1999 Volume 78 Issue 2 Pages 129-139
Reactions of sour gas components, such as H2S, HCN and CO2 in COG, with diluted aqueous ammonia solution were studied through adsorption tests by means of packed tower.
In case of purifying COG containing a proper quantity of NH3, water washing method with a suitable L/G was found to be most effective for selectively removing H2S and HCN from COG.
Rates of absorbing reactions of sour gas components with aqueous ammonia solution are determined by gas film resistance, and then main factors for chemical engineering are obtainable by theoretical calculation based on inlet/ outlet gas properties.
In this paper, theoretical height of packed tower, compared with obserbed one, is discussed by means of calculating over-all gas-phase volumetric coefficient KGa based on Henry's law constant with chemical reaction derived from the previous work.