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Device and method for treating DMF (Dimethyl Formamide) wastewater by using triple-effect heat pump rectification method

A technology for heat pump rectification and waste water, applied in heating water/sewage treatment, heat recovery system, energy-saving heating/cooling, etc., can solve the problem of high energy consumption in DMF rectification, achieve significant economic benefits, save investment costs, and save energy consumption effect

Pending Publication Date: 2022-08-09
QUZHOU RES INST OF ZHEJIANG UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem of high energy consumption in DMF rectification recovery, the present invention provides a device and method for treating DMF wastewater by three-effect heat pump rectification

Method used

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  • Device and method for treating DMF (Dimethyl Formamide) wastewater by using triple-effect heat pump rectification method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] 1) DMF wastewater enters the distillation tower (1-1) after preheating (4-1).

[0047] 2) The temperature of the distillation tower (1-1) is 100 ° C, the pressure is 0.1MPa, and the tower is 0.5. The steaming tower (1-1) The steam at the top of the tower passes through the steam compressor (1-2) and then enters the distilled tower and the boiling device (2-3) to heat it. Part of the DMF concentrated wastewater obtained by the distillation tower (1-1) tower bottom is sent to the distillation tower (2-1) through the pump (1-4) of the pump (1-4), and part of the distilled tower re-boiling device (1- 3) Return to the distillation tower after heating (1-1).

[0048] 3) The temperature of the distillation tower (2-1) is 100 ° C, the pressure is 0.1MPa, and the tower is 0.5. The steaming tower (2-1) The steam of the tower is heated by the steam compressor (2-2) after heating the temperature of 15 ° C (3-3) to heate the heating. Part of the DMF concentrated wastewater obtained by t...

Embodiment 2

[0051] 1) DMF wastewater enters the distillation tower (1-1) after preheating (4-1).

[0052] 2) The temperature of the distillation tower (1-1) is 115 ° C, the pressure is 0.13MPa, and the tower is 0.5. The steaming tower (1-1) The steam at the top of the tower passes through the steam compressor (1-2) and then enters the distilled tower and the boiling device (2-3) to heat it. Part of the DMF concentrated wastewater obtained by the distillation tower (1-1) tower bottom is sent to the distillation tower (2-1) through the pump (1-4) of the pump (1-4), and part of the distilled tower re-boiling device (1- 3) Return to the distillation tower after heating (1-1).

[0053] 3) The temperature of the distillation tower (2-1) is 115 ° C, the pressure is 0.13MPa, and the tower is 0.5. The steaming tower (2-1) The steam of the tower is heated by the steam compressor (2-2) and then enters the funeral tower and then heated. Part of the DMF concentrated wastewater obtained by the distillation...

Embodiment 3

[0056] 1) DMF wastewater enters the distillation tower (1-1) after preheating (4-1).

[0057] 2) The temperature of the distillation tower (1-1) is 100 ° C, the pressure is 0.1MPa, and the tower is backward ratio 3. The steaming tower (1-1) The steam at the top of the tower passes through the steam compressor (1-2) and then enters the distilled tower and the boiling device (2-3) to heat it. Part of the DMF concentrated wastewater obtained by the distillation tower (1-1) tower bottom is sent to the distillation tower (2-1) through the pump (1-4) of the pump (1-4), and part of the distilled tower re-boiling device (1- 3) Return to the distillation tower after heating (1-1).

[0058] 3) The temperature of the distillation tower (2-1) is 100 ° C, the pressure is 0.1MPa, and the tower is backward ratio 3. The steaming tower (2-1) The steam of the tower is heated by the steam compressor (2-2) after heating the temperature of 15 ° C (3-3) to heate the heating. Part of the DMF concentrate...

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Abstract

The invention relates to a device and a method for treating DMF (Dimethyl Formamide) wastewater by a triple-effect heat pump rectification method. The device comprises a first-stage micro-positive-pressure rectification system, a second-stage micro-positive-pressure rectification system, a third-stage low-pressure rectification system and a raw material preheating system, wherein the first-stage micro-positive-pressure rectification system, the second-stage micro-positive-pressure rectification system and the third-stage low-pressure rectification system are sequentially connected in series. According to the invention, DMF in wastewater is recovered by connecting three rectifying towers in series, and the energy of steam at the tops of the rectifying towers is recovered by the heat pump, so that the energy-saving effect is fully exerted. Compared with a traditional process for treating DMF wastewater through three-tower rectification, the method has the advantages that the energy consumption can be reduced by 10-20%, and remarkable economic benefits are achieved.

Description

Technical field [0001] The present invention is the field of chemical waste solvent treatment recycling, and it involves a device and method for the processing of DMF wastewater for a three -effect heat pump. Background technique [0002] DMF full name N ,, N -Diantianamide is a commonly used organic solvent and chemical raw materials. It can be completely dissolved with a variety of substances such as water, ether, alcohol. Essence In the field of PU Legal system, DMF is used in large quantities of solvents for PU resin. Because DMFs are only used as solvents in the synthetic leather production without participating in chemical reactions, most of the DMFs will enter production wastewater after the production process is over, generating a large amount of DMF wastewater. [0003] The price of DMF is relatively expensive, and it is toxic. It can enter the human body through the skin and respiratory tract, causing damage to the human liver, kidney and other organs. If the direct dis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/04C07C231/24C07C233/03
CPCC02F1/04C07C231/24C07C233/03Y02B30/52
Inventor 李伟聪沈剑吴可君何宇晨
Owner QUZHOU RES INST OF ZHEJIANG UNIV