METHOD FOR PROCESSING LACTIDES
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United States of America Patent
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Issued Date -
Mar 27, 2025
app pub date -
Jan 20, 2023
filing date -
Jan 20, 2023
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Abstract
The invention pertains to a process for processing a crude lactide comprising the steps of: separating a crude lactide stream comprising L-lactide, D-lactide, and meso-lactide in one or more steps to form a meso-lactide stream comprising at least 50 wt. % of meso-lactide (based on the total weight of lactide in the stream) and at least one purified lactide stream comprising L-lactide and/or D-lactide; oligomerizing the meso-lactide stream to form an oligomer-containing stream comprising lactic acid oligomers; and depolymerizing the oligomer-containing stream to form a product stream comprising meso-lactide, L-lactide and D-lactide. The invention also pertains to a process for producing a polylactide and to a process for producing a racemic mixture of (S)-lactic acid and (R)-lactic acid.
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