Ethylene trimerization
AssigneeBP Amoco Corporation
InventorFeng-Jung Wu
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Abstract
Ethylene is trimerized to form 1-hexene by using a catalyst comprising an aluminoxane and polydentate phosphine, arsine, and/or stibine coordination complex of a chromium salt. Catalysts, complexes, and ligands enabling production of 1-hexene in extremely high yields and purity are also described.
Claims4
A polydentate phosphine, arsenic and/or stibine coordination complex of a chromium salt having the formula LCrX.sub.n, where L is a coordinating polydentate phosphine, arsine and/or stibine ligand, X represents anions which can be the same or different, and n is an integer of 2 to 4;
- and wherein said ligand has the formula ##STR7## where Z can be the same or different and is phosphorus, arsenic or antimony, R is a hydrocarbyl group, R.sup.1 is a dimethylene group and R.sup.2 is a linear polymethylene group having at least 3 carbon atoms.
An ethylene trimerization catalyst composition comprising an alminoxane and a polydentate phosphine, arsenic and/or stibine coordination complex of a chromium salt, wherein the mole ratio of aluminum to chromium in the catalyst is in the range of from about 1:1 to about 10,000:1;
- wherein said complex has the formula LCrX.sub.n, where L is a coordinating polydentate phosphine, arsine and/or stibine ligand, X represents anions which can be the same or different, and n is an integer of 2 to 4;
- and wherein said ligand has the formula ##STR8## where Z can be the same or different and is phosphorus, arsenic or antimony, R is a hydrocarbyl, group, R.sup.1 is a dimethylene group and R.sup.2 is a linear polymethylene group having at least 3 carbon atoms.
Dependencies are inferred from the claim text.