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Method for complete thermal coupling extractive distillation separation of tetrahydrofuran-ethanol-water mixture

An extractive distillation and tetrahydrofuran technology, which is applied in the field of complete thermal coupling extractive distillation and separation of tetrahydrofuran-ethanol-water mixture, can solve the problems of low separation purity, low product recovery rate, complicated separation process, etc. The effect of energy consumption and convenient operation

Pending Publication Date: 2019-04-26
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Both of the above two separation methods have problems such as complicated separation process, difficult operation, low product recovery rate and low separation purity.

Method used

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  • Method for complete thermal coupling extractive distillation separation of tetrahydrofuran-ethanol-water mixture

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The feed temperature is 30° C., the flow rate is 1000 kg / h, and the pressure is 1 atm absolute pressure. The feed contains 10% (mass fraction) of tetrahydrofuran, 20% (mass fraction) of ethanol, and 70% (mass fraction) of water. The number of theoretical plates in the extractive distillation main tower (T1) is 70, the feeding position of the tetrahydrofuran-ethanol-water mixture is the 30th block, and the extractant feeding position is the 4th block, which enters the extractive distillation sub-column (T2) The gas is drawn from the 50th block of the extractive distillation main tower (T1), and the mass ratio of the gas stream entering the extractive distillation sub-column (T2) to the feed is 1, and the theoretical plate number of the extractive distillation sub-column (T2) is 25 , the extraction agent feed position is the third block, the gas entering the extraction agent recovery sub-tower (T3) is drawn from the 65th block of the extractive distillation main tower (T1)...

Embodiment 2

[0039]The feed temperature is 30° C., the flow rate is 1000 kg / h, and the pressure is 1 atm absolute pressure. The feed contains 30% (mass fraction) of tetrahydrofuran, 30% (mass fraction) of ethanol, and 40% (mass fraction) of water. The number of theoretical plates in the extractive distillation main tower (T1) is 90, the feeding position of the tetrahydrofuran-ethanol-water mixture is the 50th block, and the extractant feeding position is the 7th block, which enters the extractive distillation sub-tower (T2) The gas is drawn from the 70th block of the extractive distillation main tower (T1), and the mass ratio of the gas stream entering the extractive distillation sub-column (T2) to the feed is 1.6, and the theoretical plate number of the extractive distillation sub-column (T2) is 45 , the extraction agent feed position is the 6th block, the gas entering the extraction agent recovery sub-tower (T3) is drawn from the 80th block of the extractive distillation main tower (T1), ...

Embodiment 3

[0043] The feed temperature is 30° C., the flow rate is 1000 kg / h, and the pressure is 1 atm absolute pressure. The feed contains 50% (mass fraction) of tetrahydrofuran, 20% (mass fraction) of ethanol, and 30% (mass fraction) of water. The number of theoretical plates in the extractive distillation main tower (T1) is 80, the feeding position of the tetrahydrofuran-ethanol-water mixture is the 40th block, and the extractant feeding position is the 5th block, which enters the extractive distillation sub-column (T2) The gas is drawn from the 60th block of the extractive distillation main tower (T1), and the mass ratio of the gas stream entering the extractive distillation sub-column (T2) to the feed is 1.4, and the theoretical plate number of the extractive distillation sub-column (T2) is 35 , the extraction agent feeding position is the 4th block, the gas entering the extraction agent recovery sub-tower (T3) is drawn from the 73rd block of the extractive distillation main tower (...

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Abstract

The invention relates to a method for complete thermal coupling extractive distillation separation of a tetrahydrofuran-ethanol-water mixture and a device suitable for the method. The method is characterized in that two extractive distillation columns for separating the tetrahydrofuran-ethanol-water mixture and one extraction agent recovery tower are completely coupled; one part of gas is led fromthe lower-middle part of a main extractive distillation column and enters a secondary extractive distillation column; one part of gas is led from the lower part of the main extractive distillation column and enters a secondary extraction agent recovery tower; a tetrahydrofuran product is obtained from the top of the main extractive distillation column; an ethanol product is obtained from the topof the secondary extractive distillation column; high-purity water is obtained from the top of the secondary extraction agent recovery tower; a recovered extracting agent obtained from the bottom of the main extractive distillation column enters the upper part of the main extractive distillation column and the upper part of the secondary extractive distillation column for recycling. The method hasthe advantages of low energy consumption and simple process; heat coupling and integration of three towers are realized, and equipment expenses are reduced while energy consumption is reduced.

Description

【Technical field】 [0001] The invention belongs to the field of separation and purification in the chemical industry, and specifically relates to a method for completely thermally coupled extraction and rectification to separate tetrahydrofuran-ethanol-water mixture. 【Background technique】 [0002] Tetrahydrofuran is an important raw material for organic synthesis and a solvent with excellent performance. It is especially suitable for dissolving PVC, polyvinylidene chloride and butylaniline. It is widely used as a solvent for surface coatings, anti-corrosion coatings, printing inks, tapes and film coatings. In terms of organic synthesis, it is used to produce tetrahydrothiophene, 1,2-dichloroethane, 2,3-dichlorotetrahydrofuran, valerolactone, butyrolactone and pyrrolidone, etc. In the pharmaceutical industry, tetrahydrofuran can be used to synthesize Kebiqing, Rifamycin, progesterone and some hormone drugs. In the process of producing the drug 18-norethindrone, tetrahydrofur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D307/08C07C29/84C07C31/08B01D3/40
CPCB01D3/40C07C29/84C07D307/08C07C31/08
Inventor 王英龙滑端成杨萧朱兆友崔培哲
Owner QINGDAO UNIV OF SCI & TECH