However, since {HEAD ~ the concentration} of the polar vinyl compound is low, the pressure crystallization must be performed at further lower temperatures, thereby bringing about a further decrease in {TAIL ~ separation efficiency} 
However , since { HEAD ~ the concentration } of the polar vinyl compound is low , the pressure crystallization must be performed at further lower temperatures , thereby bringing about a further decrease in { TAIL ~ separation efficiency }
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD 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 OTH TAIL TAIL TAIL TAIL TAIL TAIL