{TAIL ~ A waste stream} from the liquifier is recycled to {HEAD ~ the carbon dioxide PSA unit feed} 
{ TAIL ~ A waste stream } from the liquifier is recycled to { HEAD ~ the carbon dioxide PSA unit feed }
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD