Catalyst composition and process for di-, tri- and/or tetramerization of ethylene

摘要

A catalyst composition and a process for di-, tri- and/or tetramerization of ethylene, wherein the catalyst composition comprises a chromium compound, a ligand of the general structure R1R2P—N(R3)—P(R4)—N(R5)—PR6R7, or any cyclic derivatives thereof, wherein at least one of the P or N atoms of the PNPNP-unit is member of a ring system, the ring system being formed from one or more constituent compounds of the ligand by substitution, and a co-catalyst or activator.

主权项

1. A catalyst composition comprising:
(a) a chromium compound; (b) a ligand of the general structure R1R2P—N(R3)—P(R4)—N(R5)—PR6R7 wherein R1, R2, R3, R4, R5, R6 and R7 are independently selected from halogen, amino, trimethylsilyl, C1-C10-alkyl, phenyl, benzyl, tolyl and xylyl; and (c) an activator or co-catalyst; wherein the concentration of the chromium compound is from 0.1 to 10 mmol/l; wherein the chromium compound is CrCl3(THF)3, Cr(III)acetylacetonate, Cr(III)octanoate, chromium hexacarbonyl, Cr(III)-2-ethylhexanoate or (benzene)tricarbonyl-chromium.