Asueta Asier, Arnaiz Sixto, Miguel-Fernández Rafael, Leivar Jon, Amundarain Izotz, Aramburu Borja, Gutiérrez-Ortiz Jose Ignacio, López-Fonseca Rubén
GAIKER Technology Centre, Basque Research and Technology Alliance (BRTA), Parque Científico y Tecnológico de Bizkaia, Edificio 202, 48170 Zamudio, Bizkaia, Spain.
Chemical Technologies for Environmental Sustainability Group, Chemical Engineering Department, Faculty of Science and Technology, University of the Basque Country (UPV/EHU), 48940 Leioa, Bizkaia, Spain.
Polymers (Basel). 2023 Oct 23;15(20):4196. doi: 10.3390/polym15204196.
The chemical recycling of poly(ethylene terephthalate) -PET- fractions, derived from actual household packaging waste streams, using solvolysis, was investigated. This recycling strategy was applied after a previous on-line automatic identification, by near-infrared spectroscopy -NIR-, and a subsequent selective sorting of the different PET materials that were present in the packaging wastes. Using this technology, it was possible to classify fractions exclusively including PET, virtually avoiding the presence of both other plastics and materials, such as paper, cardboard and wood, that are present in the packaging wastes, as they were efficiently recognised and differentiated. The simple PET fractions, including clear and monolayered materials, were adequate to be recycled by mechanical means meanwhile the complex PET fractions, containing highly coloured and multi-layered materials, were suitable candidates to be recycled by chemical routes. The depolymerisation capacity of the catalytic glycolysis, when applied to those complex PET wastes, was studied by evaluating the effect of the process parameters on the resulting formation and recovery of the monomer bis(2-hydroxyethyl) terephthalate -BHET- and the achieved quality of this reaction product. Comparable and reasonable results, in terms of monomer yield and its characteristics, were obtained independently of the type of complex PET waste that was chemically recycled.
研究了采用溶剂解对源自实际家庭包装废物流的聚对苯二甲酸乙二酯（PET）馏分进行化学回收的方法。这种回收策略是在先前通过近红外光谱（NIR）进行在线自动识别以及随后对包装废物中存在的不同PET材料进行选择性分类之后应用的。使用该技术，可以将仅包含PET的馏分分类，实际上避免了包装废物中存在的其他塑料以及纸张、纸板和木材等材料的存在，因为它们能够被有效识别和区分。包括透明和单层材料的简单PET馏分适合通过机械方式回收，而包含高色和多层材料的复杂PET馏分则是通过化学途径回收的合适候选物。通过评估工艺参数对所得单体对苯二甲酸双（2-羟乙基）酯（BHET）的形成和回收以及该反应产物的质量的影响，研究了催化醇解对那些复杂PET废物的解聚能力。就单体产率及其特性而言，无论化学回收的复杂PET废物类型如何，都获得了可比且合理的结果。
