Method for the removal of carbon dioxide from combustion exhaust gas
US5744110A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Aug 21, 1996 |
| Grant date | Apr 28, 1998 |
| Priority date | — |
| Expiry date | Aug 21, 2016 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02C20/40
- WIPO fieldChemical engineering
- WIPO sectorChemistry
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 EQU 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).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.