Removal of Contaminants from Liquid-Liquid Extraction Solvent
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United States of America Patent
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Issued Date -
Aug 15, 2013
app pub date -
Apr 28, 2011
filing date -
Apr 29, 2010
priority date (Note) -
Abandoned
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Abstract
A method of treating a solvent in a wood processing operation is described. A first organic compound is extracted from an aqueous solution with a solvent. Then, the solvent is contacted with an alkali solution to remove a second organic compound from the solvent. For example, the first organic compound may be acetic acid and the second organic compound may be lignin. In another embodiment, a liquid-liquid extraction solvent used to extract acetic acid from an aqueous solution is rejuvenated by contacting the solvent with an alkali solution to remove a second organic compound from the solvent. The rejuvenated solvent is then recycled for further liquid-liquid extraction.
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