Nonisothermal decomposition kinetics of abietic acid in argon atmosphere / Weijian Nong in Industrial & engineering chemistry research, Vol. 50 N° 24 (Décembre 2011)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 50 N° 24 (Décembre 2011) . - pp. 13727-13731 Titre : Nonisothermal decomposition kinetics of abietic acid in argon atmosphere Type de document : texte imprimé Auteurs : Weijian Nong, Auteur ; Xiaopeng Chen, Auteur ; Linlin Wang, Auteur Année de publication : 2012 Article en page(s) : pp. 13727-13731 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Kinetics Résumé : Abietic acid was isolated from rosin by means of reaction-crystallization coupled with exposure to ultrasonic waves, and it was then characterized by its specific rotation, infrared spectra, and 13C nuclear magnetic resonance spectra. The thermal decomposition of abietic acid in argon atmosphere was studied under nonisothermal conditions using TG-DTG techniques with beating rates of 5,10,20, and 25 K/min. For the kinetic study, the nonisothermal kinetic parameters were obtained via the analysis of the TG-DTG curves by using the Flynn-Wall-Ozawa (FWO) method, the Kissinger method, and the integral method. The results showed that the nonisothermal decomposition mechanism of abietic acid in argon atmosphere followed Mampel Power law with n = 3/2, whose differential and integral forms were f(α)=2/3α―1/2 and G(α) α3/2. The apparent activation energy Ea and the pre-exponential factor A were 123.44 kJ/mol and 1.78 × 1011 s―1, respectively. The kinetic equation can be expressed as da/dt=1.19 x 1011 α―1/2 exp(―1.48 x 104/T). The thermodynamic parameters (ΔH‡, ΔG‡, and ΔS‡) were calculated as well. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25299835 [article] Nonisothermal decomposition kinetics of abietic acid in argon atmosphere [texte imprimé] / Weijian Nong, Auteur ; Xiaopeng Chen, Auteur ; Linlin Wang, Auteur . - 2012 . - pp. 13727-13731. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 24 (Décembre 2011) . - pp. 13727-13731 Mots-clés : Kinetics Résumé : Abietic acid was isolated from rosin by means of reaction-crystallization coupled with exposure to ultrasonic waves, and it was then characterized by its specific rotation, infrared spectra, and 13C nuclear magnetic resonance spectra. The thermal decomposition of abietic acid in argon atmosphere was studied under nonisothermal conditions using TG-DTG techniques with beating rates of 5,10,20, and 25 K/min. For the kinetic study, the nonisothermal kinetic parameters were obtained via the analysis of the TG-DTG curves by using the Flynn-Wall-Ozawa (FWO) method, the Kissinger method, and the integral method. The results showed that the nonisothermal decomposition mechanism of abietic acid in argon atmosphere followed Mampel Power law with n = 3/2, whose differential and integral forms were f(α)=2/3α―1/2 and G(α) α3/2. The apparent activation energy Ea and the pre-exponential factor A were 123.44 kJ/mol and 1.78 × 1011 s―1, respectively. The kinetic equation can be expressed as da/dt=1.19 x 1011 α―1/2 exp(―1.48 x 104/T). The thermodynamic parameters (ΔH‡, ΔG‡, and ΔS‡) were calculated as well. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25299835

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