METHOD FOR RECOVERING LACTIDE AND LACTIC ACID DURING POLYLACTIDE (PLA) PRODUCTION STEPS

An improved method for producing polylactide (PLA) is described that consists in recovering the various gaseous streams containing lactide, lactic acid and water, in sending them to a set of packed columns in order to condense them, in bringing them into contact with a fluid comprising at least wate...

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Bibliographic Details
Main Authors COSZACH, Philippe, VAN GANSBERGHE, Martin
Format Patent
LanguageEnglish
French
German
Published 12.06.2024
Subjects
CHEMISTRY
COMPOSITIONS BASED THEREON
MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
METALLURGY
ORGANIC MACROMOLECULAR COMPOUNDS
THEIR PREPARATION OR CHEMICAL WORKING-UP
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Summary:An improved method for producing polylactide (PLA) is described that consists in recovering the various gaseous streams containing lactide, lactic acid and water, in sending them to a set of packed columns in order to condense them, in bringing them into contact with a fluid comprising at least water, lactic acid and dissolved lactide, in recovering the fluid leaving the set of packed columns, in optionally filtering this fluid, in reheating the aqueous solution obtained via at least one exchanger, in sending it to a stirred tank fed continuously with a solution of lactic acid and in performing, in this tank, the hydrolysis of the lactide present in the aqueous solution.
Bibliography:Application Number: EP20220758233