Preferably, however, one of the streams is passed through a palladium membrane to diffuse out {HEAD ~ the H2} to enrich the CO for use in {TAIL ~ the formate synthesis} 
Preferably , however , one of the streams is passed through a palladium membrane to diffuse out { HEAD ~ the H2 } to enrich the CO for use in { TAIL ~ the formate synthesis }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL