One specific example is the sweetening of {HEAD ~ kerosene} which involves oxidizing the mercaptans contained in {TAIL ~ the kerosene} 
One specific example is the sweetening of { HEAD ~ kerosene } which involves oxidizing the mercaptans contained in { TAIL ~ the kerosene }
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL