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System for removing formic acid generated during dimethylformamide recovering process

A technology of dimethylformamide and formic acid, which is applied in the field of formic acid system, can solve the problems of DMF that affects the recovery, the content of formic acid exceeds the standard, and formic acid cannot be completely decomposed.

Active Publication Date: 2014-07-02
WUXI DOUBLE ELEPHANT MICRO FIBER MATERIAL
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  • Abstract
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AI Technical Summary

Problems solved by technology

However, due to actual operation errors in the actual production process, the formic acid produced often cannot be completely decomposed, and the remaining formic acid accumulates to a certain extent, which will affect the recovered DMF, and the formic acid content seriously exceeds the standard

Method used

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  • System for removing formic acid generated during dimethylformamide recovering process

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Embodiment Construction

[0012] The present invention will be further described below in conjunction with specific drawings.

[0013] As shown in the figure: the system for removing formic acid produced in the recovery process of dimethylformamide includes recovery pot 1, DMF concentrated liquid inlet 2, first gas outlet 3, lye inlet 4, liquid waste residue outlet 5, alkali distribution tank 6 , alkali pump 7, dryer 8, liquid waste residue inlet 9, dry residue outlet 10, water vapor outlet 11, water vapor separator 12, second gas outlet 13, liquid outlet 14, residue condenser 15, condensate tank 16, vacuum pump 17. Heat transfer oil cooler 18, first heat transfer oil inlet 19, first heat transfer oil outlet 20, cooling water inlet 21, cooling water outlet 22, third heat transfer oil inlet 23, third heat transfer oil outlet 24, heat transfer oil cooling pump 25. The second heat transfer oil inlet 26, the second heat transfer oil outlet 27, etc.

[0014] The present invention comprises recovery boiler ...

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Abstract

The invention relates to a system for removing formic acid produced in the recovery process of dimethylformamide, comprising a recovery pot, characterized in that: the recovery pot is provided with a DMF concentrated liquid inlet, a first gas outlet, an alkali liquor inlet and liquid waste residue The outlet and lye inlet are connected to the alkali distribution tank through pipelines, the liquid waste slag outlet is connected to the liquid waste slag inlet of the dryer, the dry slag outlet and the water vapor outlet are provided on the dryer, the water vapor outlet is connected to the water vapor separator, and the water vapor separator is equipped with The second gas outlet and the liquid outlet, the liquid outlet is connected to the DMF concentrated liquid inlet of the recovery pot through the pipeline, the second gas outlet is connected to the inlet of the residue condenser through the pipeline, and the outlet of the residue condenser is connected to the condensate tank. The invention solves the problem that once the produced formic acid cannot be completely decomposed, it will remain in the system and accumulate to a certain extent, which will seriously affect the normal operation of the recovery system, or the DMF index of the production site will seriously exceed the standard.

Description

technical field [0001] The invention relates to a system for removing formic acid, in particular to a system for removing formic acid produced in the recovery process of dimethylformamide. Background technique [0002] During the rectification process in the recovery of dimethylformamide (DMF), a small amount of formic acid will be produced. In general recovery devices, formic acid will be removed by pyrolysis. The specific method is as follows: The DMF concentrated liquid is evaporated at high temperature to produce a small amount of formic acid and the DMF mixed liquid enters the bottom of the deacidification tower, and then is heated by the reboiler of the deacidification tower; evaporation is carried out from the bottom of the deacidification tower, and the formic acid is separated by the orifice plate packing in the deacidification tower and DMF; because formic acid is a heavy component, it accumulates at the bottom of the tower, and DMF, as a light component, rises to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C233/03C07C231/24
Inventor 刘连伟刘安秦王华华庆丰尉雷
Owner WUXI DOUBLE ELEPHANT MICRO FIBER MATERIAL
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