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Method for separating n-butyric acid and water through liquid-liquid extraction-heterogeneous azeotropy

An azeotropic distillation column and n-butyric acid technology, which is applied in the field of liquid-liquid extraction-heterogeneous azeotropic distillation to separate water and n-butyric acid mixture, can solve the problems of waste of resources, high energy consumption, and low separation efficiency , to achieve the effect of less investment in equipment, low energy consumption and easy recycling

Pending Publication Date: 2021-07-23
QINGDAO UNIV OF SCI & TECH
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Problems solved by technology

[0006] At present, there are few patent reports on the separation of n-butyric acid-water, and the existing separation technologies for separating acetic acid-water mixtures have problems such as waste of resources, low separation efficiency, and high energy consumption.
There are few literature reports on the technology of separating n-butyric acid-water

Method used

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  • Method for separating n-butyric acid and water through liquid-liquid extraction-heterogeneous azeotropy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Feed flow is 5000kg / h, and the massfraction of n-butyric acid in the feed is 30%, water is 70%, the mass flow of mixed solvent isopropyl butyrate, isopropyl acetate is 7300kg / h, liquid-liquid extraction tower ( LEC) theoretical plate number is 10, and the mixture of n-butyric acid and water enters from the bottom of the liquid-liquid extraction column (LEC), and the mixed solvent enters from the top of the liquid-liquid extraction column (LEC), isopropyl butyrate, acetic acid The feed ratio of isopropyl ester was 7:3, and the temperature of the liquid-liquid extraction column (LEC) was 40 °C. The operating pressure of the azeotropic distillation column C1 is 0.3 atm, and the operating pressure of the azeotropic distillation column C2 is 1 atm. After separation, the purity of n-butyric acid is 99.9%, and the purity of water is 99.99%.

Embodiment 2

[0026] The feed flow rate is 5000kg / h, the feed contains 3.3% phenol, the mass fraction of n-butyric acid in the feed is 40%, water is 60%, and the mass flow rate of the mixed solvent isopropyl butyrate and isopropyl acetate is 5000kg / h, the number of theoretical plates in the liquid-liquid extraction column (LEC) is 20, the mixture of n-butyric acid and water enters from the bottom of the liquid-liquid extraction column (LEC), and the mixed solvent enters from the top of the liquid-liquid extraction column (LEC) , the feed ratio of isopropyl butyrate and isopropyl acetate is 7:3, and the temperature of the liquid-liquid extraction column (LEC) is 40°C. The operating pressure of the azeotropic rectification tower C1 is 0.3 atm, and the operating pressure of the azeotropic rectification tower C2 is 1 atm. After separation, the purity of n-butyric acid is 99.9%, and the purity of water is 99.9%.

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Abstract

The invention relates to a method for separating n-butyric acid and water through liquid-liquid extraction-heterogeneous azeotropy and a process suitable for the method. The method comprises the following steps: pre-separating n-butyric acid and water by adopting a liquid-liquid extraction tower, separating a material at the upper part of the liquid-liquid extraction tower in an azeotropic rectifying tower to obtain high-purity n-butyric acid at the bottom, separating a material at the lower part of the liquid-liquid extraction tower in another azeotropic rectifying tower to obtain high-purity water at the bottom of the rectifying tower, and recycling the mixed solvent after the mixed solvent is extracted from the top of the two azeotropic rectifying towers. The method has the advantages of low energy consumption, simple process, high purity of n-butyric acid and water after separation and the like, and the adopted mixed solvent is good in separation effect, almost free of loss and easy to recover.

Description

【Technical field】 [0001] The invention belongs to the field of chemical separation and purification, and specifically relates to a liquid-liquid extraction-heterogeneous azeotropic distillation method for separating a mixture of water and n-butyric acid. Specifically, a mixed solvent of isopropyl butyrate and isopropyl acetate is first used. A liquid-liquid extraction tower is used to pre-separate and then a distillation tower is used to further separate and purify n-butyric acid and water. 【Background technique】 [0002] With the rapid development of industry, the pollution of water bodies by industrial wastewater is becoming more and more extensive and serious, threatening human health and safety. Therefore, in order to protect the environment, the treatment of industrial wastewater is more important than the treatment of urban sewage. Butyric acid is an important fine chemical raw material, mainly used to manufacture cellulose butyrate and synthesize butyrate ester. The...

Claims

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Application Information

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IPC IPC(8): C07C51/42C07C53/124
CPCC07C51/42C07C53/124
Inventor 齐建光姚东孟凡庆李鑫王英龙
Owner QINGDAO UNIV OF SCI & TECH
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