VALORISATION OF LACTIC ACID STREAM IN THE PRODUCTION PROCESS OF POLYLACTIC ACID

• Main Authors: COSZACH, Philippe, MORLOT, Julien
• Format: Patent
• Language: English; French; German
• Published: 03.07.2024
• Subjects: ACYCLIC OR CARBOCYCLIC COMPOUNDS; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; CHEMISTRY; COMPOSITIONS BASED THEREON; GENERAL PROCESSES OF COMPOUNDING; METALLURGY; ORGANIC CHEMISTRY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; WORKING-UP

The present invention discloses a valorisation method of a flux containing undesired lactic acid (ester(s)) in the production process of polylactic acid, the lactic acid and/or the lactic acid ester(s) obtained by recycling during the various stage of the production of polylactic acid are forming a recycle stream, 0 to 100% by weight of which are subjected to a treatment in order to selectively separate a fraction containing L-lactic acid and/or L-lactic acid ester(s) from a fraction containing D-lactic acid and/or D-lactic acid ester(s); and 100 to 0% by weight of said recycle stream are used as a base for the synthesis of molecules insensitive to the optical isometry D or L of lactic acid and/or of lactic acid ester(s).