Preparation of a catalyst useful in the dimerization of butadien

Details Preparation of a catalyst useful in the dimerization of butadien Preparation of a catalyst useful in the dimerization of butadien

1989-05-08

1990-11-27

Pak, Chung K.

Catalyst, solid sorbent, or support therefor: product or process

Catalyst or precursor therefor

Inorganic carbon containing

502200, 502161, 423365, 423417, B01J 2118, B01J 3120, B01J 3118

Patent

active

049735683

ABSTRACT:
Catalysts suitable for the dimerization of a diolefin, e.g. butadiene to 4-vinylcyclohexene, are prepared by reacting (1) iron chloride and sodium nitrite or alternatively (2) iron nitrosyl chloride with (3) carbon monoxide in an organic solvent in the presence of a readily oxidizable metal, e.g. tin. The catalyst solution is filtered prior to use to remove particulate matter such as unreacted tin.
While the reaction employing iron chloride and sodium nitrite is preferred, the catalyst produced by either method contains a minimum of reducing agent and by-products. It can be isolated and stored in the absence of the butadiene monomer while retaining its stability and activity.

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