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Method for preparing cyclopentanone through cyclopentanol dehydrogenation

A technology for cyclopentanol and cyclopentanone, which is applied in the field of cyclopentanol dehydrogenation to prepare cyclopentanone, can solve the problems of low catalyst efficiency and high energy consumption, and achieve the effects of high use efficiency, low energy consumption and reduced production cost

Inactive Publication Date: 2012-07-25
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the cyclopentanol load WWH of the catalyst is only 0.3 ~ 1.5hr -1 , the efficiency of the catalyst is low, and the energy consumption is still high

Method used

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  • Method for preparing cyclopentanone through cyclopentanol dehydrogenation
  • Method for preparing cyclopentanone through cyclopentanol dehydrogenation

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Embodiment 1～10

[0022] The dehydrogenation reaction is carried out in a reactive distillation unit, which consists of a dehydrogenation reactor and a rectification column. The dehydrogenation reactor is a 5000ml glass reactor with a discharge port at the bottom. The material containing the catalyst enters a slurry pump from the discharge port, and the material is pumped to a heat exchanger and heated to the required temperature. The upper part of the reactor returns to the reactor through a liquid distributor, so that the catalyst is evenly distributed in the liquid. The top of the reactor is connected with a rectification column. The theoretical plate number of the rectification column is 45. A condensing reflux device with a vent and a discharge port is installed on the top of the rectification column. The system pressure is controlled by a vacuum pump.

[0023] First add 3000 grams of cyclopentanol to the reactor, and then add 300 grams of modified amorphous Raney nickel catalyst composed ...

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Abstract

The invention relates to a method for preparing cyclopentanone through cyclopentanol dehydrogenation. The method comprises the steps of carrying out catalytic dehydrogenation and rectification reactions on the raw material cyclopentanol so as to directly obtain the high-purity cyclopentanone, wherein the catalytic dehydrogenation temperature is 85-115 DEG C, the system pressure is 100-300mmHg, and granular Raney nickel type metal alloy comprising 53% of Al, 44% of Ni and 3% of Mo is adopted as a catalyst in the dehydrogenation reaction; and the cyclopentanol load WWH of the catalyst is 2-4hr-1. The gas-phase dehydrogenation reaction product directly enters in a rectifying column of which the number of theoretical plates is 45 to be purified and the reflux ratio of the rectifying column is controlled to be (2:1)-(5:1)to ensure that a cyclopentanone product with the purity of more than 99.9% is obtained. Compared with the prior art, the method disclosed by the invention has the advantages that the energy consumption is low; the use efficiency of the catalyst is high; the production cost is greatly reduced; the purity of the obtained cyclopentanone product is more than 99.9%; and a green and environment-friendly production process is provided.

Description

technical field [0001] The invention relates to a method for preparing cyclopentanone by dehydrogenating cyclopentanol, in particular to a method for dehydrogenating cyclopentanol into cyclopentanone by catalytic rectification under negative pressure using a modified Raney nickel catalyst. Background technique [0002] Cyclopentanone is an intermediate in the perfume and pharmaceutical industries, and can be used to produce fine chemical products such as new perfume methyl dihydrojasmonate and brandyne and anxiolytic buspirone, and can also be used in insecticides and herbicides In addition, because cyclopentanone has good solubility, it is widely used as a solvent in the electronics industry. The by-product C produced by cracking naphtha to ethylene 5 The cyclopentene separated from the fraction can be used as raw material to produce cyclopentanone. The main process is cyclopentene N 2 O direct oxidation method and cyclopentene hydration-dehydrogenation method are two tec...

Claims

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Application Information

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IPC IPC(8): C07C49/395C07C45/29
Inventor 石康明
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