Process for converting a hydroxycarboxylic acid, or salts thereof, to an unsaturated carboxylic acid and/or its esters
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United States of America Patent
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Jul 13, 2010
Grant Date -
Mar 19, 2009
app pub date -
Sep 9, 2008
filing date -
Sep 17, 2007
priority date (Note) -
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Abstract
, at least 0.5 less that that of the salt of the hydroxycarboxylic acid. Where a hydrophobic acid is used, it must be immiscible in water, and its salt must also be immiscible in water, and the resulting multi-phase solution comprises an aqueous phase comprising the corresponding hydroxycarboxylic acid, as well as a non-aqueous phase comprising a neutralized acid. Alternatively, where the ion exchange resin is used, the aqueous solution of the ammonium salt of a hydroxycarboxylic acid is contacted with the resin, thereby converting the salt to a hydroxycarboxylic acid and capturing the ammonium cations on the resin. In either case, the aqueous solution is treated, such as by heating, to separate and recover the hydroxycarboxylic acid. The non-aqueous phase or resin is treated to separate and recover ammonia useful for preparing additional ammonium salt of a hydroxycarboxylic acid.
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