Hydrogen balance for catalytic pyrolysis of atmospheric residue

The catalytic pyrolysis of atmospheric residue over the commercial catalytic pyrolysis process catalyst (Al2O3/Fe2O3/Na2O (46.3, 0.27 and 0.04 wt.% respectively)) was investigated in a confined fluidized bed reactor. The yield of light olefins was above 37 wt.% at reaction temperature above 600 degrees C and it reached a maximum of 47 wt.% at 660 degrees C. The main components in light olefins were ethylene and propylene, and those in liquid samples were aromatics. The main components in light alkanes were propane and i-butane at low reaction temperature (600 degrees C), and those were methane and ethane at high reaction temperature (700 degrees C). The hydrogen content of light olefins was about 14.27 wt.%. that of light alkanes was above 18.5 wt.%, that of gasoline was below 12.5 wt.%, and that of diesel was below 7.8 wt.%. The percentage of the hydrogen in light alkanes to total hydrogen was above 29% and that in light olefins was above 40%. The effective utilization ratio of hydrogen decreased from 66.60% at 600 degrees C to 61.44% at 700 degrees C. (C) 2009 Elsevier B.V. All rights reserved.