A PROCESS FOR CHEMICALLY RECYCLING POLYLACTIC ACID (PLA)
A process for chemically recycling polylactic acid (PLA), includes at least a first stage of depolymerisation of the PLA and a separate second consecutive stage of depolymerisation, to which stages the PLA is subjected in a continuous manner, wherein in the first stage, the PLA is continuously fed t...
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| creator | KUNST, Johan Albert Frans JAGER, Jan BEHAGE, Jorn Ekkehart BRONS, Marco |
| description | A process for chemically recycling polylactic acid (PLA), includes at least a first stage of depolymerisation of the PLA and a separate second consecutive stage of depolymerisation, to which stages the PLA is subjected in a continuous manner, wherein in the first stage, the PLA is continuously fed to an extruder operated at a temperature above the melting temperature of the PLA, while a water is co-fed to the extruder, in order to produce a fluid mixture including a melt of the at least partly depolymerised PLA, and in the second stage, the fluid mixture is continuously fed to a continuously stirred tank reactor (CSTR) operated at a temperature above the melting temperature of the PLA, while co-feeding water to the CSTR, wherein a residence time in the CSTR is used to provide at the outlet of the CSTR a continuous stream of PLA depolymerised into an oligomeric ester. |
| format | Patent |
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| language | eng ; fre ; ger |
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| subjects | AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G CHEMISTRY COMPOSITIONS BASED THEREON GENERAL PROCESSES OF COMPOUNDING METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-UP WORKING-UP |
| title | A PROCESS FOR CHEMICALLY RECYCLING POLYLACTIC ACID (PLA) |
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