Thermal and Catalytic Degradation of Polystyrene with a Novel Catalyst

Waste polymer recycling has received a great attention due to increasing amounts of waste polymers generate enormous environmental problems. The pyrolysis of polystyrene was examined as an effective way to recycle this polymer and recover its monomer styrene. In this paper, thermal and catalytic degradation of polystyrene at the atmospheric pressure was investigated. Various conditions of temperature and catalyst/Polystyrene mass ratio were considered to determine the product composition and effects of catalyst/ Polystyrene mass ratio and temperature on conversion. The results showed that with increasing the temperature, the conversion increased. The products of the degradation mostly consist of liquid, less gas and solid residue. The AIT100s catalyst showed good catalytic performance for the degradation of PS with selectivity to aromatics more than 99%. Keywords Catalytic degradation, polystyrene, monomer, AIT100

Experimental Studies of CO2 Capturing from the Flue Gases

CO2 emissions from combustion flue gases have turned into a major factor in global warming. Post-combustion carbon capture (PCC) from industrial utility flue gases by reactive absorption can substantially reduce the emissions of the greenhouse gas CO2. To test a new solvent (AIT600) for this purpose, a small pilot plant was used. This paper presents the results of studies on chemical methods of absorbing CO2 from flue gases with the new solvent, and evaluates the effects of operating conditions on CO2 absorption efficiency. CO2 removal rate of the AIT600 solvent was higher in comparison to the conventional monoethanolamine (MEA) solvent. The optimized temperature of the absorber column was 60 °C for CO2 absorption in this pilot plant. The overall absorption rate (Φ) and the volumetric overall mass transfer coefficient (KGaV) were also investigated

Investigation of Catalytic Degradation of Polyolefins in Presence of Polyvinylchloride via Design of Experiments

The aim of this study is the determination and investigation of the effective factors (temperature, catalyst percentage and PVC composition) on pyrolysis a mixture of main polyolefins in present of polyvinyl chloride by a new catalyst based on Alumina. Three main types of polyolefins (high-density polyethylene density polyethylene, low density polyethylene, polypropylene) in present of polyvinylchloride chosen as the sample and the pyrolysis carried out in the semi-batch reactor withambientatmosphericconditions. Factorial design employed as the design of experiments method. The analysis of variance for the results showed that the main effects are significant. But some interaction was not significant