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Separation method for acetone and water mixed solvent

A technology of mixed solvent and separation method, which is applied in the field of waste solvent treatment process with high acetone concentration and large processing capacity, to achieve the effects of reducing production and operation costs, reducing steam consumption, good economic benefits and social benefits

Inactive Publication Date: 2019-04-12
天津精分科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problems of the prior art technology, the purpose of the present invention is to provide a new method for the separation of acetone and water mixed solvent

Method used

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  • Separation method for acetone and water mixed solvent

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Embodiment 1

[0032] Apply the above-mentioned process and process device for separating acetone and water mixed solvent, take the mixed solvent of a pharmaceutical enterprise as an example, the mass fraction of the mixed solvent is 84% ​​acetone, 16% water, and the feed rate is 4800Kg / h. The mixed solvent first enters the raw material preheater 1, and then enters the high-pressure tower 2 after heating up to 55°C. The operating pressure is 0.26MPaA, the pressure drop of the whole tower is 0.002MPaA, the tower top temperature is 85°C, and the reflux ratio is 1.8. The high-alcohol acetone gas phase extracted from the top of the high-pressure tower enters the reboiler 8 of the low-pressure tower to condense and then enters the reflux tank 5 of the high-pressure tower. The material composition is 99.5% acetone and 0.5% water. The bottom liquid of the tower is sent to the low-pressure column 7 through the bottom liquid pump 4 of the high-pressure tower. The high-purity acetone gas phase extract...

Embodiment 2

[0035]Apply the above-mentioned technological method and technological device for separating acetone and water mixed solvent, take the mixed solvent of pharmaceutical enterprise as an example, the mass fraction of mixed solvent is 60% acetone, 40% water respectively, and the feed rate is 9600Kg / h. The mixed solvent first enters the raw material preheater 1, and then enters the high pressure tower 2 after heating up to 53°C. The operating pressure is 0.3MPaA, the pressure drop of the whole tower is 0.002MPaA, the tower top temperature is 91°C, and the reflux ratio is 1.9. The high-purity acetone gas phase extracted from the top of the high-pressure tower enters the reboiler 8 of the low-pressure tower to condense and then enters the reflux tank 5 of the high-pressure tower. The material composition is 99.6% acetone and 0.4% water. The bottom liquid of the tower is sent to the low-pressure column 7 through the bottom liquid pump 4 of the high-pressure tower. The high-purity acet...

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Abstract

The invention provides a separation method for an acetone and water mixed solvent. The separation method includes the following steps that the mixed solvent firstly enters a raw material preheated, has heat exchange with extraction wastewater of a low-pressure tower kettle, and then enters a high-pressure tower. An acetone product gas phase is extracted from the top of the high-pressure tower andenters a low-pressure tower reboiler for providing a heat source for a low-pressure tower, and after heat exchange, an acetone product is extracted. High-pressure tower kettle liquor enters the low-pressure tower, the acetone product is extracted from the top of the low-pressure tower, and the wastewater is extracted from the bottom of the tower. Compared with an existing technology, the separation method substantially lowers energy consumption, saves the cost for production and operation, and has the advantages that the recovery rate of the acetone product is high, and purity is high.

Description

technical field [0001] The invention belongs to the technical field of solvent recovery, and in particular relates to a process for separating acetone and water mixed solvents in chemical industry, medicine, fiber and other industries, and is especially suitable for the treatment process of waste solvents with high acetone concentration and large processing capacity. Acetone and water are separated by a two-tower differential pressure thermal coupling rectification method to obtain high-purity acetone and reduce the difficulty of wastewater treatment. Background technique [0002] Acetone is a representative compound of aliphatic ketones, an important raw material for organic synthesis, and an organic solvent widely used in pharmaceutical, chemical, fiber and other industries. So acetone recovery has great economic significance and can reduce the impact on the environment. Since the solvent directly or indirectly participates in the production process during the production ...

Claims

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Application Information

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IPC IPC(8): C07C45/82C07C49/08
CPCC07C45/82C07C49/08
Inventor 王海红吴杨
Owner 天津精分科技发展有限公司
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