Process for making sulfonated fatty acid alkyl ester surfactant

Details Process for making sulfonated fatty acid alkyl ester surfactant Process for making sulfonated fatty acid alkyl ester surfactant

1993-12-16

1995-12-12

Raymond, Richard L.

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

Organic compounds

Carboxylic acid esters

252549, 252550, 252551, 252552, 252554, 558 60, C07C30904

Patent

active

054751349

ABSTRACT:
An improved process for the production of sulfonated fatty acid alkyl ester surfactants containing low levels of impurities including disalt and dimethyl sulfate (DMS) impurities, said process comprising sulfonating fatty acid alkyl esters, forming a substantially anhydrous alkoxide solution, over-neutralizing to a pH of at least about 10 with the alkoxide solution, and re-neutralizing to a pH of about 5 to about 9. The substantially anhydrous alkoxide solution is formed by combining an alkoxide solution containing an alkoxide of the formula (RO.sup.-).sub.n M.sup.n+, a C.sub.1 to C.sub.8 alcohol, and no more than 1% by weight water with a sacrificial ester of the formula R.sup.1 COOR.sup.2, wherein the molar ratio of the sacrificial ester to water is from about 0.5:1 to about 2:1.

REFERENCES:
patent: 3954643 (1976-05-01), Krings et al.
patent: 4253993 (1981-03-01), Ramsey, III et al.
patent: 4404143 (1983-09-01), Sekiguchi et al.
patent: 4416809 (1983-11-01), Magari et al.
Chemical Abstract, "Production of alpha-Sulfofatty Acid Ester Salt" JP890113423, May 1, 1989 and JP2290842, Nov. 30, 1990.
W. Stein and H. Baumann, ".alpha.-Sulfonated Fatty Acids and Esters: Manufacturing Process, Properties, and Applications"m Apr. 1974, pp. 323-329.

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