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