PROCESS FOR MAKING 3-PENTENENITRILE BY HYDROCYANATION OF BUTADIENE

摘要

The invention provides a continuous process for the production of 3- pentenenitrile, comprising: (a) contacting, in a reaction zone, a hydrogen cyanide-containing feed, a butadiene-containing feed, and a catalyst precursor composition, wherein the catalyst precursor composition comprises a zero-valent nickel and at least one bidentate phosphite ligand selected from a member of the group represented by Structures I and II, in which all like reference characters have the same meaning, except as further explicitly limited: wherein R1 and R5 are independently selected from the group consisting of Ci to C5 hydrocarbyl, and R2, R3, R4, Re, R7 and R8 are independently selected from the group consisting of H and C1 to C4 hydrocarbyl; and (b) maintaining a residence time in the reaction zone sufficient to convert about 95% or more of the hydrogen cyanide and to produce a reaction mixture comprising 3-pentenenitrile and 2-methyl-3-butenenitrile, wherein the 2-methyl-3- butenenitrile concentration is maintained below about 15 weight percent of the total mass of the reaction mixture.