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

An isobutene, high-purity technology, applied in the direction of chemical change purification/separation, sustainable manufacturing/processing, organic chemistry, etc., can solve the problems of limited conversion rate, low equipment investment, and low single-pass conversion rate of tert-butanol dehydration reaction , to achieve the effect of improving conversion rate and selectivity, simplifying process flow, and facilitating separation and purification
CN102633588AInactive Publication Date: 2012-08-15BEIJING UNIV OF CHEM TECH
4 Cites 10 Cited by

Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
BEIJING UNIV OF CHEM TECH
Publication Date
2012-08-15
Estimated Expiration
Not applicable · inactive patent

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

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.
Need to check novelty before this filing date? Find Prior Art

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More