Production method for preparing isobutylene by adsorption separation

A technology for adsorption separation and isobutene, applied in adsorption purification/separation, 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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  • Production method for preparing isobutylene by adsorption separation

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Embodiment 1

[0016] The 5A molecular sieve modified with calcium adopts the multi-stage bed adsorption method. In order for the adsorbent to process C4 materials continuously, there are three fixed bed adsorbers, that is, one reactor for adsorption, one for desorption and one for regeneration; the process of adsorption and desorption is at 100°C and 101.325kPa pressure conduct. The adsorption liquid is rectified to remove a small amount of n-butane and 2-butene, and the final 1-butene purity is >99.0%; the vaporized C4 material is passed into the first adsorption tower that has been washed with n-hexane in advance, At this time, the desorption of n-hexane occurs on the one hand, and the adsorption of n-butene occurs on the other hand; the desorbed n-hexane and isobutene are discharged from the top of the tower, and after isobutene is separated, n-hexane returns to the system for recycling. See the process for details figure 1 .

Embodiment 2

[0018] The 5A molecular sieve modified with calcium adopts the multi-stage bed adsorption method. In order for the adsorbent to process C4 materials continuously, there are three fixed bed adsorbers, that is, one reactor for adsorption, one for desorption and one for regeneration; the process of adsorption and desorption is at 100°C and 101.325kPa pressure conduct. The adsorption liquid is rectified to remove a small amount of n-butane and 2-butene, and the final 1-butene purity is >99.0%; the vaporized C4 material is passed into the first adsorption tower that has been washed with n-hexane in advance, At this time, the desorption of n-hexane occurs on the one hand, and the adsorption of n-butene occurs on the other hand; the desorbed n-hexane and isobutene are discharged from the top of the tower, and after isobutene is separated, n-hexane returns to the system for recycling. See the process for details figure 1 .

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Abstract

The invention discloses a method for preparing isobutylene by adsorption separation. The method is characterized in that molecular sieve adsorbents with high selectivity are adopted; an adsorption method is adopted for separating isobutylene; the adsorbents are calcium modified 5A molecular sieves; a multistage bed adsorption method is adopted; in order to ensure that the adsorbents can continuously process C4 materials, at least three fixed bed adsorbers are simultaneously required, namely an adsorber for adsorption, an adsorber for desorption and a reactor for generation (burning); as the surfaces of the adsorbents have acidity, the adsorption and desorption processes are carried out at the temperature of 100 DEG C and pressure of 101.325kPa; the adsorption solution is rectified to remove a small amount of n-butane and 2-butylene; and the purify of the finally obtained 1-butylene is greater than 99.0%. 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 adsorption separation 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 af...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C11/09C07C7/12
Inventor 原东凤
Owner TIANJIN TAIYUAN INDAL GAS
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