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:
Feb. 19, 1985
Filed:
Jun. 11, 1982
Jean Gauthier-Lafaye, Lyons, FR;
Robert Perron, Charly, FR;
Rhone-Poulenc Chimie de Base, Courbevoie, FR;
Abstract
Methyl acetate is carbonylated, advantageously to acetic anhydride, in a homogeneous liquid phase, in a virtually anhydrous reaction medium, in the presence of: (a) a cobalt source, (b) a ruthenium source, (c) an ionic iodide of the formula: A.sup.m+ I.sub.m.sup.- in which A.sup.m+ is a nitrogen group quaternary onium cation, an alkali metal or alkaline earth metal cation, or a lanthanide or actinide group metal cation, (c') if appropriate, a carboxylate of the formula: A'.sup.n+ (OCOR).sub.n.sup.-, in which n is 1 or 2 and A'.sup.n+ is defined as was A.sup.m+, with A'.sup.n+ and A.sup.m+ either being the same or different, and R is an alkyl, aralkyl or aryl radical having a maximum of 8 carbon atoms, and (d) hydrogen, the total amount of halogen compounds present in the carbonylation reaction medium (expressed in gram atoms of halogen and designated by X.sub.T) being such that the atomic ratio X.sub.T /(m.A.sup.m+ +n.A'.sup.n+) is less than or equal to 1.