Pyrolysis of composite packaging wastes and obtaining carbon nanotube from gas product

In this thesis, based on the necessity of evaluating composite packaging wastes from both environmental and economic point of view, in addition to obtaining carbon nanotubes (CNT) from the pyrolysis gas product of this material by the catalytic chemical vapor deposition method (CCVD), it was also aimed to recover wax from the liquid product and aluminum from the solid product. In the first stage, C/LDPE packaging waste were pyrolyzed at heating rates of 5, 10, and 20℃/min and at temperatures of 400, 500, and 600℃. For the catalytic pyrolysis process, the same procedure was repeated by adding 5, 10, and 15 wt% zeolites to the analytical samples, respectively, under conditions where the highest gas product yield was obtained. The effects of heating rate, temperature and catalyst amount on pyrolysis product distribution were determined. In the second stage, the aluminum content of the solid product was determined, and the chemical and physical properties of liquid products were determined and compared with commercial waxes. The gas chromatography analysis was performed and the composition of the gas was determined. In the third stage, CNT production studies were carried out by CCVD method in a tubular reactor at four different temperatures between 600-900℃, with iron and nickel catalyst, from the gas product formed during the pyrolysis at the determined optimum conditions. The effects of catalyst type, temperature, and carbon source feeding rate on the properties of the obtained CNTs were investigated. CNTs produced in the thesis were compared with a commercial product. As a result; aluminum from solid product and wax from liquid product were recovered by pyrolysis of C/LDPE waste at 600°C with 20℃/min heating rate. High quality multi-walled carbon nanotubes of 20-30 nm diameter and micrometer length comparable to commercial products were produced from the gaseous product at 800°C under Ni-catalysis.