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