Process for purification of phosphate esters
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United States of America Patent
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Jul 20, 2010
Grant Date -
Jun 17, 2004
app pub date -
Feb 8, 2002
filing date -
Feb 8, 2001
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Abstract
A crude phosphate ester product can be purified by first washing it with chelating agent composition (such as a dilute acidic solution) and then, preferably, water, drying the resulting product, and then treating the resulting product with an acid scavenger, as exemplified by an epoxy-containing compound, such as 3,4-epoxy cyclohexyl methyl-3,4-epoxy cyclohexyl carboxylate.
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