有色废弃聚酯的脱色与再利用研究进展

为提高有色废弃聚酯的再生利用率,对目前国内外废弃聚酯的回收方式和有色聚酯的脱色进展进行综述。首先通过对常用废弃聚酯回收方式进行对比分析,明确适用于有色废弃聚酯的回收方向及需要解决的问题;其次对聚酯的直接剥色方法进行总结,认为现有的剥色方法和剥色后产物的应用都存在局限性。在此基础上,分别针对有色废弃聚酯化学回收后固体产物的脱色、有机溶剂的脱色以及末端废水的脱色排放进行概述。最后,对有色废弃聚酯脱色及再利用过程中亟需解决的问题进行总结和展望,指出完善废弃聚酯的自动化分类分离系统、拓宽再生聚酯的应用领域、提高脱色技术的可行性和环保性将会成为有色废弃聚酯回收再利用的关键。

Research progress on decolorization and recycling of colored polyester waste

In order to improve the recycling rate of colored polyester waste, this paper reviewed the decolorization and recycling methods for polyester waste. The commonly used recycling methods were firstly analyzed and compared in order to identify the best method for tackling the colored polyester waste. As the second step in the review, direct peeling methods for colored polyester were summarized, and the results revealed that limitations existed with these methods and with the application of the recycled products. On this basis, the decolorization of solid products, organic solvents and terminal wastewater were studied. Finally, the need for decolorization in recycling of colored polyester waste was highlighted. It is suggested that automatic classification and separation systems of polyester waste should be established, the application fields of regenerated polyester be broadened, and the feasibility and environmental friendliness of these decolorization methods be enhanced. These problems will become the key to improving the recycling rate of colored polyester waste.