Catalytic system for preparing 6-C by di-propylene alkene

Abstract

The catalyst system for dimerizing propylene to prepare C6 olefin consists of di-salicylal nickel(II) compound and organoaluminium compound; or consists of di-salicylal nickel(II) compound, organoaluminium compound and organic phosphine. The catalyst catalyzes the propylene dimerizing reaction in the presence of organic solvent. The catalyst system of di-salicylal nickel(II) compound and organoaluminium compound may reach catalytic activity of 90000-110000 mol C3 / mol Ni. hr, dimerizing selectivity of 70-90 % and methyl amylene content in the dimerizer product of 80 %. The catalyst system of di-salicylal nickel(II) compound, organoaluminium compound and organic phosphine may reach catalytic activity of 300000 mol C3 / mol Ni. hr, C6 olefin selectivity of 90 % and 2, 3-dimethyl butene selectivity of 65 %.

Description

technical field [0001] The invention relates to a catalytic system for preparing hexaolefin by dimerization of propylene. [0002] The invention also relates to the use of the above system in the dimerization of propylene. Background technique [0003] Propylene dimerization is one of the important methods to prepare hexaolefins, and various hexaolefins are important chemical raw materials and intermediates. For example, methylpentene can be used to synthesize flotation ore bubbler, 2,3-dimethylbutene is an important intermediate for the production of pesticide fenpropathrin and some spices, and 2,3-dimethylbutene is also used as Additives for gasoline to increase its octane number, α-hexene is used as an important comonomer for modifying polyolefin resins. [0004] In 1966, G. Wilke et al. used the cationic allyl nickel system to catalyze the dimerization of propylene (Wilke G, Bogdanovic B et al Angew Chem Int Ed, 1966, 5(2): 151), which promoted the transition metal cat...

AI Technical Summary

Problems solved by technology

Since J. Ewersd first catalyzed the dimerization of propylene with the nickel acetylacetonate system in 1966, various 2,4-pentanedione nickel complex systems coordinated with oxygen and oxygen bidentate have also been widely used in the dimerization of propylene. Reaction, later the British B.P chemical company used the nickel acetylacetonate / tricyclohexylphosphine system to produce 2,3-dimethylbutene, and the selectivity of 2,3-dimethylbutene in hexacarbon olefins was 55-60%. But the activity is very low (15000h -1 ) (US 4835328; Chem. Britain 1990, 26, 400)

Japan's Sumitomo Corporation uses the nickel naphthenate / tricyclohexylphosphine system to catalyze the dimerization of propylene, the selectivity of 2,3-dimethylbutene reaches 80%, and the conditions are mild, but the activity is not high (up to 20000~60000h -1 ), and its system is more complicated, need to add halogenated phenolic alcohol, strong sulfonic acid, sulfonic acid ester and isoprene (Sumitomo Chemical, 1998, I, 99; JP 01048812)

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