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

Abstract

The catalyst system for catalyzing propylene dimerization to prepare C6 olefin consists of either di(salicylal imine) nickel(II) and organic aluminium compound, or di(salicylal imine) nickel(II), organic aluminium compound and organic phsphine. The catalyst system of di(salicylal imine) nickel(II) and organic aluminium compound has catalytic activity up to 60000-120000 mol C3-- / mol Ni. hr, dimerization selectivity of 70-90 %, methyl amylene content in dimerized product up to 80 %. The catalyst system of di(salicylal imine) nickel(II), organic aluminium compound and organic phsphine has catalytic activity up to 240000 mol C3-- / mol Ni. hr, C6 olefin selectivity up to 90 % and 2, 3-dimethyl butene selectivity up to 64 %.

Description

technical field [0001] The invention relates to a catalytic system for preparing six-carbon olefins by dimerization of propylene, which consists of a bis(salicylaldimine) nickel (II) complex, an organoaluminum compound, or a bis(salicylaldimine) nickel (II) complex, Composition of organoaluminum compound and organophosphine. The system catalyzes the dimerization of propylene in the presence of an organic solvent. Background technique [0002] Various six-carbon olefin products obtained by dimerization of propylene are important chemical raw materials and intermediates. For example, 2,3-dimethylbutene is an important intermediate in the production of the pesticide fenpropathrin and some spices, and is also used as a gasoline additive to increase its octane number, and methylpentene can be used to synthesize flotation ore air bubbles , α-Hexene is an important comonomer for the preparation of modified polyolefin resins. [0003] The homogeneous catalytic system for propylen...

AI Technical Summary

Problems solved by technology

In recent years, transition metal complexes coordinated by nitrogen and oxygen have also made important progress in olefin polymerization, but their applications in olefin oligomerization are very few, only S.Wolfgang et al. Potassium oxide system is used to prepare hexene (German Offen 2252856 / 1971; German (East) 99556 / 1973), but the activity and selectivity are very low (the selectivity of n-hexene is not more than 40%)