REGENERATION OF AQUEOUS SOLUTION OF SULFIDE

摘要

H2S and CO2 from a waste gas are absorbed in an ammoniacal or alkali metal hydroxide solution. The resultant sodium, potassium or ammonium sulfide solution is reacted with pulverized copper oxide and the resultant copper sulfide precipitate is separated and the resultant solution of increased sodium hydroxide, potassium hydroxide or ammonia content is recycled as absorbent for hydrogen sulfide and CO2. The copper sulfide is roasted to form recyclable copper oxide and product sulfur dioxide.