Although the vertical orientation of {HEAD ~ the reactor} with {TAIL ~ inlet} at the top is preferred, it is appreciated that the flow direction can be reversed or the reactor may be slanted towards the horizontal 
with
Although the vertical orientation of { HEAD ~ the reactor } with { TAIL ~ inlet } at the top is preferred , it is appreciated that the flow direction can be reversed or the reactor may be slanted towards the horizontal
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL 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 OTH OTH OTH OTH