| 摘要 |
The present invention provides a chelating agent suitable for forming coordinated complexes with a metal in liquid and supercritical carbon dioxide of covalently bonded (i) a chelating group selected from the group consisting of a dithio carbamate, a thiol group, and a picolyl amine group, (ii) a non-electron withdrawing spacer group selected from (CH2)x; and (iii) a CO2-soluble functional group selected from (CF2CF2O)X, (CF2O)X, (CF2)X, and [CF2(CF3FO)]x. X is selected to be greater or equal to 3 and to minimize the electron withdrawing effect of the CO2-soluble functional group and to achieve a chelating agent solubility of at least a 10-3 gm/gm CO2. A solubility of at least 10-2 gm/gm CO2 is attained at a temperature in the range of approximately 0 DEG to 100 DEG C. and a pressure of approximately 500 to 5000 psi.
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