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Abstract

A process for preparing light-colored aqueous surfactant compositions containing 10% by weight to 60% by weight, based on the total composition, of one or more alpha-sulfo fatty acid disalts (A) of general formula (I),

description='In-line Formulae' end='lead'R¹CH(SO₃M¹)COOM²  (I),description='In-line Formulae' end='tail'

in which radical R1 is a linear or branched alkyl or alkenyl radical having 6 to 18 carbon atoms and radicals M1 and M2, independently, are selected from the group comprising H, Li, Na, K, Ca/2, Mg/2, ammonium, and alkanolamines, and water,in which fatty acids of the general formula (Ia),R2CH2COOH  (Ia)in which radical R2 is a linear or branched alkyl or alkenyl radical having 6 to 18 carbon atoms,(i) are subjected to sulfonation with gaseous sulfur trioxide,(ii) the acidic sulfonation product is neutralized, and then(iii) is subjected to bleaching with hydrogen peroxide at a pH above 7 in a temperature range of 80 to 95° C. in the presence of 50 to 500 ppm, based on the total composition of a stabilizer selected from the group comprising magnesium oxide, magnesium salts, water glass, nitrilotriacetic acid, ethylenediaminetetraacetic acid, gluconic acid, and salts thereof.

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