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:
Jul. 18, 1978
Filed:
Jun. 24, 1977
Klaus Gehrmann, Erftstadt, DE;
Alexander Ohorodnik, Erftstadt, DE;
Karl-Heinz Steil, Hurth, DE;
Stefan Schafer, Bruhl, DE;
Hoechst Aktiengesellschaft, Frankfurt am Main, DE;
Abstract
Methyldichlorophosphane is made by reacting methane with phosphorus trichloride in contact with carbon tetrachloride at temperatures higher than 500.degree. C. To this end, the starting reactant mixture is admixed with 2 to 7 mol % of reaction-initiating carbon tetrachloride, based on phosphorus trichloride; the carbon tetrachloride is reacted to an extent of 50 to 80% by varying the reaction temperature within the range 550.degree. to 650.degree. C for constant residence times of 0.1 to 0.9 second; and resulting reaction mixture containing a residual analytically detectable 20 to 50% proportion of the carbon tetrachloride used is condensed out.