GAS HOLDUP IN A BENCH-SCALE DIRECT COAL-LIQUEFACTION REACTOR

Gas holdup was measured for gas-liquid (hydrogen gas/decrystallized an thracene oil/creosote oil) system and gas-slurry (hydrogen gas/Taiheiy o coal particles/decrystallized anthracene oil) systems in a 0.1 ton/d ay continuous direct coal liquefaction reactor. The measurements were carried out at temperatures ranging from 289K to 723K and a pressure o f 30 MPa by two methods, a differential pressure method for the gas-li quid systems and a gas-quenching method for the gas-slurry system. The gas holdups for both systems were correlated with the gas flow patter n just above the reactor entrance. Though the present gas holdup data were in reasonable agreement with those published by other investigato rs, a difference was found between the dependencies of gas holdup on s uperficial gas velocity in the preheater and in the reactor.