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Method for preparing isoamylene by using tertiary amyl methyl ether

A technology of methyl tert-amyl ether and isopentene, which is applied in the field of isopentene from methyl tert-amyl ether, can solve problems such as increasing the burden of product purification, eliminate abnormal fluctuations in catalyst bed temperature, overcome defects, The effect of reducing content

Inactive Publication Date: 2011-05-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But its disadvantage is that another substance is introduced into the reaction system, which obviously increases the burden of product purification

Method used

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  • Method for preparing isoamylene by using tertiary amyl methyl ether
  • Method for preparing isoamylene by using tertiary amyl methyl ether
  • Method for preparing isoamylene by using tertiary amyl methyl ether

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～10

[0024] 1. Thermal cracking of methyl tert-amyl ether

[0025] The raw material for the reaction is the methyl tert-amyl ether obtained by reacting the by-product C5 fraction produced by steam cracking of naphtha to ethylene and methanol. After methyl tert-amyl ether is heated and vaporized, the α-Al is modified by HF in the gas phase. 2 o 3 The packed catalyst bed carries out etherolysis reaction, and the reaction temperature is controlled at 180-230°C.

[0026] The main composition of the etherolysis products is shown in Table 1.

[0027] Table 1.

[0028]

[0029] 2. Isomerization reaction

[0030] The reaction is carried out in a φ25mm×1500mm stainless steel tubular reactor, and a temperature-controlled jacket of circulating hot water is installed outside the reactor. Catalysts are filled in the reactor to form a fixed-bed catalyst bed, and temperature-measuring platinum resistors are respectively installed on the top, middle and bottom of the catalyst bed. The cat...

Embodiment 11～15

[0043] The isopentene obtained in Examples 1-10 is mixed and then rectified and refined. The rectification tower is a packed tower with 40 theoretical plates. Refined isopentene is produced from the side line, and light components and heavy components are discharged from the top and bottom of the tower respectively. The specific process conditions and the purity of the refined isoamylene product are shown in Table 4.

[0044] Table 4.

[0045]

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Abstract

The invention relates to a method for preparing isoamylene by using tertiary amyl methyl ether, comprising: etherification reaction is carried out on the gas-phase tertiary amyl methyl ether by a catalyst bed layer; isomerization reaction is carried out on liquid-phase methanol-contained products in etherification reaction by means of the catalyst bed layer, so that 2-methyl-1-butylene in the etherification products is transformed into 2-methyl-2-butylene,wherein the quality air speed is 1-30hr<-1>, the reaction temperature is 20-47 DEG C, the reaction pressure is 0.3-1.0MPa, a catalyst is sulfonic cation exchange resin, and the quality exchange capacity is 3-5.5mmol / g; the methanol is removed from the products in the isomerization reaction, thus the isoamylene is obtained. By utilizing the method provided by the invention, the dimerization reaction during the isomerization reaction is effectively inhibited, thus the content of biopolymers in the product can be reduced to below 1%; only the sequence of the technical steps in the prior art is changed, other matters are not introduced into a reaction system, extra load can not be added for purifying or refining the product, and the defects in the prior art are effectively overcome.

Description

technical field [0001] The present invention relates to a method for preparing isoamyl from methyl tert-amyl ether, and relates to isoamyl obtained by etherolysis of methyl tert-amyl ether and further passing through a fixed-bed catalyst bed composed of sulfonic acid-based cation exchange resin The layer is subjected to isomerization reaction to increase the method of 2-methyl-2-butene content therein. Background technique [0002] Isoamylene is an important chemical raw material, which is used to produce pinacolone, and then to produce high-efficiency triazole fungicides, plant growth regulators, herbicides, etc. Isoamylene is also used as an intermediate for many fragrances and pesticides, as well as an ultraviolet absorber, photographic photosensitive material and concrete dispersant. 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-b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C11/10C07C5/25
Inventor 徐泽辉范存良常慧汤育娟朱瑶
Owner CHINA PETROLEUM & CHEM CORP
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