Supercharge Your Innovation With Domain-Expert AI Agents!

Method for separating acetonitrile-methanol-benzene three-element azeotrope by heat-integration tri-tower variable-voltage rectification

A technology of benzene ternary azeotrope and pressure swing rectification, which is applied in distillation purification/separation, chemical instruments and methods, hydrocarbon purification/separation, etc., to improve product purity, reduce rectification processing capacity, and reduce energy consumption Effect

Active Publication Date: 2017-05-31
QINGDAO UNIV OF SCI & TECH
View PDF6 Cites 9 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method only realizes heat integration between single towers

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 acetonitrile-methanol-benzene three-element azeotrope by heat-integration tri-tower variable-voltage rectification
  • Method for separating acetonitrile-methanol-benzene three-element azeotrope by heat-integration tri-tower variable-voltage rectification
  • Method for separating acetonitrile-methanol-benzene three-element azeotrope by heat-integration tri-tower variable-voltage rectification

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Feed flow rate 1000kg / h, temperature 25°C, mass composition: 20% acetonitrile, 70% methanol, 10% benzene. The number of effective theoretical plates of column T1 is 48, the raw material liquid is introduced from the 39th plate, the circulating feeding position is the 16th plate, the operating pressure is 6atm, the reflux ratio is 2.38, and the tower diameter is about 710mm; the effective theoretical plate of column T2 The total number is 54. The production liquid at the top of tower T1 is introduced from the 14th plate. The operating pressure is 1 atm, the reflux ratio is 2.57, and the tower diameter is about 670mm. The outlet liquid is introduced by the third plate, the operating pressure is 6atm, the reflux ratio is 0.2, and the tower diameter is about 370mm. After separation and treatment, the product purity of acetonitrile was 0.9995, the product purity of methanol was 0.9995, and the product purity of benzene was 0.9995. The recovery rate of acetonitrile was 99.80%...

Embodiment 2

[0046] Feed flow rate 1500kg / h, temperature 25°C, mass composition: 20% acetonitrile, 70% methanol, 10% benzene. The number of effective theoretical plates of column T1 is 54, the raw material liquid is introduced from the 39th plate, the circulating feed position is the 25th plate, the operating pressure is 6atm, the reflux ratio is 2.30, and the column diameter is about 820mm; the effective theoretical plate of column T2 The total number is 57. The production liquid at the top of tower T1 is introduced from the 15th plate. The operating pressure is 1 atm, the reflux ratio is 2.94, and the tower diameter is about 820 mm. The effective theoretical plate number of tower T3 is 15. The outlet liquid is introduced by the fourth plate, the operating pressure is 6atm, the reflux ratio is 0.3, and the tower diameter is about 440mm. After separation and treatment, the product purity of acetonitrile was 0.9995, the product purity of methanol was 0.9995, and the product purity of benzen...

Embodiment 3

[0052] Feed flow rate 500kg / h, temperature 30°C, mass composition: 20% acetonitrile, 70% methanol, 10% benzene. The number of effective theoretical plates in column T1 is 46, the raw material liquid is introduced from the 36th plate, the circulating feeding position is the 18th plate, the operating pressure is 6atm, the reflux ratio is 1.2, and the column diameter is about 470mm; the effective theoretical plate of column T2 is The total number is 50. The production fluid at the top of tower T1 is introduced from the 16th plate. The operating pressure is 1 atm, the reflux ratio is 1.95, and the tower diameter is about 490 mm. The outlet liquid is introduced by the fourth plate, the operating pressure is 6atm, the reflux ratio is 0.18, and the tower diameter is about 200mm. After separation and treatment, the product purity of acetonitrile was 0.9995, the product purity of methanol was 0.9995, and the product purity of benzene was 0.9995. The recovery rate of acetonitrile was 99...

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 an acetonitrile-methanol-benzene three-element azeotrope by heat-integration tri-tower variable-voltage rectification. The device mainly comprises an acetonitrile tower T1, a methanol column T2, a benzene tower T3, a return tank D1, a return tank D2, a return tank D3, an auxiliary condenser C1, a condenser C2, a reboiler H1, a heat exchanger H2, a heat exchanger H3 and a reboiler H4. The high-pressure tower / atmospheric tower / high-pressure tower tri-tower variable-voltage rectification mode is adopted to break through the bottle neck that the multielement azeotrope can be efficiently separated easily due to the existence of the rectification boundary; and while the acetonitrile, methanol and benzene products are separated, the partial heat-integration mode is adopted to implement heat integration among the three towers, thereby greatly lowering the energy consumption and achieving the goals of energy saving and efficiency enhancement.

Description

[0001] 【Technical field】 [0002] The invention belongs to the field of separation and purification of chemical industry, especially the separation of multiple azeotropic mixtures, and specifically relates to a method for separating acetonitrile-methanol-benzene ternary azeotrope by heat-integrated three-tower pressure-swing rectification, especially suitable for separating composition changes with Acetonitrile-methanol-benzene ternary azeotropic system with strong pressure sensitivity and large pressure changes. [0003] 【Background technique】 [0004] Methanol (CH 3 OH), acetonitrile (CH 3 CN) and benzene (C 6 h 6 ) are important organic chemical products. When a certain cephalosporin drug is produced in a certain industry, a mixture of acetonitrile, methanol and benzene will be produced. Due to the binary azeotrope between acetonitrile, methanol and benzene between the ternary system, the mixture of Separation fails to meet corporate purity requirements. Therefore, spe...

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): C07C255/03C07C253/34C07C31/04C07C29/76C07C29/80C07C15/04C07C7/00C07C7/04
CPCC07C7/005C07C29/76C07C29/80C07C253/34C07C255/03C07C31/04C07C15/04Y02P20/10
Inventor 朱兆友王伟徐东芳耿雪丽王英龙
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