Process for preparing purified alkali metal salts of 4-sulfophen

Details Process for preparing purified alkali metal salts of 4-sulfophen Process for preparing purified alkali metal salts of 4-sulfophen

1994-08-22

1995-11-14

Dees, Jose G.

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

Organic compounds

Fatty compounds having an acid moiety which contains the...

560 41, 560142, 554 36, 554 68, C07C23100

Patent

active

054668409

ABSTRACT:
This invention relates to a 5 step process for preparing a purified alkali metal salt of 4-sulfophenyl-[(1-oxyalkanoyl)amino]alkanoate in one reaction vessel without isolation of intermediates. The steps are as follows: A) reacting an alkali metal salt of 4-hydroxybenzenesulfonic acid with a C.sub.2 to C.sub.4 carboxylic anhydride in a solvent to form an alkali metal salt of 4-acyloxybenzenesulfonic acid and a C.sub.2 to C.sub.4 carboxylic acid. B) adding an [(1-oxyalkanoyl)amino]alkanoic acid and a transesterification catalyst to the reaction product of step A) and heating at a temperature and pressure sufficient to maintain reflux of the solvent and to remove the C.sub.2 to C.sub.4 carboxylic acid from the reaction vessel to form a reaction mixture containing an alkali metal salt of 4-sulfophenyl-[(1-oxyalkanoyl)amino]alkanoate. C) removing the solvent from the reaction mixture formed in step B). D) mixing the alkali metal salt of 4-sulfophenyl-[(1-oxyalkanoyl)amino]alkanoate product of step C) with acetic acid. E) and finally separating the product from the acetic acid. The purified alkali metal salt of 4-sulfophenyl-[(1-oxyalkanoyl)amino]alkanoate product is useful as a bleach activator in detergents.

REFERENCES:
patent: 4883612 (1989-11-01), Moyne et al.
patent: 4985180 (1991-01-01), Bellis et al.

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