The effect of temperature, pH, and initial glucose concentration on the kinetics of ethanol production by Zymomonas mobilis in batch fermentation

1982 ◽  
Vol 4 (8) ◽  
pp. 531-536 ◽  
Author(s):  
Franklin G. King ◽  
Muhammad A. Hossain
Keyword(s):  
Ethanol Production ◽  
Glucose Concentration ◽  
Batch Fermentation ◽  
Zymomonas Mobilis ◽  
Effect Of Temperature ◽  
Initial Glucose Concentration ◽  
Kinetics Of

The effect of temperature on the kinetics of ethanol production by strains of Zymomonas mobilis

1981 ◽  
Vol 3 (6) ◽  
pp. 291-296 ◽  
Author(s):  
K. J. Lee ◽  
M. L. Skotnicki ◽  
D. E. Tribe ◽  
P. L. Rogers
Keyword(s):  
Ethanol Production ◽  
Zymomonas Mobilis ◽  
Effect Of Temperature ◽  
Kinetics Of

scholarly journals Influence of the reactor shape on the kinetics of ethanol production in laboratory-scale batch fermentation tests carried out in unstirred vessels

2006 ◽  
Vol 49 (3) ◽  
pp. 503-514 ◽  
Author(s):  
Walter Borzani ◽  
Fabiana Saraguza de Souza ◽  
Claudia Yoshie Soyama ◽  
Patricia Marie Furuko ◽  
Daniela Souza Ferreira
Keyword(s):  
Ethanol Production ◽  
Batch Fermentation ◽  
Dry Matter ◽  
Ethanol Yield ◽  
Laboratory Scale ◽  
Yeast Cells ◽  
Initial Glucose Concentration ◽  
Measuring Cylinder ◽  
L 14 ◽  
Kinetics Of

The influence of the shape of laboratory-scale unstirred reactors on the kinetics of ethanol production in batch ethanol fermentation was studied. Two reactors were used: a 1-L glass measuring cylinder and a 2-L Erlenmeyer flask. The volume of inoculated medium in each reactor was 1,000 mL. The above influence was affected by the ratio between the initial yeast cells concentration (X0: ~ 7 g/L, ~ 14 g/L, and ~ 21 g/L, dry matter) and the initial glucose concentration (S0: ~ 100 g/L, ~ 150 g/L and ~ 200 g/L). When X0/S0 increased from 0.038 to 0.219 the influence of the reactor shape decreased, and was not observed when X0/S0 = 0.22 to 0.24. The reactor shape practically did not affect the ethanol yield, the final yeast cells concentration and both the viability and the morphology of the cells in tests carried out at the same value of X0/S0.

scholarly journals Reaction Kinetics of Levulinic Acid Synthesis from Glucose Using Bronsted Acid Catalyst

2021 ◽  
Author(s):  
Meutia Ermina Toif ◽  
Muslikhin Hidayat ◽  
Rochmadi Rochmadi ◽  
Arief Budiman
Keyword(s):  
Reaction Kinetics ◽  
Glucose Concentration ◽  
Levulinic Acid ◽  
Acid Catalyst ◽  
Operating Conditions ◽  
Bronsted Acid ◽  
Brønsted Acid ◽  
Initial Glucose Concentration ◽  
Brönsted Acid ◽  
Kinetics Of

Abstract Glucose is the primary derivative of lignocellulosic biomass, which is abundantly available. Glucose has excellent potential to be converted into valuable compounds such as ethanol, sorbitol, gluconic acid, and levulinic acid (LA). Levulinic acid is a very promising green platform chemical. It is composed of two functional groups, ketone and carboxylate groups which can act as highly reactive electrophiles for nucleophilic attack so it has extensive applications, including fuel additives, raw materials for the pharmaceutical industry, and cosmetics. The reaction kinetics of LA synthesis from glucose using hydrochloric acid catalyst (bronsted acid) were studied in a wide range of operating conditions, i.e., temperature of 140-180 oC, catalyst concentration of 0.5-1.5 M, and initial glucose concentration of 0.1-0.5 M. The highest LA yield is 48.34 %wt at 0.1 M initial glucose concentration, 1 M HCl, and temperature of 180 oC. The experimental results show that the bronsted acid catalyst's reaction pathway consists of glucose decomposition to levoglucosan (LG), conversion of LG to 5-hydroxymethylfurfural (HMF), and rehydration of HMF to LA. The experimental data yields a good fitting by assuming a first-order reaction model.

The kinetics of ethanol production by Zymomonas mobilis on fructose and sucrose media

1981 ◽  
Vol 3 (5) ◽  
pp. 207-212 ◽  
Author(s):  
K. J. Lee ◽  
M. L. Skotnicki ◽  
D. E. Tribe ◽  
P. L. Rogers
Keyword(s):  
Ethanol Production ◽  
Zymomonas Mobilis ◽  
Kinetics Of

scholarly journals Reaction Kinetics of Levulinic Acid Synthesis from Glucose Using Bronsted Acid Catalyst

2021 ◽  
Vol 16 (4) ◽  
pp. 904-915
Author(s):  
Meutia Ermina Toif ◽  
Muslikhin Hidayat ◽  
Rochmadi Rochmadi ◽  
Arief Budiman
Keyword(s):  
Reaction Kinetics ◽  
Glucose Concentration ◽  
Levulinic Acid ◽  
Operating Conditions ◽  
Nucleophilic Attack ◽  
Bronsted Acid ◽  
Brønsted Acid ◽  
Initial Glucose Concentration ◽  
Brönsted Acid ◽  
Kinetics Of

Glucose is one of the primary derivative products from lignocellulosic biomass, which is abundantly available. Glucose has excellent potential to be converted into valuable compounds such as ethanol, sorbitol, gluconic acid, and levulinic acid (LA). Levulinic acid is an exceptionally promising green platform chemical. It comprises two functional groups, ketone and carboxylate, acting as highly reactive electrophiles for a nucleophilic attack. Therefore, it has extensive applications, including fuel additives, raw materials for the pharmaceutical industry, and cosmetics. This study reports the reaction kinetics of LA synthesis from glucose catalyzed by hydrochloric acid (HCl), a Bronsted acid, that was carried out under a wide range of operating conditions; i.e. the temperature of 140–180 °C, catalyst concentration of 0.5–1.5 M, and initial glucose concentration of 0.1–0.5 M. The highest LA yield of 48.34 % was able to be obtained from an initial glucose concentration of 0.1 M and by using 1 M HCl at 180 °C. The experimental results show that the Bronsted acid-catalyzed reaction pathway consists of glucose decomposition to levoglucosan (LG), conversion of LG to 5-hydroxymethylfurfural (HMF), and rehydration of HMF to LA. The experimental data yields a good fitting by assuming a first-order reaction model. Copyright © 2021 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0). 

Studi Kinetika Konsumsi Glukosa oleh Aspergillus Niger dalam Produksi Bioethanol dari Lignoselulosa

2017 ◽  
Vol 4 (1) ◽  
pp. 14
Author(s):  
Setyo Erna Widiyanti
Keyword(s):  
Growth Rate ◽  
Citric Acid ◽  
Aspergillus Niger ◽  
Kinetic Parameters ◽  
Glucose Concentration ◽  
Raw Materials ◽  
Glucose Consumption ◽  
Product Formation ◽  
Initial Glucose Concentration ◽  
Kinetics Of

Global warming resulted from CO2 level increase in the atmosphere has caused elevation of earth temperature and uncertain climate changes. To prevent the rise of CO2 in the atmosphere can be done by using biomass fuel such as bioethanol. The raw materials of bioethanol can be derived from oil palm empty fruit bunch. Enzymatic hydrolysis utilizes cellulase-producing fungus and in this research, Aspergillus niger was chosen. The glucose produced is consumed by A niger as carbon source and this is undesirable, therefore it should be minimized as low as possible. Knowing the rate of glucose consumption is important to have a model of the hydrolysis reaction rate which will be helpful in the design process on an industrial scale hydrolysis reactor. This study aimed to determine the equations that can be used to approximate the growth rate of A. niger, glucose consumption, the formation of citric acid, and the kinetic parameters used to modeling the kinetics of glucose consumption by A. niger. Kinetics of glucose consumption by A. niger was studied in batch system with variation of initial glucose concentration of 30, 50, 70 g/l. The growth rate of A. niger, glucose consumption, and the formation of citric acid were modeled using 3 equations; i.e. Monod with non-competitive product inhibition, Luedeking-Piret, and Luedeking-Piret growth associated product formation, respectively. The values of kinetic parameters such as μmax, Ks, Kp, were 0.65 hour-1, 157.5 g/l, 0.3 g/l, for initial glucose concentration of 30, 50, 70 g/l, respectively. The values of α (kinetic parameter for growth associated product formation and α would be equal to Yp/x) and Yx/s were 0.4903, 0.8531, 0.9863; 0.5124, 0.2704, 0.2381, for initial glucose concentration of 30, 50, 70 g/l, respectively. Higher initial glucose concentration would increase α but it lowered Yx/s.

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