Abstract :
Pyrolysis with or without the aid of catalyst have attracted much attention for the conversion of waste plastics to their monomers or partially de-polymerized oligomers. The resulting monomers can be recycled to the original or related polymeric product as well as gasoline range products. In this work, the pyrolysis of contaminated Low Density Polyethylene (LDPE) was done both thermally and catalytically. The gases from each sample were collected in Tedlar bags and analysis was done using a Buck 530 Gas chromatograph. Results from the thermal pyrolysis showed aliphatic hydrocarbons within the range of C1 – C9 with a total concentration of 36.0906 ppm and 64.5041 ppm for gases collected at 200 ºC and 350 ºC respectively. The pyrolysis was also repeated under the influence of zeolite catalyst using catalyst/sample ratios of 1:8 and 1:16 at 150 ºC and 250 ºC. Results revealed total yield of gases for LDPE under the zeolitic effect of temperatures of 150 ºC and 250 ºC using catalyst/sample ratio of 1:8 to be 721.0371 ppm and 835.0906 ppm. The corresponding values obtained at 150 ºC and 250 ºC using catalyst/sample ratio of 1:16 were 697.4464 ppm and 713.7277 ppm respectively. The hydrocarbon gases revealed mainly C1– C10 aliphatic hydrocarbons. These when fractionated can result into combustible gases and gasoline range product.
Keywords :
combustible gases, low density polyethylene, Pyrolysis, zeolite.References :
- Almeida, D. and Marques, M. F. (2015). Thermal and Catalytic Pyrolysis of Waste. Polimerus 26 (1) Pp. 8. http://dx.doi.org/10.1590/0104 – 2100.
- Abbas – Abad, M. S., Haghighi, M. N. and Yeganeh, H. (2012). The effect of temperature, catalyst, different carrier gases and stirrer on the produced transportation hydrocarbons of LLDPE degradation in a stirred reactor. Journal of Analytic and Applied Pyrolysis, 95, Pp 198 – 204. http://dx.doi.org/10.1016/j.jaap.2012.02.007.
- Arabiourrutia, M., Elordi, G; Lopez, G., Borsella, E., Bilbao, J., and Olabor, M. (2012). Characterization of the waxes obtained by the pyrolysis of polyolefin plastics in a conical spouted bed reactor. Journal of Analytic and Applied Pyrolysis, 94, Pp 230 – 237. http://dx.doi.org/10.1016/j.jaap.2011.12.012.
- Abbas – Abadi, M.S., Haghighi, M. N. and Yeganeh, H. (2013). Evaluation of pyrolysis products of virgin high density polyethylene degradation using different process parameters in a stirred reactor. Fuel Processing Technology, 109, Pp 90 – 95. http://dx.doi:org/w.1016/j.fuproc.2012.09.042.
- Mohammed, N. S., and Halim, H. R. (2009). Catalytic coprocessing of waste plastic and petroleum residue into liquid fuel oils. Journal of Analytical and Applied Pyrolysis, 86: Pp 141 – 142.
- Miskolezi, N. and Nagy, R. (2012). Hydrocarbons obtained by waste plastic pyrolysis: Comparative analysis of decomposition described by different kinetic models. Fuel Processing and Technology. 104, Pp 95 – 104.
- Singh, N., Hui, D. Singh, R., Ahija, I., Feo, I. Frantenal, F., (2017) Recycling of Plastic Solid Waste: A State of the act review and Future Apllication. Compos Part B Eng 115: 409-422
- Surma, N. Ijuo, G. A., Yusuf, E. Y. and Iorhemba, M. A. (2020) Terciary recycling of waste polyethylene to fuel gases via low temperature catalytic pyrolysis. Journal of research in chemistry 1(1): 42-47
- Francis, R. Recycling of polymers; Methods, Characterization and Application. (2016) John Wiley and Sons, Hoboken, N. J. USA
- Olah G. A., Geoppert, A. Prakash, G. S., . Chemical Recycling of carbondioxide to Methanol and Dimrthylether; from greenhouse gas to renewable environmentally Carbon neutral Fuels and synthetic hydrocarbons(2008) . J. org chem. 74: 478-498
- Achillas, D.S. roupakias, C., Megalonomos, p., Lappas A. A., Antinakov, E.V., (2007) Chemical Recycling of Plastic Waste made from Polyethylene (LDPE, and HDPE and PP) J Harzard Mater149:539-542.
- Surma, N., Tor, P. N. and Ijuo, G. A. (2018) Low temperature catalytic pyrolysis of polyethylene terepthalate. International Journal of Research in Chemical Science 5(5): 20-25
- Schiers and Kaminsky (2006) Feedstock recycling and pyrolysis of Waste Plastics, Converting waste plastics to diesel and other fuels. John Wiley and Sons limited 1-5, [14] Hwang, W. C., Huang, M. S. Huang, C. F. Chen, C. C. and Ou, K. L. (2010 Thermochemical Conversion of polymer wastes into hydrocarbon fuels over various fluidizing cracking catalyst. Fuels 89(9): 2305-2316
- Panda, A. K., Singh, R. K. and Mishra, D. K. (2010). Thermolysis of waste plastics to liquid fuels. A suitable method for plastic of value added products: a world perspective. Renewable and Sustainable Energy Reviews. 14(1) Pp 233 – 248. htt://dx.doi.org/10.1016/j.rser.2009.07.007.
- Hwang, W. C., Huang, M. S. Huang, C. F. Chen, C. C. and Ou, K. L. (2010 Thermochemical Conversion of polymer wastes into hydrocarbon fuels over various fluidizing cracking catalyst. Fuels 89(9): 23052316
- Nwadinigwe, C. A., Surma, N., Alumona, T. N., Ezeofor, C.C., Lawal, A. M. (2018) Urban Mining of Fuel Gases via Low Temperature Pyrolysis of Post-Consumer High Density Polyethylene Waste. J. Appl. Sci. Environ. Manage 22(6): 946-948
- Smith, J. M. (1993) Chemical Engineering Kinetics 2nd Edition Mcgraw Hill Kogakushha Ltd. 5-30
- Abdulkareem, S. A .; Eleburuike, N. A.; & Amoleye, T. O. (2014) Comparism of fuel oil from Thermal cracking and catalytic cracking of high density polyethylene. J. Chem SOC. Nigeria 39(1): Pp. 103-106.
- Ademiluyi, T., and Adebayo, T. A., (2007) Fuel Gases from pyrolysis of Polyethylene Sachets. J. Appl. Sci. Environ Manage. 11: 21-26
- Nguamo, S. Ijuo, G. A., Oloruntoba, S. O. (2020) Combustible Gases from Low Density Catalytic Pyrolysis. Chemical Research Journal 5(6): 172-179
- Nwadinigwe, C. A. Basic Principles of Organics Chemistry (2012). WIPRO International. Pp 101
- Borsidi, N., Misklolczi, N., Angyal, A., Bartha, L., Kohan, J and Lengyel, A. (2011) Hydrocarbons obtained by Pyrolysis of Contaminated waste plastics. 4 th International Petroluem Conference. Bratrsslava Republic. Pp 1-9
- Demibras, A., and Ahyam, J. (2004) Pyrolysis of Municipal Plastic Waste for Recovery of Gasoline range hydrocarbons. Journal of Analytical and Applied Pyrolysis 72: Pp 92-102.
- Murata, K.; Sato, K. & Sakata, Y. (2004) Effect of Pressure on Thermal Degradation of Polyethylene. Polymer Degradation and Stability, 72(2): pp. 59.
- Okhita, H.; Nishiyama, R.; Kakuta, N.; Monota, Y. Ueno, A.; Nanuki, Y. & Tamifuji, S. (1993) Acid Properties of Silica – Alumina catalysts and Catalytic Degradation of Polyethylene. Industrial and Engineering Chemistry. Research, 32 (12): pp. 342 – 3116.
- Lin, H. T., Huang, M. S., Luo, J. W., Lin, L.H., Lee, C. M. and Oy, K. L. (2010). Hydrocarbon fuels produced by catalytic pyrolysis of his plastic wastes in a fluidizing cracking process. Fuel Processing and Technology, 91 (11) Pp 1355 – 1363. http://dx.doi:/org/10.1016/j.fuproc.2010.03.016
- Gobin, K., and Manos, G. (2004) Thermogravi-metric Study of Polymer. Catalysis Degradation over Microporous Materials. Polymer Degradation and Stability 86 (2): Pp225
- Aguado, J.; Serrano, D.P. and Gomez, A. (2001) Influence of the operating variables on the catalytic conversion of polyolefin mixture over HCM-41 and a Nano sized HZSM-5. Industrial and Engineering Chemistry Research 40 (24). Pp 5659-5704.
- Surma, N. Ijuo, G. A. and Agbende, Z. M. (2020) Recovery of Combustible Gases from Waste Polyethylene via low Temperature Catalytic Pyrolysis 1(1): 36-41
- Akpanudoh, N.S.; Gobin, K. & Manos, G. (2005) Catalytic degradation of waste to liquid fuel over commercial cracking catalyst: Effect of polymer to catalyst ratio/acidity content. Journal of Molecular catalysis A: Chemical 235 (1-23) p. 67

