Selective oxidation of p-chlorotoluene with Co(OAc)2/MnSO4/KBr in acetic acid–water medium

2007 ◽  
Vol 8 (8) ◽  
pp. 1279-1283 ◽  
Author(s):  
An-Jun Hu ◽  
Chun-Xu Lü ◽  
Hai-Ying Wang ◽  
Bin-Dong Li
Keyword(s):  
Acetic Acid ◽  
Selective Oxidation ◽  
Acid Water ◽  
Water Medium ◽  
Acetic Acid Water

scholarly journals Numerical Optimization of the Process of Cellulose Isolation by Peroxide Delignification of Birch Wood in Acetic Acid-Water Medium in the Presence of TiO₂ Catalyst

2021 ◽  
Vol 14 (1) ◽  
pp. 120-132
Author(s):  
Natalya V. Garyntseva ◽  
◽  
Irina G. Sudakova ◽  
Anna I. Chudina ◽  
Boris N. Kuznetsov
Keyword(s):  
Acetic Acid ◽  
Numerical Optimization ◽  
Acid Water ◽  
Process Conditions ◽  
Water Medium ◽  
Cellulose Content ◽  
Birch Wood ◽  
Optimal Conditions ◽  
Acetic Acid Water ◽  
Peroxide Delignification

The possibility of isolation of high-quality cellulose by peroxide delignification of birch wood in an acetic acid-water medium in the presence of a TiO2 catalyst at a temperature of 100 °C was shown. The influence of the process conditions (concentration of hydrogen peroxide and acetic acid, liquid/wood ratio (LWR)) on the yield and composition of cellulose products was established. Numerical optimization of the process was carried out using a full factorial experiment. The optimal conditions for isolation from birch wood a cellulose product with residual lignin content of ≤ 1 wt.% are: СН3СООН concentration 23.8 wt.%, Н2О2 concentration 4.9 wt.%, LWR14.9, temperature 100 °C, time 4 h. Under these optimal conditions, the yield of a cellulose product with a cellulose content of 92.5 wt.% was 49.9 wt.%

Kinetics of oxidation of α,β-unsaturated aldehydes by quinolinium dichromate

2003 ◽  
Vol 81 (3) ◽  
pp. 204-208 ◽  
Author(s):  
Girija S Chaubey ◽  
Simi Das ◽  
Mahendra K Mahanti
Keyword(s):  
Acetic Acid ◽  
Sulfuric Acid ◽  
Kinetic Data ◽  
Acid Water ◽  
Water Medium ◽  
Kinetics Of Oxidation ◽  
Unsaturated Aldehydes ◽  
Mechanistic Pathway ◽  
Acetic Acid Water ◽  
Kinetics Of

A series of α,β-unsaturated aldehydes (crotonaldehyde, cinnamaldehyde, acrylaldehyde, and methacrylaldehyde) were oxidized by quinolinium dichromate in sulfuric acid to the corresponding acids in 50% (v/v) acetic acid – water medium. The kinetic data have been discussed with reference to the aldehyde hydration equilibria. The kinetic results support a mechanistic pathway proceeding via a rate-determining oxidative decomposition of the chromate ester of the aldehyde hydrate.Key words: kinetics, oxidation, unsaturated aldehydes, quinolinium dichromate.

Liquid Structure of Acetic Acid−Water and Trifluoroacetic Acid−Water Mixtures Studied by Large-Angle X-ray Scattering and NMR

2007 ◽  
Vol 111 (31) ◽  
pp. 9270-9280 ◽  
Author(s):  
Toshiyuki Takamuku ◽  
Yasuhiro Kyoshoin ◽  
Hiroshi Noguchi ◽  
Shoji Kusano ◽  
Toshio Yamaguchi
Keyword(s):  
Acetic Acid ◽  
Trifluoroacetic Acid ◽  
Large Angle ◽  
Liquid Structure ◽  
Acid Water ◽  
X Ray ◽  
X Ray Scattering ◽  
Acetic Acid Water ◽  
Ray Scattering
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