Appeal No. 1998-2624
Application No. 08/696,578
dienes contained in the washed compressed cracked gas
stream to produce a hydrogenated washed compressed gas
stream;
(d) scrubbing said hydrogenated washed compressed
gas stream in an absorber tower with a scrubbing
solution comprising a metallic salt to form a scrubbed
gaseous stream substantially comprising hydrogen,
methane, ethane, propane and butane; and scrubbed
liquid stream substantially comprising ethylene,
propylene, butylenes and scrubbing solution;
(e) stripping said scrubbed liquid stream in an
olefin stripper to produce a stripped gas stream rich
in olefins and a lean liquid stream; and
(f) separating said stripped gas stream rich in
olefins into at least one of an ethylene-rich product
stream, a propylene-rich product stream and a butene-
rich product stream.
The examiner relies on the following prior art references
as evidence of unpatentability:
Rupp 2,514,294 Jul. 4, 1950
Dunlop et al. 3,401,112 Sep. 10, 1968
(Dunlop)
Montgomery 4,128,595 Dec. 5,
1978
Lendle et al. 4,810,798 Mar. 7, 1989
(Lendle)
Mehra et al. 5,326,929 Jul. 5, 1994
(Mehra)
The following grounds of rejection are presented for our
review in this appeal:
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