Method for preparing cyclopentanol by direct hydration of cyclopentene

Abstract

The invention belongs to the field of organic chemical industry and specifically relates to a method for preparing cyclopentanol by direct hydration of cyclopentene. According to the method, materials composed of cyclopentene, water and a mixed solvent continuously pass through a fixed bed filled with a catalyst to undergo a hydration reaction, wherein the mixed solvent is composed of o-nitrophenol and alcohol according to the weight ratio of (0.5-1.5):1; after the hydration reaction, reactants are cooled and layered to obtain an oil phase and a water phase; and the oil phase material undergoes rectification at normal pressure, a fraction of 38-55 DEG C is condensed to obtain unreacted cyclopentene, a fraction of 105-120 DEG C is condensed to obtain a solvent, and a fraction of 135-165 DEG C is condensed and collected to obtain refined cyclopentanol. Conversion rate of cyclopentene is high. The solvent is more stable. During the preparation process of cyclopentanol by hydration, cyclopentene and the solvent basically undergo no side reaction to produce by-products. Thus, refining of cyclopentanol is simpler, and energy consumption is reduced.

Description

Technical field [0001] The invention relates to a method for producing cyclopentanol. In particular, it relates to a method for preparing cyclopentanol by direct hydration of cyclopentene in industry. Background technique [0002] Cyclopentanol is a colorless viscous liquid with aromatic odor. It is an important pharmaceutical and pesticide fine chemical product intermediate. It is mainly used to prepare bromocyclopentane, chlorocyclopentane, antibacterial drugs, and anti-allergic. Drugs and other products; in addition, because of its good solubility for various resins, it is widely used as a solvent in the electronics industry. The traditional production of cyclopentanol mainly uses adipic acid as a raw material, and is obtained after high temperature decarboxylation to obtain cyclopentanone and then hydrogenation. However, due to the production of a large number of pollutants and the restriction of the source of raw materials, the further development of this process is limited...

AI Technical Summary

Problems solved by technology

From the post-treatment point of view, the by-products produced by the alkylation reaction and etherification reaction are all high-boiling compounds, and the viscosity is relatively high. It is difficult to separate after the reaction. If it is not separated and applied mechanically with phenol, the Accumulation increases the viscosity of the system and causes production problems

And for using alcohol as solvent, because the selectivity of cyclopentanol decreases with the reduction of the addition of solvent butanol, as the addition of alcohol is too large, it is easy to dehydrate with cyclopentanol to generate ether under the hydration reaction conditions, and the solvent After the amount increases, it will increase the energy consumption of post-processing

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