超临界水降解聚丙烯机理及产物研究

Study on degradation mechanism and products of polypropylene in supercritical water

采用间歇式管式反应器进行了超临界水降解聚丙烯实验,对降解产物分别进行了GC-MS检测分析,研究了聚丙烯在超临界水中的降解机理及产物分布。结果表明,采用超临界水可将聚丙烯塑料彻底降解为液态油状物和可燃性气体。芳香烃类化合物和甲烷分别为液态油状物和气相产物中的主要组分;水相中存在少量醇类和酚类物质。聚丙烯在超临界水中的降解是通过自由基反应进行的,链引发主要由.OH自由基完成。

Polypropylene was degraded in supercritical water by a batch tubular reactor. The degradation products of polypropylene were analyzed and identified systematically by GC - MS. The degradation mechanism and products of polypropylene in supercritical water were investigated. The results showed that the polypropylene can be degraded to oily products and combustible gas effectively in supercritical water. The aromatic and methane were the main components in oily products and combustible gas, respectively. The kinds of mellow and hydroxy- benzene were found in water. The free radical reaction was the character of supercritical water processes for poly- propylene degradation and free radicals·OH began the reactions.