Study On Resource Utilization Of PVC Full Components In A Fluidized Bed Pyrolysis

The plastics was synthetic with raw material of natural resources such as oil, gas, coal etc. In recent years, making full use of waste plastics and producing oil attracts more and more attention. In this work, the liquid fuel was prepared from PVC by pyrolysis method, then, optimization of reaction parameters and co-blend of biomass and PVC were also considered.Firstly, PVC and quartz sand were separated in different mesh (40-60mesh and120～200mesh for PVC,40-60mesh for quartz sand), the experiment was carried out in a glass reactor under atmospheric pressure in order to obtain the actual minimum flow rate. The optimum operating conditions were determined by cold test. The theoretic minimum fl uidization velocity was40.4%～53.5%,13.0%～18.3%and33.1%～52.1%of the actual mini mum flow rate for PVC (40-60mesh), PVC (120-200mesh) and quartz sand, respectively. The mixed-index was increased with the decreasing of PVC concentration, which was benefit for the mixing of PVC and quartz sand Secondly, The effect dechlorination tempera ture and the pyrolysis temperature on PVC pyrolysis was studied.The measurement method of chlorine concentration was identified,the result showed that PVC concentration,dechlorn ation temperature and pyrolysis temperature had significant affect in PVC pyrolysis process.The optimum temperature of PVC dechlorination was280℃, and the optimum temperatur e range of PVC liquefied was360℃～500℃. The average concentration of chlorine nin the pyrolysis oil was0.48%, which was determined rapidly and accurately by Oxygen bomb combustion method.Thirdly, the effect of different catalysts on liquid products was studied as well as on different biomass for oil yield. The results showed that the co-liquefaction of PVC and biomass has higher oil production ability than the mixture of liquefaction PVC and liquefaction biomass. Additionally, the oil yield increased and following decreased with the increasing of PVC concentration, which reached the maximum(43%) at the60%(v/v) PVC, Pyrolysis temperature of500℃, carrier gas flow rate of1.2m3/h. Then, the as-prepared pyrolysis oil was analyzed by gas chromatography-mass spectrometry (GC-MS)which supplied the basic data for the industrial production of pyrolysis liquid fuel from PVC.