Lane, Aitken, Dunner & Ziems
Treatment of gas containing hydrogen sulfide
 An effluent alkali salt solution obtained in the desulfurization of a hydrogen sulfide-containing gas by washing with an alkali wash solution is subjected to a two stage precipitation treatment at different temperatures to recover valuable components such as a vanadium compound, chelating agent, ADA, and active alkali salts while removing inactive salts such as sulfate and thiosulfate. 
Toa Oil Co., Ltd. Nittetu Chemical Engineering Ltd.
B Y B C B
B01D Y02W B01D C01B B01D
inventional additional inventional inventional inventional
Koji Masaru
Kashima Sano