Method for preparing isoamylene by taking tertiary amyl methyl ether as raw material

A technology for methyl tert-amyl ether and isopentene, which is applied in the field of preparing isopentene, can solve the problems of abnormal fluctuation of catalyst bed temperature, increased energy consumption, and reduced product yield, and can eliminate abnormal fluctuation of bed temperature. phenomenon, the effect of reducing content, conversion and selectivity improvement

Active Publication Date: 2012-10-24
SINOPEC SHANGHAI PETROCHEMICAL CO LTD
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  • 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 by taking tertiary amyl methyl ether as raw material
  • Method for preparing isoamylene by taking tertiary amyl methyl ether as raw material

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Experimental program
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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 fixed-bed catalyst bed undergoes etherolysis reaction, and the reaction temperature is controlled at 180-230°C. The etherification reaction product was washed with water to remove methanol from it to obtain crude isoamylene. The main composition of crude isoamylene is shown in Table 1.

[0025] Table 1.

[0026] 2MB2

(wt%) 2MB1

(wt%) 2MB2 / 2MB1

(Quality ratio) TAME

(wt%) Isoprene dimer

(wt%)

Other carbon five impurities 74.1825.042.960.570.04margin

[0027] 2. Isomerization reaction

[0028] The isomerization reaction was carried out in a stainless steel tubular fixed-bed reactor with a size of φ25mm×1500mm. ...

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 the light component and the heavy component impurities are respectively discharged from the tower top and the tower bottom. The specific distillation conditions are shown in Table 4. The refined isoamylene product is analyzed by chromatography. The main indicators are shown in Table 5.

[0040] Table 4.

[0041]

Tower kettle temperature

(℃) Top temperature

(℃) Operating pressure

(MPa) Reflux ratio

Example 11125680.503.0 Example 12121630.152.0 Example 13122640.303.0 Example 14 115590.101.0

[0042] table 5.

[0043]

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Abstract

The invention relates to a method for preparing isoamylene by taking tertiary amyl methyl ether as raw material, comprising the following steps: making methyl tert-amyl ether to be subjected to decomposition reaction at 130-300 DEG C with the gas phase through a catalyst bed layer; removing methanol in the products of decomposition reaction to obtain rough isoamylene; and adding water to the rough isoamylene to enable the rough isoamylene to be subjected to the isomerization reaction through a fixed bed catalyst bed layer which is formed by sulfonic cation exchange resin and enable 2-methyl-1-butene in the rough isoamylene to be converted into 2-methyl-2- butane, wherein the addition amount of the water is 0.03-0.10 percent by weight of the rough isoamylene, and the mass exchange capacityof the sulfonic cation exchange resin is 3-5.5 mmol / g, the mass space velocity is 1-35hr-1, the reaction temperature is 18-45 DEG C and the reaction pressure is 0.3-1.0 MPa. The invention effectivelycontrols the occurence of the dimerization reaction in the isomerization reaction process.

Description

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

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C1/20C07C11/10C07C5/25B01J31/10
CPCY02P20/52
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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