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Method for increasing content of 2-methyl-2-butene in isoamylene

A technology of isopentene and methyl is applied in the field of increasing the content of 2-methyl-2-butene in isopentene, and can solve the problems of reduced product yield, increased energy consumption, abnormal fluctuation of catalyst bed temperature, and the like, Achieve the effect of improving conversion rate and selectivity, reducing the content of dimer, and eliminating abnormal fluctuation of catalyst bed temperature

Active Publication Date: 2010-06-09
SINOPEC SHANGHAI PETROCHEMICAL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the dimer can be removed through the refining process, this will lead to a decrease in product yield and an increase in energy consumption
On the other hand, the reaction heat of the dimerization reaction will also cause abnormal fluctuations in the temperature of the catalyst bed, making it difficult to control the isomerization reaction smoothly.

Method used

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  • Method for increasing content of 2-methyl-2-butene in isoamylene
  • Method for increasing content of 2-methyl-2-butene in isoamylene

Examples

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Embodiment 1～10

[0019] 1. Raw material isopentene

[0020] The raw material isopentene used in Examples 1-10 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 then subjected to high-temperature etherolysis and water elution In addition to methanol obtained. The composition of crude isopentene is shown in Table 1.

[0021] Table 1.

[0022] 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

[0023] 2. Isomerization reaction

[0024] 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 increasing the content of 2-methyl-2-butene in isoamylene, which comprises the following steps of: adding water into a raw material isoamylene, and then carrying out an isomerization reaction on the mixture through a fixed bed catalyst bed layer formed from sulfonic cation exchange resin so as to enable 2-methyl-1-butene in the raw material isoamylene to be converted into the 2-methyl-2-butene. The addition of the water is 0.03-0.10wt% by using the raw material isoamylene as a reference, the mass transfer capability of the sulfonic cation exchange resin is 3-5.5mmol / g, the mass airspeed is 1-35hr-1, the reaction temperature is 18-45 DEG C, and the reaction pressure is 0.3-1.0MPa. Through the inhibition of a dimerization reaction, the invention greatlylowers the content of dimer in an isomerization reaction product to be lower than 1 percent and basically eliminates the phenomenon of catalyst bed layer temperature abnormal fluctuation caused by the heat release of the dimerization reaction, so that the reaction always proceeds in a steady state.

Description

technical field [0001] The invention relates to a method for increasing the content of 2-methyl-2-butene in isopentene, in particular to carrying out isomerization reaction of raw isopentene through a fixed-bed catalyst composed of sulfonic acid-based cation exchange resin, A method for isomerizing 2-methyl-1-butene in isopentene to 2-methyl-2-butene to increase the content of 2-methyl-2-butene in isopentene. Background technique [0002] Isoamylene is an important chemical raw material used in the production of resins and pesticide intermediates. Isoamylene is usually a mixture of 2-methyl-2-butene and 2-methyl-1-butene, since for most reactions only 2-methyl-2-butene is the active ingredient, so The higher the content of 2-methyl-2-butene in isopentene, 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 conta...

Claims

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Application Information

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IPC IPC(8): C07C11/10C07C5/25B01J31/10
Inventor 徐泽辉范存良曹强夏蓉晖孙骏赵剑萍
Owner SINOPEC SHANGHAI PETROCHEMICAL CO LTD
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