Oxidative thermal degradation of LDPE and the determination of some thermodynamic quantities |
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| Institution: | 1. The Inönü University, Engineering Faculty, Chemical Engineering Department, 44280-Malatya, Turkey;2. The Ankara University, Engineering Faculty, Chemical Engineering Department, 06100-Tando?an–Ankara, Turkey;1. Faculty of Mechanical Engineering, OASYS Institute of Technology, Trichy 621006, India;2. Faculty of Mechanical Engineering, K. Ramakrishnan College of Engineering, Trichy 621112, India;3. Faculty of Mechanical Engineering, Anna University, BIT Campus, Trichy 620007, India;1. Gerencia Química, Centro Atómico Constituyentes, Comisión Nacional de Energía Atómica, Av. Gral. Paz 1499, B1650KNA San Martín, Buenos Aires, Argentina;2. CONICET, Av. Rivadavia 1917, C1033AAJ Buenos Aires, Argentina;3. ECyT-UNSAM, 25 de Mayo y Francia, C.P.: 1650 San Martín, Buenos Aires, Argentina;4. Departamento de Química Inorgánica, Analítica y Química Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pab. II, C1428EHA, Buenos Aires, Argentina;1. CAPE Lab, School of Chemical Engineering, Iran University of Science & Technology (IUST), Narmak, Tehran, 168461-3114, Iran;2. Research Institute of Petroleum Industry (RIPI), Olympic Sq., Tehran, 14665-1998, Iran |
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| Abstract: | The pyrolysis of polyolefin wastes is one of the possible ways to obtain chemical feedstocks. In this work, the thermal degradation of low density polyethylene, (LDPE), which is a major product within plastics, was investigated in a semi-batch reactor system. First-order rate kinetics approach was chosen and reaction rate coefficients, k, and some thermodynamic quantities determined such as activation energy, reaction enthalpy, free activation enthalpy, and entropy of degradation of LDPE for different air flow rates. We found that the maximum value of some thermodynamic quantities, such as reaction rate coefficient is 0.0243 min?1 at 600 mL min?1 air flow rate and the free activation enthalpy (ΔG≠) is 148.66 kJ mol?1 at 450 mL min?1 air flow rate and the reaction enthalpy (ΔH≠) is 57.65 J mol?1 at 623 K temperature conditions. Moreover, we found that the oxidative degradation of LDPE is not spontaneous and has lower energy necessary (for degradation) than non-oxidative degradation processes. |
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