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Sélectivité Catalytique Dans L'oxydation du P-xylène

✍ Scribed by J. Rouchaud; L. Sondengam

Publisher
Wiley (John Wiley & Sons)
Year
2010
Weight
230 KB
Volume
78
Category
Article
ISSN
0037-9646

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✦ Synopsis

P-Xylene (1.9 moles/liter, initially) dissolved in acetic acid has been oxidised by oxygen at 165°C (total pressure: 32 atm; partial pressure of oxygen: 25 atm). The oxidation was catalysed by bromine or by the cobalt naphthenate, or by a mixture of the two catalysts. The conversion of p-xylene was 50%. The distribution of the main products (p-toluic and terephthalic acids) during oxidation corresponds to the consecutive mechanism: p-xylene z ! , p-toluic acid terephthalic acid.

Bromine and cobalt, used separately as catalysts, activate the two steps with the same intensity. The catalytic mixture of bromine with cobalt accelerates the second step much more intensively than the first one.

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