Unlock instant, AI-driven research and patent intelligence for your innovation.

Novel method for rectifying and separating acetone and isopropyl ether systems under variable pressures

A technology of pressure swing rectification and isopropyl ether, which is applied in the separation/purification of ether, separation/purification of carbonyl compounds, preparation of ether, etc. It can solve the problems of large amount of extractant, complex process, high energy consumption, etc., and achieve the reduction of separation cost, solving separation difficulties, and improving the effect of product purity

Active Publication Date: 2017-02-22
QINGDAO UNIV OF SCI & TECH
View PDF9 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Chinese patent CN104478712A discloses a method for extracting and rectifying separation of methyl acetate and methanol, using 1-hexyl-3-methylimidazole chloride and 1-ethyl-3-methylimidazole bromide as extractants, through two One-step extractive distillation is used for separation, but this method carries out two-step extractive distillation, and the process is complex and difficult to operate
[0008] Chinese patent CN102795957A discloses a method for extracting and rectifying the separation of m-methylethylbenzene and p-methylethylbenzene, using nitrogen-containing compounds as extractants, but the extraction agent has low separation efficiency for m-methylethylbenzene and p-methylethylbenzene, and the amount of extractant used is large , high energy consumption
[0009] Chinese patent CN104119202A discloses a method for separating methanol and acetone by pressure swing rectification, which forms an energy-saving mechanism based on heat integration technology, but the equipment is cumbersome and troublesome to operate
[0010] Chinese patent CN105111046A discloses a new process for extracting and rectifying the separation of isopropanol and isopropyl ether azeotropic mixture, using the emerging ionic liquid [emim] + [BF 4 ] - 、[bmim] + [BF 4 ] - It is an extraction agent, but the extraction agent used in this process is expensive, which is not conducive to large-scale industrial application
The invention proposes a novel pressure swing rectification method, which solves the problem of difficult separation of non-pressure-sensitive acetone and isopropyl ether. The process is simple and the operation is reasonable, and high-purity acetone and isopropyl ether products can be obtained, saving Cost while ensuring product quality

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
  • Novel method for rectifying and separating acetone and isopropyl ether systems under variable pressures

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Feed flow rate is 1000kg / h, temperature is 30°C, pressure is 6atm (absolute pressure), mass composition: acetone 60%, isopropyl ether 40%. The number of theoretical plates in the high pressure column (HT) is 40, and the material is fed to the 20th plate. The recycle stream is fed to the 11th plate of the high pressure column (HT). ℃. The low pressure column (LT) has 20 theoretical plates, feeds in the twelfth block, the reflux ratio is 1, the temperature at the top of the tower is 15°C, and the temperature at the bottom of the tower is 55°C.

[0051] After separation: the acetone product quality purity reaches 99.8%; the isopropyl ether product quality purity reaches 99.82%; the yield of acetone reaches 99.89%; the yield of isopropyl ether reaches 99.85%.

Embodiment 2

[0053] Feed flow rate is 1000kg / h, temperature is 30°C, pressure is 1atm (absolute pressure), mass composition: acetone 70%, isopropyl ether 30%. The number of theoretical plates in the high-pressure tower (HT) is 40, and the feed is at the 28th plate. The recycle stream is fed at the 13th plate of the high-pressure tower (HT). The reflux ratio is 1.5. ℃. The low-pressure column (LT) has 20 theoretical plates, feeds to the 8th block, the reflux ratio is 1.5, the temperature at the top of the tower is 20°C, and the temperature at the bottom of the tower is 50°C.

[0054] After separation: the acetone product quality purity reaches 99.99%; the isopropyl ether product quality purity reaches 99.99%; the yield of acetone reaches 99.9%; the yield of isopropyl ether reaches 99.92%.

Embodiment 3

[0056] Feed flow rate is 1000kg / h, temperature is 30°C, pressure is 1atm (absolute pressure), mass composition: acetone 85%, isopropyl ether 15%. The theoretical plate number of the high pressure column (HT) is 40, and the feed is at the 26th plate, and the recycle stream is fed at the 10th plate of the high pressure column (HT), the reflux ratio is 2.5, the temperature at the top of the tower is 110°C, and the temperature at the bottom of the tower is 130°C ℃. The low-pressure column (LT) has 20 theoretical plates, feeds at the tenth block, the reflux ratio is 1, the temperature at the top of the tower is 25°C, and the temperature at the bottom of the tower is 60°C.

[0057] After separation: the acetone product quality purity reaches 99.92%; the isopropyl ether product quality purity reaches 99.9%; the yield of acetone reaches 99.8%; the yield of isopropyl ether reaches 99.82%.

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 novel method for rectifying and separating acetone and isopropyl ether systems under variable pressures. An added third substance is used as an entrainer. The characteristic that azeotropic composition of azeotrope formed by acetone and isopropyl ether cannot vary along with variation of the pressures but azeotropic composition of azeotrope formed by methyl acetate and the acetone can greatly vary along with variation of the pressures when the methyl acetate is used as the entrainer is utilized, the acetone and isopropyl ether azeotrope systems are separated in newly formed rectifying zones by the aid of high-pressure rectifying towers and low-pressure rectifying towers sequentially, and newly added third components can be recycled in processes in replenishing modes. The method has the advantages that the cost can be saved, and the quality of products can be guaranteed; the processes are simple, and devices are reasonable; high-purity methanol and tetrahydrofuran products can be simultaneously obtained.

Description

[0001] 【Technical field】 [0002] The invention belongs to the field of separation and purification of chemical industry, and relates to the separation of acetone and isopropyl ether azeotrope system, in particular to a novel pressure swing rectification method for separating acetone and isopropyl ether system by adding methyl acetate as an entrainer . [0003] 【Background technique】 [0004] Acetone is mainly used as a solvent in industries such as explosives, plastics, rubber, fiber, leather, grease, spray paint, etc. It can also be used as a solvent for the synthesis of enone, acetic anhydride, iodoform, polyisoprene rubber, methacrylic acid, etc. An important raw material for methyl ester, chloroform, epoxy resin and other substances. Isopropyl ether is a good solvent for animal, vegetable and mineral oils, and a good solvent for paraffin wax and resins. In industry, isopropyl ether and other solvents are often mixed and used in the dewaxing process of paraffin-based oils....

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): C07C45/84C07C49/08C07C41/42C07C43/04
CPCC07C41/42C07C45/84C07C49/08C07C43/04
Inventor 蓝佳晖朱兆友王永坤赵永滕王英龙
Owner QINGDAO UNIV OF SCI & TECH
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

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

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com