METHOD FOR LACTIDE AND LACTIC ACID RECOVERY AT POLYLACTIDE (PLA) PRODUCTION STEPS

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 dissolve...

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Bibliographische Detailangaben
Hauptverfasser:	COSZACH, Philippe, VAN GANSBERGHE, Martin
Format:	Patent
Sprache:	eng
Schlagworte:	ACYCLIC OR CARBOCYCLIC COMPOUNDS CHEMISTRY COMPOSITIONS BASED THEREON HETEROCYCLIC COMPOUNDS MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS METALLURGY ORGANIC CHEMISTRY ORGANIC MACROMOLECULAR COMPOUNDS PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL SEPARATION THEIR PREPARATION OR CHEMICAL WORKING-UP TRANSPORTING
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Beschreibung
Zusammenfassung:	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.