PROCESS FOR PREPARING AND/OR PURIFYING AMIDO ACID PHENYL ESTER SULFONATES

WIPO Patent Application WO1999009004

A3

The present invention relates to a process for the preparation of a purified salt of 4-sulfophenyl-[(1-oxyalkanoyl)amino] alkanoate. The process comprises the steps of: (a) providing a source of 4-sulfophenyl-[(1-oxyalkanoyl)amino] alkanoate; (b) admixing the source with a water-based purification system to form a purification mixture, the water-based purification system having water present at a ratio of 4-sulfophenyl-[(1-oxyalkanoyl)amino] alkanoate to water ranging from about 1:0.05 to about 1:50, preferably from about 1:0.1 to about 1:40; (c) separating a purified salt of 4-sulfophenyl-[(1-oxyalkanoyl)amino] alkanoate from the purification mixture; and (d) collecting said purified salt of 4-sulfophenyl-[(1-oxyalkanoyl)amino] alkanoate. In preferred embodiments, the purification mixture includes a processing aide such as ethyl alcohol, propyl alcohol, isopropyl alcohol, acetone and mixtures thereof.

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DYKSTRA ROBERT RICHARD (US)
DUPONT JEFFREY SCOTT (US)
BURNS MICHAEL EUGENE (US)

PCT/US1998/016807

June 03, 1999

August 13, 1998

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PROCTER & GAMBLE (US)
DYKSTRA ROBERT RICHARD (US)
DUPONT JEFFREY SCOTT (US)
BURNS MICHAEL EUGENE (US)

C07C303/32; C07C303/44; C07C309/42; (IPC1-7): C07C303/32; C07C303/44; C07C309/42

WO1994028106A1

1994-12-08

US5466840A

1995-11-14

DATABASE WPI Week 9727, Derwent World Patents Index; AN 97-294933, XP002099572

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