Patent ID: 9272239
Filing Date: 2016-03-01
CPC Classification: B01D,C10G,C10J,C10K,Y02E,Y02P

Claim Text:
1. A method for washing hydrogen sulfide and carbon dioxide from a gas obtainable by gasification of a carbonaceous biomass, the method comprising: a) contacting the gas with a first absorbent solution comprising transition metal ions in acidic aqueous solution, wherein the transition metal ions include copper, zinc, iron, cobalt or a mixture thereof; b) binding hydrogen sulfide present in the gas to said first absorbent solution; c) recovering the gas from step b); d) contacting the recovered gas from step c) with a second absorbent solution comprising an alkaline absorbent; e) binding carbon dioxide present in the recovered gas from step c) to said second absorbent solution; and f) recovering the gas obtained from step e).