Residue
Catalytic Cracking Process for Maximum Ethylene
and Propylene Production
- Publication date
- Publisher
Abstract
Effects
of operating conditions on residue fluid catalytic cracking
(RFCC) were studied in a pilot-scale FCC unit. Experimental results
indicated that both high reaction severity and long residence time
promoted the production of ethylene and propylene. A novel RFCC process
for maximum ethylene and propylene (MEP) production was further proposed,
which was characterized by high operating severity, application of
olefin-selective catalyst, and stratified reprocessing of light gasoline
and butenes. Simulation experiments of the MEP process demonstrated
that both light cycle gasoline and recycled butenes were effectively
converted; meanwhile, the semispent catalyst still retained sufficient
activity to further crack residue feedstock. When treating Daqing
AR, the MEP process yielded up to 8.85 wt % ethylene and 25.97 wt
% propylene. In contrast, due to elevated catalyst activity in a second-stage
riser, the two-stage riser MEP process produced more propylene and
LPG at the expense of light oil. Also, ethylene yield was still up
to a comparative level