A process for chemically recycling polylactic acid (pla)
Номер патента: EP4381006A2
Опубликовано: 12-06-2024
Автор(ы): Jan Jager, Johan Albert Frans Kunst, Jorn Ekkehart BEHAGE, Marco BRONS
Принадлежит: Arapaha BV
Опубликовано: 12-06-2024
Автор(ы): Jan Jager, Johan Albert Frans Kunst, Jorn Ekkehart BEHAGE, Marco BRONS
Принадлежит: Arapaha BV
Реферат: The present invention pertains to a process for chemically recycling polylactic acid (PLA), the process comprising at least a first stage of depolymerisation of the PLA and a separate second consecutive stage of depolymerisation, to which first and second stages the PLA is subjected in a continuous manner, wherein in the first stage of the two consecutive stages, the PLA is continuously fed to an extruder operated at a temperature above the melting temperature of the PLA, while a first amount of water is co-fed to the extruder, in order to produce a fluid mixture comprising a melt of the at least partly depolymerised PLA, and in the second stage, the said 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 a second amount of 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. The invention also pertains to a product comprising PLA comprising coupled lactide monomers that form the PLA, the PLA having a D/L ratio for the lactide monomers, the product being provided with a persistent marking which indicates the said D/L ratio of the PLA comprised in the product.
A method of closed loop recycling of polylactic acid
Номер патента: US20240368368A1. Автор: Jan Jager,Johan Albert Frans Kunst,Jorn Ekkehart BEHAGE,Marco BRONS. Владелец: Arapaha B.V.. Дата публикации: 2024-11-07.