PROCESS FOR PRODUCING TEREPHTALOIC ACID

Terephthalic acid is prepared by oxidation of p-xylene, in the presence of an oxidation catalyst. The process consists in passing a gas containing molecular oxygen into a liquid mixture comprising p-xylene, p-toluic acid and water, in which the p-toluic acid:p-xylene molar ratio is between 0.01 and...

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Bibliographische Detailangaben
1. Verfasser:	HANOTIER,JACQUES,D.,V.,BE
Format:	Patent
Sprache:	eng
Schlagworte:	ACYCLIC OR CARBOCYCLIC COMPOUNDS APPARATUS THEREFOR CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY CHEMISTRY GENERAL METHODS OF ORGANIC CHEMISTRY METALLURGY ORGANIC CHEMISTRY PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL THEIR RELEVANT APPARATUS TRANSPORTING
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Beschreibung
Zusammenfassung:	Terephthalic acid is prepared by oxidation of p-xylene, in the presence of an oxidation catalyst. The process consists in passing a gas containing molecular oxygen into a liquid mixture comprising p-xylene, p-toluic acid and water, in which the p-toluic acid:p-xylene molar ratio is between 0.01 and 100 and the water:p-toluic acid molar ratio is between 0.4 and 60, this mixture containing, as oxidation catalyst, a cobalt or manganese salt, or a mixture of such salts. Terephthalic acid is thus obtained with a high yield and a good purity, avoiding the use and the consumption of a lower fatty acid as solvent and using equipment of conventional type made of stainless steel.