Recycling method of nitrogen oxide gas in diazotization reaction process

The invention belongs to the field of industrial waste gas treatment, and relates to a method for recycling nitrogen oxide gas in a diazotization reaction process. The method comprises the following steps: introducing NOX gas generated by reaction of a diazotization reagent into an absorption device...

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Hauptverfasser: DU CHENGYI, CAI CHUN
Format: Patent
Sprache:chi ; eng
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Zusammenfassung:The invention belongs to the field of industrial waste gas treatment, and relates to a method for recycling nitrogen oxide gas in a diazotization reaction process. The method comprises the following steps: introducing NOX gas generated by reaction of a diazotization reagent into an absorption device filled with concentrated sulfuric acid until the content of nitroso sulfuric acid in absorption liquid is 60-96 wt%; placing primary arylamine in a sulfuric acid solution, stirring to form a turbid liquid, dropwise adding the obtained absorption liquid into the turbid liquid, and reacting to prepare a diazonium salt solution; the nitrogen oxide gas generated in the diazotization reaction process can be absorbed, the absorption liquid can still serve as a diazotization reagent to be applied to the diazotization reaction, waste gas recycling is achieved, the process is simple, and high economic benefits are achieved. 本发明属于工业废气处理领域,涉及一种重氮化反应过程中氮氧化物气体的回收利用方法。该方法包括:将重氮化试剂反应产生的NOX气体,将其通入到装有浓硫酸的吸收装置中,直至吸收液中的亚硝基硫酸含量为60 wt