Thermal swing adsorption process for {HEAD ~ the removal} of dinitrogen oxide, hydrocarbons and {TAIL ~ other trace impurities} from air 
Thermal swing adsorption process for { HEAD ~ the removal } of dinitrogen oxide , hydrocarbons and { TAIL ~ other trace impurities } from air
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH