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