Process for preparing solid strong base and superbase catalysts

Abstract

The invention relates to a process for preparing solid strong base and superbase catalysts, and belongs to the field of catalysts. The process is characterized by comprising the following steps: (1) adding a particle type carrier containing active hydroxy in a reaction kettle; (2) in vacuum condition, stirring and heating to a temperature of between 80 and 200 DEG C, and removing adsorbed water on the surface of the carrier; (3) raising the temperature to between 200 and 300 DEG C, and adding NaOH or KOH with equivalent mol number to that of the hydroxyl on the surface of the carrier to dehydrate in pressure reduction condition; and (4) preserving heat at a temperature of between 200 and 300 DEG C, and preparing the solid strong base catalyst when no water is generated. The super strong catalysts prepared by the method have high catalytic activity on various organic chemical reactions, can be used for ester exchange reaction, ester condensation reaction, aldol condensation reaction, alkylations of acyl compounds, double bond isomerization of alkene, double bond transfer of unsaturated compounds containing heteroatom, branch alkylation of alkylbenzene, partial hydrogenization of conjugated dienes, amine adding catalytical reaction and the like, and has the advantages of recycling and reuse, simple operation, no environmental pollution and the like.

Description

technical field [0001] The invention belongs to the field of catalysts, in particular to a method for preparing solid strong base and super base catalysts. Background technique [0002] Strong basic catalyst is a kind of important catalyst, because traditional basic catalysts such as potassium hydroxide, sodium hydroxide and other catalysts need to be formulated into solutions for use, after the catalysis is completed, neutralization, water washing and other processes are required to remove the lye, not only The treatment process is complicated, and it is easy to cause environmental pollution. NaH, NaNH 2 , NaOR (sodium alkoxide) and other strong basic catalysts are not only expensive, but also have difficulty in recycling and produce problems such as environmental pollution. Japan's Tabe Kozo et al. gave a brief introduction to this type of catalyst in the articles "New Solid Acids and Alkalis and Their Catalytic Applications" and Sun Luhou's "New Materials and Technologi...

AI Technical Summary

Problems solved by technology

But so far, KOH / γ-Al 2 o 3 , NaOH / γ-Al 2 o 3 , Na-NaOH / γ-Al 2 o 3 Such solid super bases are still in the research stage, and they all use powder or ultrafine powder carriers. Although this increases the surface area of ​​the catalyst, it brings difficulties to the separation and is not conducive to the recovery and reuse of the catalyst.