Method for preparing high-purity isobutene from raffinate C4 by means of separation

A technology for raffinating C4 and isobutene is applied in the field of preparation of isobutene, and can solve the problems of low single-pass conversion rate, limited conversion rate, low equipment investment, etc. The effect of selective, simplified process flow

Inactive Publication Date: 2015-01-28
BEIJING UNIV OF CHEM TECH
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Problems solved by technology

This method has simple flow, mild process conditions, less side reactions, easy separation and purification, high product quality, low equipment investment, and its disadvantage is that the single pass conversion rate of tert-butanol dehydration reaction is low
Although the strong acidic cation exchange resin catalyst used has high selectivity, the chemical equilibrium limit of hydration reaction and dehydration reaction is still not broken, so its conversion rate is limited

Method used

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  • Method for preparing high-purity isobutene from raffinate C4 by means of separation
  • Method for preparing high-purity isobutene from raffinate C4 by means of separation
  • Method for preparing high-purity isobutene from raffinate C4 by means of separation

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Experimental program
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Effect test

Embodiment 1

[0033] High-purity isobutene is prepared by separating and preparing high-purity isobutene from the by-product C4 fraction of the refinery fluidized catalytic cracking (FCC) unit after extracting butadiene, and the mass percentage content of isobutene in the raffinate C4 is 25.52%. The operating conditions and results are shown in Table 1, and the mass fraction of the product isobutene reaches 99.93%.

Embodiment 2

[0035] High-purity isobutene is prepared by separating and preparing high-purity isobutene from the by-product C4 fraction of the refinery fluidized catalytic cracking (FCC) unit after extracting butadiene, and the mass percentage content of isobutene in the raffinate C4 is 25.52%. The operating conditions and results are shown in Table 2, and the mass fraction of the product isobutene reaches 99.99%.

Embodiment 3

[0037] High-purity isobutene is separated and prepared by using the by-product C4 fraction of the steam cracking ethylene plant after extracting butadiene as raw material, and the mass percentage content of isobutene in the raffinate C4 is 46.67%. The operating conditions and results are shown in Table 3, and the mass fraction of the product isobutene reaches 99.92%.

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Abstract

A method for preparing high-purity isobutene from raffinate C4 by means of separation belongs to the technical field of isobutene preparation, and includes the steps: by combining a fixed bed reactor with a catalysis rectifying column and utilizing macro-porous sulfoacid cation exchange resin as catalyst, mixing C4 with water, then sequentially carrying out hydration reaction in a hydration reactor and a hydration rectifying column to generate tert-butyl alcohol, refining tert-butyl alcohol aqueous solution by a tert-butyl alcohol separating column, and sequentially carrying out dehydration reaction in a dehydration reactor and a dehydration catalysis rectifying column to generate the isobutene. The method adopting the catalysis rectifying technology breaks through chemical equilibrium limitations, conversion rate of the isobutene in the hydration reaction and the tert-butyl alcohol in the dehydration reaction is increased, selectivity of the isobutene in the hydration reaction and the tert-butyl alcohol in the dehydration reaction is enhanced, process is simplified, equipment investment cost is lowered, the catalysis reaction and a rectifying process are coupled, energy consumption during production is reduced, and operating cost is lowered.

Description

technical field [0001] The invention relates to a method for separating and preparing high-purity isobutene from raffinate C4, belonging to the technical field of isobutene preparation. Background technique [0002] Isobutene is an important basic organic chemical raw material with a wide range of industrial uses, especially high-purity isobutene, which is mainly used to produce polyisobutylene, butyl rubber, isoprene rubber and methacrylate and other organic chemical raw materials and fine chemicals. In recent years, with the development of my country's petrochemical industry and the development of isobutene downstream products, the demand for high-purity isobutene has gradually increased. [0003] Isobutene mainly comes from the by-product C4 fraction of the refinery fluidized catalytic cracking (FCC) unit and the by-product C4 fraction of naphtha and light oil steam cracking ethylene unit. The composition of mixed carbon four varies with the change of refinery raw mater...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C11/09C07C7/148
CPCY02P20/10
Inventor 雷志刚邹志武代成娜陈标华
Owner BEIJING UNIV OF CHEM TECH
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