Process for producing terephthalic acid of high purity

Details Process for producing terephthalic acid of high purity Process for producing terephthalic acid of high purity

1979-07-02

1981-05-19

Siegel, Alan

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

Organic compounds

Carboxylic acids and salts thereof

562486, 562487, C07C 5116, C07C 5142

Patent

active

042686903

ABSTRACT:
Terephthalic acid of high purity is continuously produced in a high yield by oxidizing p-tolualdehyde with a molecular oxygen-containing gas in the presence of bromine ions as a catalyst in a water solvent, contacting the resulting slurry solution containing crude terephthalic acid with an ascending stream of high temperature water of 180.degree.-320.degree. C., and withdrawing the water solvent together with the ascending stream of high temperature of water upwardly, while settling down crystalline terephthalic acid through the ascending stream of high temperature water and withdrawing the crystalline terephthalic acid together with a portion of the high temperature water downwardly.

REFERENCES:
patent: 2838565 (1958-06-01), Heath et al.
patent: 3522298 (1970-07-01), Bryant et al.
patent: 3678106 (1972-07-01), Ager

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