PP和PVC混合塑料的降解及脱氯研究

对聚丙烯(PP)和聚氯乙烯(PVC)混合物在380 ℃下的热降解进行了研究。检测了PP和PVC混合塑料降解液体产物的沸点分布，并用铁氧化物作为固体吸附剂以除去产品中的氯元素。同时还研究了该混合物在ZSM-5催化剂存在下的降解，与热降解相比，ZSM-5催化剂加快了降解的速率，并且降低了液体产品的沸点。铁氧化物α-FeOOH和Fe3O4则能有效地降低产品中的氯含量。

THERMAL AND CATALITIC DEGRADATION OF PP/PVC MIXTURE AND DECHLORINATION OF THE DERIVED OIL

The thermal degradation of PP/PVC mixture at 380 ℃ was carried out in a glass batch reactor under atmospheric pressure. The boiling-point (bp) distributions of degradation products and its chlorine removal were examined. The catalytic thermal degradation of the plastic mixture was also carried out with ZSM-5 as catalyst and iron oxides (α-FeOOH, Fe2O3, Fe3O4) as chlorine sorbents. Compared with thermal degradation, the ZSM-5 catalyst accelerated the rate of degradation, increased the weight percent of lower molecular weight component, and lowered the bp of the liquid products. As a dechlorination sorbent, α-FeOOH can significantly decrease the chlorine content in the oil from 1.65w% to 0.63w%. When α-FeOOH /ZSM-5 is used in vapor phase, the organic chlorine content can decrease to 0.13w%. Fe3O4 also possesses the ability of dechlorination. It is the crystalline structure of Fe3O4 that is very efficient for dechlorination.