scholarly journals Analysis of the Experimental Data of Acid Hydrolysis in Micelle Assemblies Using Kinetic Model

2020 ◽  
Vol 13 (3) ◽  
pp. 195-202
Author(s):  
D. K. Pandey ◽  
S. Biswas
Keyword(s):  
Experimental Data ◽  
Kinetic Model ◽  
Acid Hydrolysis ◽  
Kinetic Data ◽  
Good Explanation ◽  
Micellar Media ◽  
Modeling Techniques ◽  
Different Types ◽  
Hydroxamate Ions ◽  
Hydrolysis Of

Acid Hydrolysis of carboxylate ester with hydroxamate ions in micellar media has been discussed in our last research works. In this paper, we used all the obtained kinetic experimental data for correlation and explanation by modeling techniques. We know the different types of modeling techniques available and used in the current times. Michael menten one site total binding constant and one site fite Ki models apply for the explanation of kinetics data. The models were given a good explanation and correlation of these types of kinetic data.

Kinetics of Catalytic Dehydration of 1-Pentanol

1993 ◽  
Vol 58 (8) ◽  
pp. 1874-1884 ◽  
Author(s):  
Iveta Vašutová ◽  
Milan Králik ◽  
Milan Hronec
Keyword(s):  
Experimental Data ◽  
Kinetic Data ◽  
Potassium Hydroxide ◽  
Molar Fraction ◽  
Space Velocity ◽  
Continuous Reactor ◽  
Alumina Catalyst ◽  
Direct Formation ◽  
Kinetics Of ◽  
Hydrolysis Of

Kinetic data of 1-pentanol dehydration on γ-alumina catalyst modified by potassium hydroxide were obtained using a continuous reactor with an internal recirculation. The conversion of 1-pentanol on this catalyst in the temperature range 300 - 390 °C and space velocity 1 - 8 kg (h kg)-1 (molar fraction of water in the feed was in the range 0 - 0.56) was 50 - 98% and the selectivity with respect to 1-pentene was 50 - 84%. The following six reactions have been taken into account to describe the catalytic dehydration of 1-pantanol: direct formation of 1-pentene from 1-pentanol, formation of bis(1-pentyl) ether from 1-pentanol, disproportionation of the ether to 1-pentanol and 1-pentene, formation of 1-pentene from the ether, isomerization of 1-pentene to 2-pentene and hydrolysis of the ether to 1-pentanol. Treatment of experimental data by Langmuir-Hinshelwood models showed that the model involving adsorption of 1-pentanol accompanied by dissociation is the most suitable one.

scholarly journals Acid Hydrolysis of Lignocellulosic Materials for The Production of Second Generation Ethanol

2021 ◽  
Author(s):  
Mariane Daniella Silva ◽  
João Pedro Cano ◽  
Fernanda Maria Pagane Guereschi Ernandes ◽  
Crispin Humberto Garcia-Cruz
Keyword(s):  
Acid Hydrolysis ◽  
Agricultural Production ◽  
Fossil Fuels ◽  
Second Generation ◽  
Reducing Sugars ◽  
Lignocellulosic Materials ◽  
Sugar Release ◽  
Different Types ◽  
Hydrolysis Of ◽  
Second Generation Ethanol

Abstract Brazil is one of the countries with the largest agricultural production in the world. Therefore, it is capable of generating large amounts of agro-industrial waste that can be used as biomass for the production of biofuels. Second generation ethanol is a renewable energy alternative, capable of replacing fossil fuels. Within this context, the objective of the present work was to study the effect of diluted acid hydrolysis in different types of lignocellulosic residues and the consequent production of 2G ethanol from these hydrolysates using different fermenting microorganisms. The acid concentration that released the highest content of fermentable sugars from the acid hydrolysis of lignocellulosic materials was 5.0% of sulfuric acid and the contact time with the biomass was 15 min. while heating in autoclave. The material that showed the highest sugar release after acid hydrolysis was cassava residues, with 131.09 g.L− 1 of reducing sugars. The fermentations were carried out with microorganisms alone and also in consortium. The largest production of 2G ethanol was from the hydrolyzate of soybean hulls, of 47.70 g.L− 1 of ethanol by the consortium of Zymomonasmobilis and Candida tropicalis, during 8 h of fermentation and showed productivity of 5.96 g.L− 1.h− 1.

Acid hydrolysis of glycosidic bonds in oat β‐glucan and development of a structured kinetic model

AIChE Journal ◽  
2018 ◽  
Vol 64 (7) ◽  
pp. 2570-2580 ◽  
Author(s):  
Hoang S. H. Nguyen ◽  
Jari Heinonen ◽  
Tuomo Sainio
Keyword(s):  
Kinetic Model ◽  
Acid Hydrolysis ◽  
Glycosidic Bonds ◽  
Structured Kinetic Model ◽  
Hydrolysis Of

Hydrolysis Kinetics of Straw Biomass Catalyzed by Diluted Sulphuric Acid in the Present of Fe2+

2012 ◽  
Vol 550-553 ◽  
pp. 484-487 ◽  
Author(s):  
Chong Wen Jiang ◽  
Can Chen Bai ◽  
Hao Xiao
Keyword(s):  
Experimental Data ◽  
Sulfuric Acid ◽  
Kinetic Model ◽  
Acid Catalyst ◽  
Fermentable Sugars ◽  
Hydrolysis Kinetics ◽  
First Order ◽  
Sulfuric Acid Catalyst ◽  
Kinetics Of ◽  
Hydrolysis Of

This study focuses on kinetics of straw hydrolysis using sulfuric acid catalyst to produce fermentable sugars. The result shows the degradation of sugars is encountered during the hydrolysis of straw biomass. A consecutive first-order reactions kinetic model is proposed and the kinetic model well agrees with the experimental data. It turns out that rate of sugar formation and degradation is small at lower experimental temperature. The reactions rates constant k1 including the formation of sugar begins to increase rapidly when the Fe2+concentration increases from 0.125 to 0.500molL-1. However, the rate constant k2 relevant with the degradation of sugar varies unsensibly below 0.375molL-1 Fe2+and it is accelerated as the Fe2+concentration increases to 0.500molL-1. Thus the optimum yield is obtained at 0.375molL-1 Fe2+concentration.

Reduced Time Approach to Curing Kinetics, Part II: Master Curve from Nonisothermal Data

1994 ◽  
Vol 67 (2) ◽  
pp. 314-328 ◽  
Author(s):  
G. D. Shyu ◽  
T. W. Chan ◽  
A. I. Isayev
Keyword(s):  
Experimental Data ◽  
Kinetic Model ◽  
Kinetic Data ◽  
Master Curve ◽  
Curing Kinetics ◽  
Reference Temperature ◽  
Scanning Calorimetry ◽  
Kinetic Information ◽  
Wide Range ◽  
Curing Kinetic

Abstract Nonisothermal curing kinetic data obtained from differential scanning calorimetry (DSC) for a rubber compound are corrected for the effects of temperature lag between the DSC sample and furnace. The method of Eder and Janeschitz-Kriegl, which is based on experimental data alone without reference to any kinetic model, is used for these corrections. A method is presented for shifting the corrected nonisothermal curing kinetic data with respect to an arbitrarily chosen reference temperature to obtain a master curve. The method is based on experimental data alone without assuming any specific form of kinetic model. When the isothermal curing kinetic data for the same material are shifted with respect to the same reference temperature, a master curve is also obtained which basically overlaps the corresponding master curve from nonisothermal data. It follows that nonisothermal DSC measurements provide the same curing kinetic information as isothermal ones, only over a wider range of temperatures. The shift factors obtained from experimental data alone are compared with the corresponding values calculated from a kinetic model with an Arrhenius type of temperature dependence. This serves as a means of model evaluation. It is concluded that the kinetic model is good at describing isothermal curing kinetic data. But it yields reliable curing kinetic information over a narrower range of temperatures than nonisothermal data alone without resort to any model. The Arrhenius extrapolation of the limited isothermal data to a wide range of temperatures is quite good.

Sign in / Sign up

Export Citation Format

Share Document