Patent · US Expired

Process for the production of surfactant mixtures based on ether sulfonates and their use

US5318709A · kind A · utility

126Cited by

2References

6Claims

0Family size

Assignee

Henkel Kommanditgesellschaft auf Aktien · DE

Inventors

Willi Wuest · Ratingen, DE
Rainer Eskuchen · Langenfeld, DE
Bernd Richter · Dresden, DE

Key dates

Filing date	Dec 5, 1991
Grant date	Jun 7, 1994
Priority date	—
Expiry date	Dec 5, 2011

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S507/936
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.