Method for preparing isoamylene from tertiary amyl methyl ether

A technology of methyl tert-amyl ether and isopentene, applied in the direction of isomerization hydrocarbon production, organic chemistry, etc., can solve the problems of increasing the burden of product purification, achieve the elimination of abnormal fluctuations in bed temperature, overcome defects, and achieve high selective effect

Inactive Publication Date: 2011-05-04
CHINA PETROLEUM & CHEM CORP +1
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for preparing isoamylene from tertiary amyl methyl ether
  • Method for preparing isoamylene from tertiary amyl methyl ether
  • Method for preparing isoamylene from 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. The main composition of the etherolysis products is shown in Table 1.

[0026] Table 1.

[0027]

[0028] 2. Isomerization reaction

[0029] 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 catalyst is ...

Embodiment 11～15

[0042] 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.

[0043] Table 4.

[0044]

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
specific surface areaaaaaaaaaaa
pore sizeaaaaaaaaaa
Login to view more

Abstract

The invention discloses a method for preparing isoamylene from tertiary amyl methyl ether. The method comprises the following steps that: the tertiary amyl methyl ether passes through a catalyst bed in a gaseous phase to be subjected to ether cracking reaction; and a methanol-containing ether cracking reaction product passes through the catalyst bed in a liquid phase to be subjected to isomerization reaction so as to convert 2-methyl-1-butylene in the ether cracking reaction product into 2-methyl-2-butylene, wherein the catalyst is a hydrogen zeolite socony mobil (HZSM)-5 molecular sieve and has a ratio of silicate to aluminum of 20-50, a specific surface of 200 to 500m<2>/g and an average pore diameter of 2 to 8nm; and the isoamylene is obtained by removing the methanol from the isomerization reaction product. The method effectively inhibits dimerization reaction during the isomerization reaction; and the content of dimer in the product can be reduced to below 1 percent. In the method, only the sequence of process steps of the prior art is changed, other substances are not introduced into the reaction system, additional burden is not added to the purification or refining of the product, and the defects of 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 to further passing the isoamyl obtained from methyl tert-amyl ether through etherolysis through a fixed-bed catalyst bed composed of HZSM-5 molecular sieves Carry out 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-butene content, the higher the appli...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap