The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 04, 1990
Filed:
Feb. 01, 1989
Rudolf Aigner, Burgkirchen, DE;
Gunther Muller, Burgkirchen, DE;
Rainer Muller, Burghausen, DE;
Horst Reuner, Burghausen, DE;
Hoechst Aktiengesellschaft, Frankfurt am Main, DE;
Abstract
A process for the preparation of sulfated alkanol oxethylates or alkylphenol oxethylates is described. After completion of the reaction with SO.sub.3, 0.1 to 0.5% by weight, relative to the alkanol oxethylates or alkylphenol oxethylates employed, of at least one of the following compounds: water, ethanol, 1-propanol, 2-propanol or n-heptane are admixed to the reaction mixture and liquid and gas are subsequently separated at a temperature of 20.degree. to 60.degree. C. The liquid is then neutralized with aqueous alkali as customary and leads to ether sulfate/water mixtures with considerably reduced contents of 1,4-dioxane which can either be used without further aftertreatment or with a considerably reduced outlay in terms of aftertreatment as personal hygiene agents and for various other purposes.