Process for continuous production of high purity terephthalic ac

Details Process for continuous production of high purity terephthalic ac Process for continuous production of high purity terephthalic ac

1978-10-20

1983-01-25

Siegel, Alan

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acids and salts thereof

562412, 562416, C07C 5142, C07C 5116

Patent

active

043704964

ABSTRACT:
A process for continuously producing high purity terephthalic acid, in particular, useful for direct polymerization, which comprises continuously introducing p-dialkylbenzene as a feed material together with a solvent and an oxidation catalyst into a reactor, subjecting the p-dialkylbenzene to a liquid phase oxidation with oxygen in the reactor to produce terephthalic acid, continuously or intermittently introducing the reaction mixture containing terephthalic acid thus produced into a stabilizer, and oxidizing the reaction mixture in the stabilizer for an extended period of time with a molecular oxygen containing gas of a low oxygen concentration at a temperature and pressure the same as or lower than those in the oxidation reaction while keeping the volume change of the contents in the stabilizer below about 30% by volume of the contents of the stabilizer.

REFERENCES:
patent: 3859344 (1975-01-01), Shigeyasu et al.

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