is energy intensive. This operation is performed through a series of column including the debutanizer column. The present work is devoted to optimize the energy consumption at the level of the debutanizer column. The response surface technique and deploying a central composite numerical design is followed makes use of available data from a refinery. Using a multiple linear re

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Xu, Hongxiang, Jiongtian Liu, Yongtian Wang, Gan Cheng, Xiaowei Deng, and Xiaobing Li. "Oil removing efficiency in oil–water separation flotation column." Desalination and Water Treatment 53, no. 9 (2014): 2456–63. http://dx.doi.org/10.1080/19443994.2014.908413.

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Hamayun, Muhammad Haris, Naveed Ramzan, Murid Hussain, and Muhammad Faheem. "Evaluation of Two-Column Air Separation Processes Based on Exergy Analysis." Energies 13, no. 23 (2020): 6361. http://dx.doi.org/10.3390/en13236361.

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Cryogenic air separation processes are widely used for the large-scale production of nitrogen and oxygen. The most widely used design for this process involves two distillation columns operating at different pressures. This work focuses on the selection of suitable cryogenic air separation process by evaluating seven alternative designs of the two-column air separation process based on detailed exergy analysis. The feed conditions (500 tons/h, and 50% relative humidity of air), product purities (99 mole% for both nitrogen and oxygen), and operational conditions (pressures of both distillation

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26

Karaivanova, Mariana. "STUDY OF THE EFFICIENCY OF SEPARATION BY RECTIFICATION IN A LABORATORY COLUMN." International Journal of Advanced Research 10, no. 10 (2022): 808–13. http://dx.doi.org/10.21474/ijar01/15549.

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Rectification is one of the most complex energy and metal-intensive chemical and technological processes that have a strong influence on the quality of commodity products, the economy and ecology of production. It is a major process in the petrochemical and oil processing industries and its main apparatuses, rectification columns, are part of common technologies that have many interrelated parameters. The current environmental problems and requirements for the quality of commodity products are increasing and call for improvement of the resolution of rectification installations through their re

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27

Abou-El-Wafa, Moustafa H. M., Hesham Mansour, and G. A. Noubi. "High-performance liquid chromatography of some bis(ethylenediamine)cobalt(III) complexes." Canadian Journal of Chemistry 64, no. 10 (1986): 1953–56. http://dx.doi.org/10.1139/v86-322.

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Chromatographic separation of the complexes cis- and trans-Co(en)2(S2O3)2−, cis- and trans-Co(en)2(SO3)2−, cis- and trans-Co(en)2Cl2+,cis-Co(en)2(N3)2+, cis-Co(en)2(SO3)(N3)0, Co(en)2(S2O3)(N3)0, and Co(en)2(S2O3)(OH2)+ (en = ethylenediamine) was carried out by high-performance liquid chromatography. Good separations were achieved on a μ-Bondapak C18 reversed-phase octadecyldimethylsilane (ODS) column using tributylmethylammonium cations and octylsulphonate anions. The efficiency and speed of the separations were superior to those obtained on a Partisil SCX ion exchange column.

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Efimenko, A. P., I. I. Naumenko, E. V. Kirillova, and A. A. Shorokhov. "Selection of the parameters of a multicapillary column for portable gas analyzers by Kovach indices." Аналитика и контроль 26, no. 1 (2022): 49–56. http://dx.doi.org/10.15826/analitika.2022.26.1.003.

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Short straight multicapillary columns (MCC) allow for fast gas chromatographic separation. However, their limited efficiency makes it difficult to use them for the analysis of multicomponent mixtures. Therefore, it is important to preliminarily evaluate the possibility of separation of target substances, based on the available information about their characteristics, in particular, by retention indices (RI). The paper provides an example of the choice of MCC and chromatographic conditions for the separation of explosives in stationary phases OV-5 and SE-54. To find the correspondence of the re

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Zhang, Xu, Sixiang Zhang, Wei Zhou, and Yang Qi. "The Effect Analysis of Carrier Gas Flow Rate on the Rapid Gas Chromatographic Separation System." Applied Bionics and Biomechanics 2020 (November 6, 2020): 1–5. http://dx.doi.org/10.1155/2020/8886609.

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Odor pollution did not only disturb the human normal life but also aroused the attention of environmental researchers and environmental protection departments. Therefore, the research on odor detecting method and instrument is important to theory and application. On this basis, the self-developed microfluidic chip capillary column is used in our odor detecting system. In this paper, lead the chip column into the chromatography separation system, with its small size, high efficiency, easy integration, and other characteristics to replace the original traditional column. The chip column was used

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Xia, Hongjun, Huaiming Wang, Jianshan Wang, Lin Wang, Lin Jin, and Quan Bai. "Preparation of Core–Shell Silica Microspheres with Controllable Shell Thickness for Fast High Performance Liquid Chromatography Separation of Alkyl Benzenes and Intact Proteins." Journal of Biomedical Nanotechnology 17, no. 3 (2021): 439–46. http://dx.doi.org/10.1166/jbn.2021.3042.

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As it is difficult to prevent secondary nucleation and agglomeration during the preparation of core–shell silica microspheres, these issues have been successfully resolved in this study using template-dissolution-induced redeposition. The non-porous particles are transformed into core–shell silica microspheres (CSSMs) in the presence of cetyltrimethylammonium bromide and octyltrimethylammonium bromide under basic conditions. The shell thickness and pore sizes of the CSSMs are controlled by adjusting the etching time and molar ratio of the template, respectively. The CSSMs are modified using oc

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Santos, Natalia G. P., Deyber A. V. Medina, and Fernando M. Lanças. "Development of Wall-Coated Open Tubular Columns and Their Application to Nano Liquid Chromatography Coupled to Tandem Mass Spectrometry." Molecules 28, no. 13 (2023): 5103. http://dx.doi.org/10.3390/molecules28135103.

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This work presents a study on the application of wall open tubular column (WCOT) in liquid chromatography coupled with tandem mass spectrometry. Each process step reports the column preparation method in detail, subdivided into column pretreatment, silanization, stationary phase coating, and immobilization. Then, an evaluation of the parameters that can affect the efficiency of these columns was made. Atrazine, clomazone, and metolachlor were used as probes during this step. Factors such as stationary phase composition, length, internal diameter, stationary phase mass employed, and injection v

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Aqel, Ahmad, Munir Obbed, Ayman A. Ghfar, Kareem Yusuf, Ameen M. Alsubhi, and Ahmed Badjah-Hadj-Ahmed. "Naturally Occurring Montmorillonite-Based Polymer Monolith Composites as Stationary Phases for Capillary Liquid and Gas Chromatography." Separations 9, no. 12 (2022): 389. http://dx.doi.org/10.3390/separations9120389.

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This work is associated with the preparation of capillary chromatographic columns containing inorganic-organic composites comprised of naturally occurring montmorillonite (MMT) clay mineral and polymethacrylate monolithic material. The prepared composites combine the best qualities of both constituents, offering desirable properties for use under the disparate conditions of both GC and HPLC at the same time. The stationary phases were investigated by scanning electron microscopy (SEM), the specific surface area, and thermogravimetric analysis (TGA) and examined in terms of various conditions u

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Kukharova, Tatyana, Alexander Martirosyan, Mir-Amal Asadulagi, and Yury Ilyushin. "Development of the Separation Column’s Temperature Field Monitoring System." Energies 17, no. 20 (2024): 5175. http://dx.doi.org/10.3390/en17205175.

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Oil is one of the main resources used by all countries in the world. The ever-growing demand for oil and oil products forces oil companies to increase production and refining. In order to increase net profit, oil producing companies are constantly upgrading equipment, improving oil production technologies, and preparing oil for further processing. When considering the elements of primary oil refining in difficult conditions, such as hard-to-reach or in remote locations, developers face strict limitations in energy resources and dimensions. Therefore, the use of traditional systems causes a num

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Brezovska, Katerina, Gabriela Petrovska, Jelena Acevska, et al. "Transfer of pharmacopoeial liquid chromatography reversedphase methods for determination of related compounds in diclofenac sodium and metamizole sodium from conventional to core-shell column." Macedonian Pharmaceutical Bulletin 61, no. 01 (2015): 13–18. http://dx.doi.org/10.33320/maced.pharm.bull.2015.61.01.003.

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Core-shell silica particles were developed as a new material for chromatographic stationary phases in order to provide fast and high efficiency separations of small and large molecules and complex samples, at pressures compatible with conventional HPLC equipment. The aim of our work was to show the applicability of the HPLC columns based on a core-shell technology for determination of related substances in diclofenac sodium and in metamizole sodium using the methods described in the corresponding monographs of the European pharmacopoeia. The obtained results have shown that the proposed method

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Petruczynik, Anna. "Analysis of alkaloids from different chemical groups by different liquid chromatography methods." Open Chemistry 10, no. 3 (2012): 802–35. http://dx.doi.org/10.2478/s11532-012-0037-y.

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AbstractAlkaloids are biologically active compounds widely used as pharmaceuticals and synthesised as secondary methabolites in plants. Many of these compounds are strongly toxic. Therefore, they are often subject of scientific interests and analysis. Since alkaloids — basic compounds appear in aqueous solutions as ionized and unionized forms, they are difficult for chromatographic separation for peak tailing, poor systems efficiency, poor separation and poor column-to-column reproducibility. For this reason it is necessity searching of more suitable chromatographic systems for analysis of the

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Urbańska, Magdalena. "Optimization of Liquid Crystalline Mixtures Enantioseparation on Polysaccharide-Based Chiral Stationary Phases by Reversed-Phase Chiral Liquid Chromatography." International Journal of Molecular Sciences 25, no. 12 (2024): 6477. http://dx.doi.org/10.3390/ijms25126477.

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Enantioseparation of nineteen liquid crystalline racemic mixtures obtained based on (R,S)-2-octanol was studied in reversed-phase mode on an amylose tris(3-chloro-5-methylphenylcarbamate) (ReproSil Chiral-MIG) and a cellulose tris(3,5-dichlorophenylcarbamate) (ReproSil Chiral-MIC). These polysaccharide-based chiral stationary phase (CSP) columns for High-Performance Liquid Chromatography (HPLC) were highly effective in recognizing isomers of minor structural differences. The mobile phase (MP), which consists of acetonitrile (ACN)/water (H2O) at different volume ratios, was used. The mobile pha

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Javed, Areej, Afaq Hassan, Muhammad Babar, et al. "A Comparison of the Exergy Efficiencies of Various Heat-Integrated Distillation Columns." Energies 15, no. 18 (2022): 6498. http://dx.doi.org/10.3390/en15186498.

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Distillation has relatively low thermodynamic efficiency, so it is a prime target for process intensification studies. The current research aims to study exergy losses in various heat-integrated distillation columns. A conventional industrial-scale i-butane/n-butane fractionator has been selected as a case study for the comparison of the performances of various heat-integrated designs. The Aspen Plus® process simulator is used to perform steady-state simulations and exergy analyses of the conventional distillation column (CDC), internally heat-integrated distillation column (iHIDiC), externall

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Huang, Gen, Hongxiang Xu, Lun Wu, Xiaobing Li, and Yongtian Wang. "Research of novel process route and scale-up based on oil-water separation flotation column." Journal of Water Reuse and Desalination 8, no. 1 (2017): 111–22. http://dx.doi.org/10.2166/wrd.2017.090.

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Abstract A novel process ‘coalescence-airflotation-carrier preferential adsorption’ utilising an oil-water separation flotation column with a unique structure was used in the oil-water separation field. The oil-water separation flotation column contains the cyclonic separation and airflotation separation which has advantages in oily sewage treatment, especially in polymer-flooding-drive oily sewage treatment. In this paper, different dimensions of flotation column with 1 m3 d−1, 30 m3 d−1 and 2,000 m3 d−1 oil-water separation systems were investigated. In addition, several operating parameters

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Ränger, Lena-Marie, Yannick Waibel, and Thomas Grützner. "Experimental Investigation of Heat Losses in a Pilot-Scale Multiple Dividing Wall Distillation Column with Three Parallel Sections." ChemEngineering 7, no. 4 (2023): 68. http://dx.doi.org/10.3390/chemengineering7040068.

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For an in-depth investigation of the separation process in small-scale distillation columns, knowledge about the exact vapor load inside the column is highly important. However, since columns with small diameters have a comparatively high surface-to-volume ratio, heat losses have a significant impact on fluid dynamics, as they lead to unwanted condensation, and thus, to changes in the internal flows. This work presents a procedure used to measure heat losses in a 9.6 m high distillation column with three partially parallel segments (multiple dividing wall column). The evaporator is made of sta

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Dong, Ming, and Qiong Fang Shao. "Study on Control Technique in Flocculating Separation Process of Fermentation Broth." Advanced Materials Research 781-784 (September 2013): 1875–80. http://dx.doi.org/10.4028/www.scientific.net/amr.781-784.1875.

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For reforming jar testing and increasing separation efficiency, separation technology of fermentation broth was studied by controlling the process of flocculation. The tried new system to be operated continuously was composed of the processes of transporting fermentation broth, flocculating the broth and separating the one. The experimental course of controlling the process of flocculation was as follows: the broth was conveyed by a pump and pipeline from fermentation pot to a mixer in which a flocculant and the broth were mixed, afterward the broth flowing from the mixer was flocculated conti

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Panfilov, Nikita, and Ivan Semenov. "INCREASING THE COMPLETENESS OF PENTANE SEPARATION FROM NAPHTHA BY IMPROVING THE SEPARATION ACCURACY IN THE LIGHT NAPHTHA ISOMERIZATION TECHNOLOGY." Modern Technologies and Scientific and Technological Progress 1, no. 1 (2021): 66–67. http://dx.doi.org/10.36629/2686-9896-2021-1-1-66-67.

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The application of a dividing wall column for the separation of isomerization feed  was considered. It will increase the quality of separation of the raw mixture and the efficiency of the  plant.

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Zhang, Ping, Yuhan He, Sheng Wang, et al. "Chiral Separation and Determination of Etoxazole Enantiomers in Vegetables by Normal-Phase and Reverse-Phase High Performance Liquid Chromatography." Molecules 25, no. 14 (2020): 3134. http://dx.doi.org/10.3390/molecules25143134.

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The chiral separation of etoxazole enantiomers on Lux Cellulose-1, Lux Cellulose-3, Chiralpak IC, and Chiralpak AD chiral columns was carefully investigated by normal-phase high performance liquid chromatography and reverse-phase high performance liquid chromatography (HPLC). Hexane/isopropanol, hexane/n-butanol, methanol/water, and acetonitrile/water were used as mobile phase at a flow rate of 0.8 mL/min. The effects of chiral stationary phase, mobile phase component, mobile phase ratio, and temperature on etoxazole separation were also studied. Etoxazole enantiomers were baseline separated o

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Walter, Thomas H., Cheryl Boissel, Jessica A. Field, and Nicole L. Lawrence. "Further Evaluation of the Base Stability of Hydrophilic Interaction Chromatography Columns Packed with Silica or Ethylene-Bridged Hybrid Particles." Separations 10, no. 3 (2023): 175. http://dx.doi.org/10.3390/separations10030175.

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One of the fundamental attributes of a liquid chromatography column is its stability when exposed to acidic and basic mobile phases. However, there have been relatively few reports to date on the stability of hydrophilic interaction chromatography (HILIC) columns. Here, we report the results of stability evaluations carried out for HILIC columns packed with ethylene-bridged hybrid or silica particles using accelerated conditions, employing a 100% aqueous pH 11.3 ammonium bicarbonate mobile phase at 70 °C. Under these conditions, the primary mode of column failure was a loss of efficiency due t

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Farzaliyev, V. M., and M. N. Aliyeva. "Effect of column efficiency on separation of organic compounds in vapor-phase chromatography." Azerbaijan Oil Industry, no. 10 (October 15, 2021): 38–42. http://dx.doi.org/10.37474/0365-8554/2021-10-38-42.

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Comparative analysis on the efficiency of separation of sequence of organic compounds via chromatography specifying the height equivalent to the theoretical plates has been carried out. Alongside with inert gas (nitrogen), water steam has been used as a mobile phase as well. It is shown that in the zones of low speed of mobile phase, the column efficiency slightly depends on the nature of applied carrier. Using water steam as a mobile phase instead of nitrogen in high speed allows increasing separation efficiency for 1.2-1.8 times. Moreover, the best results are observed when water steam is us

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Sun, Lan Yi, Jun Li, Xue Nuan Liu, and Qing Song Li. "Reducing Energy Consumption in Propylene-Propane Separation with Heat Coupled Distillation." Advanced Materials Research 225-226 (April 2011): 500–503. http://dx.doi.org/10.4028/www.scientific.net/amr.225-226.500.

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The heat coupled distillation column which applies the principle of internal heat integration between the rectifying section and the stripping section of a distillation column by increasing the temperature of the rectifying section with a compressor attracts extensive attention worldwide for its high thermodynamic efficiency. In this study, the economic features of a heat coupled distillation column (HCDC) are investigated and compared to a conventional column and a commercial column with vapor recompression system (VRC) for the separation of propylene-propane mixture. The economic analysis in

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Anokhina, E. А., I. M. Gracheva, A. Yu Akishin, and А. V. Timoshenko. "ACETONE-CHLOROFORM-n-BUTANOL MIXTURE SEPARATION BY THE EXTRACTIVE DISTILLATION IN SCHEMES OF TWO-OUTLET COLUMNS." Fine Chemical Technologies 12, no. 5 (2017): 34–46. http://dx.doi.org/10.32362/2410-6593-2017-12-5-34-46.

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Extractive distillation of acetone-chloroform-n-butanol mixture with dimethylformamide in two-outlet column schemes is considered. Optimal parameters according to the total energy consumption criterion in the column boilers of the three extractive distillation schemes for this mixture separation are determined. Calculations were carried out in a design-verification version at 1000 kg/hr of the initial mixture with the concentrations of acetone, chloroform and n-butanol 71.3, 14.7 and 14.0% wt., respectively. Dimethylformamide concentration in the entrainer flow was set to 99.99 wt%. The main c

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Efimenko, A. P., I. I. Naumenko, V. K. Soboleva, and M. N. Baldin. "Application of multicapillary columns for the fast separation of BTEX aromatic hydrocarbons from ambient air samples." Аналитика и контроль 29, no. 1 (2025): 75–82. https://doi.org/10.15826/analitika.2025.29.1.005.

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Air pollution affects public health and the environment, and must be controlled. Measurement of the spatial distribution of pollutants by a mobile laboratory requires fast response of the analytical instruments used. Optical methods of detecting nitrogen oxides, suspended particles, ozone, sulfur dioxide and carbon monoxide in the air allow performing up to 10 measurements per second. Determination of the content of aromatic hydrocarbons (benzene, toluene, ethylbenzene and xylenes, collectively designated as BTEX) is carried out by mass spectrometry and gas chromatography. However, a mass spec

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Jamshaid, Tahir, Khalid Sajjad Feras, Majed Musalim Albluwi, and Abid Hussain. "Optimization and Evaluation of Column Efficiency in RP-HPLC Method for Pharmaceutical and Forensic Drug Analysis." Arab Journal of Forensic Sciences and Forensic Medicine 6, Special Issue (2024): 165–74. http://dx.doi.org/10.26735/ikrk2529.

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Reverse Phase High Performance Liquid Chromatography (RP-HPLC) is an efficient and reliable technique employed in pharmaceutical and forensic analysis. The assay determination in pharmaceutical and certain molecular detection is performed using this technique. Performance of chromatographic columns play a central role in development of more efficient separation methods. It is one of the main component of system suitability testing in a chromatographic system. The column efficiency can be assessed by using various traditional methods and reproducible results can be evaluated using liquid chroma

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Ji, Jun, Yi Gang Ding, Lei Liu, Li Wei Wang, and Yuan Xin Wu. "Effect of Bias Flow on Flotation Efficiency in a Packed Column." Advanced Materials Research 781-784 (September 2013): 2797–802. http://dx.doi.org/10.4028/www.scientific.net/amr.781-784.2797.

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Bias flow is an important parameter in a flotation process of packed column. An experiment related to P2O5 recovery of phosphate rock was designed to study the effect of bias flow on the flotation separation efficiency by a direct-reverse flotation circuit of packed flotation column. The results have showed that the recovery of P2O5 is high during the combination of the direct-reverse flotation circuit. The grade and yield of P2O5 can reach to 32.77% and 82.64% respectively, under the condition of the range of-0.005~0 cms-1 of bias flow, 0.013~0.020 cms-1 of the wash water flow rate in the dir

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Mohapatro, Rudra Narayan, Ranjita Swain, Sunita Routray, Biswa Ranjan Patra, and Prabhakar Sethi. "Separation Efficiency Optimisation of Toluene–Benzene Fraction using Binary Distillation Column." Journal of The Institution of Engineers (India): Series D 102, no. 1 (2021): 125–29. http://dx.doi.org/10.1007/s40033-021-00261-6.

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