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Method for preparing cyclopentanone by using cyclopentene as raw material

A technology for cyclopentene and cyclopentanone, applied in the field of preparing cyclopentanol, can solve the problems of increased energy consumption in post-processing, difficulty in separation, reduced selectivity, etc., and achieves reduction of solvent recovery and purification procedures, simplification of separation and purification system, The effect of reducing equipment investment

Active Publication Date: 2016-05-18
CHINA PETROLEUM & CHEM CORP +1
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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 low-carbon alcohol and ether as solvent, because the selectivity of cyclopentanol reduces with the reduction of solvent addition (cyclopentyl alcohol reaches a certain concentration, cyclopentene and cyclopentyl alcohol can react to generate dicyclopentanyl ether, or cyclopentanol Intermolecular dehydration of amyl alcohol forms dicyclopentanyl ether, thereby reducing the selectivity of the reaction)
However, if the amount of solvent added is too large, the energy consumption of post-treatment will be increased.

Method used

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  • Method for preparing cyclopentanone by using cyclopentene as raw material
  • Method for preparing cyclopentanone by using cyclopentene as raw material
  • Method for preparing cyclopentanone by using cyclopentene as raw material

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Embodiment (1-5

[0020] 1) The material composed of cyclopentene, water, and mixed solvents is continuously hydrated through a fixed bed filled with a catalyst. The catalyst is a strongly acidic cation exchange resin, and its surface is anchored with sulfonic acid groups (purchased from Tianjin Weide International Trade Co., Ltd. company, trade name Amberlyst35), the reaction temperature is 100 ~ 160 ℃, the reaction pressure is 1.0 ~ 3.0MPa, the volume space velocity is 0.5 ~ 2hr -1 ; Wherein: the mixed solvent is composed of o-nitrophenol and cyclopentanone with a mass ratio of 1:(0.5~1.5); the molar ratio of the water and cyclopentene is (3.0~10.0):1, the The weight ratio of cyclopentene and mixed solvent is 1: (0.5~1.5);

[0021] 2) The hydrated product is separated through a raw material recovery tower, the temperature of the tower reactor is controlled at 60-70° C., and the reflux volume ratio is controlled at 1-5. The heavy component material comes out from the bottom of the tower, and ...

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Abstract

The invention belongs to the technical field of organic chemical industry and specifically relates to a method for preparing cyclopentanone by using cyclopentene as a raw material. According to the method, materials composed of cyclopentene, water and a mixed solvent continuously pass through a fixed bed loaded with a catalyst to undergo a hydration reaction, and then the hydration reaction product undergoes catalytic dehydrogenation so as to prepare cyclopentanone. The mixed solvent is composed of o-nitrophenol and cyclopentanone at the mass ratio of 1: (0.5-1.5). Conversion rate of cyclopentene is high, and cyclopentene and the solvent are hardly subjected to side reaction. By the method, separation technology is simplified, and energy consumption is lowered.

Description

technical field [0001] The invention relates to a method for producing cyclopentanone, in particular to a method for preparing cyclopentanol using cyclopentene as a raw material. Background technique [0002] Cyclopentanone is a raw material for the preparation of new spices such as methyl dihydrojasmonate and brandyne and anxiolytic buspirone. At the same time, because of its good solubility to various resins, it is also widely used as a solvent in the electronics industry. [0003] In the traditional production method, adipic acid is used as raw material to obtain cyclopentanone through high-temperature decarboxylation, but a large amount of pollutants are produced in the process, and the source of raw materials is restricted, which limits the further development of the process. In recent years, due to the wide range of sources and low price of C5 olefin fractions, the research on the production of cyclopentanone from C5 fractions has aroused great interest. Among them, ...

Claims

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Application Information

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IPC IPC(8): C07C49/395C07C45/29C07C45/82
Inventor 黄勇周飞秦技强吴卓华建英郑重薛正秀
Owner CHINA PETROLEUM & CHEM CORP
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