通过热解油化工艺从致密化消费后塑料混合物中回收对苯二甲酸。
Recovery of Terephthalic Acid from Densified Post-consumer Plastic Mix by HTL Process.
机构信息
Renewable Energy Consortium for R&D (RE-CORD) Viale J. F. Kennedy, 182, 50038 Scarperia e San Piero, Italy.
Department of Chemistry "Ugo Schiff", University of Florence, Via della Lastruccia, 3-13, 50019 Sesto Fiorentino, Italy.
出版信息
Molecules. 2022 Oct 21;27(20):7112. doi: 10.3390/molecules27207112.
In this study, we investigate the hydrothermal liquefaction (HTL) of PET separated from a densified postconsumer plastic mix, with the aim of recovering its monomer. This second raw material is made up of 90% polyolefin, while the remaining 10% is made up of PET, traces of metals, paper, and glass. After preliminary separation by density in water, two batch experiments were performed on the sunken fraction (composed mainly of PET) in a stainless steel autoclave at 345 °C for 30 and 20 min. Both trials resulted in similar yields of the three phases. In particular, the solid yield is around 76% by weight. After a purification step, this phase was analyzed by UV-Vis, H-NMR, and FTIR spectroscopy and resulted to be constituted by terephthalic acid (TPA), a product of considerable industrial interest. The study proved that the hydrothermal liquefaction process coupled with density separation in water is effective for obtaining TPA from a densified postconsumer plastic mix, which can be used for new PET synthesis.
在这项研究中，我们研究了从致密化消费后塑料混合物中分离出的聚对苯二甲酸乙二醇酯（PET）的水热液化（HTL），旨在回收其单体。这种第二原料由 90%的聚烯烃组成，其余 10%由 PET、微量金属、纸张和玻璃组成。在用水进行初步密度分离后，在不锈钢高压釜中对下沉部分（主要由 PET 组成）进行了两次间歇实验，温度为 345°C，时间分别为 30 分钟和 20 分钟。两次试验的三相产率相似。特别是，固体产率约为 76%（按重量计）。经过纯化步骤后，通过 UV-Vis、H-NMR 和 FTIR 光谱对该相进行了分析，结果表明该相由对苯二甲酸（TPA）组成，这是一种具有相当工业价值的产品。该研究证明，水热液化工艺与水的密度分离相结合，可有效地从致密化消费后塑料混合物中获得 TPA，可用于新的 PET 合成。
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