Appeal No. 2002-1010 Page 2
Application No. 09/206,210
elected invention (Brief, page 2; Answer, page 2, ¶3).2 We have
jurisdiction pursuant to 35 U.S.C. § 134.
According to appellants, the invention is directed to a
process for the catalytic cracking of olefins in which the
feedstock is contacted with an MFI crystalline silicate catalyst
having a silicon/aluminum atomic ratio of 180 to 1000, where the
catalyst has been prepared by a process in which aluminum atoms
have been removed from throughout the crystalline silicate
framework (Brief, page 3). Claim 9 is illustrative of the
invention and is reproduced below:
9. A process for the catalytic cracking of olefins in a
hydrocarbon feedstock which is selective towards light
olefins in the effluent, the process compromising3
contacting a hydrocarbon feedstock containing olefins having
a first composition of at least one olefinic component with
a MFI crystalline silicate catalyst having a
silicon/aluminum atomic ratio of from 180 to 1000 to produce
an effluent having a second composition of at least one
olefinic component, with the feedstock and the effluent
having substantially the same olefin content by weight
therein, the catalyst having been produced by heating the
catalyst in steam to remove aluminum from a crystalline
silicate framework of the catalyst and extracting aluminum
from the catalyst by contacting the catalyst with a
complexing agent for aluminum to remove, from pores of the
framework, aluminum deposited therein during the steaming
step, thereby to increase the silicon/aluminum atomic ratio
2All reference to and citation from the Brief is to the
Substitute Brief dated Sep. 10, 2001, Paper No. 19.
3This term apparently should read “comprising” (see the
specification, page 7).
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