METHOD OF SEPARATION AND CLEANING OF PARA-AMINOBENZOIC ACID Russian patent published in 2007 - IPC C07C227/40 C07C227/42 C07C229/14

Abstract RU 2304576 C1

FIELD: separation and cleaning of para-aminobenzoic acid.

SUBSTANCE: proposed method consists in increasing the concentration of salts of para-nitrobenzoic acid in reaction mass by obtaining the following ratio of sodium and ammonium salts: Na-salt : NH₄-salt = 7.5-8.0 : 2.5-2.0 mole; acidation of solution of para-aminobenzoic acid is carried out with the aid of nitric acid at concentration of 20-25%. Novelty of invention consists in setting the required ratio of sodium and ammonium salts of para-nitrobenzoic acid and use of nitric acid for separation of para-aminobenzoic acid from solution.

EFFECT: increased productivity of equipment; high concentration of salts of para-nitrobenzoic acid; high purity of target product.

2 cl, 1 tbl, 4 ex

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RU 2 304 576 C1

Authors

Mil'To Vladimir Il'Ich

Plakhtinskij Vladimir Vladimirovich

Dates

2007-08-20—Published

2005-11-09—Filed