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

Mixed chlorotoluene MVR (mechanical vapor recompression) rectification system and method

A technology of mixed chlorotoluene and rectification system, which is applied in the field of mixed chlorotoluene MVR rectification system, which can solve the problems of no energy-saving improvement measures, high operating costs, and large steam consumption

Pending Publication Date: 2019-01-04
JIANGSU LEKE ENERGY SAVING TECH CO LTD
View PDF5 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the separation and purification of mixed chlorotoluene can be realized above, the heat source in the rectification process is mainly fresh steam, and there are no corresponding energy-saving improvement measures. Therefore, high-purity products need to be obtained at the cost of high energy consumption. The steam consumption in the whole rectification process is large, the energy utilization efficiency is low, and the operation cost is high

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
  • Mixed chlorotoluene MVR (mechanical vapor recompression) rectification system and method
  • Mixed chlorotoluene MVR (mechanical vapor recompression) rectification system and method
  • Mixed chlorotoluene MVR (mechanical vapor recompression) rectification system and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027]

[0028] Conclusion: The feed temperature of the initial column is 70 ℃, the operating pressure of the top of the three towers is 11kPa, the operating pressure of the tower kettle is 20kPa, the compression ratio of the compressor is 3.33, and the purity of 98% o-chlorotoluene (OCT) is obtained from the top of the adjacent tower. ), to the tower kettle to obtain p-chlorotoluene (PCT) with a purity of 92%, and the energy saving rate is 78.7%.

Embodiment 2

[0030]

[0031] Conclusion: The feed temperature of the initial tower is 90℃, the operating pressure of the top of the three towers is 15kPa, the operating pressure of the tower kettle is 29kPa, the compression ratio of the compressor is 5.35, and the ortho-chlorotoluene (OCT) with a purity of 99.88% is obtained from the top of the adjacent tower. ), to the tower kettle to obtain p-chlorotoluene (PCT) with a purity of 93.76%, and the energy saving rate is 66.8%.

Embodiment 3

[0033]

[0034] Conclusion: The feed temperature of the initial column is 99℃, the operating pressure of the top of the third tower is 20kPa, the operating pressure of the tower kettle is 35kPa, the compression ratio of the compressor is 6, and the ortho-chlorotoluene (OCT) with a purity of 99.9% is obtained from the top of the adjacent column. ), to the tower kettle to obtain p-chlorotoluene (PCT) with a purity of 94.13%, and the energy saving rate is 62.7%.

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 belongs to the field of chemical industry and relates to a mixed chlorotoluene MVR (mechanical vapor recompression) rectification system and method. The system herein comprises a primarycolumn, an ortho-column, a para-column, evaporators, a cooler, a gas-liquid separation tank, a vapor compressor, reboilers and the like. The system is characterized in that continuous rectification via the primary column, ortho-column and para-column by means of rectification is carried out; mixed chlorotoluene mother liquor that is preheated is processed via the primary column to obtain crude o-chlorotoluene and p-chlorotoluene; the crude o-chlorotoluene and p-chlorotoluene are fed respectively into the ortho-column and the para-column for continued rectification; o-chlorotoluene with purityof higher than 98% is acquired from the top of the ortho-column; p-chlorotoluene with purity of higher than 92% is acquired from the bottom of the ortho-column; distillates from the three columns aresubjected to heat exchanging with liquid water in respective top evaporators; the liquid water absorbs heat and evaporates into water vapor; the water vapor is separated and purified by the gas-liquid separation tank before the resultant is heated and pressurized in the vapor compressor; the pressurized material enters the reboilers at the bottoms of the three columns to release latent heat to heat part of the bottom distillates. The system and method herein have the advantages of high separation efficiency, low energy consumption, low operation cost and the like.

Description

technical field [0001] The invention relates to a mixed-chlorotoluene MVR rectification system system and method, and belongs to the field of chemical industry. Background technique [0002] Toluene is an important fine chemical raw material. Chlorination under certain conditions can form mixed-chlorotoluene products. Mixed-chlorotoluene is usually composed of three isomers: o-chlorotoluene, m-chlorotoluene and p-chlorotoluene. Separation and purification is a research topic that many researchers have been paying attention to. At present, with the increasing demand for chlorotoluene raw materials in the market, various separation methods have been developed in various industries at home and abroad, including sulfonation method, extraction method, envelope method, adsorption method, molecular sieve method and rectification method, etc. Rectification is widely used in industrial production. The rectification method mainly realizes the separation of the mixed chlorotoluene mi...

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): C07C17/38C07C17/383C07C25/02
CPCC07C17/38C07C17/383C07C25/02Y02P20/10
Inventor 夏君君司泽田彭涛韩东
Owner JIANGSU LEKE ENERGY SAVING TECH CO LTD
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