Oxidative thermal degradation of LDPE and the determination of some thermodynamic quantities
Küçük Resim Yok
Tarih
2009
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Elsevier Science Bv
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
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 now rate and the free activation enthalpy (Delta G(not equal)) is 148.66 kJ mol(-1) at 450 mL min(-1) air flow rate and the reaction enthalpy (Delta H(not equal)) 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. (C) 2008 Elsevier B.V. All rights reserved.
Açıklama
18th International Symposium on Analytical and Applied Pyrolysis -- MAY 18-23, 2008 -- Lanzarote, SPAIN
Anahtar Kelimeler
Thermodynamics quantities, Thermal degradation
Kaynak
Journal of Analytical and Applied Pyrolysis
WoS Q Değeri
Q2
Scopus Q Değeri
Q1
Cilt
85
Sayı
1-2
