PENGARUH KONSENTRASI KATALIS ASAM DAN KECEPATAN PENGADUKAN PADA HIDROLISIS SELULOSA DARI AMPAS BATANG SORGUM MANIS

EKUILIBIUM ◽  
2013 ◽  
Vol 12 (1) ◽  
Author(s):  
Enny Kriswiyanti
Keyword(s):  
Hydrochloric Acid ◽  
Sweet Sorghum ◽  
Reaction Rate ◽  
Acid Catalyst ◽  
Agitation Speed ◽  
First Order ◽  
Reaction Rate Constants ◽  
Glucose Levels ◽  
Hydrolysis Of Cellulose ◽  
Hydrolysis Of

<p>Abstract : Sweet sorghum stem residues contains high enough cellulose (36.92%)so it can be<br />hydrolyzed to glucose. In this research, hydrolysis of cellulose is carried out using hydrochloric<br />acid catalyst. This research aims to determine the effect of acid catalyst concentration and<br />agitation speed on the resulting reduction of glucose levels and determine the reaction rate<br />constant of hydrolysis of sweet sorghum stem residues. The observed variables were the<br />concentration of hydrochloric acid catalyst (0.5 N, 1 N, 1.5 N, 2 N) and the agitation speed (150<br />rpm, 200 rpm, 250 rpm, 300 rpm). Glucose samples were analyzed by using the Lane-Eynon<br />method. Data analysis showed the higher concentration of hydrochloric acid (HCl) and the<br />agitation speed, the levels of reduced glucose that is formed is also higher. In this study by<br />assuming a first order reaction, the reaction rate constants obtained at variable concentrations of<br />hydrochloric acid catalyst ranged from 0.0010 to 0.0033 / minute and at agitation speeds variable<br />ranged from 0.0023 to 0.0030 / minute.<br />Keywords : sweet sorghum stem residues, hydrochloric acid, hydrolysis, cellulose</p>

scholarly journals Reaction Kinetics in Conversion Process of Pineapple Leaves into Glucose

REAKTOR ◽  
2018 ◽  
Vol 18 (03) ◽  
pp. 155 ◽  
Author(s):  
Muhaimin Muhaimin ◽  
Beta Wulan Febriana ◽  
Septian Arfan
Keyword(s):  
Sulfuric Acid ◽  
Reaction Kinetics ◽  
Reaction Rate ◽  
Catalyst Concentration ◽  
Acid Catalyst ◽  
Reaction Rate Constant ◽  
First Order ◽  
Glucose Levels ◽  
Hydrolysis Of ◽  
Pineapple Leaves

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 level was on the use of sulfuric acid at a concentration of 0.1 M at a temperature of 120 oC with glucose levels produced between 26.366.039 ppm to 155.510.778 ppm with k = 0.0106/min. Keywords: glucose; hydrolysis; kinetic model; pineapple leaves

scholarly journals Kinetics study the decomposition of the cellulose into cellulose nanocrystals by hydrothermal with hydrochloric acid catalyst

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Zulnazri Zulnazri ◽  
Rozanna Dewi ◽  
Sulhatun Sulhatun ◽  
Nasrun Nasrun
Keyword(s):  
Hydrochloric Acid ◽  
Cellulose Nanocrystals ◽  
Reaction Rate ◽  
Acid Catalyst ◽  
Reaction Rate Constant ◽  
X Ray Diffraction ◽  
Hydrothermal Conditions ◽  
Reaction Rate Constants ◽  
Ft Ir

The aim of this study was to hydrolyzed cellulose nanocrystals as cellulose-based biomass residues from oil palm by using hydrochloric acid under hydrothermal conditions. The characterization of cellulose nanocrystals was determined by FT-IR spectroscopy and X- ray diffraction. The infrared spectroscopy showed there has been a removal of lignin and hemicellulose in the spectrum. Crystallinity which reaches 78.59% was obtained by hydrolysis using hydrochloric acid catalyst 3 mol/L with a reaction time of 1 hour. Based on the graph of -ln CA/CA0 vs. time obtained that Cellulose nanocrystals forming reaction is of first order. The reaction rate constants to the formation of glucose (k2) is greater than the reaction rate constant to the formation of Cellulose nanocrystals (k1), which indicates that the phase of slow reaction is the reaction of the most influential on the overall reaction rate, the reaction of the formation of Cellulose nanocrystals.

HIDROLISA PATI DARI KULIT SINGKONG (VARIABEL RATIO BAHAN DAN KONSENTRASI ASAM)

EKUILIBIUM ◽  
2013 ◽  
Vol 12 (1) ◽  
Author(s):  
Endang Mastuti
Keyword(s):  
Hydrochloric Acid ◽  
Acid Concentration ◽  
Reaction Rate ◽  
Animal Feed ◽  
Economic Value ◽  
Acid Catalyst ◽  
Operating Conditions ◽  
Starch Hydrolysis ◽  
Reaction Rate Constants ◽  
Cassava Peel

<p>Abstract: Cassava peel is generally used as animal feed and sometimes just thrown away. To<br />increase the economic value of cassava peels used as alternative materials to manufacture<br />glucose by hydrolysis. This study aims to determine the effect of material and the concentration<br />ratio of acid to the peel of cassava starch hydrolysis of the resulting reduction of glucose and<br />starch hydrolysis reaction rate constants of the cassava peel with hydrochloric acid catalyst.<br />Variables remained in the study was 250 ml volume of cooking and temperature 95<br />C (boiling<br />temperature). Variable is the ratio of materials that were reviewed (30 gr, 40 gr, 50 gr and 60 gr)and acid concentration (0.05 N, 0.1 N; 0.15 N; and 0.2 N). Glucose samples were analyzed by<br />using the Lane-Eynon. Data analysis showed the material and the larger the ratio of acid<br />concentration, the glucose formed higher. So also with increasing reaction time, glucose is<br />formed also higher. Operating conditions which result in maximum glucose in the ratio 5:1<br />material and acid concentration 0.2 N. In this study the reaction of first order reaction rate<br />constants obtained in ratio of materials from 0.0116 to 0.0172/min and at variable acid<br />concentrations from 0.0157 to 0.0252/min.<br />Keywords: Cassava peel, hydrolysis, hydrochloric acid<br />o</p>

The Effect of Dicarboxylic Acid Catalyst Structure on Hydrolysis of Cellulose Model Compound D-Cellobiose in Water

2021 ◽  
Vol 08 ◽  
Author(s):  
Harshica Fernando ◽  
Ananda S. Amarasekara
Keyword(s):  
Dicarboxylic Acid ◽  
Model Compound ◽  
Acid Catalyst ◽  
Catalytic Activities ◽  
Polycarboxylic Acids ◽  
Hydrolysis Of Cellulose ◽  
Phthalic Acids ◽  
Turn Over Frequency ◽  
Turn Over ◽  
Hydrolysis Of

Background: Polycarboxylic acids are of interest as simple mimics for cellulase enzyme catalyzed depolymerization of cellulose. In this study, DFT calculations were used to investigate the effect of structure on dicarboxylic acid organo-catalyzed hydrolysis of cellulose model compound D-cellobiose to D-glucose. Methods: Binding energy of the complex formed between D-cellobiose and acid (Ebind), as well as glycosidic oxygen to dicarboxylic acid closest acidic H distance were studied as key parameters affecting the turn over frequency of hydrolysis in water. Result: α-D-cellobiose - dicarboxylic acid catalyst down face approach showed high Ebind values for five of the six acids studied; indicating the favorability of down face approach. Maleic, cis-1,2-cyclohexane dicarboxylic, and phthalic acids with the highest catalytic activities showed glycosidic oxygen to dicarboxylic acid acidic H distances 3.5-3.6 Å in the preferred configuration. Conclusion: The high catalytic activities of these acids may be due to the rigid structure, where acid groups are held in a fixed geometry.

Hydrolysis of Cellulose by a Solid Acid Catalyst under Optimal Reaction Conditions

2009 ◽  
Vol 113 (8) ◽  
pp. 3181-3188 ◽  
Author(s):  
Daizo Yamaguchi ◽  
Masaaki Kitano ◽  
Satoshi Suganuma ◽  
Kiyotaka Nakajima ◽  
Hideki Kato ◽  
...  
Keyword(s):  
Solid Acid ◽  
Solid Acid Catalyst ◽  
Acid Catalyst ◽  
Reaction Conditions ◽  
Hydrolysis Of Cellulose ◽  
Hydrolysis Of ◽  
Optimal Reaction

Kinetics of the Ozonation of Tetrabromobisphenol-A in Wastewater

2011 ◽  
Vol 383-390 ◽  
pp. 2945-2950 ◽  
Author(s):  
Jie Zhang ◽  
Shi Long He ◽  
Mei Feng Hou ◽  
Li Ping Wang ◽  
Li Jiang Tian
Keyword(s):  
Rate Constants ◽  
Apparent Rate Constant ◽  
Reaction Rate ◽  
Batch Reactor ◽  
Kinetic Studies ◽  
Tetrabromobisphenol A ◽  
First Order ◽  
Reaction Rate Constants ◽  
Pseudo First Order ◽  
Kinetics Of

The kinetics of TBBPA degradation by ozonation in semi-batch reactor was studied. The reaction rate constants of TBBPA with O3 and •OH were measured by means of direct ozone attack and competition kinetics, and the values of which were 6.10 l/(mol•s), 4.8×109 l/(mol•s), respectively. Results of kinetic studies showed that TBBPA degradation by ozonation under the different conditions tested followed the pseudo-first-order. The values of apparent rate constant of TBBPA degradation increased with the increase of ozone dosage and pH, but decreased with the increase of initial TBBPA concentration.

scholarly journals Sulfonic-acid-functionalized carbon fiber from waste newspaper as a recyclable carbon based solid acid catalyst for the hydrolysis of cellulose

RSC Advances ◽  
2019 ◽  
Vol 9 (50) ◽  
pp. 28902-28907 ◽  
Author(s):  
Runming Gong ◽  
Zihao Ma ◽  
Xing Wang ◽  
Ying Han ◽  
Yanzhu Guo ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
Sulfonic Acid ◽  
Solid Acid ◽  
Solid Acid Catalyst ◽  
Acid Catalyst ◽  
Cellulosic Materials ◽  
Hydrolysis Of Cellulose ◽  
Hydrolysis Of ◽  
Carbon Based

Waste newspaper is one of the most common cellulosic materials.

scholarly journals Kinetic analysis of myoglobin autoxidation by isoelectric-focusing electrophoresis

1981 ◽  
Vol 193 (1) ◽  
pp. 181-185 ◽  
Author(s):  
A Tomoda ◽  
T Takizawa ◽  
A Tsuji ◽  
Y Yoneyama
Keyword(s):  
Isoelectric Focusing ◽  
Superoxide Anion ◽  
Reaction Rate ◽  
Ph Dependence ◽  
Acid Base ◽  
First Order ◽  
Reaction Rate Constants ◽  
Ph Values ◽  
Ph Dependent ◽  
Three State Model

The autoxidation of horse myoglobin was studied in the presence or absence of catalase (EC 1.11.1.6) and/or superoxide dismutase (EC 1.15.1.1) at various pH values (6.6-7.8). Changes in the percentages of oxymyoglobin and metmyoglobin during the reaction were analysed by means of isoelectric focusing on Ampholine gel plates. Oxymyoglobin was decreased in a first-order manner, with an accompanying increase in metmyoglobin, under the various conditions studied. The observed reaction rate constants obtained under these conditions were pH-dependent; however, they were also greatly affected by the presence of the enzymes. The pH-dependence of the overall reaction was explained by the acid-base three-state model of myoglobin proposed by Shikama & Sugawara [(1978) Eur. J. Biochem. 91, 407-413]. The reaction process of myoglobin autoxidation was explained by the model suggested by Winterbourn, McGrath & Carrell [(1976) Biochem. J. 155, 493-502], indicating that superoxide anion and hydrogen peroxide are involved in the reaction mechanism.

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