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