【摘要】 废弃高分子材料的处置已经成为环境污染治理的一个重要问题。本文研究了废聚苯乙烯在氯化稀土、硝酸铈和复合催化剂等催化剂存在下的裂解情况。通过气相色谱分析可知,裂解产物为苯、甲苯、苯乙烯和乙苯。结果表明,催化剂的活性顺序为:复合催化剂>氯化稀土>硝酸铈。当复合催化剂用量为0.75％,在390℃,常压条件下裂解30min,裂解产率为89.5％,裂解产物苯乙烯单体含量为97.4％。粗产物经简单蒸馏,苯乙烯的总回收率为84.5％,苯乙烯单体纯度可达99.9％以上。更多还原

【Abstract】 The disposal of polymer wastes has become the main subject for treatment of environmental pollution. In this paper, the process of the thermal pyrolysis of waste polystyrene (WPS) was studied of with catalysts in existence such as cerous nitrate, composite catalyst and rare earth chloride etc., and the pyrolytic products of WPS were benzene, methylbenzene, styrene and ethyl benzene which were identified by GC. The results show the order of catalytic effects as follows: composite catalyst > rare earth chloride > cerous nitrate. The optimum condition of the degradation over composite catalyst was also studied. The yields of pyrolytic products and styrene content were 89.5% and 97.4% respectively under the degradation condition for 30 min at 390℃, under atm, and catalyst content 0.75%. The output of styrene monomer was 84.5% and its purity was above 99.9% through simple distillation.更多还原