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Method for preparing cyclopentanol from cyclopentene

A technology of cyclopentene and cyclopentanol, which is applied in the field of preparing cyclopentanol by transesterification of CaO catalyst, can solve problems such as pollution and equipment corrosion environment, and achieve the effects of simplified process and high use efficiency

Inactive Publication Date: 2012-07-25
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Problems solved by technology

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

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  • Method for preparing cyclopentanol from cyclopentene
  • Method for preparing cyclopentanol from cyclopentene

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Embodiment 1～10

[0023] 1. Esterification reaction

[0024] The esterification reaction is carried out in a tubular fixed bed reactor with a size of φ25mm×1500mm. The reactor is filled with 50 grams of a spherical sulfonic acid-based cation exchange resin catalyst with a particle size of 0.40-1.25 mm to form a fixed-bed catalyst bed, and the mass exchange capacity of the resin is 4.5 mmol / g. The outside of the reactor is equipped with a circulating hot water temperature control jacket, and temperature measuring platinum resistors are installed on the upper, middle and lower parts of the catalyst bed. The reaction feed volume is controlled by the feed pump, and the system pressure is regulated by the back pressure valve.

[0025] The reaction raw materials cyclopentene and acetic acid are reacted through a fixed bed according to the set feed amount, and the esterification reaction is carried out according to the set reaction conditions. The cyclopentyl acetate product of the esterification reactio...

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Abstract

The invention relates to a method for preparing cyclopentanol from cyclopentene, which comprises the following steps: (1) mixing cyclopentene and acetic acid to form a liquid phase, and carrying out an esterification reaction of the liquid phase through a catalyst bed composed of sulfonic acid group cation exchange resin, so that cyclopentene and acetic acid are converted into cyclopentyl acetate, wherein a molar ratio of acetic acid to cyclopentene is (2-5):1, a mass space velocity is (1-3)hr<-1>, a reaction temperature is 50-80 DEG C, and a reaction pressure is 0.1-0.5MPa; (2) carrying out rectification of reaction liquid in a rectification column with the number of theoretical plates of 25, recycling unreacted cyclopentene and acetic acid from the top of the rectification column and cycling and using, and directly using crude acetic acid cyclopentyl ester obtained from a column bottom as a raw material of transesterification; (3) carrying out dehydration of methanol by a 3A molecular sieve, so that the water content of methanol is decreased to below 10ppm; and (4) mixing crude cyclopentyl acetate and methanol, and preparing cyclopentanol through the transesterification, wherein a mass ratio of methanol to acetic acid cyclopentyl ester is (0.8-2.0):1, and the feeding amount of a CaO catalyst is 1-3% of the weight of cyclopentyl acetate. Compared with the prior art, the method provided by the invention has the advantages that the energy consumption is low, the use efficiency of the catalyst is high, and the production cost is greatly reduced.

Description

technical field [0001] The invention relates to a method for preparing cyclopentanol from cyclopentene, in particular to carrying out an addition reaction of a solution of cyclopentene and acetic acid through a fixed-bed catalyst bed composed of sulfonic acid-based cation exchange resins, and converting it into acetic acid cyclopentanol. Pentyl ester, and then use the mixed solution of it and methanol to carry out transesterification reaction with CaO catalyst to prepare the method for cyclopentanol. 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 limited. In addition, t...

Claims

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Application Information

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IPC IPC(8): C07C35/06C07C29/128C07C69/14C07C67/03
Inventor 石康明
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