Sustainable physical recycling of rigid PVC waste: A biobased solvent approach for the recovery of PVC, TiO2, and CaCO3

IF 7.1 2区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Waste management Pub Date : 2025-04-19 DOI:10.1016/j.wasman.2025.114798

Annelore Aerts , Sandra Corderí Gándara , Maarten Rubens , Stijn Geudens , Tatsuhiro Kuwaba , Isabel De Schrijver , Karolien Vanbroekhoven , Kathy Elst

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Abstract

For the first time, rigid polyvinyl chloride (PVC) waste has been successfully recycled using a dissolution-precipitation approach with biobased solvents. Hansen Solubility Parameter, HSP, predictions guided the systematic selection of solvents, while a modified HSP approach was developed to estimate the required non-solvent amounts for efficient polymer precipitation. Among the tested biobased solvents cyrene, γ-valerolactone (GVL) and 2-methyltetrahydrofuran demonstrated excellent dissolution performance, with water, methanol or isopropanol serving as effective non-solvents. The GVL-water system was the most efficient, requiring less than 10% non-solvent to achieve nearly complete separation and recovery of both the polymer and inorganic fraction without inducing polymer degradation. This optimized system was applied to a commercial PVC formulation for window frames, an end-of-life PVC window frame and a rigid PVC tube, achieving over 95% polymer recovery. Additionally, the process successfully removed more than 99% of inorganic fillers, enabling the selective purification and co-valorization of CaCO₃ or the valuable TiO₂.

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硬质PVC废弃物的可持续物理回收：用于回收PVC、TiO2和CaCO3的生物基溶剂方法

刚性聚氯乙烯（PVC）废物首次成功地利用生物基溶剂的溶解-沉淀方法进行回收。Hansen溶解度参数（HSP）预测指导了溶剂的系统选择，同时开发了一种改进的HSP方法来估计有效聚合物沉淀所需的非溶剂量。在所测试的生物基溶剂中，以水、甲醇或异丙醇为有效溶剂，癸烯、γ-戊内酯（GVL）和2-甲基四氢呋喃具有良好的溶解性能。gvl -水体系是最有效的，它只需要不到10%的非溶剂，就可以在不引起聚合物降解的情况下实现聚合物和无机部分的几乎完全分离和回收。该优化系统应用于商用PVC窗框配方、报废PVC窗框和刚性PVC管，聚合物回收率超过95%。此外，该工艺成功地去除了99%以上的无机填料，实现了CaCO3或有价TiO2的选择性纯化和共价化。

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来源期刊

Waste management 环境科学-工程：环境

CiteScore

15.60

自引率

6.20%

发文量

492

审稿时长

39 days

期刊介绍： Waste Management is devoted to the presentation and discussion of information on solid wastes,it covers the entire lifecycle of solid. wastes. Scope: Addresses solid wastes in both industrialized and economically developing countries Covers various types of solid wastes, including: Municipal (e.g., residential, institutional, commercial, light industrial) Agricultural Special (e.g., C and D, healthcare, household hazardous wastes, sewage sludge)