Method of manufacturing salt of .alpha.-sulfofatty acid ester

Details Method of manufacturing salt of .alpha.-sulfofatty acid ester Method of manufacturing salt of .alpha.-sulfofatty acid ester

1974-11-18

1976-07-13

Garvin, Patrick P.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260481R, C11D 128, C07C14312

Patent

active

039693759

ABSTRACT:
A neutralized product containing salt of .alpha.-sulfofatty acid ester in high concentration can be produced by the method comprising the steps of (1) sulfonating fatty acid ester by contacting a gaseous mixture of sulfur trioxide (SO.sub.3) and an inert gas containing 1 - 15% by volume of SO.sub.3 with a film of a fatty acid ester, said ester having the formula RCH.sub.2 COOR' (wherein R is alkyl having 8 - 18 carbon atoms and R' is alkyl having 1 - 5 carbon atoms), under the conditions that the molar ratio of SO.sub.3 to said fatty acid ester is in the range of 1.0 - 1.5, the temperature is in the range of 50.degree. - 85.degree.C and the time of contact is in the range of 0.5 - 30 seconds; (2) contacting a film of the reaction product obtained by step (1) into contact with said gaseous mixture, under the conditions of a temperature in the range of 95 - 150.degree.C and a time of contact in the range of 3 - 120 seconds; and (3) instantly neutralizing the reaction product obtained by step (2) with a base selected from the group consisting of an aqueous solution of alkali metal hydroxide, ammonia water and ethanol amine while retaining the condition that the pH value is in the range of 6 - 10 and the temperature is less than 70.degree.C. This neutralized product is usable as the active ingredient a detergent without subjecting it to any further treatment.

REFERENCES:
patent: 3256303 (1966-06-01), Stein et al.
patent: 3328460 (1967-06-01), Van der Mey

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