Ethylene oligomerization catalyst systems having enhanced selectivity
AssigneesSK Innovation Co., Ltd., SK Global Chemical Co., Ltd.
InventorsTaek Kyu Han, Sung Seok Chae, Sang Ook Kang, Kyung Ryang Wee, Sung Kwan Kim
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Abstract
Disclosed herein is a catalyst system for selective oligomerization of ethylene, which comprises a P—C—C—P frame-work ligand, which is (R1)(R2)P—(R5)CHCH(R6)—P(R3)(R4), and a chromium-based metal compound. Also disclosed is a method of greatly enhancing the activity and selectivity of oligomerization, such as trimerization or tetramerization, using a ligand having a specific steric arrangement structure.
Claims16
A method of producing 1-hexene by selectively trimerizing ethylene using a catalyst system comprising a transition metal or transition metal precursor, a promoter and a ligand represented by any one of the following formulas 1 to 4, wherein the promoter is methylaluminoxane (MAO) or ethylaluminoxane (EAO) and the ligand is sterically asymmetric with respect to a plane of symmetry:
- wherein R1, R2, R3 and R4 are each independently hydrocarbyl, substituted hydrocarbyl, heterohydrocarbyl or substituted heterohydrocarbyl, R5 and R6 are each independently hydrocarbyl or substituted hydrocarbyl, and A is hydrocarbylene, substituted hydrocarbylene, heterohydrocarbylene or substituted heterohydrocarbylene.
A method of producing 1-octene by selectively tetramerizing ethylene using a catalyst system comprising a transition metal or transition metal precursor, a promoter and a ligand represented by any one of the following formulas 1 to 4, wherein the promoter is methylaluminoxane (MAO) or ethylaluminoxane (EAO) and the ligand is sterically asymmetric with respect to a plane of symmetry:
- wherein R1, R2, R3 and R4 are each independently hydrocarbyl, substituted hydrocarbyl, heterohydrocarbyl or substituted heterohydrocarbyl, R5 and R6 are each independently hydrocarbyl or substituted hydrocarbyl, and A is hydrocarbylene, substituted hydrocarbylene, heterohydrocarbylene or substituted heterohydrocarbylene.
Dependencies are inferred from the claim text.