Appeal No. 95-2227
Application No. 08/048,964
The references relied upon by the examiner are:
Rosinski et al. (Rosinski) 3,758,403 Sept. 11, 1973
Young 4,356,338 Oct. 26, 1982
GROUNDS OF REJECTION
Claims 1-6, 10-12, and 18-19 stand rejected under 35 U.S.C. § 103. As evidence
of obviousness, the examiner relies upon Rosinski.
Claims 7-9, 13-17, and 20 stand rejected under 35 U.S.C. § 103. As evidence of
obviousness, the examiner relies upon Rosinski and Young.
We affirm-in-part.
BACKGROUND
At page 8 of the specification, appellants describe the invention as relating to a
catalytic cracking process for converting a heavy hydrocarbon feed to lighter products. The
described cracking process includes the steps of charging a heavy hydrocarbon feed to a
riser catalytic cracking reactor, while charging a hot fluidized solids catalyst mixture, from a
catalyst regenerator, to the base of the riser reactor. The catalyst mixture is said to contain
a physical mixture of regenerated base FCC cracking catalyst and separate particles of
shape selective zeolite cracking catalyst additive. The additive is described as containing
a catalytically effect amount of a zeolite having a silica:alumina ratio about 12 and a
Constraint Index of 1-12 in an amorphous support. This zeolite catalyst is exemplified by
ZSM-5. The process is said to produce cracked products including ethylene, propylene,
and a C5 + gasoline fraction.
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