Table 1 illustrates a typical product composition distribution based on a mixed
C 3 –C 4 feed from an FCC unit expressed as weight percent of the olefins in the
charge stock. Feed olefin conversion is about 97 % for propylene and 93 % for
butenes, but this may vary somewhat depending on the state of the catalyst, the feed
composition, and the operating conditions. Table 2 provides typical distillation
properties of depentanized gasoline; actual composition will vary depending on
what vapor pressure adjustments are desired to adapt the product to the gasoline
LPG
product
olefinic feed
stabilizer column
surge drum
steam
reactor
flash system,
quench
LPG recycle
gasoline
Fig. 2 Catalytic condensation with plug flow reactor and quench
steam
LPG product
olefinic feed
stabilizer
column
steam
reactor
LPG recycle
gasoline
surge drum
Fig. 1 Catalytic condensation with tubular reactor
462
R.L. Mehlberg et al.