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Method of producing isobutene joint producing dimetylether and dipolyisobutene

A dimerized isobutylene and isobutylene technology, which is applied in chemical instruments and methods, preparation of organic compounds, hydrocarbon production from oxygen-containing organic compounds, etc., can solve the problem of low purity of dimerized isobutylene products, increased equipment costs and operating costs, etc. problem, to achieve the effect of improving conversion rate, saving equipment investment and improving utilization rate

Inactive Publication Date: 2004-05-05
中国石油化工股份有限公司北京燕山分公司研究院
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Problems solved by technology

[0013] Dimeric isobutylene is also a useful intermediate of chemical raw materials and organic raw materials. Its production methods mainly include sulfuric acid extraction, superposition of pure isobutene and selective superposition of mixed carbon four. The first two methods have the problem of sulfuric acid corrosion. There is no corrosion problem in the carbon four selective superimposition method, but the product purity of dimeric isobutylene is not high
Although this method can simultaneously obtain isobutylene and dimerized isobutylene products, due to the addition of a dimerization reactor, the corresponding increase in equipment costs and operating costs

Method used

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  • Method of producing isobutene joint producing dimetylether and dipolyisobutene

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preparation example Construction

[0044] The preparation method of the catalyst used in embodiment 1~embodiment 6 is as follows:

[0045] Dissolve 47 grams of analytically pure concentrated sulfuric acid (concentration 98%) in distilled water to prepare 200 ml of sulfuric acid aqueous solution, and 150 ml of gamma-Al 2 o 3 The carrier is immersed in the above solution for 2 hours, the residual liquid is filtered off, the impregnated carrier is dried at 120°C for 4 hours, and then roasted at 550°C for 4 hours, and then the catalyst is continued to be immersed in the above sulfuric acid aqueous solution for 2 hours. After drying at ℃ for 4 hours, and then calcining at 550℃ for 4 hours, the sulfate content in the prepared catalyst was 22.12wt.%.

Embodiment 7

[0046] The preparation method of catalyst used in embodiment 7 is as follows:

[0047] Dissolve 88 grams of analytically pure ammonium sulfate in distilled water to prepare 200 ml of ammonium sulfate aqueous solution, and 150 ml of γ-Al 2 o 3 The carrier was immersed in the above solution for 2 hours, and the raffinate was filtered off. The impregnated carrier was dried at 120°C for 4 hours, and then calcined at 550°C for 4 hours. The sulfate content in the prepared catalyst was 22.08wt.%.

Embodiment 8

[0048] The preparation method of catalyst used in embodiment 8 is as follows:

[0049] 83 grams of analytically pure ferrous sulfate (FeSO 4 7H2O) was dissolved in distilled water to make 200ml ferrous sulfate aqueous solution, and 150ml γ-Al 2 o 3 The carrier is immersed in the above solution for 2 hours, the residual liquid is filtered off, the impregnated carrier is dried at 120°C for 4 hours, and then calcined at 250°C for 4 hours, and then the catalyst is continued to be immersed in the above ferrous sulfate aqueous solution for 2 hours, After drying at 120°C for 4 hours, and then calcining at 250°C for 4 hours, the sulfate content in the prepared catalyst was 21.97wt.%.

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Abstract

A process for preparing isobutylene along with dimethylether and dipolyisobutylene includes cracking reaction of methyl tert-butyl ether (MTBE) in the reactor containing solid acid catalyst at 230-270 deg.c, dewatering part of resultant methanol to obtain dimethylether, and further polymerizing part of isobutylene to obtain dipolyisobutylene.

Description

technical field [0001] The invention relates to a method for producing isobutene and co-producing dimethyl ether and dimerized isobutylene (also known as diisobutylene), especially utilizing methyl tert-butyl ether (MTBE) cracking to produce isobutylene and co-producing dimethyl ether and dimerized isobutylene Methods. Background technique [0002] Isobutylene is an important raw material for fine chemicals, and also an important intermediate raw material or monomer for synthetic rubber and synthetic resin. Dimeric isobutylene is an intermediate product of detergent and an important raw material for the production of various chemical and fine chemical products such as octylphenol, octylamine and octyldiphenylamine. Dimethyl ether is also an important chemical raw material. It is widely used in pesticides, medicines, dyes and daily chemical industries. It is also an aerosol propellant and refrigerant with superior performance. An ideal substitute, high-purity dimethyl ether...

Claims

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Application Information

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IPC IPC(8): C07C1/20C07C11/02C07C11/09C07C41/18C07C43/04
Inventor 周继东韩春国姚振卫刘敏李学雷张洪江李建中
Owner 中国石油化工股份有限公司北京燕山分公司研究院
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