Method of dimerization of olefins

Details Method of dimerization of olefins Method of dimerization of olefins

1977-03-18

1978-09-19

Davis, C.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

252429B, C07C 310

Patent

active

041154690

ABSTRACT:
The method of dimerization of olefins having from 2 to 4 carbon atoms consists in that at least one said olefin is mixed, in a medium of hydrocarbon or halogenated hydrocarbon solvents at a temperature of from 0.degree. to 100.degree. C and a pressure from 1 to 40 atmospheres, with a catalyst, which is a graft copolymer of a natural or a synthetic carbon-chain rubber with vinylpyridine; said copolymer swells in said solvents and contains from 0.5 to 40 per cent of fragments of polyvinylpyridine that are complexed with a nickel salt, and contains also from 2 to 50 mole per cent of -AIRX- units, where R is an alkyl having not more than 8 carbon atoms, and X is a halogen, the aluminum atom being bound with the main chain of the copolymer through the carbon atom. The atom ratio of Al/Ni is from 1 to 20.
Said catalyst is characterized by high stability and preserves it initial activity for a long period of time. It is not crushed in the process and is easy to recover. The catalyst is characterized also by high selectivity: the butene-1 content of a mixture of butenes, obtained by dimerization of ethylene, is 92 to 96 per cent. The methyl-pentene content of the dimerizate, obtained by dimerization of propylene, is 90 to 95 per cent.

REFERENCES:
patent: 3737474 (1973-06-01), Dunn
patent: 3872026 (1975-03-01), Dunn

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