Method for preparing a dialkyl carbonate of dianhydrohexitol
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United States of America Patent
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Mar 19, 2013
Grant Date -
Feb 16, 2012
app pub date -
Sep 30, 2010
filing date -
Oct 1, 2009
priority date (Note) -
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Abstract
A method for preparing dialkyl carbonates of dianhydrohexitol, includes the following steps: (a) preparing an initial reaction mixture containing at least one dianhydrohexitol, at least two mole equivalents of a dialkyl carbonate of formula and a transesterification catalyst; (b) heating the reaction mixture to a temperature greater than or equal to the boiling temperature of the formed alcohol, or of the azeotrope thereof, in a reaction chamber preferably provided with a rectification column including a sufficient number of theoretical distillation plates to separate the resulting alcohol from the reaction mixture. Certain dialkyl carbonates of dianhydrohexitols produced by the method and the use thereof for synthesizing synthetic polymers are also described.
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