Preparation method of catalyst for hydrating cyclohexene

Abstract

The invention provides a preparation method of a catalyst for hydrating cyclohexene. According to the preparation method, a commercial sodium-type ZSM-5 (Zeolite Socony Mobil-5) molecular sieve is treated by using appropriate alkaline liquor, so as to increase the porosity and the lipophilicity of the molecular sieve; afterwards, the modification is carried out by adopting elements of P, La and the like in a combinative manner, so as to modulate and increase the acidity and the hydrothermal stability of the molecular sieve. When the catalyst is applied to the hydration of the cyclohexene to prepare cyclohexanol, the percent conversion of the cyclohexene and the selectivity of the cyclohexanol can be drastically increased, and the reaction stability of the catalyst can be drastically improved. The preparation method of the catalyst, which is provided by the invention, is simple, safe and controllable in operating process, and is easy to realize in an industry.

Description

technical field [0001] The invention belongs to the technical field of preparation of molecular sieve catalysts, in particular to a preparation method of a cyclohexene hydration catalyst. Background technique [0002] The direct hydration of cyclohexene is an important method to prepare cyclohexanol, an important chemical raw material. This method overcomes the cyclohexane that exists in the cyclohexane oxidation process for preparing cyclohexanol, which is easy to form an explosive mixture after mixing with air, the production process has poor safety, high energy consumption, high price of process raw material phenol, and large hydrogen consumption. And many other shortcomings, it has the advantages of safe production route, energy saving, good carbon atom economy, environmental friendliness and no waste, etc., and shows advantages in industrial applications, so it has attracted people's attention and attention. [0003] The hydration of cyclohexene is a typical protonic a...

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Problems solved by technology

Although the above two methods can improve the effectiveness of the cyclohexene hydration reaction to a certain extent, there are also certain problems. For example, adding a co-solvent to the reaction system will cause difficulties in the separation of later products, which cannot be achieved in actual industrial production. It has been effectively applied; the direct loading of metal and non-metal ions on the molecular sieve not only affects its acidity, but also affects the pore structure, and the catalyst activity is limited; although the synthesis of molecular sieves using a template-free system can effectively reduce production costs and reduce environmental damage, only by controlling The uniformity of the particle size of the molecular sieve obtained by adjusting the particle size of the synthetic condition needs to be improved, the repeatability and stability of production are still unknown, and the hydrothermal stability of the molecular sieve is relatively poor, and the catalyst activity cannot be effectively improved