Process for the production of surfactant mixtures based on ether sulfonates and their use
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United States of America Patent
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Jun 7, 1994
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N/A
app pub date -
Dec 5, 1991
filing date -
Jun 5, 1989
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Abstract
A process for the production of a surfactant mixture for use in enhanced oil recovery wherein the surfactant mixture comprises an alkyl ether sulfonic acid or salt thereof as a principal constituent and at most a substantially equal quantity of alkoxylated alcohol. The surfactant mixture is prepared by reacting an alkyl ether sulfate with a stoichiometric excess of an alkali metal sulfite solution at about 160.degree. C. to 220.degree. C. under mildly alkaline pH conditions, and then extracting sulfate salt therefrom using a substantially water-insoluble alcohol at a lowered temperature.
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