Appeal No. 1996-3491
Application 08/213,347
BACKGROUND
The subject matter of the claims on appeal is directed to
a process for controlling afterburning in a fluid catalytic
cracking generator. Fluid catalytic cracking is a hydrocarbon
cracking process in which vaporized hydrocarbon feed is
cracked in the presence of microsperoidal catalyst particles
(specification, page 1, lines 22-24). During the cracking
process, carbonaceous material deposits on the surface of the
catalyst and essentially coats it (specification, page 2, line
1) to produce a catalyst which is referred to as “coked”
(specification, page 2, lines 1 and 2). Eventually, the
accumulation of carbonaceous material deactivates the catalyst
to the point that it becomes ineffective in enhancing the
equilibrium balance of the cracking reaction under standard
cracking conditions (specification, page 2, lines 4-10), and
such a deactivated catalyst is then referred to as a “spent”
catalyst which requires regeneration. For this purpose, the
catalyst is transferred to a regeneration section of a fluid
catalytic cracking unit wherein the coated coke on the
catalyst is combusted by injection of air into a bed of the
spent catalyst in the regenerator section. However,
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