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Method for separating acetone and methyl alcohol by extractive distillation of ionic liquid

An ionic liquid and extractive distillation technology, applied in the field of extractive distillation, can solve the problems of low product purity, corrosion, high cost, etc., and achieve good separation ability, reduced usage, and good stability

Active Publication Date: 2017-12-08
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Patent CN106431836A provides a process for coupling extraction, rectification and flash distillation to separate ethanol-water system. Although the separation of the mixture is achieved, the purity of the product is not high
[0006] Patent CN101492345B provides a method for extracting and rectifying separation of acetone and methanol by adding salt. Although this method effectively separates the mixture of acetone and methanol, it does not recycle the added salt, and the added salt such as sodium acetate is strong Alkali and weak salts have a corrosive effect on the tower, and it is difficult to transport solids and block pipes, etc.
[0007] Patent CN104387231A provides a two-step extraction and rectification separation device and method for acetone-methanol. Although two ionic liquids are used as extraction agents to separate acetone and methanol, only acetone with a mass fraction of about 95% is obtained. The purity is low, and more ionic liquids are used, and the cost is high

Method used

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  • Method for separating acetone and methyl alcohol by extractive distillation of ionic liquid

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Experimental program
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Effect test

Embodiment 1

[0031] The feed temperature is 25° C., the flow rate is 100 kg / h, the feed contains 35% methanol, 65% acetone, and the fresh ionic liquid extractant flow rate is 0.01 kg / h. The number of theoretical plates in the extractive distillation column (T1) is 26, the feed plate of the fresh stream is 17, the feed plate of the circulating stream is 2, the operating pressure is 1 atm, the inner diameter of the tower is 0.456m, the reflux ratio is 2.1, and the temperature at the top of the tower is controlled at 55.75~56.5℃; the operating pressure of the flash tank (F) is 0.02bar, and the gas phase fraction is 0.43; One theoretical plate enters the stripping tower, and the air enters the stripping tower from the sixth theoretical plate, the operating pressure is 0.02bar, and the inner diameter of the tower is 0.345m. The mass fraction of the product acetone obtained after separation is 99.99%, and the mass yield is 99.99%, and the mass fraction of product methanol is 99.98%, and the mass...

Embodiment 2

[0033] The feed temperature is 25° C., the flow rate is 100 kg / h, the feed contains 25% methanol, 75% acetone, and the fresh ionic liquid extractant flow rate is 0.01 kg / h. The number of theoretical plates in the extractive distillation column (T1) is 30, the feed plate of the fresh stream is 25, the feed plate of the circulating stream is 2, the operating pressure is 1 atm, the inner diameter of the tower is 0.460m, the reflux ratio is 2, and the temperature at the top of the tower is controlled at 55.75~56.5℃; the operating pressure of the flash tank (F) is 0.02bar, and the gas phase fraction is 0.48; One theoretical plate enters the stripping tower, and the air enters the stripping tower from the eighth theoretical plate, the operating pressure is 0.02bar, and the inner diameter of the tower is 0.345m. The mass fraction of the product acetone obtained after separation is 99.99%, and the mass yield is 99.98%, and the mass fraction of product methanol is 99.96%, and the mass ...

Embodiment 3

[0035]The feed temperature is 25° C., the flow rate is 100 kg / h, the feed contains 45% methanol, 55% acetone, and the fresh ionic liquid extractant flow rate is 0.01 kg / h. The number of theoretical plates in the extractive distillation column (T1) is 22, the feed plate of the fresh stream is 15, the feed plate of the recycle stream is 2, the operating pressure is 1 atm, the inner diameter of the tower is 0.419m, the reflux ratio is 2.3, and the temperature at the top of the tower is controlled at 55.75~56.5°C; the operating pressure of the flash tank (F) is 0.05 bar, and the gas phase fraction is 0.59; One theoretical plate enters the stripping tower, and the air enters the stripping tower from the sixth theoretical plate, the operating pressure is 0.02bar, and the inner diameter of the tower is 0.345m. The mass fraction of the product acetone obtained after separation is 99.99%, and the mass yield is 99.99%, and the mass fraction of product methanol is 99.98%, and the mass yi...

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Abstract

The invention relates to a method for separating acetone and methyl alcohol by extractive distillation of ionic liquid. Acetone and methyl alcohol can form binary azeotrope which is difficult to separate by a conventional method. According to the method, acetone and methyl alcohol azeotrope is separated by using 1-ethyl-3-methylimidazolium dicyanamide ionic liquid as an extracting agent in an extractive distillation mode with a normal-pressure extractive distillation tower, a flash tank and a stripping tower only, along with simple process, low equipment cost, little extracting agent dosage and high product purity. The method adopts the ionic liquid with high boiling point, low steaming pressure, proper viscosity, low evaporation rate and easy recycling as the extracting agent, the composition of binary azeotrope of acetone and methyl alcohol can be broken through, and the method can be used for recycling acetone and methyl alcohol in industrial application.

Description

【Technical field】 [0001] The invention relates to the technical field of extractive distillation, in particular to a method for separating acetone-methanol binary azeotrope by using ionic liquid extractive distillation. 【Background technique】 [0002] Acetone (acetone), also known as dimethyl ketone, is a colorless liquid with a special pungent smell. It has excellent solubility and is an excellent organic solvent and an important chemical raw material. As a solvent, it can be widely used in explosives, plastics, rubber, fiber, leather, oil, paint and other industries. As a basic chemical raw material, it is used to synthesize ketene, acetic anhydride, iodoform, polyisoprene rubber, methyl methacrylate, chloroform, epoxy resin and other substances. [0003] Methanol (Methano), also known as wood alcohol or wood essence, is a colorless liquid with excellent solubility. It is a basic chemical raw material and is used to manufacture methyl formate, acetic acid, chloromethane, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C49/08C07C45/83C07C31/04C07C29/84
CPCC07C29/84C07C45/83C07C49/08C07C31/04
Inventor 朱兆友耿雪丽郑奉斌宗雨轩王英龙
Owner QINGDAO UNIV OF SCI & TECH
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