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Method for preparing isobutylene by etherification

A technology of isobutylene and etherification, applied in the direction of producing hydrocarbons from oxygen-containing organic compounds, etc., can solve the problems of high energy consumption, high reaction temperature, single product, etc.

Inactive Publication Date: 2012-01-25
TIANJIN TAIYUAN INDAL GAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The problem to be solved by the present invention is to overcome the deficiencies of the prior art. The prior art is that isobutanol is dehydrated at 360 to 370° C. and 0.304 to 0.405 MPa (3 to 4 atm) (the catalyst is activated alumina) to obtain 86%-87% crude isobutene, and then refined isobutene can be obtained after rectification and removal of acetaldehyde, ether, and organic acids. The original method has high reaction temperature, high energy consumption, and single product

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  • Method for preparing isobutylene by etherification
  • Method for preparing isobutylene by etherification
  • Method for preparing isobutylene by etherification

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Embodiment 1

[0036] The separation of isobutene in the C4 fraction by etherification is divided into two steps:

[0037] The first step is the reaction of isobutylene and methanol in the C4 fraction to generate methyl tert-butyl ether (MTBE) under the catalysis of strongly acidic cation exchange resin;

[0038] The second step is to crack MTBE. The reaction of isobutene and methanol etherification into MTBE is reversible, so under appropriate conditions, MTBE can be decomposed into high-purity isobutene and methanol in contact with acidic catalysts. There are four types of acidic catalysts: supported sulfate catalysts, solid phosphoric acid catalysts Or ion exchange resin catalyst, see process for details figure 1 .

Embodiment 2

[0040] The separation of isobutene in the C4 fraction by etherification is divided into two steps:

[0041] The first step is the reaction of isobutylene and methanol in the C4 fraction to generate methyl tert-butyl ether (MTBE) under the catalysis of strongly acidic cation exchange resin;

[0042] The second step is to crack MTBE. The reaction of isobutene and methanol etherification into MTBE is reversible, so under appropriate conditions, MTBE can be decomposed into high-purity isobutene and methanol in contact with acidic catalysts. Among them, there are four types of acidic catalysts: supported sulfate catalysts, solid phosphoric acid catalysts or Ion exchange resin catalyst, see process for details figure 1 .

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Abstract

The invention discloses a technology for preparing isobutylene by using an etherification method. A method for separating isobutylene from C4 fractions by etherification comprises the following two steps: subjecting isobutylene in the C4 fractions to react with methanol under the catalytic action of strong acid cation exchange resin to generate methyl tertiary butyl ether (MTBE); and cracking the MTBE. The reaction between isobutylene and methanol for synthesizing the MTBE through etherification is reversible, therefore contacting with an acid catalyst, the MTBE can be decomposed into high-purity isobutylene and methanol under proper conditions. The method has reasonable processes, is simple in preparation, and is the simplest and most convenient and ideal technology for preparing isobutylene.

Description

technical field [0001] The invention relates to a chemical product, in particular to a technology for preparing isobutene by an etherification method, which is suitable for producing isobutene. Background technique [0002] (CH3)2C=CH 2 Also known as 2-methylpropene. Flammable and explosive gas (explosive limit 1.7% to 9.0% volume), boiling point -6.90°C, critical temperature 144.75°C, critical pressure 4.00MPa. Industrially, isobutene is almost always obtained from refinery gas and cracking C4 fractions (see C4 fractions). The content of isobutene in refinery gas is generally 5% to 12%, and the content of cracked C4 fraction is generally 20% to 30%. In a few cases, it is obtained by the catalytic dehydrogenation of isobutane using a chromia-alumina catalyst. When propylene and isobutane are used as raw materials to produce propylene oxide by co-oxidation, isobutene is its co-product. [0003] Separation of isobutene from the C4 fraction is usually carried out after fir...

Claims

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Application Information

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IPC IPC(8): C07C11/09C07C1/20
Inventor 原东凤
Owner TIANJIN TAIYUAN INDAL GAS
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