Catalyst for preparing cyclohexane carboxylic acid through benzoic acid hydrogenation and preparation method and application thereof

Abstract

The invention provides a catalyst for synthesizing cyclohexane carboxylic acid through benzoic acid hydrogenation. The catalyst contains a carrier, an assistant and an active ingredient, wherein the carrier is nickel foam, the assistant is activated carbon, and the active ingredient is a metallic element Pd. The invention further provides a preparation method of the catalyst and application of the catalyst as a monolithic catalyst in a fixed bed. According to the catalyst provided by the invention, the preparation method is simple, the raw materials are wide in source and are easily obtained, and the usage amount of precious metal is small; during application, the catalyst has strong carbon oxide poisoning resistance, high catalytic activity and good selectivity; compared with the traditional powder catalysts, the catalyst provided by the invention has the advantages that the problems of catalyst ingredient loss and catalyst wear are solved thoroughly, the separation of a reaction solution from the catalyst is not required, and the loading and replacing of the catalyst are very convenient and fast.

Description

technical field [0001] The invention relates to a catalyst for preparing cyclohexanecarboxylic acid through hydrogenation of benzoic acid, a preparation method and application thereof. Background technique [0002] Cyclohexanecarboxylic acid is an important chemical and pharmaceutical intermediate, which is prepared by catalytic hydrogenation of benzoic acid or sodium benzoate. It can be used in the synthesis of photocuring agent 184, and it is also an efficient UV-curing initiator and non-yellowing initiator, a solubilizer for vulcanized rubber, a clarifying agent for petroleum, and a pharmaceutical intermediate, such as for drug anti-pregnancy 392 and treatment of schistosomiasis Synthesis of new drug praziquantel. In addition, the hydrogenation of benzoic acid to cyclohexanecarboxylic acid is also an important step in the production route of caprolactam by the toluene method (SNIA process) of SNIA Company. Industrially, the benzoic acid hydrogenation process is mainly b...

AI Technical Summary

Problems solved by technology

However, the reactor reaction process is complicated, and the product is in contact with the catalyst for a long time, which also increases the secondary reaction and reduces the reaction selectivity.

At the same time, since the palladium / carbon catalyst is powdery, it is difficult to separate from the reaction raw materials and products, and the loss in filtration separation and regeneration is also large, resulting in a higher unit consumption of precious metal palladium