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Journal articles on the topic 'Kinetické procesy'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Wulan, Praswasti PDK, Widodo W. Purwanto, Yuswan Muharam, and Anindya Adiwardhana. "Parameter kinetika reaksi dekomposisi katalitik metana menjadi karbon nanotube dengan katalis Ni-Cu-Al." Jurnal Teknik Kimia Indonesia 11, no. 1 (2018): 34. http://dx.doi.org/10.5614/jtki.2012.11.1.5.

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Kinetic Parameter of Methane catalytic Decomposition Reaction into Nanotube Carbon with Ni-Cu-Al Catalyst. Development of production technology of nanotubes carbon through catalytic conversion of hydrocarbons will be efficient and effective if based on knowledge of the nucleation and growth mechanism of carbon nanotubes. Most of the research that focused on identifying the main products of reaction and estimate the activation energy. Growth kinetics and mechanism data of carbon nanotubes not completely available, so that process kinetics models are always based on experimental kinetic data. Th

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Dyachok, Vasil. "Extraction Process of Intracellular Substance." Chemistry and Chemical Technology 4, no. 2 (2010): 163–66. http://dx.doi.org/10.23939/chcht04.02.163.

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In this study the mathematical model of the extraction process from plant material is developed, taking into account the anatomical structure of plant material, namely the presence of cellular and intercellular spaces. The solution of the model enables to determine its kinetic coefficients Dc, Dt, process conditions, and predict the kinetics of the extraction process implementation in practice.

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Pustějovská, Pavlína, and Simona Jursová. "Process Engineering in Iron Production." Chemical and Process Engineering 34, no. 1 (2013): 63–76. http://dx.doi.org/10.2478/cpe-2013-0006.

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Abstract Balance, thermodynamic and mainly kinetic approaches using methods of process engineering enable to determine conditions under which iron technology can actually work in limiting technological states, at the lowest reachable fuel consumption (reducing factor) and the highest reachable productivity accordingly. Kinetic simulation can be also used for variant prognostic calculations. The paper deals with thermodynamics and kinetics of iron making process. It presents a kinetic model of iron oxide reduction in a low temperature area. In the experimental part it deals with testing of iron

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Fatmawati, Akbarningrum. "Model kinetika inhibisi substrat pada pertumbuhan Kluyveromyces lactis." Jurnal Teknik Kimia Indonesia 8, no. 2 (2018): 50. http://dx.doi.org/10.5614/jtki.2009.8.2.3.

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Substrat inhibition kinetic model of Kluyveromyces lactis growthFood industry waste such as whey may be utilized as substrates in fermentation processes. Kluyveromyces lactis is yeast that can metabolize the lactose content of whey. In fermentation process design, the kinetics data and growth model of the microorganism are essential. This research was done to identify the growth kinetic model of Kluyveromyces lactis FNCC 3024 in lactose, glucose, and galactose substrates. Substrate concentration was varied as 5, 10, 20, 50, 100, and 150 g/L. Yeast growth profile in glucose and lactose substrat

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Shirinyan, A. S., and Mykola Pasichnyy. "Hysteresis in the Process of Phase Separation of Nanopowder." Defect and Diffusion Forum 237-240 (April 2005): 1252–57. http://dx.doi.org/10.4028/www.scientific.net/ddf.237-240.1252.

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The influence of thermodynamic constraints like the size, depletion, surface tension and kinetic constraints like energy barrier for diffusion on nonsteady separation kinetics in binary nanopowder is investigated. Here we present a numeric analysis of size hysteresis and its peculiarities using the standard kinetic equation approach.

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Erceg, Matko, Miće Jakić, and Irena Krešić. "Utjecaj istraživača na rezultate kinetičke analize toplinske razgradnje polimera." Kemija u industriji 69, no. 9-10 (2020): 493–502. http://dx.doi.org/10.15255/kui.2020.044.

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U ovom radu ispitivan je utjecaj istraživača na rezultate kinetičke analize neizotermne toplinske razgradnje četiri polimera. Analizirani polimeri imaju različite stupnjeve složenosti razgradnog procesa. Kinetičku analizu provelo je troje istraživača, jedan znanstveni savjetnik, jedan znanstveni suradnik te jedan doktorand, a svi su se koristili istim eksperimentalnim termogravimetrijskim podatcima te istim kinetičkim programom (Netzsch Thermokinetics Professional). Rezultati nedvojbeno pokazuju da istraživači imaju značajan utjecaj na rezultate kinetičke analize, budući da su procese neizoter

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Jobe, B., N. S. Rattan, and H. S. Ramaswamy. "Kinetics of Quality Attributes of Potato Particulates during Cooking Process." International Journal of Food Engineering 12, no. 1 (2016): 27–35. http://dx.doi.org/10.1515/ijfe-2014-0341.

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Abstract Kinetics of thermal texture softening, color change and loss of ascorbic acid in potato (Solanum tuberosum) were investigated at selected temperature range (70–100°C) and heating time range (0–50 min). Cut samples of potatoes were heated in a constant temperature water bath at various temperatures. Heat-treated samples were evaluated for texture, color and ascorbic acid by use of a texture-testing machine, a color meter and spectrophotometer, respectively. The biphasic first-order model, the fractional conversion model and the simple first-order model were used for fitting experimenta

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Juliastuti, S. R., J. Baeyens, C. Creemers, and J. Degreve. "Determination of rate parameter for kinetics of nitrification." Jurnal Teknik Kimia Indonesia 4, no. 2 (2018): 234. http://dx.doi.org/10.5614/jtki.2005.4.2.7.

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Determination of rate parameter for kinetics of nitrification The nitrification process is the bottleneck step in the total nitrogen removal. The formation of nitrate is considered as the rate limiting step in the whole process and its kinetics determine the design of the nitrification reactor. Heavy metals (Zn2+ and Cu2+) and different organic compounds are used as micropollutants. These kinetics were experimentally measured by respirometry. In line with the aim of the paper, the experimental investigation are conducted to develop design equations to describe kinetic rate relationships under

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9

WU, Jia-Wei, Zhi-Xin WANG, and Jun-Mei ZHOU. "Inactivation kinetics of dihydrofolate reductase from Chinese hamster during urea denaturation." Biochemical Journal 324, no. 2 (1997): 395–401. http://dx.doi.org/10.1042/bj3240395.

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The kinetic theory of substrate reaction during modification of enzyme activity has been applied to the study of inactivation kinetics of Chinese hamster dihydrofolate reductase by urea [Tsou (1988) Adv. Enzymol. Relat. Areas Mol. Biol. 61, 381–436]. On the basis of the kinetic equation of substrate reaction in the presence of urea, all microscopic kinetic constants for the free enzyme and enzyme–substrate binary and ternary complexes have been determined. The results of the present study indicate that the denaturation of dihydrofolate reductase by urea follows single-phase kinetics, and chang

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Yen, Shih-Wei, Wei-Hsin Chen, Jo-Shu Chang, Chun-Fong Eng, Salman Raza Naqvi, and Pau Loke Show. "Torrefaction Thermogravimetric Analysis and Kinetics of Sorghum Distilled Residue for Sustainable Fuel Production." Sustainability 13, no. 8 (2021): 4246. http://dx.doi.org/10.3390/su13084246.

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This study investigated the kinetics of isothermal torrefaction of sorghum distilled residue (SDR), the main byproduct of the sorghum liquor-making process. The samples chosen were torrefied isothermally at five different temperatures under a nitrogen atmosphere in a thermogravimetric analyzer. Afterward, two different kinetic methods, the traditional model-free approach, and a two-step parallel reaction (TPR) kinetic model, were used to obtain the torrefaction kinetics of SDR. With the acquired 92–97% fit quality, which is the degree of similarity between calculated and real torrefaction curv

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11

Zhu, Hong. "Reaction Kinetics Analyses of Ethylenediamine Polyurea Curing Process." Advanced Materials Research 366 (October 2011): 438–43. http://dx.doi.org/10.4028/www.scientific.net/amr.366.438.

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Novel sterically hindered chain extender, 2-acetyl-ethylenediamine (MEDA) was synthesized by acetylating of ethylenediamine(EDA) with glacial acetic acid in presence of phosphoric acid, in order to reduce high reactivity of synthesizing polyurea and study its kinetics equation. Its chemical structure was confirmed through FTIR and 1H-NMR analysis. Polyureas were synthesized by reaction of 4,4’-dipheSuperscript textnylmethane diisocyanate(MDI), amine terminated polyether(D-2000) with different chain extenders. The reaction kinetics of polyurea curing process was studied by FTIR. The results sho

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Mannanova, G. I., and I. M. Gubaydullin. "Development of fifteen component kinetic model of catalytic cracking process." Computational Mathematics and Information Technologies 3, no. 2 (2019): 104–17. http://dx.doi.org/10.23947/2587-8999-2019-2-2-104-117.

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Zema, Michele, Serena C. Tarantino, M. Chiara Domeneghetti, and Vittorio Tazzoli. "Ca in orthopyroxene: structural variations and kinetics of the disordering process." European Journal of Mineralogy 15, no. 2 (2003): 373–80. http://dx.doi.org/10.1127/0935-1221/2003/0015-0373.

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Ordabaeva, Akhmetkarimova, Meiramov, et al. "Kinetics and thermodynamics of the process ofhydrodesulfurization of Shubarkol coal hydrogenate." Bulletin of the Karaganda University. "Chemistry" series 87, no. 3 (2017): 126–30. http://dx.doi.org/10.31489/2017ch3/126-130.

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15

Carrera-Escobedo, José, Oscar Cruz-Domínguez, César Guzmán-Valdivia, Víctor Carrera-Escobedo, Mario García-Ruiz, and Héctor Durán-Muñoz. "Cost analysis of drying process by studying its kinetic parameters: A new study in Mexican chillies." Czech Journal of Food Sciences 38, No. 6 (2020): 375–87. http://dx.doi.org/10.17221/96/2020-cjfs.

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The drying process of vegetables is a widely used technique for food conservation. However, this process can be expensive, and the cost highly depends on the ventilation, drying temperature and drying characteristics of the chillies. The contribution of this new study was to obtain the drying kinetics parameters of two different types of Mexican Capsicum annuum (Puya and Mulato) and model it at different temperatures with two different ventilation levels. The aim of this study is to provide a method to analyse the cost of the drying process by studying its drying kinetics parameters. The exper

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16

Rogozhnikov, D. A., and B. V. Kolmachikhin. "Polymetallic Ore Concentration Middlings Nitric Acid Leaching Kinetics." Solid State Phenomena 265 (September 2017): 1065–70. http://dx.doi.org/10.4028/www.scientific.net/ssp.265.1065.

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The purpose of this work is the kinetic evaluation of reactions occurring during nitric acid leaching of pollymetallic sulfide middlings, for the most complete translation of copper, zinc and sulfur in solution and concentration of precious metals in residue. Methodology is pollymetallic sulfide middlings nitric acid leaching kinetics were studied using mathematical methods such as the experimental data numerical differentiation. Relevance/value is the main sulfide minerals kinetic characteristics were obtained for the studied materials, including the rate of the process, order of reaction, th

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Strbac, N., I. Mihajlovic, D. Zivkovic, B. Boyanov, Z. Zivkovic, and M. Cocic. "Kinetics and mechanism of synthetic CoS oxidation process." Journal of Mining and Metallurgy, Section B: Metallurgy 42, no. 1 (2006): 81–91. http://dx.doi.org/10.2298/jmmb0601081s.

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The results of investigation of kinetics and mechanism for synthetic a-CoS oxidation process are presented in this paper. Based on experimental data obtained using DTA and XRD analysis and constructed PSD diagrams for Co-S-O system, mechanism of synthetic a-CoS oxidation process is suggested. Characteristic kinetic parameters were obtained for experimental isothermal investigations of desulfurization degree using Sharp method.

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Buronov, Firdavsiy, and Normurot Fayzullayev. "OPTIMIZATION OF VINYL ACETATE PRODUCTION PROCESS." ГРААЛЬ НАУКИ, no. 4 (May 14, 2021): 187–91. http://dx.doi.org/10.36074/grail-of-science.07.05.2021.035.

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In the article, the kinetic laws and kinetics and mechanism of the oxidation acetylationreaction of ethylene in the vapour phase were studied in detail in a catalyst containing0,4%Рd+4%Cu+7%CH3COOK/HSZ. It was found that the total rate of the reaction was proportionalto the amount of unmodified and modified active sites of palladium (not clusters). Excess amountsof the modifier (both potassium acetate and copper) have been shown to block active sites byreducing catalyst efficiency.

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Ulitin, N. V., K. A. Tereshchenco, D. A. Shiyan, and G. E. Zaikov. "CATIONIC COPOLYMERIZATION OF ISOBUTYLENE WITH ISOPRENE: KINETICS OF THE PROCESS AND DETERMINATION OF KINETIC CONSTANTS." Rubber Chemistry and Technology 88, no. 4 (2015): 574–83. http://dx.doi.org/10.5254/rct.15.84889.

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ABSTRACT A theoretical description has been developed of the kinetics of isobutylene with isoprene (IIR) cationic polymerization in the environment of methyl chloride on aluminum trichloride as the catalyst. Based on experimental data on the kinetics of copolymerization (isobutylene conversion curve) and the molecular weight characteristics of the copolymer of IIR, kinetic constants for the process were found. Adequacy of the developed theoretical description of the kinetics of the IIR copolymerization process was confirmed by comparing the experimental molecular-weight characteristics calcula

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Chan, T. W., G. D. Shyu, and A. I. Isayev. "Reduced Time Approach to Curing Kinetics, Part I: Dynamic Rate and Master Curve from Isothermal Data." Rubber Chemistry and Technology 66, no. 5 (1993): 849–64. http://dx.doi.org/10.5254/1.3538349.

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Abstract A reduced time approach has been used to predict nonisothermal curing kinetics based on isothermal kinetic data. This approach makes it clear that the conversion in a kinetic process is a function of the reduced time alone and allows for the construction of a master curve from isothermal kinetic data, indicating that the dynamic (or nonisothermal ) rate is equal to the isothermal rate. The approach can be applied to curing, crystallization, and other physico-chemical kinetics. A method is also described for correcting the nonisothermal curing kinetic data obtained from differential sc

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REVASKAR, V. A., P. S. PISALKAR, P. B. PATHARE, and G. P. SHARMA. "Dehydration kinetics of onion slices in osmotic and air convective drying process." Research in Agricultural Engineering 60, No. 3 (2014): 92–99. http://dx.doi.org/10.17221/22/2012-rae.

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The effect of different pre-treatments (i.e. osmotic dehydration in 10, 15 and 20&deg;Brix NaCl solution and drying air temperature of 50, 60 and 70&deg;C) on drying behaviour of onion slices were investigated. The onion slices were dried in a laboratory model tray dryer. Drying of onion slices occurred in falling rate period. Five thin-layer drying models (Exponential, Page, Henderson and Pabis, Logarithmic and Power law) were fitted to the moisture ratio data. Among the drying models investigated, the Page model satisfactorily described the drying behaviour of onion slices. The effec

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Wanta, Kevin Cleary, Felisha Hapsari Tanujaya, Ratna Frida Susanti, Himawan Tri Bayu Murti Petrus, Indra Perdana, and Widi Astuti. "Studi Kinetika Proses Atmospheric Pressure Acid Leaching Bijih Laterit Limonit Menggunakan Larutan Asam Nitrat Konsentrasi Rendah." Jurnal Rekayasa Proses 12, no. 2 (2018): 19. http://dx.doi.org/10.22146/jrekpros.35644.

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A B S T R A C TKinetics study of atmospheric pressure acid leaching (APAL) process is indispensable for extractor design in an industrial scale. So far, the kinetic model used for this process is the shrinking core model. In this study, the shrinking core model was evaluated against experimental data for laterite leaching process using a solution of low concentration nitric acid (0.1 M). Variations in temperature and particle size were carried out at 303–358 K and <75–250 microns. Other operating conditions, such as pulp density, stirring speed, and time were kept at 20% w/v, 200 rpm, and 1

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Prasetyaningrum, Aji, Teguh Riyanto, Mohamad Djaeni, and Widayat Widayat. "Photochemical Oxidation Process of Copper from Electroplating Wastewater: Process Performance and Kinetic Study." Processes 8, no. 10 (2020): 1276. http://dx.doi.org/10.3390/pr8101276.

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An investigation of the process of ozone combined with ultraviolet radiation has been carried out in order to establish the kinetics for photochemical oxidation of copper (Cu) from electroplating wastewater. The effects of operating parameters, including initial Cu concentration, ozone dosage, UV irradiation intensity, and pH value on the photochemical oxidation of Cu have been studied comprehensively. The Cu concentration during the reaction was identified using atomic absorption spectroscopy (AAS) method. The solid product was analyzed using X-ray diffraction (XRD) and scanning electron micr

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Vidal, Eduardo, Antonio Negro, Alberto Cassano, and Cristina Zalazar. "Simplified reaction kinetics, models and experiments for glyphosate degradation in water by the UV/H2O2process." Photochemical & Photobiological Sciences 14, no. 2 (2015): 366–77. http://dx.doi.org/10.1039/c4pp00248b.

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This work reports the degradation kinetics of glyphosate in water employing the UV/H<sub>2</sub>O<sub>2</sub>process. The kinetic model was experimentally validated. Results compare the kinetics of the herbicide alone and a commercial formulation.

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Niu, Qigui, Shilong He, Yanlong Zhang, Yu Zhang, Min Yang, and Yu-You Li. "Bio-kinetics evaluation and batch modeling of the anammox mixed culture in UASB and EGSB reactors: batch performance comparison and kinetic model assessment." RSC Advances 6, no. 5 (2016): 3487–500. http://dx.doi.org/10.1039/c5ra14648h.

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To predict the process performance and evaluate the MSAA of anammox biomass, a number of kinetic models were conducted both for UASB-anammox biomass and EGSB-anammox. All of the kinetics simulation resluts were compared to assess the kinetic models.

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Dumitraşa, Mihai. "Non-parametric kinetic analysis of thermogravimetric data for the thermal degradation of poly(tetrafluorethylene)." Acta Chemica Iasi 22, no. 2 (2014): 97–112. http://dx.doi.org/10.2478/achi-2014-0009.

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Abstract Thermal degradation of Teflon was investigated by thermoanalytical methods (TG and DTA). In the kinetic analysis of the experimental data, the NPK method proves to be a valuable tool, allowing for some new kinetic aspects of the degradation process to be obtained. Analysis of the computed isothermal and isoconversional vectors provided some insight into the reaction kinetics. Two different initiation pathways were suggested to control the global degradation kinetics, their relative contribution being temperature-dependant

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Wierzbowska, Bogusława, Krzysztof Piotrowski, Joanna Koralewska, and Andrzej Matynia. "Size-dependent growth kinetics of vitamin C crystals in water solutions of L(+)-ascorbic acid with the addition of methanol and ethanol." Polish Journal of Chemical Technology 10, no. 1 (2008): 60–65. http://dx.doi.org/10.2478/v10026-008-0015-5.

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Size-dependent growth kinetics of vitamin C crystals in water solutions of L(+)-ascorbic acid with the addition of methanol and ethanol Growth kinetics of vitamin C crystals during the batch mass crystallization process in L(+)-ascorbic acid - methanol - ethanol - water system was determined. The linear growth rate values were estimated on the basis of the product crystal size distributions. The kinetic model of the continuous process in a MSMPR crystallizer was adopted for the batch mode description according to Nyvlt's conception, taking the sizedependent growth (SDG) rate effects into consi

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Rahaman, M. S., N. Ellis, and D. S. Mavinic. "Effects of various process parameters on struvite precipitation kinetics and subsequent determination of rate constants." Water Science and Technology 57, no. 5 (2008): 647–54. http://dx.doi.org/10.2166/wst.2008.022.

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In this paper, struvite (MgNH4PO4·6H2O) precipitation kinetics were studied with different operating conditions (varying supersaturation, pH, Mg:P ratio, degree of mixing and seeding conditions) and relevant rate constants were determined by fitting a slightly modified first-order kinetic model to the experimental data obtained. The rate of change of ortho-P concentration in the bulk solutions increases with increasing supersaturation ratio. The estimated rate constants are 2.034, 1.716 and 0.690 hr−1 for the supersaturation ratio of 9.64, 4.83, and 2.44, respectively. Kinetic parameters were

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Pan, Feng, Zai Yuan Li, and Chun Ji Li. "Study on Kinetics of Nano-Ni(OH)₂Powder Ethanol Desorption Process." Advanced Materials Research 1015 (August 2014): 509–12. http://dx.doi.org/10.4028/www.scientific.net/amr.1015.509.

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This paper studies on the thermal analysis kinetics of nanometer powders ethanol desorption process.The DTA-TG-DTG curves obtain by SDT 2960 Simultaneous DSC-TGA analysis apparatus. Under the condition of N2atmosphere operation and rise temperature velocity was 10°C·min-1. The mechanism functionis used to calculate the kinetics factors. Reaction progressionnwas obtained by calculation of the kissinger peak shape factor method. The results showed that the apparent activation energy of nano-Ni(OH)2was 73.210 kJ·mol-1, the pre-exponential factor was 2.349×1012, the reaction progression was obtain

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Patan, Ameer Khan, Mallaiah Mekala, and Sunil Kumar Thamida. "Dynamic Simulation of Heterogeneous Catalysis at Particle Scale to Estimate the Kinetic Parameters for the Pore Diffusion Model." Bulletin of Chemical Reaction Engineering & Catalysis 13, no. 3 (2018): 420. http://dx.doi.org/10.9767/bcrec.13.3.2098.420-428.

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In this work, dynamic simulation at particle scale is carried out to predict the kinetics of solid catalyzed esterification reaction between acetic acid and methanol to produce methyl acetate and water. The reaction kinetic data utilized for modeling and validation is with solid catalyst as Indion 180. It was observed that the reaction rate and kinetics inside the pores of the catalyst is of higher magnitude as compared to bulk liquid. Each solid catalyst particle is surrounded by reactant solution of equal volume. A dynamic simulation is carried out using COMSOL Multiphysics which has solver

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Yur'ev, B. P., V. A. Gol'tsev, and V. A. Dudko. "Study of the process of siderite ore thermal treatment in a shaft furnace." Ferrous Metallurgy. Bulletin of Scientific , Technical and Economic Information, no. 8 (September 1, 2018): 36–42. http://dx.doi.org/10.32339/0135-5910-2018-8-36-42.

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Results of a study of kinetics of siderite ore roasting process in flows of air, helium and hydrogen presented. The study was carried out at mass measuring device with continuous registration of mass changing. An expression received for determining of apparent decarburization degree and its dependence determined on a piece dimension, thermal treatment duration and gas phase content. Using a generalized chemical kinetics equation, a formula received for determining of decomposition time of siderite ore specimens. Increase of decarburization pace at temperature rise determined for specimens of a

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Zulkeflee, Siti Asyura, Suhairi Abd Sata, and Norashid Aziz. "Kinetic Model with Effect of Water Content for Enzyme-Catalyzed Citronellyl Laurate Esterification Process." Applied Mechanics and Materials 284-287 (January 2013): 423–28. http://dx.doi.org/10.4028/www.scientific.net/amm.284-287.423.

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A kinetic model with effect of water content for enzyme-catalyzed citronellyl laurate was developed. These models incorporate the combined influences of established kinetics model with the function model on the effect of initial water content with kinetic parameters. The model development was carried out by performing a linear and nonlinear regression based on the behavior of the kinetic parameter profiles and validated with experimental data. Using the developed models, the influence of water content towards the enzyme-catalyzed initial rate of reaction was theoretically explained. It has bee

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Arkhangelsky, I. V., I. A. Godunov, N. V. Yashin, Yu K. Naganovskii та O. N. Shornikova. "The kinetics of intumescent ﬂame retardant foaming". Pozharovzryvobezopasnost/Fire and Explosion Safety 29, № 5 (2020): 71–81. http://dx.doi.org/10.22227/pvb.2020.29.05.71-81.

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Introduction. Intumescent ﬂame retardants are intensively used as passive ﬁre protection means. Under ﬁre conditions, these coatings foam and turn into coke, which turns into ash. These products have various ﬁre resistant properties. These transformations are possible due to the foaming process, whose kinetics determines the ﬁre protective characteristics of the compositions used. The paper considers the kinetics of the foaming process in the course of the pyrolysis of four different foaming compositions. The classical triad was used as a thermally expanding agent for the three of them, it inc

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Chen, Xi Liang, and Qing Nan Shi. "Research on Gelatinization Process of Starch." Advanced Materials Research 743 (August 2013): 223–26. http://dx.doi.org/10.4028/www.scientific.net/amr.743.223.

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Gelatinization is the main transformation of the starch dough undergoing cooking. This process is very important both for the texture and the nutritional properties of the final product. Starch gelatinization process has been studied by many workers, which includes the mechanism, kinetics, and influencing factors. The kinetic models have been used by works to predict the cooking process of starch. Finite element method (FEM) is commonly used in the simulation of starch gelatinization process. The simulation results can predict the cooking process of starch, and are helpful for optimizing the c

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Muhaimin, Muhaimin, Beta Wulan Febriana, and Septian Arfan. "Reaction Kinetics in Conversion Process of Pineapple Leaves into Glucose." Reaktor 18, no. 03 (2018): 155. http://dx.doi.org/10.14710/reaktor.18.03.155-159.

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Abstract This research aimed to determine the reaction kinetics in the process of hydrolysis of pineapple leaves. The experiment was carried out at the temperature (60, 90, and 120 oC) and variation of acid catalyst concentration (0.1; 0.5 and 1 M) by observation reaction time every 30 min. The kinetics model of hydrolysis reactions of pineapple leaves has shown first order reaction with activation energy value to find the concentration of sulfuric acid successively: 0.1 M; -15420 KJ/mol; 0,5 M; 3173.8 KJ/mol; 1 M; 100.53 KJ/mol. The reaction rate constant which produced the highest glucose le

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Maji, Prosenjit, and Swati Neogi. "Development of kinetics sub-model of cyanate ester-based prepregs for autoclave molding process simulation." High Temperature Materials and Processes 37, no. 8 (2018): 769–76. http://dx.doi.org/10.1515/htmp-2017-0039.

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AbstractAutoclave molding of prepregs is an established fabrication method to produce composite components to be used in the aerospace industry and elsewhere. The process involves the excess resin to flow out and curing of the resin. The process model simulation, which is very effective to optimize the process parameters and laminate properties, requires various sub-models to account for resin flow and resin curing. This work focuses on the curing behavior and development of kinetic sub-model of a quartz fabric prepreg impregnated with cyanate ester-based resin. Differential scanning calorimet

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Tanner, Robert D. "Process kinetics." Biotechnology Advances 11, no. 3 (1993): 589. http://dx.doi.org/10.1016/0734-9750(93)90027-k.

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Nguyen Dang Binh, Thanh, Dung Nguyen Trung, and Duc Hong Ta. "MODELING OF ESSENTIAL OIL EXTRACTION PROCESS: APPLICATION FOR ORANGE, POMELO, AND LEMONGRASS." Vietnam Journal of Science and Technology 56, no. 4A (2018): 182. http://dx.doi.org/10.15625/2525-2518/56/4a/12811.

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ABSTRACT - HCTN - 44In this study, the kinetic models of steam distillation of orange (Citrus Sinensis (L.) Osbeck), pomelo (Citrus grandis L.), and lemongrass (Cymbopogon Citratus) for the recovery of essential oils were developed. The model parameters were estimated based on experimental data and comprehensive kinetic mechanisms of the solid-liquid extraction process. Numerical results showed that, the extraction mechanism of the three materials were best fit to the Patricelli two-stage model in which the diffusion of the oil was followed by the washing step. Moreover, the model parameters o

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Jayanudin, Jayanudin, R. Rochmadi, Meri Yulvianti, Ahmad Imanudin, and Tri Rina Sari. "Kinetika Release Mikrokapsul Oleoresin Jahe Merah." REAKTOR 16, no. 3 (2017): 128. http://dx.doi.org/10.14710/reaktor.16.3.128--140.

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Abstract RELEASE KINETICS OF RED GINGER OLEORESIN MICROCAPSULES. Red ginger oleoresin microcapsule is used to protect the active component of medicine against the negative effect of the environment, thus the microcapsule can be applied in the pharmaceutical industries. Kinetic release is used to determine the rate of red ginger oleoresin microcapsule release in human body system. The models used for this purpose are zero order, first order, Higuchi, and Korsmeyer-Peppas. These models were completed by using graphical method to get the determination coefficient (R2). The aims of this research a

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BIZI, Mohamed. "Sulfamethoxazole Removal from Drinking Water by Activated Carbon: Kinetics and Diffusion Process." Molecules 25, no. 20 (2020): 4656. http://dx.doi.org/10.3390/molecules25204656.

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Sulfamethoxazole (SMX), a pharmaceutical residue, which is persistent and mobile in soils, shows low biodegradability, and is frequently found in the different aquatic compartments, can be found at very low concentrations in water intended for human consumption. In conditions compatible with industrial practices, the kinetic reactivity and performance of tap water purification using activated carbon powder (ACP) are examined here using two extreme mass ratios of SMX to ACP: 2 µg/L and 2 mg/L of SMX for only 10 mg/L of ACP. In response to surface chemistry, ACP texture and the intrinsic propert

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Morosanu, Eduard Alexandru, Fabio Salomone, Raffaele Pirone, and Samir Bensaid. "Insights on a Methanation Catalyst Aging Process: Aging Characterization and Kinetic Study." Catalysts 10, no. 3 (2020): 283. http://dx.doi.org/10.3390/catal10030283.

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Power to gas systems is one of the most interesting long-term energy storage solutions. As a result of the high exothermicity of the CO2 methanation reaction, the catalyst in the methanation subsystem is subjected to thermal stress. Therefore, the performance of a commercial Ni/Al2O3 catalyst was investigated over a series of 100 hour-long tests and in-process relevant conditions, i.e. 5 bar from 270 to 500 °C. Different characterization techniques were employed to determine the mechanism of the observed performance loss (N2 physisorption, XRD, TPO). The TPO analysis excluded carbon deposition

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Trninić, Marta. "Mathematical modelling of primary and secondary pyrolysis: State of the art." FME Transactions 48, no. 4 (2020): 733–44. http://dx.doi.org/10.5937/fme2004733t.

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Pyrolysis process converts biomass into liquid, gaseous and solid fuels. Chemical kinetics play a key role in explaining the characteristics of pyrolysis reactions and developing mathematical models. Many studies have been undertaken to understand the kinetics of biomass pyrolysis; however, due to the heterogeneity of biomass and the complexity of the chemical and physical changes that occur during pyrolysis, it is difficult to develop a simple kinetic model that is applicable in every case. In this review, different methods to describe biomass primary and secondary pyrolysis with different ty

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Šánek, Lubomír, Pecha Jiří, Jakub Husár, and Karel Kolomazník. "Mathematical modeling of transesterification process kinetics of triglycerides catalyzed by TMAH." MATEC Web of Conferences 292 (2019): 01027. http://dx.doi.org/10.1051/matecconf/201929201027.

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Biodiesel is a renewable fuel mainly produced by methylation of triglycerides of vegetable oils or animal fats. The production processes nowadays are particularly based on the utilization of inorganic alkali catalysts. However, it has been proved that an organic alkali – tetramethylammonium hydroxide (TMAH) – can also be used as a very efficient transesterification catalyst. The work presented herein is focused on mathematical modeling of the kinetics of TMAH-catalyzed transesterification of triglycerides at different reaction conditions, specifically at varying reaction temperature with the a

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Olakunle, M. S., A. O. Ameh, T. Oyegoke, and H. U. Shehu. "Effect of Ethyl Acetate, Time and Particle Size on the Kinetics of the Oleoresin Extraction Process." Journal of Engineering Sciences 7, no. 2 (2020): F15—F23. http://dx.doi.org/10.21272/es.2020.7(2).f3.

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The kinetics of the extraction of oleoresin from ginger using ethyl acetate as the solvent was studied in this work. The effects of particle size and extraction time on oleoresin’s solvent extraction were studied to obtain optimization data. The temperature of the process was kept constant at 40 °C. The Ginger particle sizes considered ranged between 1200-250 microns at extraction times ranging between 10–70 minutes. Experimental data generated were fitted into an empirical model to determine the kinetic parameters. The oleoresin yield increases with increasing extraction time up to an optimum

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Olakunle, M. S., A. O. Ameh, T. Oyegoke, and H. U. Shehu. "Effect of Ethyl Acetate, Time and Particle Size on the Kinetics of the Oleoresin Extraction Process." Journal of Engineering Sciences 7, no. 2 (2020): F15—F23. http://dx.doi.org/10.21272/jes.2020.7(2).f3.

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The kinetics of the extraction of oleoresin from ginger using ethyl acetate as the solvent was studied in this work. The effects of particle size and extraction time on oleoresin’s solvent extraction were studied to obtain optimization data. The temperature of the process was kept constant at 40 °C. The Ginger particle sizes considered ranged between 1200-250 microns at extraction times ranging between 10–70 minutes. Experimental data generated were fitted into an empirical model to determine the kinetic parameters. The oleoresin yield increases with increasing extraction time up to an optimum

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Reczek, Lidia, Magdalena M. Michel, Yuliia Trach, Tadeusz Siwiec, and Marta Tytkowska-Owerko. "The Kinetics of Manganese Sorption on Ukrainian Tuff and Basalt—Order and Diffusion Models Analysis." Minerals 10, no. 12 (2020): 1065. http://dx.doi.org/10.3390/min10121065.

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The study aimed to determine the nature of the kinetics of the manganese sorption process on Ukrainian tuff and basalt at different temperatures characteristic of the natural water environment. The scope of the research included manganese sorption kinetic test on natural mineral sorbents at temperatures of 10, 17.5 and 25 °C in slightly acidic conditions. Sorption (pseudo-first order, pseudo-second order and Elovich models) and diffusion kinetic models (liquid film diffusion and intraparticle diffusion) were used in the analysis of test results. The manganese sorption process on both tuff and

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Semenyshyn, Yevgen, Volodymyr Atamanyuk, Tetiana Rymar, Oleksandr Ivashchuk, and Anna Hlukhaniuk. "Mass Transfer in the Solid-Liquid System: Mechanism and Kinetics of the Extraction Process." Chemistry & Chemical Technology 14, no. 1 (2020): 121–28. http://dx.doi.org/10.23939/chcht14.01.121.

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Basuki, Rahmat, Bambang Rusdiarso, Sri Juari Santosa, and Dwi Siswanta. "The Dependency of Kinetic Parameters as a Function of Initial Solute Concentration: New Insight from Adsorption of Dye and Heavy Metals onto Humic-Like Modified Adsorbents." Bulletin of Chemical Reaction Engineering & Catalysis 16, no. 4 (2021): 773–95. http://dx.doi.org/10.9767/bcrec.16.4.11816.773-795.

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Kinetics parameters are the essential issue in the design of water treatment systems for pollutants uptake. Though numerous studies have identified the boundary conditions that exert influence on the kinetics parameters, the influence of the dynamic initial solute concentration (C0) to the kinetic parameters generated from fitting kinetics model to experimental data has not been investigated thoroughly. This study revealed a change in the kinetics parameter value due to changes in the adsorption mechanism as an effect of dynamic C0. It was observed that at higher C0 the adsorbed solute at equi

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Abbas, Ahmed Mohammed, Suha Sahib Abd, and Takialdin Abdulhadi Himdan. "Kinetic Study of Methyl Green Dye Adsorption from Aqueous Solution by Bauxite Clay at Different Temperatures." Ibn AL- Haitham Journal For Pure and Applied Science 31, no. 1 (2018): 58. http://dx.doi.org/10.30526/31.1.1853.

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Kinetic experiments were performed to induce of the green methyl dye adsorption from aqueous solution on the bauxite clay. This study includes determination of the adsorption capacity of bauxite clay to methyl green dye adsorption and study the effect of some parameters ( temperature , time ) on the kinetic of the adsorption process of the dye were studied. Quantity of dye adsorbed was increased when the temperature increases from 298 to 318K which indicates that methyl green adsorption processes are endothermic nature . In order to describe the kinetic data and the rate adsorption constants o

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Lomova, Tatyana N., Mariya E. Klyueva, Elena Yu Tyulyaeva, and Nataliya G. Bichan. "Use of chemical kinetics for the description of metal porphyrin reactivity." Journal of Porphyrins and Phthalocyanines 16, no. 09 (2012): 1040–54. http://dx.doi.org/10.1142/s1088424612500769.

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The results of use of chemical kinetics receptions, approaches and methods for the study of porphyrins and their metal complexes reactivity are discussed on an example of oxidation, acid-basic, and catalytic reactions of rhodium, palladium, and rhenium complexes of porphyrin in liquid solutions. The peculiarity of the porphyrin reaction rates is analyzed in a brief context of general provisions of the chemical kinetics. The opportunity to use the quasistationarity principle at the definition of the kinetic equation of the reactions with participation of metal porphyrins is shown. The transitio

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