scholarly journals A kinetic model for ethylene oligomerization using zirconium/aluminum- and nickel/zinc-based catalyst systems in a batch reactor

2014 ◽  
Vol 4 (3) ◽  
pp. 287-295 ◽  
Author(s):  
Adil A. Mohammed ◽  
Seif-Eddeen K. Fateen ◽  
Tamer S. Ahmed ◽  
Tarek M. Moustafa
Keyword(s):  
Kinetic Model ◽  
Batch Reactor ◽  
Ethylene Oligomerization ◽  
Nickel Zinc ◽  
Catalyst Systems

Intensification of the Production of 2-Ethyl-Hexyl Acrylate: Batch Kinetics and Reactive Distillation

2018 ◽  
Vol 16 (7) ◽  
Author(s):  
Vivek D. Talnikar ◽  
Onkar A. Deorukhkar ◽  
Amit Katariya ◽  
Yogesh S. Mahajan
Keyword(s):  
Kinetic Model ◽  
Acrylic Acid ◽  
Process Development ◽  
Reactive Distillation ◽  
Batch Reactor ◽  
Process Intensification ◽  
Complete Conversion ◽  
Reaction Conditions ◽  
Batch Mode ◽  
Batch Kinetics

Abstract The reaction of acrylic acid and 2-ethyl-1 hexanol was explored in this work with the intent of process intensification. In order to assess the effect of important parameters on the course of reaction, this work initially conducted batch reactor experiments. Reaction conditions in the batch reactor for a specific conversion (~ 30 %) were obtained. A kinetic model was then obtained through regression to arrive at a rate expression that is later used in process development. Experiments were performed in the reactive distillation (RD) environment in batch mode, which showed substantial increase in conversion (~ 80 %) indicating the applicability of RD. Further, this work performed simulation in the RD environment to assess process intensification. Simulations show that it is possible to obtain complete conversion of the acid.

scholarly journals Kinetics of Vinyl Acetate Biodegradation by Pseudomonas fluorescens PCM 2123

2018 ◽  
Vol 25 (3) ◽  
pp. 487-502 ◽  
Author(s):  
Agnieszka Gąszczak ◽  
Grażyna Bartelmus ◽  
Izabela Greń ◽  
Daniel Janecki
Keyword(s):  
Kinetic Model ◽  
Pseudomonas Fluorescens ◽  
Vinyl Acetate ◽  
Batch Reactor ◽  
Dry Weight ◽  
Growth Substrate ◽  
Biodegradation Rate ◽  
Maintenance Metabolism ◽  
Kinetics Of ◽  
Substrate Concentrations

Abstract The microbial degradation of vinyl acetate (VA) by Pseudomonas fluorescens PCM 2123 strain was studied in both batch and continuous modes. The purpose of the experiments was to determine the kinetic model of the cell growth and biodegradation rate of vinyl acetate (VA), which was the sole carbon and energy source for tested microorganisms. The experiments, carried out in a batch reactor for several initial concentrations of growth substrate in the liquid phase ranging from 18.6 to 373 gsubstrate·m−3 (gs·m−3) made it possible to choose the kinetic model and to estimate its constants. The Haldane inhibitory model with the values of constants: μm = 0.1202 h−1, KS = 17.195 gs·m−3, Ki = 166.88 gs·m−3 predicted the experimental data with the best accuracy. To set the parameters of maintenance metabolism it was necessary to carry out a series of continuous cultures at different dilution rates (0.05 to 0.072 h−1) and concentrations of VA in the liquid supplied to the chemostat ranging from 30.9 to 123.6 gs·m−3. The obtained data-base enabled to determine the coefficient for maintenance metabolism (me = 0.0251 gsubstrate gcell dry weight−1·h−1 (gs·gcdw−1·h−1)) as well as the maximal and observed values of yield coefficients, Yxs M = 0.463 gcdw·gs−1 and (Yxs)obs = 0.411 gcdw·gs−1, respectively. The developed kinetics was verified by comparison of the computed and obtained in batch experiments profiles of changes in biomass and growth substrate concentrations.

scholarly journals Uptake of divalent manganese from aqueous solution using cation exchange resins

2016 ◽  
Vol 12 (4) ◽  
pp. 4312-4323
Author(s):  
Ayman Abdallah Ahmed
Keyword(s):  
Experimental Data ◽  
Aqueous Solution ◽  
Kinetic Model ◽  
Cation Exchange ◽  
Batch Reactor ◽  
Kinetic Equations ◽  
Correlation Coefficients ◽  
Manganese Removal ◽  
Cation Exchange Resins ◽  
Exchange Resins

The present work deals with the removal of highly toxic manganese ion from aqueous solution using cation exchange resins namely, Amberjet 1500H, Amberjet 1300H and Amberlite IRC86. The study was carried out in media of various ionic strengths (1.98-9.98 mmol/L), different resin dose (0.25-8.0 gm) and a wide solution acidity range (0.001-1.0 M), in addition to at three temperatures (293-318 K).The aim of this study was to understand the mechanisms that govern manganese removal and find a suitable equilibrium isotherm and kinetic model for the manganese removal in a batch reactor. The experimental isotherm data were analyzed using the Langmuir, Freundlich, Temkin and Dubinin–Radushkevich (D–R) equations. The experimental data were analyzed using four adsorption kinetic models – the pseudo first- and second-order, intraparticle diffusion and the Elovich equations – to determine the best fit equation for the adsorption of manganese ions onto the resins. The rate constants, equilibrium capacities and related correlation coefficients for each kinetic model were calculated and discussed. Also, predicted qt values from the kinetic equations were compared with the experimental data. Thermodynamic parameters, involving ΔH, ΔS and ΔG were also calculated from graphical interpretation of the experimental data

2D-QSPR/DFT studies of aryl-substituted PNP-Cr-based catalyst systems for highly selective ethylene oligomerization

2014 ◽  
Vol 20 (3) ◽  
Author(s):  
Siyang Tang ◽  
Zhen Liu ◽  
Xingwen Zhan ◽  
Ruihua Cheng ◽  
Xuelian He ◽  
...  
Keyword(s):  
Ethylene Oligomerization ◽  
Dft Studies ◽  
Catalyst Systems

scholarly journals MODELAMIENTO DE LA CINÉTICA DE HIDRÓLISIS ENZIMÁTICA DE PROTEÍNAS DEL PLASMA BOVINO (MODELING OF THE KINETICS OF ENZYMATIC HYDROLYSIS OF BOVINE PLASMA PROTEINS)

Revista EIA ◽  
2013 ◽  
Vol 9 (17) ◽  
pp. 71
Author(s):  
Omar Alfredo Figueroa ◽  
José Édgar Zapata ◽  
Gail Albeiro Gutiérrez
Keyword(s):  
Kinetic Model ◽  
Plasma Proteins ◽  
Batch Reactor ◽  
Degree Of Hydrolysis ◽  
Order Kinetic ◽  
Enzyme Substrate ◽  
Bovine Plasma ◽  
Order Kinetic Model ◽  
Rate Of Hydrolysis ◽  
Hydrolysis Of

Se utilizó un modelo cinético para estudiar la velocidad de reacción en la hidrólisis de proteínas de plasma de bovino con alcalasa 2,4 L en un reactor batch. Se estudió la influencia de variables como la concentración inicial de sustrato y enzima sobre el grado de hidrólisis y se determinaron los parámetros cinéticos de la ecuación de velocidad, analizando su relación con las variables de trabajo. Se ajustó un modelo cinético de orden cero y desactivación enzimática por sustrato, de segundo orden, así como la relación directa entre la fracción enzima-sustrato y la tasa de formación de productos de hidrólisis.Abstract: A kinetic model was used to study the reaction rate of hydrolysis of bovine plasma proteins and alcalase 2.4 L, in a batch reactor. The influence of variables, such as the concentration of initial enzyme substrate and the degree of hydrolysis was studied, and kinetic parameters of the rate equation were determined by analyzing its relationship with the work variables. A zero-order kinetic model and enzyme deactivation by substrate was found, as well as the direct relationship between the fraction of enzyme-substrate and the rate of formation of hydrolysis products.

scholarly journals Diagnosing Surface Versus Bulk Reactivity for Molecular Catalysis Within Metal-Organic Frameworks Using a Quantitative Kinetic Model

2020 ◽  
Author(s):  
Ben A Johnson ◽  
Sascha Ott
Keyword(s):  
Kinetic Model ◽  
Metal Organic Frameworks ◽  
Reaction Diffusion ◽  
Surface Reactivity ◽  
Diffusion Kinetic ◽  
Molecular Catalyst ◽  
Quantitative Metrics ◽  
Metal Organic ◽  
Catalyst Systems ◽  
Molecular Catalysts

<div> <p>Metal-organic frameworks (MOFs) are becoming increasingly popular as heterogenous support matrices for molecular catalysts. Given that reactants, or potentially holes/electrons, need to diffuse into the porous framework as the reaction proceeds, the reaction can possibly take place within the bulk of the particle or be confined to a thin layer at the surface due to transport limitations. Herein, a simple steady-state reaction-diffusion kinetic model is developed to diagnose these two mutually exclusive behaviors in MOF-based systems. The oxygen evolution reaction (OER) driven by a chemical oxidant is presented as an example mechanism. Quantitative metrics for assigning either bulk or surface reactivity are delineated over a wide variety of conditions, and numerical simulations are employed to verify these results. For each case, expressions for the turnover frequency (TOF) are outlined, and it is shown that surface reactivity can influence measured TOFs. Importantly, this report shows how to transition from surface to bulk reactivity and thus identifies which experimental parameters to target for optimizing the efficiency of MOF-based molecular catalyst systems.</p> </div> <br>

Ethylene oligomerization in the presence of catalyst systems based on mixed-ligand β-diketonatozirconium chlorides

2006 ◽  
Vol 46 (5) ◽  
pp. 338-342 ◽  
Author(s):  
A. A. Khanmetov ◽  
A. G. Azizov ◽  
A. G. Piraliev
Keyword(s):  
Mixed Ligand ◽  
Ethylene Oligomerization ◽  
Catalyst Systems
Sign in / Sign up

Export Citation Format

Share Document