aliphatic diols
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United States of America Patent
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Mar 27, 2012
Grant Date -
Oct 21, 2010
app pub date -
Jul 7, 2008
filing date -
Jul 30, 2007
priority date (Note) -
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Abstract
A process of refining a crude C6-C16 aliphatic diol, preferably, a C6-C16 monocyclic aliphatic diol, more preferably, an isomeric mixture of cis/trans-(1,3)(1,4)-cyclohexanedimethanol, containing in addition to the diol one or more impurities selected from phenols, and aliphatic mono-ols, esters, carboxylic acids, and hemiacetals, and mixtures thereof. The refining process involves distilling the crude C6-C16 aliphatic diol in the presence of an alkali or alkaline earth metal compound, preferably, an excess thereof relative to acid equivalents present in the diol.
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