Thermodynamic investigation of several natural polyols |
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| Authors: | B Tong Z C Tan J N Zhang S X Wang |
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| Institution: | (1) Department of Chemistry, School of Chemical Engineering, Dalian University of Technology, Dalian, 116023, China;(2) Thermochemisty Laboratory, Dalian Institute of Chemical Physics, Chinese Academy of Science, Dalian, 116023, China;(3) Department of Food and Environment Engineering, Heilongjiang East College, Haerbin, 150086, China;(4) College of Environmental and Chemical Engineering, Dalian Jiaotong University, Dalian, 116028, China |
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| Abstract: | The low-temperature heat capacity C
p,m of erythritol (C4H10O4, CAS 149-32-6) was precisely measured in the temperature range from 80 to 410 K by means of a small sample automated adiabatic
calorimeter. A solid-liquid phase transition was found at T=390.254 K from the experimental C
p-T curve. The molar enthalpy and entropy of this transition were determined to be 37.92±0.19 kJ mol−1 and 97.17±0.49 J K−1 mol−1, respectively. The thermodynamic functions H
T-H
298.15] and S
T-S
298.15], were derived from the heat capacity data in the temperature range of 80 to 410 K with an interval of 5 K. The standard
molar enthalpy of combustion and the standard molar enthalpy of formation of the compound have been determined: Δc
H
m0(C4H10O4, cr)= −2102.90±1.56 kJ mol−1 and Δf
H
m0(C4H10O4, cr)= − 900.29±0.84 kJ mol−1, by means of a precision oxygen-bomb combustion calorimeter at T=298.15 K. DSC and TG measurements were performed to study the thermostability of the compound. The results were in agreement
with those obtained from heat capacity measurements. |
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| Keywords: | DSC erythritol heat capacity phase transition standard molar enthalpy of formation TG |
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