Patent ID: 6388160
Filing Date: 2002-05-14
Classification: B01J,C07C

Abstract:
A method for producing 2,3-dimethylbutene-1 and 2,3-dimethylbutene-2, comprising the steps of(a) dimerizing propylene in a propylene-dimerization step using a nickel complex catalyst as described below as a propylene-dimerization catalyst having propylene-dimerization activity and 2,3 dimethylbutene-1 selectivity, (b) rectifying the resulting reaction solution to obtain 2,3-dimethylbutene-1 as a distillate and a distillation residue containing 2,3-dimethylbutene-1 in a 2,3-dimethylbutene-1 distillation step, (c) allowing the distillation residue to contact with sulfuric acid, sulfonic acid or hetetopolyacid to isomerize 2,3-dimethylbutene-1 in said distillation residue into 2,3-dimethylbutene-2 in an isomerization step, and (d) rectifying the resulting isomerization reaction solution to obtain 2,3-dimethylbutene-2 in a 2,3-dimethylbutene-2 distillation step, wherein said nickel complex catalyst comprising (A) at least one nickel compound selected from a nickel salt of an organic or inorganic acid and a complex compound of nickel, (B) a trialkylaluminum, (C) a trivalent phosphorus compound of formula (1): PR1R2R3 â€ƒâ€ƒ(1) â€ƒwherein, R1, R2 and R3 are the same or different and independently represent a phenyl group which may be substituted with an alkyl or alkoxy group, an alkyl group, a cycloalkyl group or an aralkyl group, (D) a fluorinated isopropanol or a halogenated phenol of formula (2): â€ƒwherein X1 to X5 are the same or different and independently represent a halogen or hydrogen atom and at lease one of X1 to X5 is a halogen atom, and (E) at least one sulfur compound selected from a sulfonic acid and a dialkylsulfuric acid.