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Method for preparing isobutene by cracking methyl tert-butyl ether

A technology of methyl tert-butyl ether and isobutene, which is applied in the chemical industry, can solve the problems of lower real yield of isobutene, and achieve the effects of low cost, increased production capacity, and high purity

Active Publication Date: 2008-11-12
ZIBO QIXIANG TENGDA CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Only from the number of conversion rate and selectivity of the cracking reaction that are not much different, the impact on the performance yield is not very large, but unreacted methyl tert-butyl ether and by-products will be removed in the product refining process, During the removal process, a large amount of isobutene should be entrained. The higher the impurity content, the more entrainment, which will greatly reduce the true yield of isobutene.

Method used

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  • Method for preparing isobutene by cracking methyl tert-butyl ether

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Experimental program
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Effect test

Embodiment 1

[0024] The cracking reaction of methyl tert-butyl ether is carried out in a low-bed tube reactor with a tube length of 3.5 meters, using ML-01 catalyst, and a specific gravity of 0.5g / cm 3 , A white spherical silica catalyst with a diameter of 3-4mm, the height of the catalyst bed is 2 meters, the reaction temperature is 240-270°C, the reaction pressure is 0.08MPa, and the molar ratio of water to methyl tert-butyl ether is 1.0, Other operating conditions and results are shown in Table 1.

[0025] Table 1. Operating conditions and results

[0026] project

Embodiment 2

[0027] Example 2, the cracking reaction of methyl tert-butyl ether is carried out in a low bed tube reactor, the tube length is 3.5 meters, ML-01 catalyst is selected, and the stack specific gravity is 0.45g / cm 3 , A white spherical silica catalyst with a diameter of 3-4 mm, the height of the catalyst bed is 2 meters, the reaction temperature is 240-270 ° C, the reaction pressure is 0.05 MPa, and the molar ratio of water to methyl tert-butyl ether is 2.0, Other operating conditions and results are shown in Table 2.

[0028] Table 2. Operating conditions and results

[0029] project

Embodiment 3

[0039] The methyl tert-butyl ether cracking reaction is carried out in a low-bed tube reactor with a tube length of 3 meters, using ML-01 catalyst, and a specific gravity of 0.45g / cm 3 , White spherical silica series catalysts with a diameter of 3-4mm, the height of the catalyst bed is 2 meters, and the liquid phase space velocity is 6h -1 , the reaction temperature is 240-270°C, the reaction pressure is 0.06MPa, and the molar ratio of water to methyl tert-butyl ether is 3.0.

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Abstract

The invention relates to a method for making isobutene by cracking methyl tert-butyl ether, in particular to a method for making the isobutene by cracking the methyl tert-butyl ether after the heavier hydrocarbon removal, the lighter hydrocarbon removal, the refining and the gasification, belonging to the chemical engineering technical field. A novel trundle bed reactor, a novel high-activity catalyst and the 'yifanwuta' technique flow are adopted, wherein, the novel trundle bed reactor is a tube array reactor with a length between 1 and 3.5 meters; the novel high-activity catalyst is the white spherical silicon oxide system catalyst which is formed by the dropping beads method, with a bulk density between 0.4 and 0.5g / cm<3> and a diameter between 3 and 4 mm; the 'yifanwuta' technique flow comprises a pyrolyzer, a methyl tert-butyl ether refining gasification tower, a water-cooling ethanol washing tower, a methanol rectifying tower, an isobutene de-heavy fractionator and an isobutene de-light fractionator, and the water-cooling ethanol washing process is finished in the same tower. The method has great production ability, high converting efficiency, high selectivity, low cost and high product quality.

Description

technical field [0001] The invention relates to a method for producing isobutene by cracking methyl tert-butyl ether, in particular to a method for producing isobutene by cracking commercial methyl tert-butyl ether through de-heavy, de-light, refining and gasification, and belongs to the technical field of chemical industry. Background technique [0002] Isobutylene is an important chemical raw material, widely used in butyl rubber, polyisobutylene, pesticide intermediates, aromatic hydrocarbon alkylation, methacrylic acid and other chemical production fields, especially emerging industries such as butyl rubber and high molecular weight polyisobutylene, The requirement for isobutene is getting higher and higher, prompting the scientific and technical personnel working in this field to constantly explore new process equipment, new catalysts and new process methods, so as to produce high-quality isobutene products at low cost and meet the needs of different downstream users. n...

Claims

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Application Information

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IPC IPC(8): C07C11/09C07C1/20
Inventor 于元坤焦卫张敬真
Owner ZIBO QIXIANG TENGDA CHEM
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