Absorption of NO2 in a packed tower with Na2SO3 aqueous solution

✍ Scribed by Chen, Luke ;Lin, Jin-Wei ;Yang, Chen-Lu

• Publisher: American Institute of Chemical Engineers
• Year: 2002
• Tongue: English
• Weight: 579 KB
• Volume: 21
• Category: Article
• ISSN: 0278-4491
• DOI: 10.1002/ep.670210411

✦ Synopsis

This paper looks at the development of a two-stage chemical scrubber for NO, control. In the first stage, the mostpractical oxidizing agents for NO oxidation are sodium chlorite and sodium hypochlorite. Although a considerable amount of work has been done on the reaction kinetics of NO2 with N a S O 3 there are majorgaps in developing an N a S O particular importance is the rate of chemical absorption. A pilot-scale research program was initiated to evaluate the absorption rate of NO2 with Na#03 aqueous solution in a packed tower. The research is directed at obtaining height of a transfer unit (KTJ for NO2 absorption, and to determine reasonable operation conditions for the packed bed scrubber A sulfite concentration of 0.25 M is essential to have a reasonable HTU in 2 to 5 feet for a gas rate between 1,050 to 2,350 lb@ hr. The results indicate that the scrubbing effectiveness of NO2 increased with the L/G ratio, and an WG of more than 3 is required for high NO2 absorption. aqueous solution for NO2 absorption in the second stage. d f