Electrochemical process for the manufacture of terephthalic acid

Details Electrochemical process for the manufacture of terephthalic acid Electrochemical process for the manufacture of terephthalic acid

1977-03-10

1978-05-30

Edmundson, F.C.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

204 72, 204 78, 260515P, C25B 300, C07C 5108, C07C 6326, C07C 6328

Patent

active

040922308

ABSTRACT:
A process for making terephthalic acid which comprises electrolyzing an aqueous solution of potassium acid terephthalate, preferably in the presence of a potassium salt of an acid stronger than terephthalic acid. In another embodiment of the invention terephthalonitrile is converted to terephthalic acid by hydrolyzing terephthalonitrile in an aqueous medium containing dipotassium terephthalate, potassium bicarbonate, and potassium hydroxide, stripping ammonia and carbon dioxide from the hydrolyzed product, adding carbon dioxide to the stripped hydrolysis product to precipitate monopotassium terephthalate, and electrolyzing said monopotassium terephthalate in the presence of an acid stronger than terephthalic acid to precipitate terephthalic acid and separating said terephthalic acid product.

REFERENCES:
patent: 2770588 (1956-11-01), Okada et al.
patent: 3086928 (1963-04-01), Schultz
patent: 3113964 (1963-12-01), Farkas et al.
patent: 3393220 (1968-07-01), Winnick et al.
patent: 3411998 (1968-11-01), Wallman et al.
patent: 3781343 (1973-12-01), Norton
patent: 3849243 (1974-11-01), Grot
patent: 3968017 (1976-07-01), Canata et al.
Basic Principles Organic Chemistry by Roberts et al., p. 558, pub. by Benjamin, New York, 1965.

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