PROCESS FOR THE PREPARATION OF TEREPHTHALIC ACID

Details PROCESS FOR THE PREPARATION OF TEREPHTHALIC ACID PROCESS FOR THE PREPARATION OF TEREPHTHALIC ACID

1971-09-07

1976-03-16

Weinberger, Lorraine A.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07C 6326, C07C 5142

Patent

active

039446026

ABSTRACT:
An after-treatment or purification process for oxidation products produced by the air oxidation of a mixture of p-toluic acid methyl ester and p-xylene to provide terephthalic acid wherein the oxidation products are heated to an elevated temperature under pressure and a substance such as p-xylene, water, a lower carboxylic acid containing from 1 - 4 carbon atoms and mixtures thereof is added thereto. Subsequently, the desired terephthalic acid is separated from the resultant reaction mixture.

REFERENCES:
patent: 2572710 (1951-10-01), Emerson
patent: 2894978 (1959-07-01), Katzschmann
patent: 3171856 (1965-03-01), Kurtz
patent: 3364256 (1968-01-01), Ichikawa et al.

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