Method for the removal of carbon dioxide from combustion exhaust gas
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United States of America Patent
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Apr 28, 1998
Issued Date -
N/A
app pub date -
Aug 21, 1996
filing date -
Mar 9, 1994
priority date (Note) -
Expired
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Abstract
This invention provides a method for the removal of CO.sub.2 present in combustion exhaust gas which comprises bringing combustion exhaust gas at atmospheric pressure into contact with a mixed aqueous solution containing 100 parts by weight of an amino acid metal salt (X), 1 to 25 parts by weight of piperazine (Y), and optionally a copper compound in such an amount as to give a divalent copper ion concentration of 10 to 1,000 ppm based on the mixed aqueous solution, the amino acid metal salt being of the general formula CH.sub.3 NR.sup.1 CHR.sup.2 COOM (1) wherein R.sup.1 and R.sup.2 represent hydrogen atoms or lower alkyl groups, provided that R.sup.2 is a lower alkyl group when R.sup.1 is a hydrogen atom, and R.sup.2 is a hydrogen atom when R.sup.1 is a lower alkyl group, and M represents an alkali metal. Potassium dimethylaminoacetate is a preferred amino acid metal salt (X).
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