Pharmaceutical blister packages usually comprise of aluminium and plastic layers. Due to their multi-material structure, the discarded packages are typically landfilled, although when separated, both metallic and polymeric fractions would be recyclable. In the present study, separation of aluminium and polymeric layers of waste pharmaceutical blisters was conducted by exploitation of deep eutectic solvent (DES, lactic acid - choline chloride) and pure lactic acid, both of which are considered green solvents. The separation of aluminium and plastic was investigated at different temperatures, solvent concentrations, solid-liquid ratios and agitation speeds. The complete separation was achieved with both studied solvents. The fastest separation was obtained when temperature was increased, more solvent with respect to solid was used and when agitation was introduced to the system. The effect of solvent concentration varied depending on the used solvent. Separation by lactic acid was the fastest with pure solvent (90 wt%), and separation by DES was the fastest with diluted solvent (50 wt%) due to strong dissolution of aluminium and formation of aluminium lactate precipitate. Polyvinyl chloride (PVC) and acrylic based adhesive were detected in all the investigated samples. After the separation by pure DES, the recovered aluminium fraction was corroded, containing 65 wt% of aluminium and 23 wt% of oxygen whereas after lactic acid treatment, aluminium surfaces contained at its best about 95% of aluminium (aluminium foil contains 96% of Al). The results showed that the DES used and lactic acid can offer viable green separation methodology for aluminium and plastic from blister packages.

中文翻译：

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从废塑料泡罩包装中回收铝和塑料的绿色溶剂。

药品泡罩包装通常由铝和塑料层组成。由于它们的多材料结构，被丢弃的包装通常被填埋，尽管当分离时，金属和聚合物部分都可以回收。在本研究中，通过利用深共熔溶剂（DES，乳酸-胆碱氯化物）和纯乳酸（它们都被认为是绿色溶剂）进行分离来分离废药品泡罩的铝层和聚合物层。研究了在不同温度，溶剂浓度，固液比和搅拌速度下铝和塑料的分离。用两种研究的溶剂均可实现完全分离。温度升高，分离速度最快，相对于固体，使用更多的溶剂，并且当将搅拌引入系统时。溶剂浓度的影响取决于所使用的溶剂。由于铝的强烈溶解和乳酸铝沉淀的形成，用纯溶剂（90 wt％）进行乳酸分离最快，而用稀释溶剂（50 wt％）进行DES分离最快。在所有调查的样品中均检测到了聚氯乙烯（PVC）和丙烯酸类粘合剂。通过纯DES分离后，回收的铝馏分受到腐蚀，其中包含65 wt％的铝和23 wt％的氧，而在乳酸处理后，铝表面最多包含约95％的铝（铝箔包含96％的铝Al）。