Appeal No. 1998-1278
Application No. 08/603,186
into contact with a carbon dioxide absorbent solution at the
atmospheric pressure, allowing the carbon dioxide absorbent
solution to absorb carbon dioxide from the combustion gas,
and, in the ensuing step,
heating the absorbent solution that has absorbed carbon
dioxide, to liberate carbon dioxide and regenerate the
carbon dioxide absorbent solution, and
circulating the regenerated solution for reuse, said
carbon dioxide absorbent solution consisting essentially of
an aqueous hindered amine solution; wherein said hindered
amine contains an alcoholic hydroxyl group in the molecule
and is an amine compound selected from a group consisting of
(A) compounds having a primary amino group being bound
to a tertiary carbon atom having two unsubstituted alkyl
groups,
(B) compounds having a secondary amino group having an
N atom bound to a group which is a chain of two or more
carbon atoms including the binding carbon atom and an
unsubstituted alkyl group which contains three or fewer
carbon atoms; and
(C) compounds having a tertiary amino group, at least
two groups bound to the tertiary amino group, each having a
chain of two or more carbon atoms including the binding
carbon atom, two of the groups bound to the tertiary amino
group, being unsubstituted alkyl groups;
provided that compounds having two or more amino
groups are excluded and cupric carbonate is added to said
carbon dioxide absorbent solution.
The prior art references relied upon by the examiner are:
Butwell 4,079,117 Mar. 14, 1978
Sartori et al. (Sartori) 4,217,236 Aug. 12, 1980
Pearce 4,440,731 Apr. 3, 1984
Lam et al. (Lam) 4,729,883 Mar. 8, 1988
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