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A kind of method for preparing methylcyclopentene

A technology for methylcyclopentene and methylcyclopentadiene, which is applied in the field of preparing methylcyclopentene, can solve the problems of low methylcyclopentene yield, high energy consumption, complicated process and the like, and achieves reduction of equipment. The effect of investment, reduction of operating costs, and simplification of separation and purification systems

Inactive Publication Date: 2016-07-27
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] As can be seen from the above, the existing technology for producing methylcyclopentene by hydrogenation of methylcyclopentadiene has the defects of complex process, high energy consumption and low yield of methylcyclopentene

Method used

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  • A kind of method for preparing methylcyclopentene
  • A kind of method for preparing methylcyclopentene
  • A kind of method for preparing methylcyclopentene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～8

[0025] Fill the catalyst in the fixed bed reactor, the catalyst is γ-Al 2 o 3 It is used as a carrier, Pd is used as an active component, and the content of Pd in ​​the catalyst is 0.3-1.0 wt%. The solvent, methylcyclopentadiene obtained by thermal cracking of dimethylcyclopentadiene, and hydrogen were mixed and then continuously passed through the reactor for hydrogenation reaction. The hydrogenation reaction conditions of each example are shown in Table 1. The contents of methylcyclopentadiene, methylcyclopentene and methylcyclopentane in the hydrogenation products were determined by gas chromatography, and the conversion rate of methylcyclopentadiene, methylcyclopentene and methylcyclopentene were calculated. The selectivity of pentane, the results are shown in Table 2.

[0026] Table 1.

[0027]

[0028] Table 2.

[0029]

Embodiment 9～18

[0031] The hydrogenation products obtained in Examples 1-8 are mixed and then separated and refined. The process flow is shown in the accompanying drawings.

[0032] The operating conditions of rectification tower 1, rectification tower 2, and rectification tower 3 are shown in Table 3, the refined methylcyclopentane purity that rectification tower 1 side line obtains, the refined methylcyclopentene that rectification tower 3 tower kettle obtains Purity, methylcyclopentene yield are shown in Table 4.

[0033] table 3.

[0034]

[0035] Table 4.

[0036]

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Abstract

Provided is a preparation method for methyl cyclopentene from methyl cyclopentadiene through continuous hydrogenation. The preparation method comprises steps: first, methyl cyclopentadiene, a solvent and hydrogen are mixed and subjected to a hydrogenation reaction through fixed bed catalyst bed layers continuously, the material weight ratio of methyl cyclopentadiene to the solvent is 1:(5-10), the mol ratio of methyl cyclopentadiene to hydrogen is 1: (2.0-4.0), and the catalyst employs Pd as an active component and has a content of 0.3-1.0wt%; second, the hydrogenation products are then subjected to removal of weight, removal of methyl cyclopentane and dehydrogenation to obtain methyl cyclopentene with a purity of being more than 99%, and the overall yield of methyl cyclopentene is more than 90%. The preparation method is advantageous in that the preparation method employs hydrogenation reaction by-product methyl cyclopentane as a reaction solvent, improves the separation and refining processes of methyl cyclopentene combined with hydrogenation product material composition, and ensures that the separation and refining processes of hydrogenation products are simplified and the yield of methyl cyclopentene is raised in the premise of good hydrogenation reaction effects.

Description

technical field [0001] The invention relates to a method for preparing methylcyclopentene, in particular to a method for preparing methylcyclopentene by continuous hydrogenation of methylcyclopentadiene with reaction by-product methylcyclopentane as a solvent. Background technique [0002] Methylcyclopentene is a branched cyclic monoolefin. It is a very scarce fine chemical raw material and can be used to produce various pesticides and synthesize various high-grade trimer polymer materials. In the prior art, there are few literature reports on the preparation of methylcyclopentene by hydrogenation of methylcyclopentadiene. In the selective hydrogenation of methylcyclopentadiene to methylcyclopentene, the side reaction of deep hydrogenation of methylcyclopentadiene to methylcyclopentane is usually unavoidable unless the methyl The conversion rate of cyclopentadiene is controlled at a lower level in order to pursue higher methylcyclopentene selectivity, but such process contr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C13/12C07C5/05
Inventor 黄勇孙春水吴卓黄彩凤李莹华建英
Owner CHINA PETROLEUM & CHEM CORP
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