Method and device for dimethylamine waste gas treatment through aeration cooling neutralization method

Abstract

The invention belongs to the technical field of waste gas treatment, and in particular relates to a method and a treatment device for treating dimethylamine waste gas by aeration, cooling and neutralization. The device for aeration, cooling, neutralization and legal treatment of dimethylamine waste gas includes a primary sulfuric acid aeration contact cooling tank, a secondary sulfuric acid aeration contact cooling tank, a lye spray tower, and a plasma photocatalytic integrated machine. A Roots blower is connected to the aerator conveying pipe at the bottom of the first-stage sulfuric acid aeration contact cooling tank. A circulating refrigeration coil is installed in the first-stage sulfuric acid aeration contact cooling tank, and a first-stage sulfuric acid aeration contact cooling tank is installed on the top. an exhaust duct. The dimethylamine waste gas treatment method and device of the present invention use the waste gas to circulate in the sulfuric acid solution, control the volume and number of bubbles through the design of the aerator, improve the turbulence of the sulfuric acid liquid, and increase the installation of the aerator The depth prolongs the contact time between the air bubbles and the treatment material, and further improves the treatment efficiency of dimethylamine.

Description

technical field [0001] The invention belongs to the technical field of waste gas treatment, and in particular relates to a method and a treatment device for treating dimethylamine waste gas by means of aeration, cooling and neutralization. Background technique [0002] Synthetic leather is also known as artificial leather. In the production process, dimethylformamide DMF is widely used as a solvent in the surface treatment of synthetic leather and the wet transfer film surface treatment process of split leather. Because DMF is only used as a carrier solvent without chemical reaction, all of which enter the production wastewater. Most of the rectification methods are currently used to recover DMF, but in the recovery process, DMF will react with water to generate dimethylamine and formic acid. [0003] Dimethylamine, with the molecular formula (CH3)2NH, has a gas that smells like fishy amine at room temperature. The boiling point is 6.8°C, and it is easily 02 soluble in wat...

AI Technical Summary

Problems solved by technology

[0005] 1. The acid and dimethylamine waste gas cannot be fully mixed, and the effective contact or contact surface and residence time are not enough

[0006] 2. The salt produced by the reaction of acid and alkali has become dense granular salt, resulting in insufficient lift of the pump, and the spray nozzle of the spray is easy to block

[0007] 3. The reaction between dimethylamine and acid will increase the temperature of dimethylamine sulfate solution, and high temperature will produce secondary dimethylamine and the non-condensable gas in dimethylamine cannot be condensed in place

[0008] In terms of processing equipment: plate towers and packed towers are the most commonly used absorption equipment at present. The absorption effects of packed towers vary greatly according to the different fillers selected. The operation resistance is small and the cost is cheap; the structured packing has uniform liquid distribution and good absorption effect, but the resistance is high, the cost is high, and it is prone to clogging; the plate tower has a large operating range, is easy to clean, and the cost is cheap, but the operation resistance is large , the absorption effect is poor

At present, experts have used packed towers and plate towers in series in waste gas treatment, but there is no example of combining packed towers and plate towers in the same tower

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