Catalyst for preparing cyclohexanol through cyclohexene hydration and application of catalyst

Abstract

The invention discloses a catalyst for preparing cyclohexanol through cyclohexene hydration. The catalyst consists of a carrier HZSM-5 and supported active ingredient niobium, the catalyst is subjected to surface modification by adopting a silylating reagent, and the oleophylic performance can be enhanced. Meanwhile, because the number of reaction sites containing activated hydrogen is reduced, the stability of the compound is enhanced. The application of the catalyst in preparation of the cyclohexanol through cyclohexene hydration comprises the following steps: adding the catalyst prepared by the reaction, cyclohexene and water into a reactor, wherein a mass ratio of the catalyst to the cyclohexene to the water is 1 to 2-20 to 2-20, the reaction temperature is 80 to 180 DEG C, and the reaction time is 0.5-3.0 hours. The prepared catalyst is easy to separate and recycle, the equipment is not corroded, and the catalyst is environmentally friendly. Compared with an original method for preparing cyclohexanol through heterogeneous catalysis cyclohexene hydration, the method is high in catalyst activity and high in selectivity.

Description

technical field [0001] The technical scheme of the invention belongs to the synthesis of cyclohexanol, and relates to a process for preparing cyclohexanol by hydrating cyclohexene as a raw material. Specifically, it relates to a silylating agent and niobic acid to modify the surface of HZSM-5 to obtain an amphiphilic catalyst and its preparation and application method. Background technique [0002] Cyclohexanol can be used to prepare adipic acid, hexamethylenediamine, cyclohexanone, and caprolactam. As an excellent organic chemical product with a medium and high boiling point, it is widely used in the fields of organic chemical industry, textiles, and coatings. Due to its good solubility and low volatility, cyclohexanol can also be used as a solvent for many polymers, alkyd resins, rubber, ethyl cellulose, acetate cellulose and nitrocellulose. [0003] The hydration route of cyclohexene to produce cyclohexanol is safe, energy-saving, 100% carbon atom utilization, no waste a...

AI Technical Summary

Problems solved by technology

In the 1940s, Phillip Petroleum Company (US2504517, US2414646) reported that using sulfuric acid as a catalyst could hydrate cyclohexene to generate cyclohexanol, but there were defects such as complex product recovery process, high energy consumption, and serious equipment corrosion in the sulfuric acid process.

In order to overcome the defects of using homogeneous catalysts, in 1986, Dupont applied for a patent (US4595786) on the use of perfluorosulfonic acid resins to catalyze the hydration of cyclohexene; in 2008, Lin Qingxiang proposed a sulfonic acid-type strong salt ion exchange The cyclohexene hydration patent with resin as catalyst (CN101284767). Compared with mineral acid catalysts, ion exchange resins solve the problems of target product recovery and separation. The exchange resin has the disadvantages of short life and poor thermal stability, and its high price also limits its wide application in hydration systems; in 1986, Asahi Kasei published a patent for the preparation of high-efficiency hydration molecular sieve catalysts (JP61180735, JP61234945), more research It shows that in the three-phase reaction system of cyclohexene, water and catalyst, the hydrophobicity of the inner wall of the molecular sieve channel plays an important role in the competitive adsorption of cyclohexene and water, and the appropriate hydrophobicity is beneficial to the adsorption of cyclohexene in the catalyst channel. , so as to improve the catalytic activity, that is, the reaction rate and equilibrium are controlled by the adsorption capacity of cyclohexene and cyclohexanol on the catalyst, and the distribution coefficient of the oil-water phase

[0006] Molecular sieve is a solid acid catalyst widely used in industry at present. It is easy to prepare, has stable properties, is easy to separate from reactants, and can be recycled many times. It has obvious advantages, but in order to achieve a considerable reaction rate in industry, a large amount of catalyst is required , so it is necessary to develop more efficient hydration catalysts

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