Method for preparing isobutylene by using adsorption separation method

A technology for adsorption separation and isobutene, which is applied in the direction of adsorption purification/separation, etc., which can solve the problems of limited application and low reaction efficiency.

Inactive Publication Date: 2012-01-25
天津东方宜信物流有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ion exchange resin method can also obtain high-purity isobutene, but because of low reaction efficiency, it is not widely used

Method used

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  • Method for preparing isobutylene by using adsorption separation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] C4 material adopts calcium-modified 5A molecular sieve, multi-section bed adsorption method, at least three fixed bed adsorbers, that is, one adsorption, one desorption and one regeneration (burning) reactor; simultaneously add weight parts 0.1 of the polymerization inhibitor; using 1 times the weight of n-hexane and heptane as desorbent, the adsorption and desorption process is carried out at 100 ℃ and 101.325kPa pressure; the adsorption liquid is rectified to remove A small amount of n-butane and 2-butene, the final 1-butene purity > 99.0%; the vaporized C4 material is passed into the first adsorption tower washed with n-hexane in advance, and the desorbed n-hexane and isobutene are obtained by It is discharged from the top of the tower, and after isobutene is separated, n-hexane is returned to the system for recycling. The specific process is shown in figure 1 .

Embodiment 2

[0013] C4 material adopts calcium-modified 5A molecular sieve, multi-section bed adsorption method, at least three fixed bed adsorbers, that is, one adsorption, one desorption and one regeneration (burning) reactor; simultaneously add weight parts 1 times the polymerization inhibitor; 10 parts by weight of n-hexane and heptane were added as desorbents, and the adsorption and desorption processes were carried out at 100°C and 101.325kPa pressure; the adsorption liquid was rectified to remove A small amount of n-butane and 2-butene, the final 1-butene purity > 99.0%; the vaporized C4 material is passed into the first adsorption tower washed with n-hexane in advance, and the desorbed n-hexane and isobutene are obtained by It is discharged from the top of the tower, and after isobutene is separated, n-hexane is returned to the system for recycling. The specific process is shown in figure 1 .

Embodiment 3

[0015] C4 material adopts calcium-modified 5A molecular sieve, multi-section bed adsorption method, at least three fixed bed adsorbers, that is, one adsorption, one desorption and one regeneration (burning) reactor; simultaneously add weight parts 0.5 of the polymerization inhibitor; using 5 times the weight of n-hexane and heptane as the desorbent, the adsorption and desorption process is carried out at 100 ° C and 101.325kPa pressure; the adsorption liquid is rectified to remove A small amount of n-butane and 2-butene, the final 1-butene purity > 99.0%; the vaporized C4 material is passed into the first adsorption tower washed with n-hexane in advance, and the desorbed n-hexane and isobutene are obtained by It is discharged from the top of the tower, and after isobutene is separated, n-hexane is returned to the system for recycling. The specific process is shown in figure 1 .

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Abstract

The invention discloses a method for preparing isobutylene by using an adsorption separation method. The method is characterized in that calcium modified 5A molecular sieves are adopted as adsorbents with high selectivity; 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); at the same time, polymerization inhibitors are added and high temperature operation is prevented; n-hexane, heptane and the like are adopted as desorption agents; adsorption and desorption processes are carried out at the temperature of 100 DEG C and pressure of 101.325kPa; the vaporized C4 materials are pumped into a first adsorption tower which is washed with n-hexane in advance, and at the moment, the desorption effect of n-hexane is generated on the one hand and the adsorption effect on n-butylene is generated on the other hand; n-hexane after desorption and isobutylene are discharged from the tower top; and after isobutylene is separated, n-hexane returns to a system for recycling. The preparation method disclosed by the invention is one of the best methods for preparing isobutylene.

Description

technical field [0001] The invention relates to a chemical product, in particular to a technique for preparing isobutene by an adsorption separation method, which is suitable for chemical synthesis of isobutene. Background technique [0002] Isobutene (CH3) 2C=CH2 is 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. Isobutene is almost exclusively obtained from refinery gases and cracked 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. Separation of isobutene from the C4 fraction is usually carried ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C11/09C07C7/12
Inventor 梁喜乐
Owner 天津东方宜信物流有限公司
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