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Development of a process using waste vegetable oil for separation of aluminum and polyethylene from Tetra Pak

机译：开发使用废植物油从利乐中分离铝和聚乙烯的方法

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Tetra Paks are multi-layer polycoated paperboards, which are widely used as aseptic packages for beverages. This packaging system allows distribution of products without refrigeration for long periods of time (Haydary et al., 2013). Owing to their widespread use, Tetra Paks contribute to significant part of municipal solid waste (MWS), and it is estimated that in Mexico, each person generates Tetra Pak waste of about 800 g/day (SEMARNAT, 2010). Thus, development of a separation or recycling process is currently important, especially for Tetra Pak packaging, owing to the enormous amount of Tetra Pak waste produced every day. In the present study, a process for the separation of aluminum and polyethylene from Tetra Pak was developed. The method was realized with used waste vegetable oil, which was previously utilized for cooking. The main purpose of this process was to generate products at low cost by consuming less energy and source materials. The separation process comprised eight stages. The polyethylene was washed with different solvents such as ethanol, chloroform, and isopropyl alcohol, while the aluminum was washed with ethanol. The obtained low-density polyethylene was characterized by IF-IR, thermogravimetric analysis (TGA), and differential scanning calorimetry (DSC). The percentage of low-density polyethylene in the final sample obtained after washing with isopropyl alcohol, chloroform, and ethanol was 73%, 68%, and 52%, respectively, and that of aluminum in the final sample obtained after washing with ethanol was 85%. Lastly, the results were compared in terms of the percentage of polymer content in the mixture used to produce pellets of poly-aluminum via extrusion in the industry. The findings revealed that the separation process proposed in this study could be an effective technology to recover aluminum and polyethylene from Tetra Pak. (C) 2014 Elsevier Ltd. All rights reserved.
机译：Tetra Paks是多层的多层涂布纸板，广泛用作饮料的无菌包装。这种包装系统可以长时间不冷藏地分配产品（Haydary等，2013）。由于其广泛使用，利乐桶占了城市固体废物（MWS）的很大一部分，据估计，在墨西哥，每个人每天产生约800克利乐桶废物（SEMARNAT，2010年）。因此，由于每天产生大量的利乐废料，因此分离或再循环工艺的发展目前非常重要，尤其对于利乐包装而言。在本研究中，开发了从利乐中分离铝和聚乙烯的工艺。该方法是使用以前用于烹饪的废植物油实现的。此过程的主要目的是通过消耗更少的能源和原材料来以低成本生产产品。分离过程包括八个阶段。聚乙烯用不同的溶剂例如乙醇，氯仿和异丙醇洗涤，而铝用乙醇洗涤。通过IF-IR，热重分析（TGA）和差示扫描量热法（DSC）对获得的低密度聚乙烯进行表征。用异丙醇，氯仿和乙醇洗涤后最终样品中低密度聚乙烯的百分比分别为73％，6​​8％和52％，用乙醇洗涤后最终样品中铝的百分比为85 ％。最后，根据工业上通过挤出生产聚铝粒料的混合物中聚合物含量的百分比对结果进行了比较。调查结果表明，这项研究中提出的分离工艺可能是从利乐回收铝和聚乙烯的有效技术。 （C）2014 Elsevier Ltd.保留所有权利。

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