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DMF (dimethyl formamide) wastewater treatment device and method

A waste water treatment and waste water technology, which is applied in natural water body treatment, heating water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of large space occupation, poor energy saving effect, high equipment cost, etc., and achieve a reduction in land occupation area, reduce tower equipment, and reduce the effect of equipment investment

Active Publication Date: 2015-06-03
HANGZHOU ZJU HOLLEY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] One of the purposes of the present invention is to provide a DMF wastewater treatment device and method. The DMF recovered by the present invention has stable quality and high recovery rate, and at the same time overcomes the problems of poor energy saving effect, large space occupation and high equipment cost of the above-mentioned technology.

Method used

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  • DMF (dimethyl formamide) wastewater treatment device and method
  • DMF (dimethyl formamide) wastewater treatment device and method

Examples

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Embodiment 1

[0032]Dividing Wall Column (DWC for short) is a vertical wall installed in the rectification column, and the vertical wall can also be extended to the top or bottom of the column. The two parts of the DWC column separated by the dividing wall can have a common Rectification section or stripping section, or both common rectification section and stripping section. The DWC tower is a thermodynamically ideal system structure. When separating the three-component mixture, the same number of theoretical plates is used to complete the same separation task. The DWC tower requires less reboiling heat and condensation than the traditional two-tower process. quantity. For some given materials, the reflux ratio of the dividing wall distillation column is smaller than that of the conventional distillation column, so the operating capacity is increased, the energy saving can reach more than 60%, and the equipment investment may be saved by 30%. DWC tower can be widely used in petroleum refi...

Embodiment 2

[0048] figure 2 Shown is a schematic structural diagram of the DMF wastewater treatment device in Example 2 of the present invention.

[0049] Such as figure 2 Shown, a kind of DMF wastewater treatment device provided by the present invention comprises waste water preheater 1, vacuum distillation tower 2, steam compressor 3, vacuum distillation tower reboiler 4, vacuum distillation tower reflux Pump 5, intermediate vaporizer 6, water removal tower 17, DMF rectification tower 20, intermediate steam compressor 8, water removal tower reboiler 18, water removal tower condensate return pump 19, DMF compressor 11, DMF rectification tower reboiler 21 and DMF delivery pump 13;

[0050] The waste water preheater 1 is connected to the vacuum rectification tower 2, and the top of the vacuum rectification tower 2 is connected to the water vapor compressor 3, and the water vapor compressor 3 is connected to the vacuum rectification tower 2 through the vacuum rectification tower reboile...

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Abstract

The invention provides a DMF (dimethyl formamide) wastewater treatment device and method. The device comprises a wastewater preheater, a reduced pressure rectifying column, a water vapor compressor, a reduced pressure rectifying column reboiler, a reduced pressure rectifying column reflux pump, an intermediate carburetor, a divided wall rectifying column, an intermediate vapor compressor, an intermediate reboiler, an intermediate condensate reflux pump, a DMF compressor, a divided wall rectifying column reboiler and a DMF conveying pump. According to the method, a rectifying system formed by the common reduced pressure rectifying column and the divided wall rectifying column is adopted to rectify DMF wastewater of synthetic leather to refine and recover DMF, meanwhile, effective energy-saving measures such as heat pump rectification and the like are used, a very good energy-saving effect is realized, and the product quality is high.

Description

technical field [0001] The invention belongs to the field of wastewater treatment, and in particular relates to a DMF wastewater treatment device and method. Background technique [0002] Polyurethane (PU) synthetic leather was produced in the late 1970s and developed in the 1990s. It is an important part of the plastics industry and is widely used in various industries of the national economy. Its application fields pervade people's daily life. all aspects. The production of synthetic leather generally uses polyurethane as the basic raw material of the base layer and the surface layer, and is prepared by solution polymerization through N, N-dimethylamide (DMF) as the main solvent. The amount of solvent accounts for more than 60% of the resin amount. , the amount of wet slurry DMF reaches more than 70%. DMF is biologically toxic. Long-term exposure or inhalation by the human body will hinder hematopoietic function and cause liver disorders. At the same time, DMF is difficu...

Claims

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Application Information

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IPC IPC(8): C02F1/04C02F103/38
Inventor 吴嘉林龙勇鲍艳胡晓萍
Owner HANGZHOU ZJU HOLLEY TECH
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