Method for preparing cyclopentanol

Abstract

The invention belongs to the technical field of organic chemical industry, and concretely relates to a method for preparing cyclopentanol. According to the method, a material composed of cyclopentene, water and a mixed solvent is continuously performed with a hydration reaction through a fixed bed filled with a catalyst, wherein, the mixed solvent is composed of o-nitrophenol and ketone with weight ratio being (0.5-1.5):1, after the hydration reaction is finished, a reactant is cooled and delaminated to an oil phase and an water phase, the oil phase material is rectificated under normal pressure, fraction at the temperature of 38-55 DEG C is condensed to obtain the unreacted cyclopentene, and the fraction at the temperature of 135-165 DEG C is condensed and collected to obtain refined cyclopentanol. The method has the advantage of high conversion rate for cyclopentene, a solvent is more stable, a side reaction is not generated by cyclopentene and the solvent during a cyclopentanol preparation process through hydration to obtain by-product, refining of cyclopentanol is simpler, and energy consumption is saved.

Description

technical field [0001] The present invention relates to a kind of production method by 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 an aromatic odor. It is an important pharmaceutical and pesticide fine chemical product intermediate. In addition, because of its good solubility to various resins, it is widely used as a solvent in the electronics industry. The traditional production of cyclopentanol mainly uses adipic acid as the raw material, which is decarboxylated at high temperature to obtain cyclopentanone and then hydrogenated. However, the further development of this process is limited due to the production of a large amount of pollutants and the restriction of the source of raw materials. . In recent years, due to the wide source and low price of C5 olefin fractions, the research on the production of cycl...

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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