Appeal No. 2000-0998
Application 08/521,432
to the reaction vessel, and trimerizing the ethylene to form
1-hexene. Claim 1 is illustrative:
1. A process for producing 1-hexene comprising the steps
of:
(1) preparing a catalyst system by contacting in a 1-hexene
solvent the following components (A), (B), (C) and (D):
(A) a chromium-containing compound represented by the
general formula:
CrXkYm
wherein X is a residue of a carboxylic acid, a residue
of a 1,3-diketone, a halogen atom or an alkoxyl group,
k is an integer of 2 to 4, Y in Ym is an amine
compound, a phosphine compound, a phosphine oxide
compound, a nitrosyl group or an ether compound and m
is an integer of 0 to 6, with the proviso that any two
Y’s may be same or different;
(B) trialkylaluminum or dialkylaluminum hydride;
(C) a pyrrole compound or a derivative thereof;
(D) a Group 13 (IIIB)-halogen compound represented by the
general formula: MTtU3-t or a Group 14 (IVB)-halogen
compound represented by the general formula:
M’Tt’U4-t’ wherein M is a Group 13 (IIIB) atom, M’ is
a Group 14(IVB) atom, T is an alkyl group, an aryl
group, an allyl group or a hydrogen atom, U is a
halogen atom, t is a real number of 0 or more and less
than 3 and t’ is a real number of 0 or more and less
than 4;
(2) charging the catalyst system in a reaction vessel
without removing the 1-hexene solvent from the catalyst system;
(3) adding ethylene and a solvent to the reaction vessel;
and
2
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