Reflux times {HEAD ~ less than 6 hours} can result in lower than desirable {TAIL ~ A/B mole ratios} in the product powder 
result in lower
Reflux times { HEAD ~ less than 6 hours } can result in lower than desirable { TAIL ~ A / B mole ratios } in the product powder
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL REL OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH