Process for preparing cyclopentanol with cyclopentene

Abstract

The invention relates to a process for preparing cyclopentanol with cyclopentene. The process includes the following steps: (1) mixing the cyclopentene with acetic acid, then subjecting the liquid phase to esterification through a catalyst bed formed by sulfonic group cation exchange resins so that the the cyclopentene and the acetic acid can be converted into cyclopentyl acetic ester with the molar ratio of the acetic acid and the cyclopentene being (2-5):1, the space velocity being from 1 to 3 hr-1, the reaction temperature being between 50 DEG C and 80 DEG C, and the reaction pressure being from 0.1 to 0.5 MPa; (2) subjecting the reaction liquid to rectification in a fractionating column with a theoretical plate being 25, recycling the unreacted cyclopentene and acetic acid from the top of the fractionating column, and directly using crude cyclopentyl acetic ester obtained from a column reactor as ester-exchange raw materials; (3) mixing the crude cyclopentyl acetic ester with methyl alcohol, subjecting the mixture to transesterification through a catalyst bed formed by granular calcium oxide (CaO) and finally obtaining the cyclopentanol. Compared with processes in prior art, the process for preparing the cyclopentanol with the cyclopentene enables the reaction conversion ratio and selectivity to be improved obviously, the process is obviously simplified, and the defects of the equipment corrosion and the environment pollution which are caused by using sulfuric acid in the indirect hydration processing of the cyclopentane are overcome.

Description

technical field [0001] The invention relates to a method for preparing cyclopentyl alcohol from cyclopentene, in particular to carrying out an esterification reaction of a solution of cyclopentene and acetic acid through a fixed-bed catalyst bed composed of a sulfonic acid-based cation exchange resin, and converting it into acetic acid ring Pentyl ester, and then the mixed solution of it and methanol is carried out the method for transesterification reaction preparation cyclopentanol through CaO fixed-bed catalyst bed layer. Background technique [0002] Cyclopentanol is an important intermediate of fine chemical products, mainly used in the preparation of bromocyclopentane, chlorocyclopentane and methyl cyclopentyl ether. Cyclopentanol can be prepared from adipic acid through high-temperature decarboxylation to cyclopentanone, and then hydrogenated. However, due to the large amount of pollutants produced and the cost of raw materials, this preparation method is increasingly...

AI Technical Summary

Problems solved by technology

[0003] The invention provides a method for preparing cyclopentanol from cyclopentene. The technical problem to be solved is to solve the problem of maintaining high conversion rate of cyclopentene and good selectivity of cyclopentene in the indirect hydration process of cyclopentene. At the same time, overcome the shortcomings of serious equipment corrosion and environmental pollution due to the use of sulfuric acid

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