Kinetic studies on acid hydrolysis of Meranti wood sawdust for xylose production

2012 ◽  
Vol 71 ◽  
pp. 431-437 ◽  
Author(s):  
I.S.M. Rafiqul ◽  
A.M. Mimi Sakinah
Keyword(s):  
Acid Hydrolysis ◽  
Kinetic Studies ◽  
Wood Sawdust ◽  
Xylose Production ◽  
Hydrolysis Of

scholarly journals Kinetic studies on the acid hydrolysis of the methyl ketoside of unsubstituted and O-acetylated N-acetylneuraminic acid

1973 ◽  
Vol 133 (4) ◽  
pp. 623-628 ◽  
Author(s):  
A. Neuberger ◽  
Wendy A. Ratcliffe
Keyword(s):  
Sialic Acid ◽  
Acid Hydrolysis ◽  
Model Compound ◽  
Kinetic Studies ◽  
Order Rate Constant ◽  
Neuraminic Acid ◽  
Acetylneuraminic Acid ◽  
Rate Of Hydrolysis ◽  
Ph Range ◽  
Hydrolysis Of

The hydrolysis of the model compound 2-O-methyl-4,7,8,9-tetra-O-acetyl-N-acetyl-α-d-neuraminic acid and neuraminidase (Vibrio cholerae) closely resembled that of the O-acetylated sialic acid residues of rabbit Tamm–Horsfall glycoprotein. This confirmed that O-acetylation was responsible for the unusually slow rate of acid hydrolysis of O-acetylated sialic acid residues observed in rabbit Tamm–Horsfall glycoprotein and their resistance to hydrolysis by neuraminidase. The first-order rate constant of hydrolysis of 2-methyl-N-acetyl-α-d-neuraminic acid by 0.05m-H2SO4 was 56-fold greater than that of 2-O-methyl-4,7,8,9-tetra-O-acetyl-N-acetyl -α-d-neuraminic acid. Kinetic studies have shown that in the pH range 1.00–3.30, the observed rate of hydrolysis of 2-methyl-N-acetyl-α-d-neuraminic acid can be attributed to acid-catalysed hydrolysis of the negatively charged CO2− form of the methyl ketoside.

Kinetic studies of two-stage sulphuric acid hydrolysis of sugarcane bagasse

2015 ◽  
Vol 83 ◽  
pp. 850-858 ◽  
Author(s):  
Sachin Kumar ◽  
Pratibha Dheeran ◽  
Surendra P. Singh ◽  
Indra M. Mishra ◽  
Dilip K. Adhikari
Keyword(s):  
Acid Hydrolysis ◽  
Sulphuric Acid ◽  
Sugarcane Bagasse ◽  
Kinetic Studies ◽  
Two Stage ◽  
Hydrolysis Of

scholarly journals Oxidation–reduction reactions of simple hydroxamic acids and plutonium(IV) ions in nitric acid

2008 ◽  
Vol 96 (6) ◽  
Author(s):  
M. J. Carrott ◽  
O. D. Fox ◽  
G. LeGurun ◽  
C. J. Jones ◽  
C. Mason ◽  
...  
Keyword(s):  
Acid Hydrolysis ◽  
Kinetic Studies ◽  
Hydroxamic Acids ◽  
Single Cycle ◽  
Fuel Cycles ◽  
Oxidation Reduction ◽  
Advanced Fuel ◽  
Extraction Processes ◽  
The Stability ◽  
Hydrolysis Of

SummarySimple hydroxamic acids such as formo- and aceto-hydroxamic acids have been proposed as suitable reagents for the separation of either Pu and/or Np from U in modified or single cycle Purex based solvent extraction processes designed to meet the emerging requirements of advanced fuel cycles. The stability of these hydroxamic acids is dominated by their decomposition through acid hydrolysis. Kinetic studies of the acid hydrolysis of formo- and aceto-hydroxamic acids are reported in the absence and the presence of Pu(IV) ions. The slow reduction of these plutonium(IV) hydroxamate complexes to Pu(III) aquo-ions has been characterised by spectrophotometry and cyclic voltammetry. The reductions of Pu(IV) in the presence of FHA and AHA are consistent with a mechanism in which free hydroxamic acid in solution is hydrolysed whilst Pu(IV) ions remain fully complexed to hydroxamate ligands; then at some point close to a 1 : 1 Pu(IV) : XHA ratio, some free Pu

scholarly journals Influence of solid loading on D-xylose production through dilute sulphuric acid hydrolysis of olive stones

2015 ◽  
Vol 66 (3) ◽  
pp. e084 ◽  
Author(s):  
S. Sánchez ◽  
M. Cuevas ◽  
M. Saleh ◽  
J. F. García-Martín
Keyword(s):  
Acid Hydrolysis ◽  
Sulphuric Acid ◽  
Solid Loading ◽  
Olive Stones ◽  
Xylose Production ◽  
Hydrolysis Of

scholarly journals Kinetic Study of Acid Hydrolysis of Rice Straw

2013 ◽  
Vol 2013 ◽  
pp. 1-5 ◽  
Author(s):  
Nibedita Sarkar ◽  
Kaustav Aikat
Keyword(s):  
Reaction Time ◽  
Acid Hydrolysis ◽  
Rice Straw ◽  
Main Product ◽  
Value Added ◽  
Dilute Acid ◽  
Dilute Acid Hydrolysis ◽  
Xylose Production ◽  
Hydrolysis Of ◽  
Value Added Products

Rice straw is a renewable, cheap, and abundant waste in tropical countries. The pentose content of rice straw can be used as a substrate for many types of value-added products such as xylitol and biofuel. Dilute acid hydrolysis mainly releases pentose from rice straw. The objective of the study was to determine the effect of H2SO4 concentration and reaction time on the xylose production. The variation of the main product xylose with the reaction time was described by a kinetic model and kinetic parameters were calculated to describe the variation of the xylose production with time. The optimum yield (19.35 g/L) was obtained at 0.24 mol/L H2SO4 and 30 minutes.

Thiohydantoins. X. Kinetic Studies of the Acid Hydrolysis of 1-Acyl-2-thiohydantoins

1972 ◽  
Vol 50 (23) ◽  
pp. 3767-3779 ◽  
Author(s):  
Wayne Irvine Congdon ◽  
John Thomas Edward
Keyword(s):  
Sulfuric Acid ◽  
Carboxylic Acid ◽  
Acid Hydrolysis ◽  
Kinetic Studies ◽  
Steric Effects ◽  
Aqueous Sulfuric Acid ◽  
Hydrolysis Of

The rates of hydrolysis of 22 1-acyl-2-thiohydantoins in aqueous sulfuric acid to give 2-thiohydantoin and a carboxylic acid have been determined. In 0–90% sulfuric acid, hydrolysis takes place by an A-2 mechanism, and the rate reaches a maximum in about 70% acid. In acid more concentrated than about 90%, hydrolysis takes place by an A-1 mechanism, and the rate increases monotonically. Evidence for the two mechanisms comes from Yates r and Bunnett-Olsen [Formula: see text] parameters; from entropies of activation; from pσ and pσ+ relations; and from steric effects.

The Acid Hydrolysis of Egg Albumin. I. Kinetic Studies

1948 ◽  
Vol 70 (6) ◽  
pp. 2128-2131 ◽  
Author(s):  
Henry B. Bull ◽  
J. Wilfrid Hahn
Keyword(s):  
Acid Hydrolysis ◽  
Kinetic Studies ◽  
Egg Albumin ◽  
Hydrolysis Of
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