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
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  • 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. Th...

Method used

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  • 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

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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%.

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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

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Application Information

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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
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