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Method for recovering toluene, butanone and dimethyl formamide from waste gas in wet synthetic leather production

A technology of dimethylformamide and a recovery method is applied in the field of recovery of toluene, butanone and dimethylformamide in waste gas produced by wet-process synthetic leather, which can solve the difficulty of enterprises, fail to meet environmental protection standards, and high operating costs Not inferior to other problems, to achieve obvious social benefits, low operating costs, good economic benefits

Inactive Publication Date: 2005-03-02
ZHEJIANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, both methods have relatively large disadvantages: although the spray tower water absorption technology can recover dimethylformamide with high efficiency, the absorption efficiency of toluene and butanone is very low, which cannot meet the requirements of environmental protection standards ;Although the activated carbon adsorption technology can effectively remove toluene, methyl ethyl ketone and dimethylformamide contained in the exhaust gas, it cannot realize the recovery of solvents, and the operating cost remains high, which is unbearable for enterprises.
It can be seen that the existing recovery and treatment technology is not suitable for the simultaneous recovery and treatment of toluene, butanone and dimethylformamide in the waste gas of wet synthetic leather production

Method used

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  • Method for recovering toluene, butanone and dimethyl formamide from waste gas in wet synthetic leather production

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The main absorption equipment of the small laboratory test device adopts a packed tower. The technical design parameters of the packed tower are as follows: the tower height is 1000mm, the tower inner diameter is 75mm, the tower wall thickness is 5mm. Part of the airflow with a certain temperature before entering the tower takes out the solute (toluene, methyl ethyl ketone) through the gas cylinder and enters the main air pipe, thereby artificially creating air containing a certain concentration of solute, and using a self-priming pump to pump the absorbent dimethyl formaldehyde into the main air pipe. The amide is pumped into the tower, the absorbent flows from the top of the tower to the bottom of the tower under the action of gravity, and the air and absorbent are mass-transferred on the surface of the packing. The concentration of organic matter in gas samples was determined by gas chromatography. Absorption liquid dimethyl formamide flow rate 25L / h. The relevant t...

Embodiment 2

[0022] Engineering application On the basis of the above experimental small test device, we applied the above recovery method to the waste gas treatment of wet synthetic leather production in a synthetic leather Co., Ltd. in Wenzhou, Zhejiang, and achieved success. Toluene, methyl ethyl ketone and dimethylformamide in the waste gas (DMF) is efficiently recovered.

[0023] parameters

Quantity

capacity

45000m 3 / h

temperature

70～80℃

pressure

Atmospheric pressure

DMF Concentration

2000mg / m 3

Toluene concentration

900mg / m 3

butanone concentration

300mg / m 3

[0024] According to the above design parameters and combined with the actual situation of the factory, we design the recovery device as shown in the attached figure.

[0025] 1. The main structures and equipment in the device are as follows:

[0026] (1) DMF-tolylbutanone absorption tower

[0027] Basic size: Φ3.0×20.0m

[00...

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PUM

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Abstract

The present invention uses two-stage absorption apparatus to absorb toluene, butanone, and dimethyl formamide separately from the waste gas. The first stage of the absorption apparatus has dimethyl formamide as absorbent to absorb toluene and butanone, and the second stage of the absorption apparatus has water as absorbent to absorb dimethyl formamide. Toluene, butanone and dimethyl formamide are recovered via the vacuum evaporating recovering system matched with the stages. The present invention realizes the separation, recovery and reuse of toluene, butanone and dimethyl formamide without introducing new organic component. The present invention has high efficiency, low power consumption and reliable running.

Description

technical field [0001] The invention relates to a method for recovering toluene, butanone and dimethylformamide in waste gas from wet-process synthetic leather production. Background technique [0002] Toluene, butanone and dimethylformamide are added as solvents in the wet synthetic leather production process, and most of these solvents are discharged into the environment along with the exhaust gas. The waste gas emitted by each wet-laid synthetic leather production line is as high as 45,000m 3 / h, the main organic components contained in it and their concentrations are: the concentration of dimethylformamide is 2000mg / m 3 , toluene concentration 900mg / m 3 , butanone concentration 300mg / m 3 , the temperature of the exhaust gas is 70°C to 80°C, and the pressure is normal pressure (the above data are provided by Wenzhou Environmental Monitoring Station). If this kind of organic waste gas is discharged directly without treatment, it will cause huge pollution to the environ...

Claims

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Application Information

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IPC IPC(8): B01D53/14C07B63/00C07C7/11C07C15/06C07C45/78C07C49/04C07C231/24C07C233/04
Inventor 何潮洪吴斌叶项群冯元群王丽华韦彦斐刘畅许明海
Owner ZHEJIANG UNIV
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