液相氧化降解聚乙烯和聚丙烯的研究

Research on liquid oxidative degradation of polyethylene and polypropylene

研究了废旧聚乙烯(PE)和聚丙烯(PP)塑料高温液相催化氧化降解的工艺条件。以醋酸为溶剂,醋酸钴、醋酸锰为主催化剂,溴化物为助催化剂,在一定温度和压力下用空气氧化聚乙烯和聚丙烯,用气质联用法(GC-MS)检测了聚乙烯和聚丙烯氧化降解后的产物成分,尾气中CO和CO2浓度则采用红外在线分析仪检测。结果表明,在降解PE、PP过程中,MC催化体系表现出较高的催化活性,PE和PP降解主要产物为草酸和醋酸。

The oxidation of waste PE and PP were researched via a high temperature liquidphase process. By using acetic acid as solvent, acetate cobalt and acetate manganese as main catalyst and bromine hydride as co-catalyst, acetate acid and adipic acid were obtained by air oxidation of PE and PP at stated reaction temperature and pressure, the products of oxidative degradation was detected by GC-MS, co and co2 in the exhaust gas concentration using on-line analyzer infrared detection. The results show that MC catalyst system demonstrated high catalytic activity in the degradation process of PE and PP; the major degradation products of PE and PP are oxalic acid and acetic acid, respectively.