Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Preparation method for methyl cyclopentene

A technology for methylcyclopentene and methylcyclopentadiene, applied in the field of preparing methylcyclopentene, can solve the problems of high energy consumption, complex process, low yield of methylcyclopentene, etc. Cost, simplification of separation and purification system, and effect of reducing equipment investment

Active Publication Date: 2013-12-04
CHINA PETROLEUM & CHEM CORP +1
View PDF2 Cites 7 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation method for methyl cyclopentene
  • Preparation method for methyl cyclopentene
  • Preparation method for methyl cyclopentene

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]

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com