Continuous preparation of anthranilic acid

Details Continuous preparation of anthranilic acid Continuous preparation of anthranilic acid

1979-01-10

1981-06-30

Breitenstein, G. T.

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

Organic compounds

Carboxylic acids and salts thereof

C07C10154

Patent

active

042764335

ABSTRACT:
A process for the continuous preparation of anthranilic acid by a two-stage reaction of an alkali metal phthalamate and/or an alkali metal phthalimidate with an alkali metal hypohalite, the first stage being carried out substantially adiabatically and both stages being carried out at high flow rates and different temperatures, wherein first the phthalimide and/or phthalamic acid is dissolved in a defined excess amount of alkali metal hydroxide solution and the solution is only then mixed, and reacted, with the hypohalite, without further addition of excess alkali. The products are starting materials for the preparation of dyes and scents.

REFERENCES:
patent: 1322052 (1919-11-01), Potter
patent: 2653971 (1953-09-01), Balch et al.
patent: 3322820 (1967-05-01), Lehmann et al.
patent: 3847974 (1974-11-01), Sturm et al.
patent: 4082749 (1978-04-01), Quadbeck-Seeger et al.
Zabicky, The Chemistry of Amides, Interscience Publishers, N.Y., pp. 816-847, 1970.

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