Process for preparing tenside mixtures based on ether...

Details Process for preparing tenside mixtures based on ether... Process for preparing tenside mixtures based on ether...

C - Chemistry, Metallurgy

07

C

C07C 303/02 (2006.01) C07C 303/32 (2006.01) C07C 309/09 (2006.01) C09K 8/584 (2006.01) E21B 43/22 (2006.01)

Patent

CA 2058761

ABSTRACT In a process for preparing tenside mixtures based on alkyl ether sulphonates or their salts (ether sulphonates) as the main component and which are particularly suitable for use in tertiary crude oil extraction, alkyl ether sulphates are reacted with an aqueous solution of an alkali sulphate at temperatures of 160°C to 220°C. To prepare admixtures of the ether sulphonates based on alkoxylated alcohols of natural and/or synthetic origin and which are essentially free from sulphate salts, not more than approximately equal quantities of the alkoxylated alcohols are reacted in aqueous medium of weakly alkaline pH with a stoichiometric excess of alkali sulphate and, if necessary, allowed to further react, preferably under the specified reaction conditions. The resultant tenside mixture is then extracted with at least essentially water-insoluble alcohols at lower, but still high, temperatures. The tenside mixtures obtained can be used, in particular admixed with residual alcohol from the extraction stage, for tertiary crude oil extraction.

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