Appeal No. 1997-3614
Application No. 08/433,272
This is a decision on an appeal from the examiner’s final
rejection of claims 1 through 28 which are all of the claims
pending in the application.
Claims 1 and 28 are representative of the subject matter
on appeal and read as follows:
1. In the method wherein impure vinyl chloride containing
a contaminating amount of monovinyl acetylene is contacted
with catalyst comprising ferric chloride to produce purified
vinyl chloride containing a reduced amount of monovinyl
acetylene, the improvement wherein the catalyst is a catalyst
system in which the ferric chloride is carried on an alumina
substrate and wherein the impure vinyl chloride and
substantially anhydrous hydrogen chloride are mutually
contacted with the catalyst system.
28. In the method wherein impure vinyl chloride
containing a contaminating amount of butadiene, monovinyl
acetylene, or both butadiene and monovinyl acetylene, is
contacted with catalyst comprising Lewis Acid to produce
purified vinyl chloride containing a reduced amount of
butadiene or monovinyl acetylene or both butadiene and
monovinyl acetylene, the improvement wherein the catalyst is a
catalyst system in which the Lewis Acid is carried on an
alumina substrate and wherein the impure vinyl chloride and
substantially anhydrous hydrogen chloride are mutually
contacted with the catalyst system.
As evidence of obviousness, the examiner relies on the
following prior art:
Gause et al. (Gause) 3,142,709 Jul. 28,
1964
McFadden 3,723,550 Mar. 27,
1973
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