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Method for separating tetrahydrofuran-ethanol-water mixture with mixed extractant

A technology of mixing extraction agent and tetrahydrofuran, which is applied in the preparation of organic compounds, chemical instruments and methods, preparation of hydroxyl compounds, etc., can solve the problems of low separation purity, low product recovery rate, and complicated separation process, and achieve simple process, High purity and improved separation effect

Active Publication Date: 2019-03-01
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above two kinds of separation methods all have problems and deficiencies such as complex separation process, difficult operation, low product recovery rate, and low separation purity.

Method used

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  • Method for separating tetrahydrofuran-ethanol-water mixture with mixed extractant

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036]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 column (T1) is 30, the feeding position of the tetrahydrofuran-ethanol-water mixture is the 16th block, the feeding position of the extractant is 3, and the theoretical plate number of the extractive distillation column (T2) is 25 block, the feed position is the 17th block, the extractant feed position is 3 blocks, the theoretical plate number of the extraction agent recovery tower (T3) is 20, the feed position is the 6th block, and the flow rate of the extractant ethylene glycol is 600kg / h (solvent ratio is 0.6), the mass ratio of dimethyl sulfoxide and ethylene glycol in the mixed extractant is 0.2, the extractant consumption of the extractive distillation column (T1) is the same a...

Embodiment 2

[0038] 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 column (T1) is 50, the feeding position of the tetrahydrofuran-ethanol-water mixture is the 28th block, the feeding position of the extractant is 8, and the theoretical plate number of the extractive distillation column (T2) is 45 block, the feed position is the 35th block, the extraction agent feed position is 6 blocks, the number of theoretical plates of the extraction agent recovery tower (T3) is 30 blocks, the feed position is the 13th block, and the flow rate of the extraction agent ethylene glycol is 4000kg / h (solvent ratio is 4), the mass ratio of dimethyl sulfoxide and ethylene glycol in the mixed extractant is 0.4, the extractant consumption of the extractive distillation t...

Embodiment 3

[0040] 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 column (T1) is 40, the feeding position of the tetrahydrofuran-ethanol-water mixture is the 23rd block, the feeding position of the extractant is 4, and the theoretical plate number of the extractive distillation column (T2) is 30 block, the feed position is the 20th block, the extraction agent feed position is 5 blocks, the number of theoretical plates of the extraction agent recovery tower (T3) is 24, the feed position is the 11th block, and the flow rate of the extraction agent ethylene glycol is 1500kg / h (solvent ratio is 1.5), the mass ratio of dimethyl sulfoxide and ethylene glycol in the mixed extractant is 0.5, the extractant consumption of extractive distillation tower (T1)...

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Abstract

The invention relates to a method for separating a tetrahydrofuran-ethyl alcohol-water mixture by a mixed extraction agent and a device suitable for the method. According to the method, dimethyl sulfoxide and ethylene glycol are mixed into a mixed extraction agent in certain proportion, the tetrahydrofuran-ethyl alcohol-water mixture firstly enters a first extraction rectifying tower for separation, a tetrahydrofuran product is obtained at the tower top, tower bottom materials enter a second extraction rectifying tower for separation, an ethyl alcohol product is extracted from the tower top, a tower bottom extraction agent and water mixture enters an extraction agent recovery tower, water is extracted from the tower top, and the extraction agent is recycled after being extracted from the tower bottom. The method has the advantages that the energy consumption is low, the technology is simple, equipment investment is small, the product purity of the separated tetrahydrofuran and ethyl alcohol is high and the like, and the adopted ethylene glycol and dimethyl sulfoxide mixed extraction agent can break three binary azeotropes in the system simultaneously and is easy to recycle and good in chemical heat stability.

Description

【Technical field】 [0001] The invention belongs to the field of separation and purification in the chemical industry, and in particular relates to a method for separating tetrahydrofuran-ethanol-water mixture with a mixed extractant. 【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, tetrahydrofuran, ethanol and water waste liquid...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D307/08C07C29/84C07C31/04
CPCC07C29/84C07D307/08C07C31/04
Inventor 王英龙赵永滕张霞文桂林朱兆友
Owner QINGDAO UNIV OF SCI & TECH
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