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Dissertations / Theses on the topic 'Packed columns'

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Published: 4 June 2021

Last updated: 25 July 2025

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1

蔡燦茂 and Tsan-mau Choi. "Flow and mixing in packed columns." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1996. http://hub.hku.hk/bib/B31214034.

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2

Wilson, William Henry. "Packed capillary columns for liquid chromatography." Diss., Virginia Tech, 1990. http://hdl.handle.net/10919/37746.

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3

Ali, Syed Aftab. "Semi-Packed Micro Gas Chromatography Columns." Thesis, Virginia Tech, 2008. http://hdl.handle.net/10919/35201.

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Separation of complex gaseous mixtures using gas chromatography (GC) is an important step in analytical systems for environmental monitoring, medical diagnosis, and forensic science. Due to its high resolving power, analysis speed, and small sample size, GC, has become the premier technique for separation and analysis of volatile and semi-volatile organic compounds. Miniaturization of analytical systems has become a major trend which is mainly driven by advancements in microfabrication techniques and a need for portable lab-on-a-chip systems for onsite monitoring. Microfabricated columns have

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4

Choi, Tsan-mau. "Flow and mixing in packed columns /." Hong Kong : University of Hong Kong, 1996. http://sunzi.lib.hku.hk/hkuto/record.jsp?B17389872.

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5

Eeltink, Sebastiaan. "Packed and monolithic capillary columns for LC." [S.l. : Amsterdam : s.n.] ; Universiteit van Amsterdam [Host], 2005. http://dare.uva.nl/document/79351.

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6

Hapoglu, H. "Self-tuning control of packed distillation columns." Thesis, Swansea University, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.637219.

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The steady-state and dynamic behaviour of multicomponent packed distillation columns has been simulated using two film plug flow and back-mixing models. The model solutions have been obtained employing orthogonal collocation on finite elements. The use of Jacobi, Legendre or Hermite polynomials within the finite element procedure are compared with an approach employing the Galerkin criterion. Results from the three polynomial procedures are very similar. However, in cases where more than three collocation points are required the incorporation of cubic Hermite polynomials gave the most efficien

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7

Malkin, Douglas Scott, and Douglas Scott Malkin. "An Investigation of a Novel Monolithic Chromatography Column, Silica Colloidal Crystal Packed Columns." Diss., The University of Arizona, 2010. http://hdl.handle.net/10150/193936.

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Many researchers have investigated ways to improve the separation power of conventional chromatography, most notable is the development of ultra-high performance liquid chromatography (UHPLC). However, only slight improvements in separation efficiency have been achieved up to this point, and unfortunately, modern reversed phase liquid chromatography (RPLC) methods do not have high enough resolving power to analyze complex proteomic mixtures.Uniformly sized silica particles from 10 nm to 1 micron are known to self-assemble into a highly ordered face centered cubic crystal. Silica colloidal crys

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8

Ryuk, Jinwhan. "The performance of distribution systems in packed columns." Thesis, University of Bristol, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.399861.

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9

Chan, Ryan. "Density Modulated Semi-Packed Micro Gas Chromatography Columns." Thesis, Virginia Tech, 2018. http://hdl.handle.net/10919/83448.

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With the continued evolution of MEMS-based gas chromatography, the drive to develop new standalone systems with lower power consumptions and higher portability has increased. However, with improvements come tradeoffs, and trying to reduce the pressure drop requirements of previously reported semi-packed columns causes a significant sacrifice in separation efficiency. This thesis covers the techniques for evaluating the separation column in a gas chromatography system as well as the important parameters that have the most effect on a column’s efficiency. Ionic liquids are introduced as a stable

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10

Ashraf-Khorassani, Medhi. "Supercritical fluid chromatography of nitrogen-containing compounds on packed columns." Diss., Virginia Polytechnic Institute and State University, 1988. http://hdl.handle.net/10919/49919.

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The separation of basic nitrogen-containing compounds has been investigated via supercritical CO₂ and 1% methanol modified CO₂. Packed columns with the following stationary phases were employed: silica, octadecyl (C₁₈), propylamino (NH₂), and polystyrene-divinyl benzene (PRP). Without modifier the range of basicities which could be eluted increased in the order of silica < PRP < C₁₈ = NH₂. Chromatographic peak shapes and selectivity were much better with propylamino column. Different aromatic amines and azaarenes were successfully separated on both analytical scale and microbore propylamino bo

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11

Yin, Fuhe. "Liquid maldistribution and mass transfer efficiency in randomly packed distillation columns." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0015/NQ46953.pdf.

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12

Shagena, Elizabeth C. "Comparison of packed and wide-bore, open-tubular gas chromatographic columns." Thesis, Virginia Tech, 1987. http://hdl.handle.net/10919/45896.

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<p>Wide-bore, fused-silica capillary columns can be an excellent replacement for packed columns in many cases. They can provide higher surface inertness and thermal stability, as well as higher efficiency or speed of analysis. Wide-bore, open-tubular (WBOT) columns with thick films have higher sample capacities than conventional narrow-bore capillary columns and can be used in unmodified packed-column gas chromatographs.</p><p> The majority of gas chromatographic analyses are still performed using packed columns. Many chromatographers associate open-tubular columns exclusively with sp

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13

Meng, Xuewei. "Flow Through, 2D/3D Nanoplatelet Supports for Packed Beds and Columns." Thesis, Université d'Ottawa / University of Ottawa, 2018. http://hdl.handle.net/10393/38445.

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High performance catalyst supports and packing materials are playing an increasing role in many reactions and separations. The dispersion in packed bed reactors and separation columns can be reduced by the development of new packing structures having open and connected pore geometries. The application of new materials in High Performance Liquid Chromatography (HPLC) with sub 5 micron particle sizes are growing. These small particles offer better performance and improved bed and column efficiencies. Recently developed, twinned Alumina Nanosheets (TAN) are 2D/3D nanomaterials that offer promisin

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14

Lamprecht, Sarel Marais. "Establishing a facility to measure packed column hydrodynamics." Thesis, Stellenbosch : University of Stellenbosch, 2010. http://hdl.handle.net/10019.1/5257.

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Thesis (MScEng (Process Engineering))--University of Stellenbosch, 2010.<br>ENGLISH ABSTRACT: Distillation continues to be the most widely used method of separation in the processing industry, in spite of its inherently low thermodynamic efficiency. Two of the critical distillation research needs that arose from the US-Initiative Vision 2020 were to develop a better understanding of the physical phenomena as well as developing better predictive models. Also, characterisation of modern packing materials is required to assist in the CO2 capture optimisation. This thesis deals with both the

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15

Noor, Samsul Bahari Mohd. "Development of an optimal adaptive control technique for distillation and chemical processes based on analytical models." Thesis, University of Sheffield, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.267118.

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16

Chang, Y. C. "Practical investigation on the hydrodynamic behaviour of chromatographic columns packed with compressible media." Thesis, University College London (University of London), 2011. http://discovery.ucl.ac.uk/1324521/.

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Chromatography is an integral part of downstream processes to enable highly selective separation of biopharmaceutical products. A relatively high portion of total production costs are associated with the chromatography stage, hence optimisation of this unit operation is desirable. In this thesis column hydrodynamics were investigated under different operating conditions to provide an understanding of the effect of the column and matrix properties on the maximum flow velocity that the column is capable of being operate1at, the so called critical velocity, ucrit. Two automated methods for locati

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17

Hardey, Marriann. "Separation of neautral, acid and basic compounds on open tubular and packed capillary columns." Thesis, University of York, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.489265.

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18

Uhl, Petra Ursula. "Separation of neautral,acid and basic compounds on open tubular and packed capillary columns." Thesis, University of Strathclyde, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.488631.

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19

Theron, William George Joseph. "Numerical analysis of the flow distribution within packed columns using an explicit approach / Theron W.G.J." Thesis, North-West University, 2011. http://hdl.handle.net/10394/8212.

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Existing correlations developed to account for pressure drop and velocity distribution in packed beds are not ideal for beds with low aspect ratios. This study investigated a method to model flow distribution through packed columns by performing numerical analysis using an explicit approach. Fixed random packed beds for column–to–sphere diameter ratios of 1.39<br>Thesis (M.Ing. (Nuclear Engineering))--North-West University, Potchefstroom Campus, 2012.

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20

Cesur, Serap. "Study of modelling, simulation and different operation modes and control for packed batch distillation columns." Thesis, University of Bath, 1993. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.332843.

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21

Ceylan, Hatice. "Control And Simulation Studies For A Multicomponent Batch Packed Distillation Column." Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/12608688/index.pdf.

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During the last decades, batch distillation is preferably used with an increasing demand over continuous one, to separate fine chemicals in chemical and petroleum industries, due to its advantages like, flexibility and high product purity. Consequently, packed distillation columns, with newly generated packing materials, are advantageous compared to plate columns because of their smaller holdups, resistivity to corrosive materials and their higher separation efficiencies. Also, in many industrial applications, mathematical models of distillation systems are frequently used in order to design e

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22

Borsatto, João Victor Basolli. "Colunas empacotadas em cromatografia líquida capilar: desenvolvimento de hardwares e avaliação de suas contribuições no desempenho cromatográfico." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/75/75135/tde-23102018-170956/.

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Essa dissertação de mestrado descreve o desenvolvimento de hardwares de colunas para cromatografia líquida capilar. O processo de desenvolvimentos desses dispositivos é descrito gradativamente e os pontos fortes e as limitações de cada modelo de hardware são discutidos. O melhor modelo de hardware desenvolvido apresentou produção simples, fácil conexão ao sistema cromatográfico e resistência a pressões superiores a 900 bar. Sucessivamente ao estabelecimento de um modelo de hardware apropriado, os efeitos dos materiais do hardware na eficiência das colunas foram avaliados. Poucos estudos relata

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23

Adem, Seid Muhie. "DEVELOPMENT AND CHARACTERIZATION OF STABILIZED PHOSPHOLIPID COATINGS FOR OPEN TUBULAR AND PACKED CAPILLARY SEPARATIONS." Diss., The University of Arizona, 2010. http://hdl.handle.net/10150/204067.

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Phosphorylcholine (PC) based phospholipid bilayers have been explored as coating materials for various substrates due to their inherent resistance to non-specific protein adsorption. Phospholipids have been used for coatings in capillary electrophoresis (CE) to suppress electroosmotic flow (EOF) and to obtain better separation of proteins. Here, a series of investigations geared towards developing highly stable phospholipid based biomimetic stationary phases for chromatographic separations was performed.Fluid phospholipid bilayers lack the desired chemical and physical stability to serve as lo

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24

Fang, Yan. "Pore Size Characterization of Monolithic Capillary Columns Using Capillary Flow Porometry." BYU ScholarsArchive, 2009. https://scholarsarchive.byu.edu/etd/2234.

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A simple capillary flow porometer (CFP) was assembled for pore structure characterization of monolithic capillary liquid chromatography columns based on ASTM standard F316-86. Determination of differential pressures and flow rates through dry and wet samples provided the necessary information to determine the through-pore throat diameter, bubble point pore diameter, mean flow pore diameter, and pore distribution. Unlike measurements in bulk using traditional techniques to provide indirect information about the pore properties of monolithic columns, monoliths can be characterized in their origi

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25

Wanjiya, Mwema. "Investigation of bacterial ferrous iron oxidation kinetics in a novel packed-column reactor: pH and jarosite management." Thesis, Cape Peninsula University of Technology, 2013. http://hdl.handle.net/20.500.11838/862.

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Thesis submitted in fulfilment of the requirements for the degree of Masters of Technology: Chemical Engineering in the Faculty of Engineering Cape Peninsula University of Technology, South Africa Supervisor: Prof TV Ojumu Cape Town Campus September 2013<br>Jarosite formation is regarded as undesirable in the bioleaching processes as it depletes ferric reagent; a critical reagent for the oxidation of most sulphide minerals, from bioleach solution. It creates kinetic barriers and clogs on mineral surfaces, thereby retarding leach rates of most minerals. However, jarosite has also been shown to

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26

Metzelder, Florian [Verfasser], and Torsten Claus [Akademischer Betreuer] Schmidt. "Investigation of sorption properties of carbon nanomaterials using packed columns and inverse liquid chromatography / Florian Metzelder ; Betreuer: Torsten Claus Schmidt." Duisburg, 2018. http://d-nb.info/1169572014/34.

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27

Koivisto, Pernilla. "Development of techniques and methods for drug analysis by packed capillary liquid chromatography with octadecylbonded silica and porous graphitic carbon columns." Doctoral thesis, Uppsala : Acta Universitatis Upsaliensis : Univ.-bibl. [distributör], 2001. http://publications.uu.se/theses/91-554-4920-4/.

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28

Dautriche, Bastien. "Développement d’un procédé de traitement industriel des eaux salées, chimie et génie du procédé." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLC030.

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Ce travail s’inscrit dans la convention CIFRE n°2012/0379 avec la startup Adionics pour le développement d’un procédé de dessalement par extraction liquide-liquide. La régénération de la phase organique est réalisée par désextraction du sel à chaud. Les isothermes de partage du NaCl, Na2SO4 et MgCl2 à 20 40 60 et 80°C ont été obtenues. Une stœchiométrie expliquant leur forme a été proposée et les constantes d’équilibre associées ont été déterminées. Les enthalpies d’extraction ont été déduites des variations des constantes d’équilibre avec la température.La prise en compte de l’effet de milieu

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29

Dai, Qiang. "Simulation of packed column jigging." Morgantown, W. Va. : [West Virginia University Libraries], 1999. http://etd.wvu.edu/templates/showETD.cfm?recnum=783.

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Thesis (M.S.)--West Virginia University, 1999.<br>Title from document title page. Document formatted into pages; contains xiii, 131 p. : ill. (some col.). Vita. Includes abstract. Includes bibliographical references (p. 61-64).

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30

Can, Özge Ülkü Semra. "Ion exchange in natural zeolite packed column/." [s.l.]: [s.n.], 2004. http://library.iyte.edu.tr/tezler/master/kimya/T000607.pdf.

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31

Suggs, James Alfred. "Generation of microbubble foam using a packed column." Thesis, This resource online, 1987. http://scholar.lib.vt.edu/theses/available/etd-04272010-020313/.

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32

Riddell, Nicole. "Packed Column Supercritical Fluid Chromatography : Applications in Environmental Chemistry." Doctoral thesis, Örebro universitet, Institutionen för naturvetenskap och teknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-56826.

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Although gas and liquid chromatography have emerged as dominant separation techniques in environmental analytical chemistry, these methods do not allow for the concurrent analysis of chemically diverse groups of persistent organic pollutants (POPs). There are also a small number of compounds which are not easily amenable to either of these traditional separation techniques. The main objective of this thesis was to address these issues by demonstrating the applicability of packed column supercritical fluid chromatography (pSFC) coupled to mass spectrometry (MS) in various aspects of environment

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33

Arrieta, Garay Yanine. "Influence of a packed distillation column on volatile composition and sensory profile of spirit drin." Doctoral thesis, Universitat Rovira i Virgili, 2014. http://hdl.handle.net/10803/284040.

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En aquesta tesis s’ha estudiat la possibilitat d’emprar un sistema de destil•lació discontinu que consisteix en una columna de rebliment, formada d’una malla de coure, que permet augmentar l’eficàcia de separació, tant de l’etanol com d’altres compostos volàtils de fermentats de fruites como de vinasses del sector vitivinícola. En el treball experimental aquest sistema s’ha comparat amb la destil•lació tradicional amb alambí tipus charantais construït en coure. Las matèries primeres emprades han estat fermentats de pera de tres varietats diferents (Blanquilla, Conferencia i Bartlett), fermenta

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34

Baker, S. A. "Liquid dispersion in two-phase flow in a packed column." Thesis, Swansea University, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.636015.

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This study presents the results of an investigation of liquid flow and dispersion in the bulk and wall region as well as liquid dispersion in the whole cross-section in a packed column with and without counter-current gas flow. In the study a column of 30 cm in diameter packed with 2.54 cm Rashig rings was used. Water was uniformly distributed at the top while air was introduced and distributed uniformly at the bottom of the packed column. Using a point injector, an input pulse of sodium choride solution was introduced at the axis of the column through a small diameter injection tube at a bed

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35

Tanner, Richard Kevin. "From maldistribution to mass transfer in a tilted packed column." Thesis, Heriot-Watt University, 1996. http://hdl.handle.net/10399/1087.

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36

Guzman, Francisco J. "Separation of Colloidal Particles in a Packed Column using Depletion Forces." Thesis, Virginia Tech, 2012. http://hdl.handle.net/10919/34831.

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Depletion forces were used to separate an equinumber density binary dispersion of 1.5 and 0.82 Âµm polystyrene sulfate (PS) particles. Experiments consisted of injecting a pulse of a binary dispersion of PS particles into the inlet of a packed bed of 0.5 mm silica collector beads. Prior to injection, a carrier fluid of either KCl and KOH electrolyte or a silica nanoparticle dispersion was flowing through the column at steady state. When the carrier fluid was a dispersion of silica nanoparticles, the ratio of PS particles in the column outlet would change from 1:1 big to small particles to slig

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37

Potters, Kimberlee. "Magnetic Resonance Imaging of columnar reactors." Thesis, University of Cambridge, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.336775.

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38

Hoffman, Brian Jeffrey. "Analysis of Alcohol and Alkylphenol Polyethers via Packed Column Supercritical Fluid Chromatography." Diss., Virginia Tech, 2004. http://hdl.handle.net/10919/11174.

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Alkylphenol ethoxylates (APEOs), alcohol ethoxylates (AEOs), and alcohol propoxylates (APOs) are non-ionic surfactants used in daily care products and detergents. They are formed as an oligomeric series with a varying distribution, which determines their commercial application. The goal of the research performed was the development of sample characterization methods for non-ionic surfactants utilizing supercritical fluid chromatography (SFC) under mild instrument operating conditions. The aryl group present in APEOs allowed ultraviolet (UV) detection, with an equal molar response for oligom

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39

Zame, Kenneth Kofiga. "Carbon Capture Using The Microalgae Chlorella Vulgaris in a Packed Bubble Column Photobioreactor." Youngstown State University / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=ysu1288578577.

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40

Bonariol, Francesco. "Sizing of a packed stripping tower for seawater injection process and H2S abatement on an FPSO." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020.

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The purpose of this working thesis is to study and analyze in depth the sea water injection unit found upon an FPSO. In particular, attention is focused on the vacuum deaeration column used for the degasification of the seawater stream in two stages: the first, with a lower vacuum degree and the second with a higher vacuum degree. Moreover, this thesis studies the mass transfer operation, carrying out a profound dissertation of the mass transport phenomena, introducing the mass transfer equations and coefficients. This study has been developed because it is desired to size another stripp

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41

Burdette, Diana Marguerite. "Interfacing packed column supercritical fluid chromatography with mass spectrometry using the particle beam interfaceBurdette." Thesis, Georgia Institute of Technology, 1995. http://hdl.handle.net/1853/27555.

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42

Nedungadi, Kishore. "On the performance of a liquid-liquid extraction column packed with Sulzer SMV static mixers /." [S.l.] : [s.n.], 1991. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=9406.

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43

Lacroix, Olivier. "CO₂ capture using immobilized carbonic anhydrase in Robinson-Mahoney basket and packed absorption column reactors." Master's thesis, Université Laval, 2008. http://www.theses.ulaval.ca/2008/25183/25183.pdf.

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Lacroix, Olivier. "CO2 Capture using immobilized carbonic anhydrase in Robinson-Mahoney basket and packed absorption column reactors." Thesis, Université Laval, 2008. http://www.theses.ulaval.ca/2008/25183/25183.pdf.

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45

Chukwuchendo, Emmanuel Chukwunonso. "Bio-oxidation of ferrous iron at low temperature conditions in a packed bed column bioreactors." Thesis, Cape Peninsula University of Technology, 2016. http://hdl.handle.net/20.500.11838/2545.

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Thesis (MTech (Chemical Engineering))--Cape Peninsula University of Technology, 2016.<br>The oxidation of microbial ferrous iron is an important sub-process in the bioleaching process. Several studies focussing on microbial ferrous iron oxidation have been investigated and reported in various studies. These studies were carried out using stirred tank bioreactors and shake flasks at optimum conditions. However, these studies could not describe the context of heap bioleach system. Packed column system may describe heap bioleaching, and most studies on microbial ferrous iron oxidation were perfor

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Strode, J. Thompson B. III. "Impact of modified carbon dioxide mobile phases on detection on packed-column supercritical fluid chromatography." Diss., Virginia Tech, 1995. http://hdl.handle.net/10919/38095.

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The advantages of supercritical fluid chromatography (SFC) and supercritical fluid extraction (SFE) which utilize supercritical fluids (SF) as the mobile phase are being realized by the scientific community. SF are more advantageous than traditionally used organic solvents because SF exhibits the solvating strength of liquids while maintaining the higher mass transport properties of gases. Currently, the most common SF which is CO₂ is available in two preparations of pure CO₂ and helium headspace CO₂. SFC of polyaromatic hydrocarbons (PAH) was performed with pure carbon dioxide and helium head

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47

LEE, SE HWAN. "Polymer Lab-on-a-Chip with Functional Nano/Micro Bead-Packed Column for Biochemical Analysis." University of Cincinnati / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1212166774.

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Strode, J. Thompson B. "Impact of modified carbon dioxide mobile phases on detection on packed-column supercritical fluid chromatography /." This resource online, 1995. http://scholar.lib.vt.edu/theses/available/etd-06062008-155212/.

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49

Sjöstrand, Filip, and Reza Yazdi. "Absorption of CO₂ : - by Ammonia." Thesis, Växjö University, School of Technology and Design, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:vxu:diva-5256.

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<p>In this diploma work, the absorption of CO<sub>2 </sub>in different liquid solutions was studied by gas absorption in a randomly packed column. To characterize the absorption a few experiments with SO<sub>2</sub> absorption were made.The report has resulted due to the large amounts of carbon dioxide released into the atmosphere, mainly from fossil-fired power plants. To reduce these emissions, carbon dioxide can be separated from flue gas by different techniques such as CO<sub>2</sub> absorption with ammonia. The work consists of a theoretical and a laboratory part of measurements and calcu

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Sjöstrand, Filip, and Reza Yazdi. "Absorption of CO2 : - by Ammonia." Thesis, Växjö universitet, Institutionen för teknik och design, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:vxu:diva-5256.

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In this diploma work, the absorption of CO2 in different liquid solutions was studied by gas absorption in a randomly packed column. To characterize the absorption a few experiments with SO2 absorption were made.The report has resulted due to the large amounts of carbon dioxide released into the atmosphere, mainly from fossil-fired power plants. To reduce these emissions, carbon dioxide can be separated from flue gas by different techniques such as CO2 absorption with ammonia. The work consists of a theoretical and a laboratory part of measurements and calculations. In the experimental part a

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