Method for preparing isobutylene from tert-butanol

A technology of tert-butanol and isobutene, which is applied in the field of isobutene preparation, can solve the problems of increasing equipment and operating costs, and achieve the effects of reducing the generation of by-product polymers and carbooctaether, high conversion rate and selectivity, and high purity

Active Publication Date: 2015-04-01
BEIJING ENZE FULAI TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method solves the problem of by-product carbon 8 enrichment very well, but uses two sets of equipment, which increases equipment and operating costs

Method used

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  • Method for preparing isobutylene from tert-butanol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] First fill the θ ring packing with 25 theoretical plates and a diameter of Ф3 below the catalyst section in the catalytic distillation tower; then fill the θ ring packing with 12 theoretical plates and a diameter of Ф3 above the catalyst section; then divide the catalyst section into 5 sections And load 15g catalyzer respectively; Back then, the tert-butanol aqueous solution that is 5% by mass content is passed into the catalytic distillation tower with flow velocity 0.15kg / h, meanwhile, deionized water enters catalytic distillation tower from tower top with flow velocity 0.12kg / h The distillation tower is heated and distilled at an operating pressure of 0.2Mpa and a tower bottom temperature of 130°C.

[0041] Among them, in Example 1 of the present invention, the temperature of the lower layer of the catalyst is 98°C, the temperature of the upper layer of the catalyst is 31°C, the conversion rate of tert-butanol is 98.50%, the selectivity is 99.93%, and the isobutene co...

Embodiment 2

[0043] First fill the θ ring packing with a theoretical plate number of 40 and a diameter of Ф3 below the catalyst section in the catalytic distillation tower; then fill the θ ring packing with a theoretical plate number of 25 and a diameter of Ф3 above the catalyst section; then divide the catalyst section into 8 sections And load 30g catalyst respectively; Immediately after that, 45% tert-butanol aqueous solution is passed into the catalytic distillation tower with a flow rate of 0.85kg / h. The tower is heated and distilled at an operating pressure of 0.1Mpa and a bottom temperature of 100°C.

[0044] Among them, in Example 1 of the present invention, the temperature of the lower layer of the catalyst is 80°C, the temperature of the upper layer of the catalyst is 73°C, the conversion rate of tert-butanol is 99.21%, the selectivity is 99.98%, and the isobutene content in the tower gas is 99.35%.

Embodiment 3

[0046] First fill the θ ring packing with 35 theoretical plates and a diameter of Ф3 below the catalyst section in the catalytic distillation tower; then fill the θ ring packing with a theoretical plate number of 20 and a diameter of Ф3 above the catalyst section; then divide the catalyst section into 7 sections And load 25g catalyzer respectively; Immediately after that, the tert-butanol aqueous solution with a mass content of 15% is passed into the catalytic distillation tower with a flow rate of 0.65kg / h. The tower is heated and distilled at an operating pressure of 0.3Mpa and a tower bottom temperature of 180°C.

[0047] Among them, in Example 1 of the present invention, the temperature of the lower layer of the catalyst is 110°C, the temperature of the upper layer of the catalyst is 36°C, the conversion rate of tert-butanol is 99.58%, the selectivity is 99.96%, and the isobutene content in the tower gas is 99.99%.

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Abstract

The invention relates to a method for preparing high-purity isobutylene from a low-concentration tert-butanol aqueous solution. The method comprises the following steps: (1) firstly respectively filling catalyst sections arranged in the middle of a catalytic distillation tower with theta-ring packing; and sectioning the catalyst and filling each catalyst section with the catalyst; (2) introducing the tert-butanol aqueous solution and deionized water into the catalytic distillation tower; carrying out heating distillation on the tert-butanol aqueous solution by virtue of a tower bottom reboiler to form a tert-butanol-water azeotrope, dehydrating tert-butanol in the tert-butanol-water azeotrope by virtue of a catalyst layer to generate isobutylene, enabling unreacted tert-butanol to be absorbed by virtue of deionized water to reach the catalyst layer and further dehydrating to generate isobutylene; and (3) producing high-purity isobutene at the top and ionized water at the tower bottom. The method has the advantages of simplicity in operation flow, low cost and high conversion rate and selectivity and the produced isobutylene is high in purity and the preparation efficiency is high.

Description

technical field [0001] The invention relates to the technical field of isobutene preparation, in particular to a method for preparing high-purity isobutene from a low-concentration tert-butanol aqueous solution. Background technique [0002] Isobutylene is an important basic organic chemical raw material, especially the research and development of important chemical raw materials such as butyl rubber, polyisobutylene, and methacrylonitrile, which has led to an increasing demand for high-purity isobutylene as the main raw material. [0003] In industry, isobutene is generally mixed with other isomeric butenes in the form of mixed carbon four or raffinated carbon four. Wherein, since the boiling point difference between isobutene and n-butene is very small, it is not economical to separate isobutene from C4 by conventional distillation methods. Generally, C4 is directly burned as fuel, resulting in a waste of resources. [0004] One of the existing main methods for producing ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C1/24C07C11/09
CPCY02P20/10
Inventor 姚志龙叶丽莉张胜红周明孙培永毛进池
Owner BEIJING ENZE FULAI TECH
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