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

Method for separating n-hexane and acetone by liquid-liquid extraction-flash evaporation of ionic liquid

An ionic liquid, n-hexane technology, applied in extraction purification/separation, chemical instruments and methods, hydrocarbon purification/separation, etc., can solve the problem of high energy consumption, achieve high purity, easy recycling, and reduce separation costs.

Pending Publication Date: 2021-01-15
青岛三瑞节能环保技术有限公司
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The article "Simulation Optimization of Extractive Distillation of Acetone and n-Hexane Azeotropic System" discloses a double-tower continuous extractive distillation process using N-methylpyrrolidone as an extractant for acetone and n-hexane azeotropic system. The number of theoretical plates in the distillation tower is 32, the content of n-hexane in the top product of the extraction distillation tower reaches 99.84%, and the content of acetone in the top product of the extraction agent recovery tower reaches 99.88%, but this method consumes a lot of energy

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 separating n-hexane and acetone by liquid-liquid extraction-flash evaporation of ionic liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The feed flow rate is 140kg / h, the feed contains 52% acetone and 48% n-hexane (mass fraction), the number of theoretical plates in the liquid-liquid extraction tower (LET) is 5, and the mixture of acetone and n-hexane is extracted from the liquid-liquid extraction tower ( LET), the extractant enters from the top of the liquid-liquid extraction tower (LET), the extractant is 1-hexyl-3-methylimidazolium bis(trifluoromethanesulfonyl) salt ionic liquid, the flow rate is 280kg / h ( The feed flow mass ratio of the extractant to the acetone-n-hexane mixture was 2), and the temperature of the liquid-liquid extraction tower (LET) was 25°C. The operating pressure of the flash tank (F1) is 0.015 atm, the operating pressure of the flash tank (F2) is 0.01, the purity of acetone after separation is 99.95%, the yield is 99.95%, the purity of n-hexane is 99.95%, the yield 99.95%.

Embodiment 2

[0031] The feed flow rate is 140kg / h, and the feed contains 55% acetone and 45% (mass fraction) of n-hexane. The number of theoretical plates in the liquid-liquid extraction tower (LET) is 10. The mixture of acetone and n-hexane enters from the bottom of the liquid-liquid extraction tower (LET), and the extractant enters from the top of the liquid-liquid extraction tower (LET). The extraction agent is 1- Butyl-3-methylimidazolium trifluoromethanesulfonate ionic liquid, the flow rate is 70kg / h (the feed flow mass ratio of extractant to acetone-n-hexane mixture is 0.5), the liquid-liquid extraction tower (LET) The temperature is 35°C. The operating pressure of the flash tank (F1) is 0.01atm, the operating pressure of the flash tank (F2) is 0.02, the purity of acetone after separation is 99.97%, the yield is 99.97%, the purity of n-hexane is 99.97%, the yield 99.97%.

Embodiment 3

[0033] The feed flow rate is 140kg / h, and the feed contains 54% acetone and 46% (mass fraction) of n-hexane. The number of theoretical plates in the liquid-liquid extraction tower (LET) is 8. The mixture of acetone and n-hexane enters from the bottom of the liquid-liquid extraction tower (LET), and the extractant enters from the top of the liquid-liquid extraction tower (LET). The extraction agent is 1- Hexyl-3-methylimidazolium trifluoromethanesulfonate ionic liquid, the flow rate is 140kg / h (the feed flow mass ratio of extractant to acetone-n-hexane mixture is 1), and the temperature of the liquid-liquid extraction tower (LET) is 28°C. The operating pressure of the flash tank (F1) is 0.02atm, the operating pressure of the flash tank (F2) is 0.015, the purity of acetone after separation is 99.96%, the yield is 99.96%, the purity of n-hexane is 99.96%, the yield It is 99.96%.

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 relates to a method for separating a mixture of n-hexane and acetone by liquid-liquid extraction-flash evaporation of ionic liquid and a device suitable for the method. According to themethod, imidazole ionic liquid is used as an extraction agent, n-hexane and acetone firstly enter a liquid-liquid extraction tower to be extracted and separated, materials at the upper part of the liquid-liquid extraction tower enter a flash tank to be separated, high-purity n-hexane is obtained at the top of the flash tank, and materials at the lower part of the liquid-liquid extraction tower enter another flash tank to be separated; high-purity acetone is obtained at the tops of the flash tanks, and the extracting agent is recycled after being extracted from the bottoms of the two flash tanks. The method has the advantages of low energy consumption, simple process, high purity of n-hexane and acetone after separation and the like, the adopted extracting agent imidazolium salt ionic liquid is hardly volatilized, the loss of the extracting agent is reduced, and the method is easy to recover, good in chemical thermal stability, green and pollution-free.

Description

technical field [0001] The invention belongs to the field of chemical separation and purification, and specifically relates to a method for ionic liquid liquid-liquid extraction-flash separation of a mixture of n-hexane and acetone. Furthermore, it relates to an extraction tower using an imidazolium salt ionic liquid as an extraction agent. Then adopt the flash tank liquid-liquid extraction-flash method for separating n-hexane and acetone. Background technique [0002] Acetone, n-hexane, and benzene series are widely used in printing, painting, furniture manufacturing and other industries, and are common chemical substances in daily life. Acetone is an organic compound with a boiling point of 56.5°C. It is usually used in industries such as explosives, plastics, rubber, fiber, leather, oil, and spray paint. It can also be used to synthesize ketene, acetic anhydride, iodoform, and polyisoprene. It is an important raw material for vinyl rubber, methyl methacrylate, chloroform...

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): C07C9/15C07C7/10C07C7/00C07C49/08C07C45/80C07C45/81
CPCC07C7/10C07C7/00C07C7/005C07C45/80C07C45/81C07C9/15C07C49/08
Inventor 朱兆友白文婷刘兴振朱峰
Owner 青岛三瑞节能环保技术有限公司
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