High-purity piperylene preparation method

A technology of crude piperylene and piperylene, which is applied in the field of preparation of high-purity piperylene, can solve the effect of affecting the application of piperylene, affect the subsequent application of piperylene, and cannot be removed at the same time Problems such as piperylene, to achieve the effect of reducing operating severity, reducing energy consumption, and improving product quality

Inactive Publication Date: 2019-05-07
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] CN103086822 discloses a method for separating piperylene, using n-pentane and 2-methyl-2-butene as an entrainer, adopting azeotropic distillation to separate piperylene, and crude piperylene can be Cyclopentadiene in the diene forms an azeotrope with n-pentane and 2-methyl-2-butene, thereby removing it, but it is ignored in the crude piperylene, except for cyclopentadiene and piperylene Diene is difficult to separate, and the impurity 2-butyne also exists in crude piperylene, which is difficult to separate and affects the effect of subsequent application of piperylene
[0005] It can be seen that the harmful impurities 2-butyne and cyclopentadiene in piperylene cannot be removed simultaneously in the prior art, thus affecting the subsequent application of piperylene

Method used

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Examples

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Embodiment 1～10

[0028] 1. Crude piperylene raw material

[0029] The crude piperylene used in Examples 1-10 is derived from the crude piperylene product obtained by separating cyclopentadiene and piperylene in a C5 separation device. Its components are shown in Table 1.

[0030] Table 1. Composition of crude piperylene

[0031] serial number

composition

Content / %(wt)

1

Cyclopentane

6.90

2

Cyclopentene

18.70

3

trans-1,3-pentadiene

44.30

4

cis-1,3-pentadiene

26.70

5

Cyclopentadiene

0.80

6

Carbon six and others

2.60

[0032] Two, piperylene de-alkyne

[0033]

[0034] Wherein (2-butyne content) in is the content of 2-butyne at the inlet; (2-butyne content) out is the content of 2-butyne at the outlet.

[0035] The performance parameters of 13x molecular sieve are shown in Table 2

[0036] Table 2

[0037]

[0038] The adsorption de-alkyne reaction of the C5 fraction is carried out in a ...

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Abstract

The invention discloses a high-purity piperylene preparation method, wherein isoprene and cyclopentadiene are removed from C5 distillate, the obtained C5 distillate is used as a raw material, and treatment is performed through adsorption and extraction rectification to obtain the high-purity piperylene. With the method of the present invention, a small of difficultly-removed cyclopentadiene and 2-butyne can be effectively removed from piperylene; the process is simple and effective; and with the method, the high-purity piperylene with the cyclopentadiene content of less than 50 ppm and the 2-butyne content of less than 20 ppm can be obtained.

Description

technical field [0001] The invention relates to a method for preparing high-purity piperylene, which uses crude piperylene from which isoprene and cyclopentadiene have been removed as a raw material, and adopts a combined process of extractive distillation and chemical adsorption to prepare high-purity piperylene. Pentadiene method. Background technique [0002] In the process of producing ethylene from petroleum cracking, a considerable amount of C5 fraction is produced by-product, and the C5 fraction is rich in diolefins such as piperylene, isoprene and cyclopentadiene. These diolefins are active in chemical properties and are important resources for chemical utilization. The mixed carbon five (hereinafter referred to as crude piperylene) obtained by the carbon five separation process is composed of piperylene 65 ~ 75wt%, and the total content of cyclopentene and cyclopentane is 18 ~ 25wt%, about 2% cyclopentadiene and alkynes, a small amount of other C5 hydrocarbons and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C7/00C07C7/13C07C11/20
Inventor 傅建松常慧
Owner CHINA PETROLEUM & CHEM CORP
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