Extraction of metals in carbon dioxide and chelating agents therefor
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United States of America Patent
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Jun 24, 1997
Grant Date -
N/A
app pub date -
Apr 1, 1994
filing date -
Apr 1, 1994
priority date (Note) -
Expired
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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.
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