Process for purifying unsaturated carboxylic acids using distillation and melt crystallization
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United States of America Patent
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Jun 4, 1996
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N/A
app pub date -
Mar 28, 1994
filing date -
Mar 28, 1994
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Abstract
A process for the preparation of an .alpha.,.beta.-unsaturated C.sub.3 -C.sub.6 carboxylic acid of greater than 98% purity, which combines fractional distillation and melt crystallization procedures.
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