Method for improving content of 2-methyl-2-butylene in coarse isoamylene

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

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

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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 wil

Method used

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  • Method for improving content of 2-methyl-2-butylene in coarse isoamylene
  • Method for improving content of 2-methyl-2-butylene in coarse isoamylene

Examples

Experimental program
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Embodiment 1～10

[0017] 1. Raw materials for isomerization reaction

[0018] The raw material used in Examples 1 to 12 is crude isopentene, and the C5 fraction produced by steam cracking of naphtha to produce ethylene is reacted with methanol to obtain methyl tertiary amyl ether, which is then subjected to pyrolysis and water elution to remove methanol to obtain . 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 impurities such as carbon five

74.18

25.04

2.96

0.57

0.04

margin

[0021] 2. Isomerization reaction

[0022] The isomerization reaction was 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 catalyst with a particle size of 0.40-1.25 mm is loaded into the reactor...

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Abstract

The invention relates to a method for improving the content of 2-methyl-2-butylene in coarse isoamylene, which comprises the following steps: tert butyl alcohol is added to the coarse isoamylene; and then the coarse isoamylene with the tert butyl 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 2-methyl-1-butylene in the coarse isoamylene is converted into the 2-methyl-2-butylene, wherein the addition of the tert butyl alcohol takes the coarse isoamylene as a reference and is 0.2-2.2 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 1-35 hr; the reaction temperature is 18-45 DEG C; and the reaction pressure 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 increasing the content of 2-methyl-2-butene in crude isopentene, in particular to the isomerization of crude isopentene through a fixed-bed catalyst bed composed of a sulfonic acid-based cation exchange resin Reaction, a method for increasing the content of 2-methyl-2-butene in crude isopentene. Background technique [0002] Isopentene is an important chemical raw material used in the production of resins and pesticide intermediates. Isopentene 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, isopentene The higher the 2-methyl-2-butene content, the higher the application value. [0003] Isopentene mainly exists in the C5 fraction of catalytically cracked gasoline or the C5 fraction produced by cracking naphtha to ethylene. Since these C5 materials contain many compounds with very close boiling points, isopentenes are not ea...

Claims

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Application Information

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IPC IPC(8): C07C5/25C07C11/09B01J31/10
Inventor 唐豪王世明范存良夏蓉晖孙骏汤育娟
Owner SINOPEC SHANGHAI PETROCHEMICAL CO LTD
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