Production of p-aminobenzoic acid

Details Production of p-aminobenzoic acid Production of p-aminobenzoic acid

1974-03-13

1976-01-06

Weinberger, Lorraine A.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07C10156

Patent

active

039312100

ABSTRACT:
A two-stage process for producing para-aminobenzoic acid by first reacting certain lower alkyl or glycol monoesters of terephthalic acid or specific salts thereof or mixtures thereof with ammonia in liquid phase at elevated temperatures and pressures to obtain a terephthalic acid monoamide intermediate, removing substantially all ammonia from this intermediate and then converting it into the para-aminobenzoic acid product by the Hofmann reaction, preferably using a sodium hypochlorite solution. The para-aminobenzoic acid, either as the free acid or in the form of its salts or esters is a known product having many uses.

REFERENCES:
theilheimer, W. Synthetic Methods of Organic Chemistry, Vol. 7, (1953), Pub. by S. Karger -N.Y. p. 198 Relied on.
Theilheimer, W. Synthetic Methods of Organic Chemistry, Vol. 11 (1957) Pub. by S. Karger -N.Y. p. 249 Relied on.

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