After the cracked gas is cooled, higher alkynes are removed from the cracked gas, then the acetylene is separated preferably by scrubbing with {HEAD ~ an absorption agent} selective for {TAIL ~ acetylene} 
selective for
After the cracked gas is cooled , higher alkynes are removed from the cracked gas , then the acetylene is separated preferably by scrubbing with { HEAD ~ an absorption agent } selective for { TAIL ~ acetylene }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL