When the water content of {HEAD ~ the regenerated solution} of {TAIL ~ polyethylene glycol} is high enough to affect the desulfurization, it needs to be removed 
of
When the water content of { HEAD ~ the regenerated solution } of { TAIL ~ polyethylene glycol } is high enough to affect the desulfurization , it needs to be removed
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH