Then the coating solution is sprayed on the surfaces and {HEAD ~ the reactor} is drained of {TAIL ~ the excess solution} in such a way that the solution can be sent to a recovery system, if desired 
is drained of
Then the coating solution is sprayed on the surfaces and { HEAD ~ the reactor } is drained of { TAIL ~ the excess solution } in such a way that the solution can be sent to a recovery system , if desired
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH