Babban fasali da fasali:
A karkashin aikin dumama iska mai zafi da convection a cikin sashin tanda, fim ɗin keɓancewa ya canza CH₂ Cl₂ akan saman, wanda ɓangaren gas ɗin gas ɗin yana cikin ruwa, wani ɓangare na iskar wutsiya mara ƙarfi ana amfani dashi azaman busasshen iskar gas, kuma Ana fitar da wani sashi a cikin tsarin dawo da iskar gas na wutsiya. Mun zaɓi musamman na musamman kwakwa harsashi kunna carbon, wanda yana da abũbuwan amfãni daga manyan CH₂ Cl₂ adsorption iya aiki, high tsarkakewa dace da mai kyau hydrophobicity. A cikin nau'i na tanki adsorption a kwance, ƙarfin cajin carbon yana da girma, sassaucin aiki yana da girma, ƙimar gas ɗin wutsiya na CH₂ Cl₂ ƙasa da 20mg / m³, kuma ƙimar dawowa ya fi 99.97%.