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:
May. 30, 1978
Filed:
Sep. 30, 1976
Horst Staendeke, Bruhl, DT;
Hubert Neumaier, Hurth, DT;
Hoechst Aktiengesellschaft, Frankfurt am Main, DT;
Abstract
Production of dialkylphosphine oxides of the general formula: ##STR1## in which R.sup.1 and R.sup.2 each stand for an alkyl group having from 1 to 4 carbon atoms by subjecting a dialkylchlorophosphine of the general formula: ##STR2## in which R.sup.1 and R.sup.2 have the meanings given above, or an addition product thereof with hydrogen chloride, to alcoholysis with an aliphatic C.sub.1 - C.sub.4 alcohol in the presence of a protective gas at temperatures between -30.degree. and +30.degree. C, and subjecting the resulting alcoholysate to thermolysis. The compounds are more specifically produced by continuously adding the dialkylchlorophosphine component to the alcohol; subjecting the resulting alcoholysate to thermolysis in a heated separation zone; introducing into the separation zone, countercurrently to the alcoholysate, 10 to 150 l/h of a protective gas, per liter of alcoholysate; removing simultaneously from the separation zone the gaseous thermolysis products and, separately from said products, an alcoholic solutions containing desirable final product; neutralizing the alcoholic solution and recovering the final product from said solution in known manner.