Process for stabilizing carbonylation catalyst in soluble form

Details Process for stabilizing carbonylation catalyst in soluble form Process for stabilizing carbonylation catalyst in soluble form

C - Chemistry, Metallurgy

07

C

260/529.4

C07C 53/08 (2006.01)

Patent

CA 1180724

ABSTRACT OF THE DISCLOSURE The present invention provides for an improved process wherein an olefin, an alcohol, or an ester, halide or ether derivative of said alcohol is reacted with carbon monoxide in a liquid phase in the presence of a catalyst system that contains (a) a rhodium component, and (b) an iodine or bromine component. By passing at least a portion of the liquid reaction mass from the reaction zone to a separation zone of substantially lower CO partial pressure, at least a portion of the carbonylation products, as well as unreacted carbon monoxide, inert gases, and unreacted olefin, alcohol, or alcohol derivative are vaporized and can be withdrawn from the separation zone. Precipitation of the rhodium catalyst under carbon monoxide deficient conditions is prevented or retarded by addition to the sys- tem of a stabilizer which is a substituted diphosphine having the formula Image wherein R1, R2, R4 and R5 are alkyl or aryl substituted alkyl radicals having 1 to 20 carbon atoms or in which Rl, R2, R4 and R5 are aryl or alkyl substituted aryl radicals having 6 to 20 carbon atoms; and R3 is a polymethylene group having 1-3 carbon atoms.

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