Four-effect rectification system for synthesizing leather dimethyl formamide solution by wet method and recovery method

A technology of dimethylformamide and synthetic leather, applied in the field of separation and purification of dimethylformamide, to achieve great economic and social benefits, improve the level, and improve the effect of heat utilization

Inactive Publication Date: 2010-05-12
TIANJIN UNIV
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Problems solved by technology

However, there is no four-effect DMF recovery device in China. The four-effect DMF recovery process can f

Method used

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  • Four-effect rectification system for synthesizing leather dimethyl formamide solution by wet method and recovery method
  • Four-effect rectification system for synthesizing leather dimethyl formamide solution by wet method and recovery method
  • Four-effect rectification system for synthesizing leather dimethyl formamide solution by wet method and recovery method

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Embodiment Construction

[0016] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0017] Three-effect DMF recovery process comparison example:

[0018] Fig. 1 shows the schematic diagram of traditional three-effect DMF recovery process, with the process of processing 12 tons per hour of DMF containing 18% (mass fraction) as an example, it includes feeding, preheating, decompression through two stages The concentration tower, the first-stage atmospheric distillation tower and the first-stage deacidification tower are concentrated, separated, and discharged to form a recovery process flow; it uses heat-conducting oil or low-pressure steam as the heat medium, and adopts the first-stage decompression concentration and the second-stage decompression Pressure concentration, atmospheric distillation, vacuum deacidification process. The above-mentioned recycling process adopts a recycling process, and the heat energy generated is recycled between the towe...

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Abstract

The invention relates to a four-effect rectification system for synthesizing a leather dimethyl formamide solution by a wet method, and a recovery method. The four-effect rectification system comprises decompressing concentration towers, a normal-pressure rectification tower and a decompressing deacidification tower, wherein one decompressing concentration tower is added between two decompressing concentration towers in a three-effect rectification recovery system; the normal-pressure rectification tower adopts a filler tower. The process comprises the steps of feeding and preheating. By the concentration towers, the processes of one-stage decompressing concentration, two-stage decompressing concentration, three-stage decompressing concentration, normal-pressure rectification and decompressing deacidification are adopted, wherein the one-stage decompressing concentration tower, the two-stage decompressing concentration tower, the three-stage decompressing concentration tower, the normal-pressure rectification tower and the decompressing deacidification tower all adopt filler towers. The recovery technological procedure adopts a circulation process, and the generated heat energy is circularly used between the procedures of steaming at a tower top, heating by a tower kettle, feeding, preheating, condensing a finished product, preheating, rectifying and boiling again. Compared with a three-effect DMF recovery process which is widely applied at present, energy is at least saved by more than 20%; the purity of a recovered finished product DMF reaches 99.99%, the water content is below 200ppm, the acidity is below 20ppm, and the alkalinity is below 10ppm.

Description

technical field [0001] The invention relates to a solvent recovery method, in particular to a wet synthetic leather dimethylformamide solution four-effect rectification system and a recovery method, belonging to the field of separation and purification of dimethylformamide. Background technique [0002] N,N-Dimethylformamide, commonly known as DMF, is an important organic chemical raw material, pesticide, pharmaceutical intermediate, and an excellent solvent and absorbent for various gases. It is widely used in organic synthesis, petroleum, artificial leather and other industries. . In the process of wet synthetic leather, DMF is used as an organic solvent. Since DMF does not undergo chemical reactions as a solvent, there is almost no loss in quantity, and a large amount of waste water containing DMF is correspondingly produced, causing extremely serious pollution to the environment. How to economically and effectively recover the DMF and treat the accompanying wastewater i...

Claims

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Application Information

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IPC IPC(8): B01D3/14C07C233/03C07C231/24
Inventor 张吕鸿史志强罗铭芳张志恒李楠楠肖红
Owner TIANJIN UNIV
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