We examined the hydrolysis of polyethylene terephthalate (PET) with added polypropylene or cellulose and measured the yield of the terephthalic acid (TPA) monomer recovered. The TPA yield from hydrolysis at 250 °C for 30 min nearly doubled from 40 to 75% with the addition of polypropylene (PP). It increased to 55% with the addition of cellulose. There were no statistically significant increases in TPA yield from hydrolysis with the added plastic or biomass at 300 or 350 °C. The solid material recovered from the hydrolytic depolymerization, after first recovering water- and dichloromethane-soluble compounds, was largely TPA, and the amounts of the other reaction products present with it were largely the same irrespective of the presence or absence of PP or cellulose in the reactor. The TPA yield was affected strongly by the reaction time, reaction temperature, and PET type (fiber-reinforced pellet vs chips from a water bottle). The addition of PP or cellulose to the reactor reduces the influence of reaction time on TPA yield from PET hydrolysis.

中文翻译：

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纤维素和聚丙烯对聚对苯二甲酸乙二醇酯水解化学回收的影响

我们检查了添加聚丙烯或纤维素的聚对苯二甲酸乙二醇酯 (PET) 的水解，并测量了回收的对苯二甲酸 (TPA) 单体的产率。添加聚丙烯 (PP) 后，在 250 °C 下水解 30 分钟，TPA 产率几乎翻了一番，从 40% 增加到 75%。随着纤维素的添加，它增加到 55%。在 300 或 350 °C 下添加塑料或生物质后，水解产生的 TPA 产量在统计学上没有显着增加。从水解解聚中回收的固体物质，在首先回收水溶性和二氯甲烷溶性化合物之后，主要是 TPA，并且与它一起存在的其他反应产物的量基本相同，无论是否存在 PP 或纤维素反应堆。TPA 产率受反应时间的强烈影响，反应温度和 PET 类型（纤维增强颗粒与水瓶碎片）。向反应器中添加 PP 或纤维素可降低反应时间对 PET 水解产生的 TPA 产率的影响。