Purification and recovery of acetonitrile from waste solvent acetonitrile
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United States of America Patent
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Jan 18, 2005
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app pub date -
Jul 23, 1999
filing date -
Jul 23, 1999
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Abstract
A process of treating waste solvent acetonitrile streams which contain at least one water extractable impurity such as isopropyl acetate to remove substantially all of the impurity by distilling the waste solvent acetonitrile in the presence of water for a time sufficient to allow the water extractable impurity to be extractively distilled from the acetonitrile. In preferred embodiments of the present invention the feed may contain either a mixture of waste solvent acetonitrile and crude acetonitrile or crude acetonitrile free of hydrogen cyanide by itself.
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