METHOD FOR LACTIDE AND LACTIC ACID RECOVERY AT POLYLACTIDE (PLA) PRODUCTION STEPS
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United States of America Patent
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Issued Date -
Oct 17, 2024
app pub date -
Aug 1, 2022
filing date -
Aug 1, 2022
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Abstract
An improved method is described for producing polylactide (PLA) whereby various gas streams containing lactide, lactic acid and water are recovered, are sent onto an assembly of packed columns for condensation, are brought into contact with a fluid at least comprising water, lactic acid and dissolved lactide; the fluid leaving the assembly of packed columns is recovered and is or is not filtered, the aqueous solution obtained via at least one exchanger is heated and sent into a feed tank under agitation which is continuously fed with a lactic acid solution, and hydrolysis of the lactide contained in the aqueous solution is performed in this feed tank.
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