Appeal No. 1998-1278
Application No. 08/603,186
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 which 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 more 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 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.
10. A process for reducing the corrosion rate of carbon
steel from a carbon dioxide absorbent solution employed in a
process for removing carbon dioxide from a combustion gas
which comprises: in an apparatus made from carbon steel,
bringing the combustion gas containing oxygen and gas carbon
dioxide
3
Page: Previous 1 2 3 4 5 6 7 8 9 10 11 12 13 Next
Last modified: November 3, 2007