Process for recovering and improving production of meso-lactide from a crude lactide containing stream
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United States of America Patent
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Feb 21, 2017
Grant Date -
Mar 10, 2016
app pub date -
May 6, 2014
filing date -
May 6, 2013
priority date (Note) -
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Abstract
A process for the recovery and production of meso-lactide from a crude lactide containing stream may include subjecting a starting crude lactide stream to a first distillation step to obtain: a top stream mainly containing meso-lactide; a bottom stream; and a side stream mainly containing L-lactide and meso-lactide. The process may include recovering the side stream and subjecting the side stream to a melt crystallization step to obtain: a first purified stream mainly containing L-lactide; and a drain stream mainly containing meso-lactide and L-lactide. The process may include recovering the top stream and drain stream, and subjecting the top stream and drain stream to a second distillation step to obtain a second purified stream containing L-lactide and meso-lactide.
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