响应面法优化苯甲酸钛高效降解废旧PET
温瑞阳，沈国良，孟令慧，韩垚杰，周超，于洋，霍悦，徐世洁，卫杰
沈阳工业大学石油化工学院，辽宁辽阳 111003
Optimization of Titanium Benzoate for Efficient Degradation of Waste PET by Response Surface Methodology
Wen Ruiyang, Shen Guoliang, Meng Linghui, Han Yaojie, Zhou Chao, Yu Yang, Huo Yue, Xu Shijie, Wei Jie
School of Petrochemical Engineering,Shenyang University of Technology,Liaoyang 111003,China
摘要：聚对苯二甲酸乙二酯(PET)是一种基于石油基衍生的具有良好性能的聚酯塑料，应用极为广泛，但其良好的稳定性导致其废弃后在自然界中难以降解，而回收 PET 目前最有效的方式是化学回收。笔者以钛酸酯和苯甲酸为原料，采用一锅法制备了苯甲酸钛催化剂，并用于催化乙二醇降解聚废旧 PET 的反应中，以醇解反应得到的对苯二甲酸双羟基乙酯(BHET)的收率为指标，探究了溶剂用量 、催化剂用量和反应温度对收率的影响，并选用 Box-Behnken 设计响应面分析法探究了单因素间的交互作用对 BHET 收率的影响，对制得的催化剂及其解聚产物 BHET 进行相关的表征。结果表明：催化剂颗粒尺寸均匀 ，在解聚反应中有良好的催化性能，通过傅里叶变换红外光谱仪和差示扫描量热仪分析确定产物为 BHET。在废旧 PET 用量为 5 g、乙二醇溶剂质量为 25 g、催化剂用量为 PET 质量的 2.9%、反应温度为 220 ℃、反应时间 3 h 的条件下，得到的 BHET 收率为 87.2%。根据实验结果分析了醇解 PET 的反应机理，为高分子废弃物的降解及其他酯交换反应提供一定的参考。
Abstract：Polyethylene glycol terephthalate (PET) is a polyester plastic with good properties based on petroleum-based derivatives and is used in a wide range of applications. Its good stability makes it difficult to degrade in nature after disposa, and chemical recycling of PET is currently the most effective way to recover it. In this paper, titanium benzoate catalysts were prepared by a onepot method using titanate and benzoic acid as raw materials and used in the reaction to catalyze the degradation of poly-waste PET by ethylene glycol. The effect of solvent dosage, catalyst dosage, and reaction temperature on the yield of bis-hydroxyethyl terephthalate (BHET) obtained from the alcoholysis reaction was investigated, and the Box-Behnken design response surface analysis was chosen to investigate the effect of single-factor inter. The effect of interaction between single factors on the yield of BHET was investigated by Box-Behnken design response surface analysis. The prepared catalyst and its depolymerization product BHET were characterized. The results show that the catalyst particle size is uniform and has good catalytic performance in the depolymerization reaction. The product is determined to be BHET by Fourier Transform Infrared Spectrometer and Differential Scanning Calorimeter analysis. When the waste PET quality is 5 g, the amount of glycol solvent is 25 g, the amount of catalyst is 2.9% of PET mass, the reaction temperature is 220 ℃, and the reaction time is 3 h, the yield of BHET is 87.2%. The reaction mechanism of alcoholysis of PET was analyzed according to the experimental results, which can provide some reference for the degradation of polymer waste and other ester exchange reactions.
关键词：一锅法；对苯二甲酸双羟基乙酯；废旧聚对苯二甲酸乙二酯；响应面法；乙二醇
Keywords：one pot method; bis-hydroxyethyl terephthalate; waste polyethylene glycol terephthalate; response surfacemethod; glycol
本文引用格式：
温瑞阳，沈国良，孟令慧，等.响应面法优化苯甲酸钛高效降解废旧PET[J].工程塑料应用，2023，51(8)：72-77.
Wen Ruiyang，Shen Guoliang，Meng Linghui，et al. Optimization of titanium benzoate for efficient degradation of waste PET by responsesurface methodology[J]. Engineering Plastics Application，2023，51(8)：72-77.
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