Extraction of metals in carbon dioxide and chelating agents ther

Details Extraction of metals in carbon dioxide and chelating agents ther Extraction of metals in carbon dioxide and chelating agents ther

1994-04-01

1997-06-24

Chang, Ceila

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

546255, 546335, 546336, 526247, 210634, C07D40106

Patent

active

056418876

ABSTRACT:
The present invention provides a chelating agent suitable for chelating metals metals in liquid or supercritical carbon dioxide. The chelating agent comprises generally a conventional chelating group and a CO.sub.2 -soluble functional group covalently attached to the chelating group. Examples of suitable CO.sub.2 -soluble functional groups include fluorinated polyether groups, silicone groups, fluorinated polyalkyl groups, phosphazene groups and fluorinated polyacrylate groups. The present invention also provides a method of extracting a metal from a matrix containing at least one other material and the metal using such CO.sub.2 -soluble chelating agents.

REFERENCES:
patent: 4031038 (1977-06-01), Grinstead
Hoefling et al "Design and Sythesis of Highly CO.sub.2 Soluble Surfactants and Chelating Agents" Fluid Phase Equil. 83 203-212 (1993).
Lainty et al "Separation of et al in as" Analytical Chem. 64 311-315 (1992).
Hseu et al "Spectrophotometric studies of Ni (II) of picolylauion" CA 84: 1273398 (1976).
Hseu et al "Spectrophotometric studies of Co (II) and Cu (III) Chelates of 2-picolyamion" CA 82: 116896u (1975).
Takateru et al "Lubricating agent of megnetic recording medium" CA 113:203657 (1990).

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