{TAIL ~ The CO and H2 components} of the first stream are reacted under high pressures and, optionally, in the presence of a catalyst, such as a copper and zinc containing catalyst, to form {HEAD ~ methanol} and higher alcohols 
{ TAIL ~ The CO and H2 components } of the first stream are reacted under high pressures and , optionally , in the presence of a catalyst , such as a copper and zinc containing catalyst , to form { HEAD ~ methanol } and higher alcohols
TAIL TAIL TAIL TAIL 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 OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH