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Quadruple-effect method for rectifying and recycling waste water containing DMF (dimethyl formamide)

A recovery method and waste water technology, applied in organic chemistry, carboxylic acid amide separation/purification, etc., can solve problems such as difficult operation of the system, difficulty in controlling the quality of finished products, and inability to fully utilize heat, so as to save energy and reduce consumption Effect

Inactive Publication Date: 2013-10-02
张瑞烟
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a four-effect rectification recovery method containing DMF wastewater to solve the shortcomings of the existing DMF four-effect process that some heat cannot be fully utilized, the system is difficult to operate, and the quality of the finished product is difficult to control.

Method used

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  • Quadruple-effect method for rectifying and recycling waste water containing DMF (dimethyl formamide)
  • Quadruple-effect method for rectifying and recycling waste water containing DMF (dimethyl formamide)

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Embodiment Construction

[0019] Such as figure 1 Shown, the present invention contains DMF waste water four-effect rectification recovery method and comprises: after the waste water containing DMF is preheated by waste water preheater, pass through one-level vacuum rectification tower successively (tower pressure is 9-12Kpa, and tower bottom temperature is 54-56℃ ), two-stage vacuum rectification tower (the top pressure is 23-27Kpa, the bottom temperature is 68-69℃), three-stage vacuum distillation tower (the top pressure is 44-49Kpa, the bottom temperature is 85- 89°C), the atmospheric rectification tower (100-103°C) and the deacidification tower are discharged, and the overhead steam of the second-stage vacuum rectification tower is preheated by the reboiler for the material of the first-stage vacuum rectification tower. The top steam of the three-stage vacuum rectification tower is preheated by the reboiler for the material of the two-stage vacuum rectification tower, and the top steam of the atmos...

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Abstract

The invention discloses a quadruple-effect method for rectifying and recycling waste water containing DMF. The method comprises the steps as follows: utilization of heat of a deamination tower, a first-grade decompression rectifying tower discharging major cycle technology, normal-pressure rectifying tower gas-phase discharge to a deacidification tower and improvements and innovations on techniques such as up and down backflow of the deacidification tower and the like. According to the method, heat inside a system is fully used, the circulation volume of refrigerant recycled water is reduced, the consumption of a primary heat source is saved, the operation and running of the whole system is more stable and simpler, and the quality of a DMF finished product is easier to control. The technological process improvement method can be applied to a triple-effect DMF recycling system as well.

Description

Technical field [0001] The present invention involves a solvent recovery method, which is specifically involved in a method of separation and purification of DMF -containing four -effect refined removal recovery methods. Background technique [0002] DMF, also known as n, n-di metamimamamide, is an important organic solvent and excellent solvent. It is used in the pharmaceutical industry to create antibiotics, hormones and other drugs, and the chemical fiber industry is used for gatheringAcrylic spinning, pesticide industry is used to create high -efficiency, low toxic pesticide pesticides, petrochemical industry as a gas absorption agent and acetylene solvent. The organic industry is used as a raw material for synthetic organic compounds.Solvent, gas color spectrum fixation solution, separation analysis of C2-C3 hydrocarbon, orthopedic-1 and cinellion-2 used for separation analysis, and at the same time, a large amount of manufacturing, dyes, insulation materials for synthetic l...

Claims

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Application Information

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IPC IPC(8): C07C233/03C07C231/24
Inventor 张瑞烟梁沛文黄金艳倪丽霞赵立肖王宏达岳志超
Owner 张瑞烟
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