Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for preparing isobutene by dehydrating tert-butyl alcohol

A technology for tert-butanol and isobutene, applied in the field of isobutene production by dehydration of tert-butanol, can solve the problems of affecting reaction efficiency, insufficient contact, high energy consumption for separation, etc., and achieves the effects of simple equipment connection, improved utilization rate, and simplified process flow

Pending Publication Date: 2020-09-08
TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
View PDF8 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, sulfonic acid resins are generally not resistant to high temperatures, and swell with water, which has a great impact on the use efficiency of the catalyst. This method often increases the cost of production
In the published patent US4155945, a catalyst is used to continuously dehydrate tert-butanol, a conventional dehydrator containing a solid resin catalyst and other catalysts is used, the top part of the tower is condensed and refluxed, and isobutene is recovered from the phase separator, preferably in the gas phase, and the entrainer returns to dehydration zone, the water phase is removed from the process, but the disadvantages of this patented technical solution are that the separation energy consumption is large, the water removed in the dehydration zone contains more tert-butanol, the loss of raw materials is serious, and the contact between the entrainer and the reactant Insufficient and affect the reaction efficiency, the amount of isobutene obtained is less

Method used

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
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for preparing isobutene by dehydrating tert-butyl alcohol
  • Method for preparing isobutene by dehydrating tert-butyl alcohol
  • Method for preparing isobutene by dehydrating tert-butyl alcohol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Use tert-butanol with a mass fraction of 85% as raw material to the reaction extraction tower, the feed temperature is 60°C, and the feed amount is 100kg / h. The material extracted from the top of the reaction extraction tower enters the azeotropic rectification tower, and the The operating pressure is 0.35Mpa, the reflux ratio is 1.5, the number of theoretical plates is 14, and 130g of entrainer is added to the phase separator. See Table 1 for the specific materials and results.

[0025] Table 1

[0026]

Embodiment 2

[0028] Use tert-butanol with a mass fraction of 75% as the raw material to the reaction extraction tower, the feed temperature is 60°C, and the feed rate is 100kg / h. The operating pressure is 0.35Mpa, the reflux ratio is 1.5, the number of theoretical plates is 8, and 130g of entrainer is added to the phase separator. The specific materials and composition of the results are shown in Table 2.

[0029] Table 2

[0030]

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

PUM

No PUM Login to View More

Abstract

The invention provides a method for preparing isobutene through tert-butyl alcohol dehydration. According to the invention, through combined use of an azeotropic rectification tower, a reaction extraction tower and a phase separator, a high-purity gas-phase isobutene product is separated out; and with the method, rectification equipment can be simplified, the structure is simple, energy consumption is low, and recycling of an azeotropic agent is achieved, so that the yield of isobutene and the conversion rate of tert-butyl alcohol are increased.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a method for preparing isobutene by dehydrating tert-butanol. Background technique [0002] Isobutene is an important basic organic chemical raw material. High-purity isobutene is mainly used to prepare various organic chemical raw materials and fine chemicals such as butyl rubber, polyisobutylene and methacrylate. At present, the industrial production of high-purity isobutene mainly includes three processes: adsorption separation, methyl tert-butyl ether (MTBE) cracking, and tert-butanol (TBA) dehydration. The adsorption separation method is a technology to produce isobutene by using the difference in the adsorption capacity of n-butene and isobutene on molecular sieves. This method is used to produce high-purity n-butene and is also used to produce high-purity isobutene, but because the process of this method is complicated, the production economy is not ...

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

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C07C11/09C07C1/24C07C7/04C07C7/10C07C7/00
CPCC07C1/24C07C7/04C07C7/10C07C7/00C07C11/09
Inventor 王红星刘亚男李飞
Owner TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com