Heat capacity, enthalpy of formation, and entropy of methyl carbamate / Zuo-Xiang Zeng in Industrial & engineering chemistry research, Vol. 49 N° 12 (Juin 2010)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 49 N° 12 (Juin 2010) . - pp. 5543–5548 Titre : Heat capacity, enthalpy of formation, and entropy of methyl carbamate Type de document : texte imprimé Auteurs : Zuo-Xiang Zeng, Auteur ; Xiao-Nan Li, Auteur ; Wei-Lan Xue, Auteur Année de publication : 2010 Article en page(s) : pp. 5543–5548 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Methyl carbamate Heat capacity Résumé : The heat capacity (Cp) of methyl carbamate (MC) was measured with an adiabatic calorimeter. The standard enthalpy of formation (ΔfH0(cr, 298.15 K)) and the standard entropy (S0(cr, 298.15 K)) for MC were determined. Thus, Cp(T) values of MC were obtained for the crystal and liquid forms in the temperature range of 298.15−433.10 K. A quadratic trinomial was used to correlate the data of Cp(T). The enthalpy of fusion of MC was measured using differential scanning calorimetry (DSC), and its sublimation enthalpy was estimated. The gas-phase standard enthalpy of formation (ΔfH0(g, 298.15 K)) of MC was calculated via the method of group contribution developed by Benson. Based on the above data, the values of ΔfH0(cr, 298.15 K) and S0(cr, 298.15 K) of MC were estimated to be −513.57 kJ/mol and 77.1 J mol−1 K−1, respectively. A thermochemical cycle including a reversible reaction was designed to examine the reliability of the estimated values by measuring the equilibrium constant of the reaction. The results showed that the estimated values for MC were acceptable. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9014342 [article] Heat capacity, enthalpy of formation, and entropy of methyl carbamate [texte imprimé] / Zuo-Xiang Zeng, Auteur ; Xiao-Nan Li, Auteur ; Wei-Lan Xue, Auteur . - 2010 . - pp. 5543–5548. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 12 (Juin 2010) . - pp. 5543–5548 Mots-clés : Methyl carbamate Heat capacity Résumé : The heat capacity (Cp) of methyl carbamate (MC) was measured with an adiabatic calorimeter. The standard enthalpy of formation (ΔfH0(cr, 298.15 K)) and the standard entropy (S0(cr, 298.15 K)) for MC were determined. Thus, Cp(T) values of MC were obtained for the crystal and liquid forms in the temperature range of 298.15−433.10 K. A quadratic trinomial was used to correlate the data of Cp(T). The enthalpy of fusion of MC was measured using differential scanning calorimetry (DSC), and its sublimation enthalpy was estimated. The gas-phase standard enthalpy of formation (ΔfH0(g, 298.15 K)) of MC was calculated via the method of group contribution developed by Benson. Based on the above data, the values of ΔfH0(cr, 298.15 K) and S0(cr, 298.15 K) of MC were estimated to be −513.57 kJ/mol and 77.1 J mol−1 K−1, respectively. A thermochemical cycle including a reversible reaction was designed to examine the reliability of the estimated values by measuring the equilibrium constant of the reaction. The results showed that the estimated values for MC were acceptable. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9014342

Exemplaires

Code-barres	Cote	Support	Localisation	Section	Disponibilité
aucun exemplaire