The role of the vapour phase in fluid coker cyclone fouling: Part 2. Liquid and vapour yields and compositions

The vapours derived from thermally cracked Athabasca bitumen were exposed t o temperatures between 490 degrees C and 560 degrees C in order to investig ate the effects of vapour phase thermal cracking on product yields and comp ositions. Raising the vapour phase temperature above the temperature at whi ch the vapours were derived increased both the yield of non-condensable vap ours and the amount of olefins in the produced gas. In addition, the liquid yield decreased with increasing vapour phase temperature and changes in li quid product composition were also observed. The H/C ratio of the liquid pr oduct decreased with increasing vapour phase temperature.