{HEAD ~ The process} 16 where the reaction is conducted at {TAIL ~ a temperature} between about 220° and about 300° C 
{ HEAD ~ The process } 16 where the reaction is conducted at { TAIL ~ a temperature } between about 220 ° and about 300 ° C
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH