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Separation method for mixed solution of propionaldehyde and acetone

A separation method, the technology of propionaldehyde and acetone, which is applied in the field of separation to achieve the effects of high separation efficiency, simple process flow and increased relative volatility

Active Publication Date: 2018-12-21
YANKUANG ENERGY R&D CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent CN1379751A discloses a method for refining acetone. In this method, an alkaline reagent and an oxidizing agent are added to the mixture to convert propionaldehyde impurities with close boiling points into high-boiling point components, which helps to remove trace aldehyde impurities and realize the purification of acetone. Purpose, this method is suitable for the removal of trace aldehyde impurities in crude acetone to obtain refined acetone, and is not suitable for separating both propionaldehyde and acetone as products

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  • Separation method for mixed solution of propionaldehyde and acetone

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Effect test

Embodiment 1

[0022] A mixture of propionaldehyde and acetone with a propionaldehyde content of 10 wt % is used as a raw material, and ethylene glycol is used as an extractant. The operating conditions of the extractive distillation column T1 are: the number of theoretical plates is 30, the raw material and the extractant are respectively fed to the 14th block and the second block from the top, the reflux ratio is 1, the solvent ratio is 2, and the top pressure of the tower is 30kPa. The temperature at the top is 25.4°C, and the temperature at the bottom of the tower is 120.1°C. The operating conditions of the solvent recovery tower T2 are: 6 theoretical plates, 3 plates at the feed position, and 2 reflux ratios. The pressure at the top of the tower was 20 kPa, the temperature at the top of the tower was 9.4°C, and the temperature at the bottom of the tower was 160.2°C. According to the above conditions, acetone with a purity of 99.43 wt% is obtained from the top of the extractive distilla...

Embodiment 2

[0024] A mixture of propionaldehyde and acetone with a mass content of propionaldehyde of 10 wt % is used as a raw material, and glycerol is used as an extractant. The operating conditions of the extractive distillation column T1 are: the number of theoretical plates is 30, the raw material and the extractant are respectively fed to the 14th and 1st blocks from the top, the reflux ratio is 1, the solvent ratio is 2, and the top pressure of the tower is 30kPa. The temperature at the top was 25.4°C, and the temperature at the bottom of the column was 109.8°C. The operating conditions of the solvent recovery tower T2 are: 6 theoretical plates, 3 plates at the feed position, 1 reflux ratio, 20kPa top pressure, 9.4°C top temperature, and 176.1°C bottom temperature. According to the above conditions, acetone with a purity of 99.56 wt% is obtained from the top of the extractive distillation tower, and propionaldehyde with a purity of 99.99 wt% is obtained from the top of the solvent ...

Embodiment 3

[0026] A mixture of propionaldehyde and acetone with a propionaldehyde content of 10 wt% is used as a raw material, and a mixed solution of ethylene glycol and glycerol with a volume ratio of 1:1 is used as an extractant. The operating conditions of the extractive distillation column T1 are: the number of theoretical plates is 30, the raw material and the extractant are respectively fed to the 14th block and the second block from the top, the reflux ratio is 1, the solvent ratio is 1, and the top pressure of the tower is 30kPa. The temperature at the top was 25.4°C, and the temperature at the bottom of the column was 113.4°C. The operating conditions of the solvent recovery tower T2 are: 6 theoretical plates, 3 plates at the feeding position, and 1 reflux ratio. The pressure at the top of the tower was 20kPa, the temperature at the top of the tower was 9.4°C, and the temperature at the bottom of the tower was 171.5°C. According to the above conditions, acetone with a purity o...

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Abstract

The invention relates to a separation method for a mixed solution of propionaldehyde and acetone. The separation method is characterized in that the relative volatility between components by adoptinga solvent and the propionaldehyde is separated from the acetone by using an extracting distillation technology; a mixed solution of the propionaldehyde and the acetone enters the middle of an extractive distillation column and interacts with an extraction agent entering from the upper part of the column, and thus the acetone is obtained from the column top and a mixed solution of the propionaldehyde and the extraction agent is obtained from the column bottom; the mixed solution of the propionaldehyde and the extraction agent, extracted from the bottom of the extractive distillation column enters the middle of a solvent recovery column, and thus the propionaldehyde is obtained from the column top and the extraction agent is extracted from the column bottom; a regenerated extraction agent ispumped back to the top of the extractive column for cycle use. Compared with the prior art, the separation method disclosed by the invention solves the separation problem of the mixed solution of thepropionaldehyde and the acetone having close boiling points and physical properties; the separation method has the advantages of high separation efficiency, low energy consumption, simple technologyand the like.

Description

technical field [0001] The invention relates to a separation method, in particular to a separation method of propionaldehyde-acetone mixed liquid. Background technique [0002] Propionaldehyde is an important raw material for organic synthesis. It is a colorless transparent liquid, flammable and has a suffocating smell. It is soluble in water and miscible with alcohol and ether. Propionaldehyde is mainly used to produce chemical intermediates such as propionic acid, propanol, trimethylolethane and acetone oxime, and has a wide range of uses in industries such as rubber, paint, plastics, medicine, spices, agriculture, textiles and feed. [0003] Acetone is a colorless liquid with a special smell. It is an important organic solvent or extractant. It is mainly used as a dewaxing solvent for the manufacture of cellulose acetate films, plastics and coatings, and petroleum refining. It can also be used as a dewaxing solvent for various microorganisms. Extractant with hormones. A...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C45/83C07C47/02C07C49/08
CPCC07C45/83C07C47/02C07C49/08
Inventor 孙启文杨正伟张宗森周小江刘继森
Owner YANKUANG ENERGY R&D CO LTD
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