Controlling gas to slurry volume ratio to achieve a gas holdup of about 0.4 when heating a flowing coal oil slurry and {HEAD ~ a hydrogen} containing {TAIL ~ gas stream} allows operation with virtually any coal to solvent ratio and permits operation with efficient heat transfer and satisfactory pressure drops 
Controlling gas to slurry volume ratio to achieve a gas holdup of about 0.4 when heating a flowing coal oil slurry and { HEAD ~ a hydrogen } containing { TAIL ~ gas stream } allows operation with virtually any coal to solvent ratio and permits operation with efficient heat transfer and satisfactory pressure drops
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 HEAD REL 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