超临界甲醇解聚PET的应用研究  

The applocation and research on supercritical methy alcohol depolymerizing PET

作　　者：高菲[1] 邢存章[1] 

机构地区：[1]山东轻工业学院化学工程学院,山东济南250100

出　　处：《山东轻工业学院学报（自然科学版）》2006年第1期14-19,共6页Journal of Shandong Polytechnic University

摘　　要：本文介绍了超临界流体的基本性质及其在废旧塑料化学循环回收中的应用，研究了废弃聚对苯二甲酸乙二醇酯（PET）在超临界甲醇中的解聚反应，产物用液相色谱、气相色谱和红外光谱进行了分析。结果表明，在温度3．50℃压力，16．8—17．0MPa，反应时间60min以及甲酵／PET质量比为8的条件下，PET的转化率在90％以上，聚解聚产物主要为对苯二甲酸二甲酯（DMT）、乙二醇（EG）以及少量的MHET、BHET、二聚物以及低聚物。实验建立了相应的分析方法，证实了超临界流体在废旧塑料分解上的利用，为其资源化再利用指明了一条新途径。The paper represents the basic characteristic of supereritical fluids and its application of chemical recycling of waste plastic. The depelymerization of waste PET by supereritical methanol is studied by using a stainless stirred aotuclave at temperature of 350℃, pressure of 16.8 ～ 17.0MPa, reaction time of 60min and methanol/PET weight ratio of 8. The FT - IR spectrometry. The main products of the reaction are dimethyl terephthalate and ethylene glycol. There are still some small amounts of byproducts, such as methyl - （ 2 - hydroxyethyl ） tetephthalate, bis （ hydroxyethyl ） terephthalate, dimmers and oligomers. At last it summarizes the depolymerization of PET by supercritical fluids and the recycle of the material. It confirms the use of the depolymerization of PET by supemritical fluids and points out a new way of the reuse of the plastic.

关 键 词：超临界流体 PET 解聚 甲醇 化学循环 

分 类 号：O632.426.2[理学—高分子化学]