Denolf Ruben, Doolaege Jordy C, Selmurzaeva Elina, Manhaeghe Dave, De Somer Tobias, Haris Muhammad, Vermeeren Nils, Kol Rita, Hogie Joël, De Meester Steven
Laboratory for Circular Process Engineering (LCPE), Department of Green Chemistry and Technology, Ghent University Campus Kortrijk, Sint-Martens-Latemlaan 2B, 8500, Kortrijk, Belgium.
Department of Industrial Engineering, University of Padova, Via Marzolo 9, 35131, Padova, Italy.
ChemSusChem. 2025 Sep 1;18(17):e202401756. doi: 10.1002/cssc.202401756. Epub 2025 Aug 7.
Polymer dissolution-precipitation recycling is a promising pathway to increase plastic recycling rates. One of the first steps in this process is the dissolution of the plastic, where it is important to understand and predict the dissolution kinetics, specifically for plastic waste. Therefore, the dissolution kinetics of a plasticized poly(vinyl chloride) sample (P-PVC), containing bis(7-methyloctyl) cyclohexane-1,2-dicarboxylate (DINCH), are analyzed in N-methyl-2-pyrrolidinone (NMP), cyclohexanone, methyl ethyl ketone (MEK), and 2-methyltetrahydrofuran (2-MeTHF). Additionally, the effects of the particle size (1090-2990 μm) and temperature (30-60 °C) are studied. As expected, lowering the particle size and increasing the temperature reduced the overall dissolution time. It is also found that the dissolution of the polymer and plasticizer occurred simultaneously, and that the fastest dissolution occurred in NMP, followed by cyclohexanone, MEK, and 2-MeTHF. Finally, both a chain disentanglement model and a first-order model with a diffusion-based rate coefficient are fitted to the experimental data to describe the dissolution behavior of the selected plastic waste. The first is found to be a slightly better description of the P-PVC dissolution profile in NMP, a known good solvent, while the latter is better at describing the dissolution in MEK and 2-MeTHF, the slowest analyzed solvents.
聚合物溶解-沉淀回收是提高塑料回收率的一条有前景的途径。该过程的首要步骤之一是塑料的溶解，了解和预测溶解动力学非常重要，特别是对于塑料废料而言。因此，在N-甲基-2-吡咯烷酮（NMP）、环己酮、甲乙酮（MEK）和2-甲基四氢呋喃（2-MeTHF）中分析了含有双（7-甲基辛基）环己烷-1,2-二羧酸酯（DINCH）的增塑聚氯乙烯样品（P-PVC）的溶解动力学。此外，还研究了粒径（1090-2990μm）和温度（30-60°C）的影响。正如预期的那样，降低粒径和提高温度缩短了总体溶解时间。还发现聚合物和增塑剂的溶解同时发生，并且在NMP中溶解最快，其次是环己酮、MEK和2-MeTHF。最后，将链解缠模型和具有基于扩散的速率系数的一级模型拟合到实验数据中，以描述所选塑料废料的溶解行为。发现前者对已知的良溶剂NMP中P-PVC的溶解曲线描述稍好，而后者在描述在分析的最慢溶剂MEK和2-MeTHF中的溶解方面表现更好。
