Double-ligand zinc complex catalyst and application thereof

Abstract

The invention discloses a double-ligand zinc complex catalyst which is prepared from an active main body zinc halide salt, an active functional ligand L1 and a corrosion-inhibition functional ligand L2, wherein the active functional ligand L1 is tetramethyl ammonium halide, tetraethyl ammonium halide, tetrapropyl ammonium halide, tetraethyl phosphonium halide, tetraphenyl phosphonium halide, methyl tri-tert-butyl phosphonium halide or methyl triphenyl phosphonium halide; and the corrosion-inhibition functional ligand L2 is N-methylimidazole, iminazole, isoquinoline, quinoline, 2-toluquinoline, 4-toluquinoline, biquinoline, pyridine, 3-methylpyridine or 1,10-o-phenanthroline. The invention also discloses application of the catalyst in preparing corresponding cyclic carbonate by CO2-epoxy compound cycloaddition. The catalyst has the advantages of low temperature, high catalytic activity, low corrosivity, easy separation, high stability, favorable recovery performance and the like, can form a homogeneous catalytic system, and has favorable industrial application prospects.

Description

Technical field [0001] The invention belongs to the field of chemical catalysts, and specifically relates to a dual-ligand zinc complex catalyst and its application. Background technique [0002] CO 2 It is not only the main greenhouse gas, but also the abundant, cheap, and non-toxic C1 resource. Under the trend of "atomic economy", "sustainable development" and "green chemistry", how to realize CO under relatively mild conditions 2 The chemical fixation has become one of the hot topics in international research and development. Take CO 2 It is very rare to synthesize corresponding cyclic carbonate with epoxide as raw material. 2 One of the routes to achieve industrialization as a raw material. By CO 2 Propylene carbonate obtained by cycloaddition reaction with propylene oxide is an excellent organic solvent and organic synthesis intermediate. It has the advantages of high boiling point, high polarity, low toxicity and low corrosiveness. It is widely used in plastics, printing an...

AI Technical Summary

Problems solved by technology

[0013] It can be seen that the combination of metal salts and ionic liquids, quaternary ammonium salts, and quaternary phosphonium salt catalysts into one composite catalyst has a good effect on CO 2 The cycloaddition reaction with epoxides has high catalytic activity. These catalysts have applied the concept of ionic liquids to varying degrees, and the preparation of ionic liquids is complicated and expensive. Further demonstration and discussion are needed.

In particular, in view of the obvious corrosion and poor water resistance of Lewis metal salts, the industrial application of these catalysts is seriously hindered.

Of course, in industrial production, the form of adding corrosion inhibitors can be used to reduce the corrosion of the catalytic system to materials, but the addition of corrosion inhibitors will cause difficulties in product separation, and the slow release performance of corrosion inhibitors at high temperatures is poor. It has certain toxicity and may cause environmental pollution, which hinders its development in corrosion-resistant catalytic systems.

Images