Method for the production of cyclic diesters, in particular dilactide
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United States of America Patent
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Aug 30, 2016
Grant Date -
Sep 24, 2015
app pub date -
Oct 23, 2013
filing date -
Oct 26, 2012
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Abstract
The present invention relates to a method for the production of cyclic carboxylic acid esters, in particular intramolecular lactones, such as e.g. dilactide, the production of these cyclic esters from oligomeric carboxylic acids being effected by cyclizing depolymerization. During this reaction, a condensation product of these oligomeric carboxylic acids is produced as by-product, i.e. a mixture of higher-molecular oligomeric carboxylic acids which are hydrolyzed in a further step and hence recovered. This hydrolysate can be added again to the cyclizing depolymerization which is implemented in the first step.
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