Treatment method for mixed organic waste gas containing chlorine, hydrogen chloride and oxynitride

Abstract

The invention discloses a treatment method for mixed organic waste gas containing chlorine, hydrogen chloride and oxynitride. The method is capable of not only achieving a favorable removal effect on oxynitride, but also achieving a favorable removal effect on chlorine. A condensation unit, an absorbing unit and an adsorption unit are adopted in the treatment method, wherein the condensation unit adopts one-grade condensation; the absorbing unit adopts four-grade absorption; the absorption unit adopts two-grade absorption; waste gas firstly passes through a cooler and a demister of the condensation unit, so that VOCs with relatively high boiling points in the waste gas are cooled as much as possible and then recycled; then the waste gas enters into an aqueous urea solution absorption tower of the absorbing unit, and nitric oxides and chlorine in the waste gas are completely oxidized, reduced, decomposed and absorbed by virtue of a catalytic absorption reaction, so that nitrogen and chlorine are removed; the waste gas with nitrogen and chlorine removal enters into an aqueous falling film solution absorption tower of the absorbing unit, so that by-product hydrochloric acid is obtained; finally, the residual waste gas passes through an absorption tower of the absorption unit, so that the residual VOCs are adsorbed, and thus up-to-standard release is achieved.

Description

technical field [0001] The invention relates to a treatment method for organic waste gas, more specifically to a treatment method for mixed organic waste gas containing chlorine, hydrogen chloride and nitrogen oxides. Background technique [0002] In pharmaceutical chemical, pesticide chemical, fine chemical and petrochemical industries, chlorination and nitration reactions are widely used to produce important chemical products. During the production process, a large amount of organic waste gas (VOCs) containing hydrogen chloride, chlorine, nitrogen oxides, etc. will be generated. ). These waste gases are more difficult to deal with than ordinary VOCs and are more harmful. On the one hand, there are many types of VOCs and complex components; on the other hand, the treatment of chlorine and nitrogen oxides is very troublesome and harmful. If not handled properly, light It will seriously pollute the environment, and seriously, personal injury and death accidents will occur, c...

AI Technical Summary

Problems solved by technology

The general compound types are organic compounds such as hydrocarbons (alkanes, olefins and aromatics), ketones, esters, alcohols, phenols, aldehydes, amines, nitriles (cyanides), and there are various kinds of compounds in the above methods. For example, the main advantage of the catalytic combustion method is high purification efficiency and no secondary pollution. The problem is that the catalyst has high cost, short service life, difficult maintenance, and pretreatment is required when dealing with complex VOCs; the condensation method can only deal with high concentration, The range of gas flow is small, and the scope of use is relatively limited; adsorption or absorption methods generally use a large amount of adsorbent or absorption liquid, which is not only costly but also prone to secondary pollution

In many cases, adopting a purification technology is often difficult to meet the governance requirements, and it is not economical

From the content disclosed in the above prior art, it can be seen that there is no method for treating mixed waste gas containing chlorine, hydrogen chloride, nitrogen oxides and organic waste in the existing waste gas treatment methods, so it is necessary to develop a method for treating chlorine, hydrogen chloride, nitrogen oxides and A Simple, Practical and Economical Way to Mix VOCs in Exhaust Gas

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