Question

169. Experimental AH, benzene is
-156 KJ / m AH of Hydrogenation ofCyclone hexene is -119 KJ/m, then
Calculate R.E of benzene
A) -49 KJ / m
B) -36 KJ / m
C) +49 KJ / m
D) +36 KJ / m​

Answer 1

Deposition of carbonaceous material in the cyclone exit line is a chronic problem for fluid cokers and is a key process limitation to achieving longer run length. Extensive characterization studies were conducted for laboratory deposits from a bench-scale bitumen coker using modern analytical techniques, e.g., elemental analysis, X-ray fluorescence, thermogravimetric analysis, scanning electron microscopy, diffusive reflection infrared spectroscopy, and solid-state 13C nuclear magnetic resonance. Simulated distillation was also applied to solvent extracts of deposits. Results substantiate that on the laboratory scale physical condensation rather than chemical reaction was the primary reason for fluid coker cyclone exit line fouling. Entrained liquid droplets also contribute to the deposit formation. Although there are both polyaromatic and aliphatic structures in fresh laboratory deposits, the former dominate. High-temperature operation led to deposits an increased polyaromatic content. Industrial deposits are more cokelike than laboratory deposits, and they differ in morphology.