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US 4,482,640 AGranted
Ethylene oligomerization
AssigneePhillips Petroleum Company
InventorsRonald D. Knudsen, Stephen E. Reiter
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Abstract
A novel ethylene oligomerization catalyst is provided consisting essentially of a nickel compound, a phosphine compound, and an acid. In addition, an improved ethylene oligomerization process is provided which comprises contacting ethylene with the novel catalyst composition present, in an effective solvent, at a temperature from about 0.degree. C. to about 200.degree. C. As a result of the inventive process, high catalyst productivity and good selectivity to desired oligomeric products are obtained.
Claims12
A composition consisting essentially of:
- (a) at least one nickel compound selected from the group consisting of:
- bis(1,5-cyclooctadiene)nickel(O),
- bis(tricyclohexylphosphine)nickel(O),
- nickel tetracarbonyl,
- (cyclododecatriene)nickel, and
- bis(ethylene)(dicyclohexylphosphine)nickel;
- (b) a phosphine compound of the formula PR.sub.3 wherein R represents H or a C.sub.1 to C.sub.20 hydrocarbyl radical with the proviso that any alkenyl substitution be at least 3 carbon atoms removed from the phosphorus atom and at least one R is not H;
- and
- (c) an acid selected from the group consisting of (i) a fluorinated carboxylic acid of the formula R'COOH wherein R' represents a C.sub.1 to C.sub.10 hydrocarbyl radical having at least 1 fluorine (F) atom, (ii) a dicarboxcyclic acid of the formula (R").sub.2 --X--(COOH).sub.2 wherein R" independently represents H or a C.sub.1 to C.sub.20 hydrocarbyl or fluorinated hydrocarbyl radical and X is a tetravalent C atom or the tetra-substituted benzene radical C.sub.6 H.sub.2, (iii) 2-ketobutyric acid and (iv) glycine, such that the molar ratio of (b) to (a) is about 0.01-4.0 to 1 and the molar ratio of (c) to (a) is about 0.01-10.0 to 1.
6 more elements
Dependencies are inferred from the claim text.