Method for isomerizing 2-methyl-1-butylene into 2-methyl-2-butylene

A technology of butene and methyl, which is applied in the field of increasing the content of 2-methyl-2-butene in crude isopentene, can solve the problems of product yield reduction, abnormal fluctuation of catalyst bed temperature, and increase of energy consumption. Achieve the effects of improving conversion rate and selectivity, eliminating abnormal fluctuations in bed temperature, and reducing the content of dimers

Inactive Publication Date: 2009-12-09
SINOPEC SHANGHAI PETROCHEMICAL CO LTD
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, while the isomerization reaction is carried out, 2-methyl-2-butene and 2-methyl-1-butene are all prone to dimerization reactions individually or with each other. Dimer content will reach about 4wt%
Although the dimer can be removed through the refining process, this ...

Method used

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  • Method for isomerizing 2-methyl-1-butylene into 2-methyl-2-butylene
  • Method for isomerizing 2-methyl-1-butylene into 2-methyl-2-butylene

Examples

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Embodiment 1～10

[0017] 1. Raw materials for isomerization reaction

[0018] The raw material used in Examples 1-12 is crude isopentene, and the C5 fraction produced by steam cracking of naphtha to produce ethylene is reacted with methanol to obtain methyl tert-amyl ether, which is obtained after high-temperature cracking and water elution to remove methanol . The composition of crude isopentene is shown in Table 1.

[0019] Table 1.

[0020] 2MB2

(wt%)

2MB1

(wt%)

2MB2 / 2MB1

(mass ratio)

TAME

(wt%)

Isoprene dimer

(wt%)

Other carbon five and other impurities

74.18

25.04

2.96

0.57

0.04

margin

[0021] 2. Isomerization reaction

[0022] The isomerization reaction is carried out in a stainless steel tubular fixed-bed reactor with a size of φ25mm×1500mm. 40 grams of spherical sulfonic acid-based cation exchange resin catalysts with a particle size of 0.40-1.25 mm are loaded into the react...

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Abstract

The invention relates to a method for isomerizing 2-methyl-1-butylene into 2-methyl-2-butylene, which is used for improving the content of the 2-methyl-2-butylene in coarse isoamylene. The method comprises the following steps: tertiary amyl alcohol is added to the coarse isoamylene; and then the coarse isoamylene with the tertiary amyl alcohol is subjected to an isomerization reaction through a fixed bed catalyst bed layer consisting of sulfonic acid group cation exchange resin so as to ensure that the 2-methyl-1-butylene in the coarse isoamylene is converted into the 2-methyl-2-butylene, wherein the addition of the tertiary amyl alcohol takes the coarse isoamylene as a reference and is 0.1-2.0 percent by weight; the mass exchange capacity of the sulfonic acid group cation exchange resin is 3-5.5 mmol/g, and the mass space velocity is 1-35hr; the reaction temperature is 18-45 DEG C; and the reaction pressire is 0.3-1.0 MPa. The method effectively restrains respective or mutual dipolymer reactions of the 2-methyl-2-butylene and the 2-methyl-1-butylene in the process of the isomerization reaction.

Description

technical field [0001] The invention relates to a method for isomerizing 2-methyl-1-butene into 2-methyl-2-butene, in particular to passing crude isopentene through a fixed-bed catalyst made of sulfonic acid-based cation exchange resin The bed is subjected to isomerization reaction to increase the content of 2-methyl-2-butene in crude isopentene. Background technique [0002] Isoamylene is an important chemical raw material used in the production of resins and pesticide intermediates. Isoamyl is usually a mixture of 2-methyl-2-butene and 2-methyl-1-butene. Since only 2-methyl-2-butene is the active ingredient for most reactions, isoamyl The higher the 2-methyl-2-butene content, the higher the application value. [0003] Isoamylene mainly exists in the C5 fraction of catalytically cracked gasoline or the C5 fraction produced by naphtha cracking to produce ethylene. Since these C5 materials contain many compounds with very close boiling points, it is not easy to separate is...

Claims

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Application Information

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IPC IPC(8): C07C11/09C07C5/25B01J31/10
Inventor 徐泽辉夏蓉晖曹强孙骏赵剑萍方玲
Owner SINOPEC SHANGHAI PETROCHEMICAL CO LTD
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