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US 9,168,487 B2Granted
Alkanolamine-based carbon dioxide absorption solutions with reduced corrosivity
AssigneeLonza Ltd.
InventorsLarry Kent Hall, Joseph Kimler, Thomas Bedard
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Abstract
An aqueous carbon dioxide-absorbent solution comprising at least one alkanolamine and at least one quaternary ammonium salt is disclosed. A method of recovering carbon dioxide from a carbon dioxide-containing gaseous mixture and a method of reducing metal corrosion in an alkanolamine-based exhaust gas treating process are also disclosed.
Claims16
A method of recovering carbon dioxide from a carbon dioxide-containing gaseous mixture, comprising contacting said carbon dioxide-containing gaseous mixture with an aqueous absorbent solution comprising:
- (i) from 10% to 90% by weight, based on the total solution, of monoethanolamine;
- and
- (ii) from 0.01% to 1.0% by weight, based on the total solution, of at least one quaternary ammonium salt selected from the group consisting of didecyldimethylammonium bicarbonate, didecyldimethylammonium carbonate, and combinations thereof.
Dependencies are inferred from the claim text.