Continuous manufacture of anthranilic acid

Details Continuous manufacture of anthranilic acid Continuous manufacture of anthranilic acid

1979-03-28

1980-11-11

Trousof, Natalie

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

Organic compounds

Carboxylic acids and salts thereof

C07C 9900, C07C 9912

Patent

active

042334594

ABSTRACT:
Anthranilic acid is manufactured continuously by reacting an alkali metal phthalamate and/or phthalimidate with an alkali metal hypohalite in a reaction tube, the resulting anthranilic acid being treated, during or after the reaction, with reducing agents in two steps, the reducing agents employed in the two steps being different from one another, and an alkali metal dithionite or alkali metal formaldehyde-sulfoxylate being used as the reducing agent in the second treatment step. The product is a starting material for the preparation of dyes, crop protection agents and scents.

REFERENCES:
patent: 3322820 (1967-05-01), Lehmann et al.
patent: 3847974 (1974-11-01), Sturm et al.
patent: 4082749 (1978-04-01), Juergen et al.
Ullmanns Encyklopadie der technischen Chemie (4th edn.), vol. 8, p. 375.

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