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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  • Abstract
  • Description
  • Claims
  • Application Information

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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

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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

Example Embodiment

[0017] Example 1

[0018] The main absorption equipment of the laboratory test device adopts a packed tower. The technical design parameters of the packed tower are as follows: tower height 1000mm, tower inner diameter 75mm, tower wall thickness 5mm, stainless steel wire mesh packing, packing height 700mm, air temperature 70~80℃, Part of the airflow with a certain temperature before entering the tower brings solutes (toluene, methyl ethyl ketone) into the main air pipe through the air drum, thereby artificially creating air with a certain concentration of solutes, and using a self-priming pump to remove the absorbent dimethyl methyl The amide is driven 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 mass transfer between the air and the absorbent is carried out on the surface of the packing. The concentration of organic matter in the gas sample was determined by gas chromatography. The flow rate of the a...

Example Embodiment

[0021] Example 2

[0022] The engineering application is based on the above-mentioned experimental pilot plant. We applied the above recovery method to the wet synthetic leather production waste gas treatment of a synthetic leather company in Wenzhou, Zhejiang, and succeeded. The waste gas contains toluene, methyl ethyl ketone and dimethyl formamide (DMF) is efficiently recycled.

[0023] Parameter

[0024] Based on the above design parameters, combined with the actual situation of the factory, we design the recovery device as shown in the attached picture.

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

[0026] (1) DMF-methyl butanone absorption tower

[0027] Basic size: Φ3.0×20.0m

[0028] Structure: The tower body is built with Q235A; the packing is SM350 packing, and the packing volume is 53m 3

[0029] Design parameters: empty tower gas velocity u=2.0m / s, DMF circulation volume L=42.0t / h

[0030] Absorption efficiency: designed t...

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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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