Process of extracting anions with quaternary amines
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United States of America Patent
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Oct 27, 1992
Grant Date -
N/A
app pub date -
Mar 6, 1990
filing date -
Mar 6, 1990
priority date (Note) -
Expired
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Abstract
An improved extraction system employing a quaternary amine to extract anions from an aqueous solution, particularly precious metals such as gold or silver from an aqueous alkaline solution. The improvement comprises the use of a weak organic acid (a compound providing an acidic proton) along with the quaternary amine. The improvement is useful in both liquid-liquid and liquid-solid extraction systems.
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