Treatment method for exhaust gases in production of profenofos

Abstract

The invention discloses a treatment method for exhaust gases in production of profenofos. The method comprises the following steps of: (1) introducing exhaust gases to a pre-treatment spraying tower; (2) treating the exhaust gases in a tail gas central treatment station; (3) performing low temperature plasma processing on the exhaust gases; (4) introducing the exhaust gases into a post-treatment spraying tower; and (5) discharging at high altitude. According to the invention, the exhaust gases are treated by a double dielectric barrier discharge low temperature plasma device, so that residual gases which are not absorbed in pre-treatment are thoroughly disposed to ensure that tail gas completely meet the standard and is discharged. Low temperature treatment further can improve the safety, so that the potential safety hazard is eliminated. According to the method provided by the invention, useful matters can be efficiently recovered in current step, so that the method is energy-saving and environmental-friendly. A mechanical vacuum pump is used in a trimethylamine recovery process, so that the vacuum absorbing effect is enhanced. A sealed water seal tank is further arranged in a bromopropane recovery process, so that the cooling recovery rate of bromopropane is ensured.

Description

technical field [0001] The invention relates to a method for treating waste gas, in particular to a method for treating waste gas produced in the production of profenofos with a physical and chemical method. Background technique [0002] The waste gas generated by the profenofos project mainly includes salt-forming exhaust, synthetic exhaust, by-product concentrated non-condensable gas and precipitation non-condensable gas. The main pollutants are trimethylamine and bromopropane, both of which are malodorous gases. The exhaust gas treatment effect in the prior art is not good, and no method for completely disposing of odorous exhaust gas has been found so far. [0003] In the prior art, there is recycling of trimethylamine and bromopropane produced in the production process. The trimethylamine recovery method is as follows: after being condensed by the first-grade ice brine, it is then absorbed by hydrojet, and the high-concentration trimethylamine solution recovered by cryo...

AI Technical Summary

Problems solved by technology

The vacuum absorption step in the original recovery method is water jet absorption. Compared with mechanical vacuum: the absorption efficiency is poor, and the vacuum power is poor.

The tail gases of trimethylamine and bromopropane are odorous gases in terms of environmental classification. Even if the exhaust emissions are reduced by traditional methods, they will still have a large odor impact.

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