期刊
GREEN PROCESSING AND SYNTHESIS
卷 10, 期 1, 页码 361-373出版社
WALTER DE GRUYTER GMBH
DOI: 10.1515/gps-2021-0036
关键词
depolymerization; alkali hydrolysis; PET waste; chemical recycling; circular economy
资金
- German Federal Ministry of Education and Research (BMBF) [033R193B]
This study introduces a new method for efficiently recycling bilayered PET waste with a depolymerization degree exceeding 97%. By converting complex PET waste into valuable starting materials, this method supports the implementation of a circular PET economy. Increasing mechanical agitation can compensate for shorter residence time to achieve similar degrees of depolymerization.
This study presents a new approach for the recycling of bilayered PET waste in an efficient, continuous process with a depolymerization degree >97%. The complex PET waste was converted by chemolysis into its monomers ethylene glycol (EG) and the corresponding salt of terephthalic acid (TA) in a twin-screw extruder (TSE). Via this method, the starting materials for PET production were recovered, and highly contaminated PET waste and PET composite materials were transformed into valuable starting materials. The PE layer of the composite PET/PE material remained inert under depolymerization conditions and could be separated by filtration. An increase in the rotational speed by 200 rpm in the TSE reduced the residence time, but the degree of depolymerization was not affected in a proportional manner. Thus, the results indicate that a shorter residence time can be compensated with intensified mechanical agitation due to higher rotational speeds to obtain a similar degree of depolymerization. These results support the potential of this recycling concept to substantially contribute to the implementation of a circular PET economy.
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