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Self-regenerative rectification system and recovery method for dimethylformamide

A technology of dimethylformamide and rectification system, which is applied in the field of dimethylformamide self-regenerating rectification system and recovery, can solve problems such as increased equipment investment, save operating costs, shorten process flow, save steam and The effect of the use of circulating water

Pending Publication Date: 2019-02-22
天津乐科节能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the actual recovery process, the number of effects of multi-effect distillation can be 2 to 4. As the number of effects increases, the investment in equipment also increases.

Method used

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  • Self-regenerative rectification system and recovery method for dimethylformamide
  • Self-regenerative rectification system and recovery method for dimethylformamide
  • Self-regenerative rectification system and recovery method for dimethylformamide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A self-regenerating rectification system for dimethylformamide, comprising: a dehydration tower 101, a refining tower 102 and a deacidification tower 103, a first steam outlet between the top steam outlet of the dehydration tower 101 and the heat source inlet of the reboiler of the tower kettle A compressor 104 is provided with a secondary preheater between the inlet of the tower top reflux tank (not shown) of the dehydration tower and the heat source outlet of the tower still reboiler of the tower, for dehydration tower feed and from The tower top steam flowing out of the reboiler of the tower is used for heat exchange, and a first-stage preheater is arranged before the second-stage preheater, which is used for heat exchange between the feed of the dehydration tower and the material extracted from the tower top reflux tank of the tower. A tertiary preheater 113 is arranged between the discharge port of the dehydration tower bottom and the feed port of the refining tower...

Embodiment 2

[0035]A self-regenerating rectification system for dimethylformamide, comprising: a dehydration tower 101, a refining tower 102 and a deacidification tower 103, a first Compressor 104 is provided with a secondary preheater 112 between the inlet of the tower top reflux tank of the dehydration tower and the heat source outlet of the tower kettle reboiler of the tower, which is used for dehydration tower feed and reboiler from the tower The outgoing steam at the top of the tower is used for heat exchange, and a first-stage preheater 111 is provided before the second-stage preheater, which is used for heat exchange between the feed of the dehydration tower and the material extracted from the tower top reflux tank of the tower. A tertiary preheater 113 is arranged between the discharge port of the dehydration tower bottom and the feed port of the refining tower, and is used for preheating the feed of the refining tower with the top steam flowing out from the reboiler of the refining...

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Abstract

The invention discloses a self-regenerative rectification system for dimethylformamide. The rectification system comprises a dehydrating tower, a refining tower and a deacidification tower and is characterized in that a first compressor is arranged between a steam outlet at the top of the dehydrating tower and a heat source inlet of a reboiler of a tower kettle of the dehydrating tower, a second compressor is arranged between a steam outlet at the top of the refining tower and a heat source inlet of a reboiler of a tower kettle of the refining tower, and a third compressor is further arrangedbetween an outlet of the second compressor and a heat source steam inlet of the reboiler of the tower kettle of the refining tower. Compared with a quadruple-effect rectification system with the sameheat load, the rectification system has the advantages that the number of rectifying towers is decreased to be 3 (the number of rectifying towers of the quadruple-effect rectification system is 5), and the process is shortened; and the self-regenerative rectification system is adopted, by using electric energy, the compressors are driven to compress and heat steam at the tower top to serve as a heat source of the tower kettles, so that a large amount of steam and circulating water are saved, and the operating cost can be saved by more than 14 million yuan every year.

Description

technical field [0001] The invention belongs to the technical field of solvent recovery, and in particular relates to a dimethylformamide self-regenerating rectification system and a recovery method. Background technique [0002] Dimethylformamide (DMF) has a strong dissolving ability. Except for halogenated hydrocarbons, it can be miscible with water and most organic solvents in any proportion. Therefore, it is known as a "universal solvent" and has been widely used. It is widely used in various production industries such as tanning, chemical industry, medicine and pesticide. The synthetic leather industry alone discharges nearly 100 million tons of DMF-containing wastewater every year. DMF wastewater has the characteristics of high toxicity, unpleasant smell, and not easy to decompose. In the workplace, it can enter the human body through the respiratory tract and skin, and cause damage to organs such as the liver, kidney and lungs, and even cause death in severe cases. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C231/24C07C233/03
CPCC07C231/24C07C233/03
Inventor 夏君君
Owner 天津乐科节能科技有限公司
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