Method for preparing isoamylene from methyl tert-amyl ether

A technology of methyl tert-amyl ether and isopentene, which is applied in chemical instruments and methods, hydrocarbon production from oxygen-containing organic compounds, catalysts for physical/chemical processes, etc., can solve the abnormal fluctuation of catalyst bed temperature and the increase of energy consumption , product yield reduction and other problems, to achieve the effect of eliminating abnormal fluctuations in bed temperature, reducing content, conversion rate and selectivity.

Inactive Publication Date: 2009-12-09
SINOPEC SHANGHAI PETROCHEMICAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • 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 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 preparing isoamylene from methyl tert-amyl ether
  • Method for preparing isoamylene from methyl tert-amyl ether

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～10

[0023] 1. Thermal cracking of methyl tert-amyl ether

[0024] The reaction raw material is methyl tert-amyl ether obtained by reacting the carbon five fraction of the by-product of naphtha steam cracking to produce ethylene and methanol. After the methyl tert-amyl ether is heated and vaporized, it passes through the gas phase to modify α-Al by HF 2 O 3 The packed catalyst bed undergoes etherolysis reaction, and the reaction temperature is controlled at 180-230°C. The etherification reaction product water eluted methanol in it to obtain crude isoamylene. The components are shown in Table 1.

[0025] Table 1.

[0026] 2MB2

(wt%)

2MB1

(wt%)

2MB2 / 2MB1

(Quality ratio)

TAME

(wt%)

Isoprene dimer

(wt%)

Other impurities such as carbon five

74.18

25.04

2.96

0.57

0.04

Margin

[0027] 2. Isomerization reaction

[0028] The isomerization reaction was carried out in a stainless steel tubular fixed-bed reactor w...

Embodiment 3

[0039] The isomerization reaction product obtained in Example 3 is further subjected to rectification and refining, and refined isoamylene is produced in the side stream, and light component and heavy component impurities are discharged from the top of the tower and the bottom of the tower, respectively. The specific distillation conditions are shown in Table 4, and the refined isoamylene product is analyzed by chromatographic analysis. The main indicators are shown in Table 5.

[0040] Table 4.

[0041] Tower kettle temperature

(℃)

Tower top temperature

(℃)

Operating pressure

(MPa)

Reflux ratio

Example 11

125

68

0.50

3.0

Example 12

120

63

0.12

2.0

Example 13

123

65

0.30

3.0

Example 14

115

59

0.10

1.0

[0042] table 5.

[0043] 2MB2 content

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Abstract

The invention relates to a method for preparing isoamylene from methyl tert-amyl ether, which comprises the following steps: (1) carrying out ether analysis reaction to methyl tert-amyl ether through a catalyst bed layer in a gas phase at 130-300 DEG C; (2) removing methanol in a product of the ether analysis reaction so as to obtain a coarse isoamylene material; (3) adding tertiary amyl alcohol to the coarse isoamylene material, and then carrying out isomerization reaction through the catalyst bed layer in a liquid phase so as to ensure that 2-methyl-1-butylene in the coarse isoamylene is converted into 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 space velocity is 1-35 hr, the reaction temperature is 18-45 DEG C, and the reaction pressure is 0.3-1.0MPa. Sulfonic acid group cationic exchange resin is used as a catalyst, and the mass exchange capacity of the catalyst is 3-5.5 mmol/g. The method effectively restrains respective or mutual dimerization reaction of the 2-methyl-2-butylene and the 2-methyl-1-butylene in the process of the isomerization reaction.

Description

Technical field [0001] The present invention relates to a method for preparing isopentene from methyl tert-amyl ether, in particular to the isomerization reaction of crude isopentene obtained by etherolysis through a fixed-bed catalyst bed composed of sulfonic acid-based cation exchange resin , In order to increase the content of 2-methyl-2-butene in the method of preparing isoamylene. Background technique [0002] Isoamylene 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 content of 2-methyl-2-butene, the higher the application value. [0003] Isoamylene is mainly present in the carbon five fraction of catalytically cracked gasoline or the carbon five fraction produced by naphtha cracking to produce ethylene. Because these carbon five materials contain ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C11/09C07C1/20B01J31/10
CPCY02P20/52
Inventor 徐泽辉范存良周志刚赵剑萍曹强王禾常慧
Owner SINOPEC SHANGHAI PETROCHEMICAL CO LTD
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