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Method and device for simultaneously recycling methylbenzene and dimethyl formamide in industrial waste gas by using solvent

A technology of dimethylformamide and industrial waste gas, which is applied in chemical instruments and methods, separation methods, separation/purification of carboxylic acid amides, etc., to achieve the effects of reducing energy consumption, improving recovery rate, and large economic benefits

Active Publication Date: 2012-06-20
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Although researchers have proposed different solutions for the treatment of industrial waste gas containing DMF and toluene, there is no method for simultaneously absorbing DMF and toluene with one solvent.

Method used

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  • Method and device for simultaneously recycling methylbenzene and dimethyl formamide in industrial waste gas by using solvent
  • Method and device for simultaneously recycling methylbenzene and dimethyl formamide in industrial waste gas by using solvent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1) Taking the treatment of 3000Kg / h industrial waste gas as an example to perform simulation calculation, the feed composition is as follows: air is 80%; DMF is 10%; toluene is 10%.

[0027] 2) if figure 1 As shown, the absorption tower 7 operates at a pressure of 100kPa, and the operating temperature in the tower is 33.5 to 38.1°C; industrial waste gas (5) enters the atmospheric pressure absorption tower (7) from the bottom of the tower, and the circulating solvent (4) flows from the upper part of the tower Enter the absorption tower (7), after circulating water mixes with supplemented fresh water (3) enter the absorption tower (7) from the tower top; Wherein, the mass ratio of water and solvent NMF is 1: 3, and absorbent total amount and feed The ratio of tower waste gas volume is 8: 1; After water (3) and solvent (4) absorb and purify contained DMF and toluene therein, the waste gas that reaches the emission standard is discharged from the top of the absorption tower...

Embodiment 2

[0032] Basic technology is with embodiment 1, and concrete operation parameter is as follows:

[0033] 1) Taking the treatment of 3000Kg / h industrial waste gas as an example to perform simulation calculation, the feed composition is as follows: air is 80%; DMF is 10%; toluene is 10%.

[0034] 2) if figure 1As shown, the absorption tower 7 operates at a pressure of 101.33kPa, and the operating temperature in the tower is 33.5 to 38.1°C; industrial waste gas (5) enters the atmospheric pressure absorption tower (7) from the bottom of the tower, and the circulating solvent (4) from the tower The upper part enters the absorption tower (7), and after the circulating water is mixed with the supplemented fresh water (3), it enters the absorption tower (7) from the top of the tower; wherein, the ratio of water and solvent NMF is 1: 4, and the total amount of absorbent and the incoming The ratio of tower waste gas volume is 5: 1; After water (3) and solvent (4) absorb and purify DMF an...

Embodiment 3

[0039] Basic technology is with embodiment 1, and concrete operation parameter is as follows:

[0040] 1) Taking the treatment of 3000Kg / h industrial waste gas as an example to perform simulation calculation, the feed composition is as follows: air is 80%; DMF is 10%; toluene is 10%.

[0041] 2) if figure 1 As shown, the absorption tower 7 operates at a pressure of 120kPa, and the operating temperature in the tower is 31.5 to 38.7°C; industrial waste gas (5) enters the atmospheric pressure absorption tower (7) from the bottom of the tower, and the circulating solvent (4) flows from the upper part of the tower Enter the absorption tower (7), after circulating water mixes with supplemented fresh water (3) enter the absorption tower (7) from the top of the tower; Wherein, the proportioning of water and solvent NMF is 1: 5, and the absorbent total amount and enter the tower The ratio of waste gas volume is 4:1; after water (3) and solvent (4) absorb and purify the DMF and toluene...

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Abstract

The invention relates to a method and device for simultaneously recycling methylbenzene and dimethyl formamide in industrial waste gas by using a solvent. Water and a solvent N-formylmorpholine in a mass ration of 1:(3-5) are used as absorbents to simultaneously absorb methylbenzene and DMF (N,N-dimethylformamide) in waste gas in an atmospheric absorption tower, and primary vacuumized rectification and secondary vacuumized rectification are sequentially adopted to recycle the DMF and methylbenzene in the waste gas. The content of DMF in the waste gas after removing the methylbenzene and DMF is approximate to zero, and the content of methylbenzene can also be reduced to several ppm, thereby achieving the emission standard. The solvent in the method provided by the invention can be recycled, the DMF recovery rate is up to more than 99%, and the purity is up to 99.9%. The technique not only enhances the recovery value, but also reduces the emission of organic waste gas, thereby solving the problem that industrial waste gas can not be easily treated thoroughly in synthetic leather, textile, printing and dyeing and other industries. Therefore, the invention has high implementation value, social benefit, environmental benefit and economic benefit.

Description

technical field [0001] The invention relates to a method for removing and recovering harmful substances in waste gas, in particular to a method for recovering toluene and dimethylformamide from industrial waste gas, belonging to the field of separation and recovery of industrial waste gas. Background technique [0002] Most of the industrial waste gas in synthetic leather, textile, printing and dyeing industries contains a mixture of dimethylformamide (DMF) and toluene. Taking the synthetic leather industry as an example, my country began to produce artificial leather in the late 1950s, the second generation of synthetic leather in 1983, and the third generation of superfine fiber synthetic leather in 1994. In recent years, my country's synthetic leather industry has developed rapidly, and has now become the world's largest synthetic leather producer, consumer, and import and export trader. The synthetic leather industry is undergoing global adjustments, and the manufacturin...

Claims

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Application Information

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IPC IPC(8): C07C15/06C07C7/12C07C233/03C07C231/24B01D53/18
Inventor 张吕鸿张志恒刘玉花姜斌肖红
Owner TIANJIN UNIV
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