Simultaneous recovery and continuous extraction of substantially pure carboxylic acids and ammonium salts from acid hydrolysis reaction mixtures
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United States of America Patent
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Issued Date -
Jul 12, 2007
app pub date -
Jan 12, 2006
filing date -
Jan 12, 2006
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Abandoned
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Abstract
A continuous or batch process for the production and recovery of substantially pure carboxylic acids and ammonium salts from a corresponding nitrile. By controlling the amount of water used in the reaction, a biphasic reaction mixture forms which facilitate simultaneous recovery of both fractions. In a preferred embodiment, using propionitrile as the starting material and strong sulfuiric acid, propionic acid of approximately 98% purity is produced in the upper phase. A combination of hydrochloric and sulfuric acid can reduce the total reaction volume.
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