CATALYTIC CRACKING AND DEHYDROCHLORINATION OF POLYPROPYLENE / POLYVINYL CHLORIDE USING MgO COMPOSITES
1. IntroductionRecycling of waste plastics is of great interest due to the serious environmental problems caused by waste plastics. Among the various methods of resource recovery, polymer pyrolysis, aiming to degrade waste plastics to fuel oil or valuable chemicals for a variety of downstream processes, is the most promising technology for resource recovery from waste polymer materials. However, polyvinylchloride (PVC) in waste plastics will cause corrosion problems and a contamination of all product streams with chlorinated organics during pyrolysis. Therefore the dehydrochlorination of waste plastics is a must for this reaction. Different sorbents for dehydrochlorination were investigated, and among these sorbents, alkaline earth oxides such as MgO attracted significant attention as effective dehydrochlorination catalysts and chemsorbents. However, they are far from the requirement of realizing commercial use of this process due to the limited dehydrochlorination degree and fast deactivation of the catalysts caused by large amounts of HC1 produced during the reaction. On the other hand, lowering pyrolysis temperature and increasing pyrolysis rate, which will decrease energy consumption of this process, are also very necessary for this reaction. In this paper a lanthanum modified MgO catalyst, La-MgO, and carbon-coated nano-MgO have been developed with both dehydrochlorination and catalytic cracking ability, which will be very useful in the recycling of chloride-containing waste plastics.
Qian Zhou Yu-Zhong Wang
Center for Degradable and Flame-Retardant Polymeric Materials (ERCEPM-MoE), College of Chemistry, State Key Laboratory of Polymer Materials Engineering, Sichuan University,Chengdu 610064,China
国际会议
成都
英文
26-28
2009-10-11（万方平台首次上网日期，不代表论文的发表时间）