Pyrolysis Kinetics of Polypropylene and High Density Polyethylene Wastes Using Kaolin Catalyst

Abstract:

Plastic is materials that are not easily broken down, so it can cause a variety of complex problems such as loss of natural resources, environmental pollution, and depletion of landfill space. Plastic favored by the public is Polypropylene (PP) and High Density Polyethylene (HDPE) for example, food storage, transparent drinking glasses and drinking bottles for babies. This will be a problem in the future. Some alternatives used to reduce the volume of plastic waste are the thermal transformation process which is divided into three types of processing, namely combustion, gasification, and pyrolysis. Pyrolysis is a process of thermal degradation of long chains into smaller molecules. The process of pyrolysis in this study used a variety of catalysts (without catalyst, 5%, 10%, 15%, and 20%) and used variations in particle size, namely size I (30 cm³); size II (7.5 cm³); size III (1,875 cm³) weighing 350 grams of plastic cups and 350 grams of bottle caps. Pyrolysis run for 100 minutes and took the result of pyrolysis every 20 minutes interval. The test carried out by using proximate analysis, fuel specification analysis, and GC-MS. Based on the result of research conducted on the pyrolysis process of a mixture of HDPE and PP variations of catalysts, it obtained optimum liquid and gas yields of 98.57% and 1.43%. Besides, in the size variation, the optimum liquid and gas yield was 96.57% and 3.43%. The proximate result has fulfilled the conditions set by the value of ash content, fly substance, and carbon bound 0.15%; 99.57%; 0.28%. In the GC-MS (Gas Chromatography-Mass Spectrometry) test the highest % area was 39.18% with C₉H₁₈ or 2,4-dimethyl-1-heptane compounds. The best simulation result obtained the value of activation energy and reaction speed for liquid and gas in the variation of the catalyst of (87,930.07; 101,527.17) J/mol and (2.03 x 10²; 3.74 x 10³).

• Periodical: Materials Science Forum (Volume 998)
• Pages: 114-119
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.998.114
• Online since: June 2020
• Authors: Emi Erawati*, Hamid Hamid, Rosyad Adrian Febriansyar
• Keywords: High-Density Polyethylene, Kaolin, Kinetics, Polypropylene, Pyrolysis

References

[1] Kassargy, C., Awad, S., Burnens, G., Kahine, K., & Tazerout, M. (2018). Gasoline and Diesel-Like Fuel Production by Vontinuous Catalytic Pyrolysis of Waste Polyethylene and Polypropylene Mixtures Over USY Zeolite. Fuel, 224(November 2017), 764–773. https://doi.org/10.1016/j.fuel.2018.03.113.

DOI: 10.1016/j.fuel.2018.03.113

[2] Khan, M. Z. H., Sultana, M., Al-Mamun, M. R., & Hasan, M. R. (2016). Pyrolytic Waste Plastic Oil and Its Diesel Blend: Fuel Characterization. Journal of Environmental and Public Health, 2016. https://doi.org/10.1155/2016/7869080.

DOI: 10.1155/2016/7869080

[3] Sriningsih, W., Saerodji, M. G., Trisunaryanti, W., Triyono, Armunanto, R., & Falah, I. I. (2014). Fuel Production from LDPE Plastic Waste over Natural Zeolite Supported Ni, Ni-Mo, Co and Co-Mo Metals. Procedia Environmental Sciences, 20, 215–224. https://doi.org/10.1016/j.proenv.2014.03.028.

DOI: 10.1016/j.proenv.2014.03.028

[4] Sharuddin, S. D. A., Daud, W. M. A. W., & Aroua, M. K. (2016). A review on pyrolysis of plastic wastes. Energy Conversion and Management, 115, 308–326. https://doi.org/10.1016/j.enconman.2016.02.037.

DOI: 10.1016/j.enconman.2016.02.037

[5] Santos, B. P. S., Almeida, D. D., Marques, M. de F. V., & Henriques, C. A. (2019). Degradation of Polypropylene and Polyethylene Wastes Over HZSM-5 and USY Zeolites. Catalysis Letters, 149(3), 798–812. https://doi.org/10.1007/s10562-019-02677-y.

DOI: 10.1007/s10562-019-02677-y

[6] Suhanya, M., Thirumarimurugan, M., & Kannadasan, T. (2013). Recovery of Oil From Waste Tyres Using Pyrolysis Method: a Review. International Journal of Research in Engineering & Technology (IJRET), 1(2), 81–90.

[7] Koufopanos, C. A., Lucchesi, A., & Maschio, G. (1989). Kinetic modelling of the pyrolysis of biomass and biomass components. The Canadian Journal of Chemical Engineering, 67(1), 75–84. https://doi.org/10.1002/cjce.5450670111.

DOI: 10.1002/cjce.5450670111

[8] Ahmad, I., Ismail Khan, M., Ishaq, M., Khan, H., Gul, K., Ahmad, W., 2013. Catalytic efficiency of some novel nanostructured heterogeneous solid catalysts in pyrolysis of HDPE. Polym. Degrad. Stab. 98, 2512–2519.

DOI: 10.1016/j.polymdegradstab.2013.09.009

[9] Aboulkas, A., El harfi, K., El Bouadili, A., 2010. Thermal degradation behaviors of polyethylene and polypropylene. Part I: Pyrolysis kinetics and mechanisms. Energy Convers. Manag. 51, 1363–1369. https://doi.org/10.1016/j.enconman.2009.12.017.

DOI: 10.1016/j.enconman.2009.12.017

[10] Kumar, S., & Singh, R. K. (2013). Thermolysis of High-Density Polyethylene to Petroleum Products. Journal of Petroleum Engineering, 2013, 1–7. https://doi.org/10.1155/2013/987568.

DOI: 10.1155/2013/987568

[11] Jung, S.H., Cho, M.H., Kang, B.S., Kim, J.S., 2010. Pyrolysis of a fraction of waste polypropylene and polyethylene for the recovery of BTX aromatics using a fluidized bed reactor. Fuel Process. Technol. 91, 277–284. https://doi.org/10.1016/j.fuproc.2009.10.009.

DOI: 10.1016/j.fuproc.2009.10.009

[12] Ahmad, I., Ismail Khan, M., Khan, H., Ishaq, M., Tariq, R., Gul, K., Ahmad, W., 2015. Pyrolysis Study of Polypropylene and Polyethylene in to Premium Oil Products. Int. J. Green Energy 12, 663–671. https://doi.org/10.1080/15435075.2014.880146.

DOI: 10.1080/15435075.2014.880146