Preparation method for high purity isobutylene

An isobutene, high-purity technology, applied in the field of high-purity isobutene preparation, can solve problems such as difficult problems, achieve the effects of reducing production costs, sufficient raw material sources, and simple extraction process

Inactive Publication Date: 2015-01-21
ZHUHAI FEIYANG NOVEL MATERIALS +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0015] It can be seen that the four high-purity isobutene preparation methods listed above all have certain disadvantages, and the preparation of high-purity isobutene is still an industry problem that needs to be solved

Method used

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  • Preparation method for high purity isobutylene

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[0031] A method for preparing high-purity isobutylene provided by the invention comprises the step of continuously catalytically cracking an acidic catalyst and a polyol ether at a temperature of 80-200°C and a pressure of 0.2-2Mpa at a space velocity of 0.8-10 / h to obtain The step of further rectifying the crude isobutene to obtain high-purity isobutene.

[0032] As can be seen from the above description, the beneficial effects of the present invention are: a method for preparing isobutene using a polyol ether set acidic catalyst is proposed, which saves the complicated steps of multiple column washing and rectification, so the extraction process of isobutene is simple, Continuous catalytic cracking and fractionation without producing waste water, recycling of polyols produced by cracking, low material loss, greatly reduced production costs, so this method has the advantage of sufficient raw material sources, and the preparation process can be stable, high yield, Selective wa...

Embodiment 1

[0034] In the above method, the polyol ether is prepared by addition synthesis of mixed C4 fractions and polyols under an acidic catalyst.

[0035] The present invention proposes for the first time that polyol ethers are used as raw materials for the preparation of isobutylene, and in this embodiment, polyol ethers are prepared from polyols and mixed C4 fractions, and this method is suitable for industrial mass production. Optimally, the molar ratio of dihydric alcohol to isobutylene in this patent is 1:1-4:1. Preferably 1.5:1-2.5:1.

[0036] The mixed C4 fraction in this embodiment is cracked C4 fraction, which contains 20% to 30% isobutene, and the remaining components are butadiene, n-butene, n-butane, isobutane and the like.

[0037] The polyol in this embodiment can use at least one of ethylene glycol, propylene glycol, butylene glycol, diethylene glycol, dipropylene glycol, polyethylene glycol or polypropylene glycol.

Embodiment 2

[0039] In the above method, crude isobutene is obtained after the catalytic cracking and co-produced to obtain polyols, and the co-produced polyols are used to prepare polyol ethers.

[0040] Through the process of using polyol ether as the raw material for the preparation of isobutylene proposed by the present invention for the first time, polyols can be co-produced after the catalytic cracking of the preparation process of the present invention, and the polyols can participate in the subsequent preparation of polyol ethers. , to realize the recycling of raw materials.

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Abstract

The invention provides a preparation method for high purity isobutylene. Polyol ether is adopted as the preparation raw material of isobutylene, which reacts with a proper catalyst under certain temperature, pressure and space velocity conditions to obtain a crude product, and the crude product is further subjected to refined distillation so as to obtain high purity isobutylene. Accordingly, the materials can be recycled, the generation of wastewater and material loss can be avoided, and the complex steps of multi-pillar washing and rectification can be omitted. Therefore, the extraction process of isobutylene is simple, continuous catalytic cracking fractionation can be realized, no wastewater is generated, the cracking generated polyol can be recycled, the material loss is low, and the production cost is greatly reduced. Thus, the method has the advantage of abundant raw material sources, and polyol ether can be prepared from mixed C4 fractions without side reaction in a stable, high yield and high selectivity way.

Description

technical field [0001] The invention relates to a process for preparing chemical raw materials, in particular to a method for preparing high-purity isobutene. Background technique [0002] Isobutene is the raw material and intermediate of many industrial organic synthesis. Industrially high-purity isobutene is mainly used to produce polyisobutene and copolymerize with isoprene to produce butyl rubber. With the widespread use of gasoline additives methyl tert-butyl ether and ethyl tert-butyl ether, the demand and output of isobutylene have increased sharply. Almost all isobutene in the existing industrial production is obtained from refinery gas and cracked C4 fraction. Among them, the content of isobutene in the refinery gas is generally 5% to 12%, while that in the 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 using propylene and isobutane as raw materials t...

Claims

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Application Information

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IPC IPC(8): C07C11/09C07C1/20
CPCY02P30/20Y02P30/40
Inventor 傅兵龚树华张静彭威陈有权
Owner ZHUHAI FEIYANG NOVEL MATERIALS
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