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
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[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...
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[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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