scholarly journals Studies on the Kinetics of Oxidation of 4-Oxo-4-phenylbutanoic Acid by Benzimidazolium Fluorochromate in the Presence of Oxalic Acid in Acetic Acid-Water Medium

2015 ◽  
Keyword(s):  
Acetic Acid ◽  
Oxalic Acid ◽  
Acid Water ◽  
Water Medium ◽  
Kinetics Of Oxidation ◽  
Acetic Acid Water ◽  
Kinetics Of

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.

Kinetics of Oxidation of Benzaldehydes by Quinolinium Dichromate

2003 ◽  
Vol 58 (12) ◽  
pp. 1201-1205 ◽  
Author(s):  
Hesham A. A. Medien
Keyword(s):  
Acetic Acid ◽  
Sulfuric Acid ◽  
Activation Parameters ◽  
Reaction Rates ◽  
Water Medium ◽  
Kinetics Of Oxidation ◽  
First Order ◽  
Different Temperatures ◽  
Acetic Acid Water ◽  
Kinetics Of

Quinolinium dichromate (QDC) in sulfuric acid oxidizes benzaldehydes to the corresponding acids in a 50% (v/v) acetic acid-water medium. The reaction is first order each in [QDC], [substrate] and [H+]. The reaction rates have been determined at different temperatures and the activation parameters calculated. The rate decreases with an increase in the water content of the medium. The effects of substituents have been studied. A suitable mechanism is proposed.

scholarly journals Cinétique de la formation de la métalloporphyrine Cu(II) – hématoporphyrine IX dans l'acide acétique aqueux

1975 ◽  
Vol 53 (16) ◽  
pp. 2375-2380 ◽  
Author(s):  
Guy Paquette ◽  
Miklos Zador
Keyword(s):  
Acetic Acid ◽  
Reactive Species ◽  
Acid Water ◽  
First Order ◽  
Water Solvent ◽  
Acetic Acid Water ◽  
Kinetics Of ◽  
Hematoporphyrin Ix ◽  
Mechanism Of The Reaction

The kinetics of interaction of hematoporphyrin IX with Cu(II) has been studied in an acetic acid – water solvent (50%–50% v/v). The reaction is of first order with respect to the porphyrin whereas the order with respect to copper(II) perchlorate is smaller than one. This is explained by taking into account the interaction between Cu2+ and acetic acid. The reactive species are Cu2+, CuOAc+, and free porphyrin. The mechanism of the reaction is compared to those proposed for similar systems.

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.%

scholarly journals Kinetic Studies on the Oxidation of Someparaandmeta-Substituted Cinnamic Acids by Pyridinium Bromochromate in the Presence of Oxalic Acid (A Co-oxidation Study)

2009 ◽  
Vol 6 (3) ◽  
pp. 920-927 ◽  
Author(s):  
G. Vanangamudi ◽  
S. Srinivasan
Keyword(s):  
Oxalic Acid ◽  
Activation Parameters ◽  
Kinetic Studies ◽  
Cinnamic Acids ◽  
Kinetics Of Oxidation ◽  
Oxidation Study ◽  
Low Dielectric ◽  
Rate Of Reaction ◽  
Acetic Acid Water ◽  
Kinetics Of

The kinetics of oxidation of cinnamic acids by pyridinium bromochromate (PBC) in the presence of oxalic acid has been studied in acetic acid-water (60:40%) medium. The reaction shows unit order dependence each with respect to oxidant as well as oxalic acid [OX], the order with respect to [H+] and [CA] are fractional. The reaction is acid catalyzed and a low dielectric constant favours the reaction. Increase the ionic strength has no effect on the reaction rate. In the case of substituted cinnamic acids the order with respect to substrate vary depending upon the nature of the substituent present in the ring. In general, the electron withdrawing substituents retard the rate while the electron releasing substituents enhance the rate of reaction. From the kinetic data obtained the activation parameters have been computed and a suitable mechanism has been proposed.

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