Stability study for biodiesel produced by pyrolysis of polyethylene and analysis of antioxidant's performance

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Thesis : Stability study for biodiesel produced by pyrolysis of polyethylene and analysis of antioxidant's performance

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[...] The general objective of this report is the study of the storage stability of biodiesel produced from pyrolysis reaction of plastic feedstock (high density polyethylene). Moreover, the specifics objectives are: the chemical characterization of the fuel during midterm storage, identification of chemical transformation taking place during degradation process, and the performance antioxidants for increasing stability of biofuel. COMPANY AND LABORATORY DESCRIPTION The internship host, Environmental Engineering & Energy Systems department (DSEE) of Ecole des Mines de Nantes is composed of two teams "Energy Engineering" and "Environmental Engineering" completely included in the GEPEA laboratory. [...]

[...] The main products obtained by this reaction are liquid, solid and gaseous products. The conversion rate of each product will be highly dependent on the reaction conditions; such as temperature, feeding reactant (type of polymers or mixture of polymer and vacuum gas oil), pressure, used of catalyst, and others (Williams, et al. 1998). NON CATALYTIC- THERMAL CRACKING Several studies have been worked at temperature condition between 400-500°C for the cracking process to occur, demonstrating that by increasing the temperature or decreasing the pressure of the pyrolysis reaction will increase the yield of gaseous products. [...]

[...] 1999) These cracking mechanisms can form short chain hydrocarbons that are volatile and which can pass to the gas phase. The rate of the end-chain scission is proportional to the number of molecules. It is also important to mention the effect of temperature in the cracking mechanisms; higher cracking temperatures will lead to a different composition and a higher yield of gaseous compound, as well as light liquid ones. (Zhibo, et al. 2004) Main reaction mechanism in the depolymerization of plastics In general, in the process of depolymerization of plastic waste, there are present two main reaction mechanisms related to the cracking process of these polymers, which are random scission mechanism and chain-end scission (Williams, et al. [...]

[...] Leeds, UK: Department of Fuel and Energy, The University of Leeds. Ballice, L., Yoksel, M., Sajlam, M., & Reimert, R. (1998). Classification of volatile products evolved during temperature programmed co-pyrolysis of Turkish oil shales with low density polyethylene. Izmir, Turkey: University of Ege. Banavali, R., & Chheda, B. (2001). Chemical basis of diesel fuel stabilization by tertiary alkyl primary amines. Texas, United State: Rohm and Haas Company. Bondioli, P., Gasparoli, A., Lanzani, A., Fedeli, E., Veronese, S., & Sala, M. [...]

[...] Arandes, J. M., & Azkoiti, M. J. (2003). Valorization by thermal cracking over silica of polyolefins dissolved in LCO. Managua, Nicaragua: Universidad Nacional de Ingenieria. Bagri, R., & Williams, P. T. (2001). Catalytic pyrolysis of polyethylene. [...]