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Method for preparing cyclopentanone from cyclopentanol by catalytic rectification process

A technology for preparing cyclopentanone from cyclopentanol and preparing cyclopentanone from cyclopentanol is applied in the field of preparing cyclopentanone by dehydrogenation of cyclopentanol, and can solve problems such as unusable catalysts

Active Publication Date: 2005-02-16
SINOPEC SHANGHAI PETROCHEMICAL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This catalytic rectification process will greatly reduce energy consumption, but none of the catalysts used in the prior art can be used in a liquid-phase ebullating bed, such as the above-mentioned supported noble metal catalysts with good catalytic performance cannot withstand the impact of the ebullating bed

Method used

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  • Method for preparing cyclopentanone from cyclopentanol by catalytic rectification process
  • Method for preparing cyclopentanone from cyclopentanol by catalytic rectification process
  • Method for preparing cyclopentanone from cyclopentanol by catalytic rectification process

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Embodiment 1～10

[0024] The reaction is carried out in a reactive distillation unit, which consists of a dehydrogenation reactor and a rectification column. The reactor is a glass fluidized bed reactor with a diameter of φ25mm×510mm. A baffle full of small holes is placed at the bottom of the reactor. The diameter of the small holes is about 0.01mm, and the raw material inlet is located under the baffle. The top of the reactor is connected with a rectification column, the number of theoretical plates of the rectification column is 30, and a condensing reflux device with a vent and a discharge port is arranged on the top of the rectification column.

[0025] First add 600 grams of cyclopentanol into the reactor, and then add 100 grams of modified amorphous Raney nickel catalyst with a particle size of 0.03 to 0.05 mm into the reactor, and place the catalyst on a baffle. The reactor is heated to 130-140° C., and then the cyclopentanol is pumped continuously into the reactor while maintaining the...

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Abstract

The invention is a kind of method to make the cyclopentanone from the cyclopentanol through the catalysis rectification. We get the cyclopentanone with high purity from the material of cyclopentanol after the catalysis dehydrogenation and rectification reaction. The temperature of the dehydrogenation reaction is between 130deg.C and 140deg.C and at the normal pressure. The catalyzer of the dehydrogenation reaction is granular Raney nickel metal alloy and is composed of Al-Ni-A. The A is one of the Cr, W, Mo or Fe and the weight ratio of the components is Al:Ni:A=1:(0.8 to 0.94):(0.03 to 0.2). The cyclopentanol charge of the catalyzer is between 0.3 hr-1 and 1.5 hr-1 and. The outcome of the dehydrogenation reaction is discharged in the gas phase and can be rectified directly and the reflux ratio is controlled between 1:1 and 10:1. The selectivity of the outcome reaches 100% and the conversion of the cyclopentanol and the purity of the outcome are 98%. It is featured by the low energy consumption, high conversion of the raw material, no by-product, low production cost and green technique.

Description

technical field [0001] The invention relates to a method for preparing cyclopentanone by dehydrogenating cyclopentanol, in particular to a method for converting cyclopentanol into cyclopentanone by dehydrogenating cyclopentanol at or near normal 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 the anti-anxiety drug buspirone. Cyclopentanone can be produced from the cyclopentene separated from the by-product C5 fraction of petroleum cracking to ethylene as raw material. The main processes include direct oxidation of cyclopentene and cyclopentene hydration-dehydrogenation. The defect of the direct oxidation method is that the conversion rate and the selectivity of the oxidation reaction are poor, and the preparation of cyclopentanol by the hydration of cyclop...

Claims

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Application Information

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IPC IPC(8): C07C45/00C07C49/395
CPCY02P20/10
Inventor 郭世卓徐泽辉黄亚茹夏蓉晖房鼎业
Owner SINOPEC SHANGHAI PETROCHEMICAL CO LTD
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