Low-concentration DMF wastewater treatment system by distillation method with multiple intermediate heat exchangers

An intermediate heat exchanger, low-concentration technology, applied in the direction of heating water/sewage treatment, water/sewage treatment, chemical instruments and methods, etc., can solve the problems of low thermodynamic efficiency and energy waste

Inactive Publication Date: 2017-05-31
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The top of the tower is directly cooled by condensed water, and the bottom of the tower is heated by high-grade steam, which causes a lot of energy waste and low thermodynamic efficiency

Method used

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  • Low-concentration DMF wastewater treatment system by distillation method with multiple intermediate heat exchangers
  • Low-concentration DMF wastewater treatment system by distillation method with multiple intermediate heat exchangers
  • Low-concentration DMF wastewater treatment system by distillation method with multiple intermediate heat exchangers

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Experimental program
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Effect test

Embodiment 1

[0028] Attached image 3 Shown technological process, contain DMF 10% (massfraction) in the raw material mixture A, H 2 O90% (mass fraction), feed rate is 5000kg / h, enters preheater 1 preheating under normal temperature and pressure, enters separation in rectifying tower 2 by 102 after reaching bubble point temperature. The DMF wastewater separation and rectification tower needs 42 theoretical plates, the operating pressure is 0.1 MPa, the packing used is corrugated packing with perforated plates, the tower diameter is 1.15 meters, and the reflux ratio is 0.44. The concentration of the water at the top of the tower reaches 99.8%, and the DMF product with a purity of 99.8% is obtained in the tower still. Extract 90% of the tray material total amount from 37 plates, that is, the mixture of 7705.1kg / h is extracted through the 401 pipeline, and the temperature of the material is 102.4 ° C. Through the intermediate heat exchanger 4 (heated with 0.17MPa steam), the consumption of 3...

Embodiment 2

[0031] Attached image 3 Shown technological process, contain DMF 20% (massfraction) in raw material mixture A, H 2O 80% (mass fraction), feed rate is 5000kg / h, enters preheater 1 preheating under normal temperature and pressure, enters separation in rectifying column 2 by S102 after reaching bubble point temperature. The DMF wastewater separation and rectification tower needs 28 theoretical plates, the operating pressure is 101.3kPa, the packing used is corrugated packing with perforated plates, the tower diameter is 1.1 meters, and the reflux ratio is 0.51. The concentration of the water at the top of the tower reaches 99.8%, and the DMF product with a purity of 99.8% is obtained in the tower still. Extract 30% of the tray material total amount from 21 plates, that is, the mixture of 3692.6kg / h is extracted through the 401 pipeline, the temperature of the material is 101.7°C, and through the intermediate heat exchanger 4 (heated with 0.17MPa steam), the consumption of 1638....

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Abstract

The invention relates to a low-concentration DMF wastewater treatment system by a distillation method with multiple intermediate heat exchangers. The system comprises a raw material preheater, a normal-pressure rectification tower, a plurality of intermediate reboilers, an overhead condenser and a tower kettle reboiler, wherein DMF wastewater is preheated to a bubble point in the preheater and is separated in the rectification tower. According to the system, consumption of high-grade steam can be reduced by adopting the plurality of intermediate reboilers, and the material extracted from the side line of an intermediate plate is heated by steam having a relatively low energy grade, so that the consumption of steam at the tower bottom can be saved, and the thermodynamic efficiency of a separation system can be improved. Compared with a traditional rectification method, the system has the advantage that the thermodynamic efficiency can be increased by over 39 percent.

Description

technical field [0001] The invention belongs to the field of waste water treatment, and relates to a method for separating low-concentration DMF waste water, in particular to a system with multiple intermediate heat exchangers for treating low-concentration DMF waste water. Background technique [0002] N,N-Dimethylformamide (DMF) is a low-toxic, colorless, transparent liquid, used as a A chemical raw material with excellent performance, strong polarity, miscible with water, ether, alcohol, ester, unsaturated hydrocarbon and aromatic hydrocarbon, known as "universal solvent". DMF is widely used in chemical production, resulting in the discharge of a large amount of DMF wastewater. Long-term exposure or inhalation by the human body will hinder hematopoietic function and cause liver disorders, and cause serious pollution to the atmosphere and water. Therefore, the treatment of DMF wastewater is particularly important. [0003] The concentration of DMF in the waste liquid dis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/04C07C231/24C07C233/05
CPCC02F1/04C02F1/043C02F2101/38C07C231/24C07C233/05
Inventor 高晓新朱碧云黄泽恩马江权杨德明
Owner CHANGZHOU UNIV
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