A kind of preparation method of the catalyst that is used for acetone heterogeneous synthesis isophorone

Abstract

The invention relates to a method for preparing a catalyst used in synthesizing isophorone through an acetone multiphase method. The method provided by the invention comprises the following steps: weighing and dissolving a certain quantity of magnesium salt, calcium salt, aluminum salt and transition metal salt in distilled water to prepare a mixed salt solution; dropwise adding a precipitator-alkali solution to the mixed salt solution in the stirring course; and aging, filtering, washing, drying and roasting the precipitates to finally obtain the catalyst. Compared with the prior art, the method provided by the invention has the characteristics: (1) the preparation course of the catalyst is simple; (2) the price of the raw materials of the catalyst is low; and (3) the reaction is carriedout under gas phase conditions, and the catalyst is a magnesium-calcium-aluminum composite oxide modified by the transition metal. The catalyst provided by the invention has certain acid strength andalkali strength, thereby enabling the catalyst to have higher catalytic activity and stability. In the reaction for preparing the isophorone through acetone condensation, the conversion rate of acetone is about 34%, the selectivity of the isophorone reaches more than 90%, and the one-way running time is larger than 1000 hours.

Description

Technical field

[0001] The invention relates to the field of chemical engineering, and in particular to a method for preparing a catalyst for acetone to synthesize isophorone through a heterogeneous method. Background technique

[0002] Isophorone is an important fine chemical raw material with a wide range of uses. It can be used as an advanced solvent or as an organic reaction intermediate. It can dissolve nitrocellulose, acrylic esters, alkyd resins, and polyesters. It can also be used as intermediate raw materials with high polymer materials such as epoxy resin, and produce important products such as alcohol, acid, amine, ester and isocyanate through reaction.

[0003] The industrialized process route for the synthesis of isophorone from acetone is mainly acetone condensation. Acetone condensation is the self-condensation of three molecules of acetone into one molecule of isophorone. The current production process is mainly the pressurized liquid phase condensation of acetone...