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Thermodynamic investigation of several natural polyols (I): Heat capacities and thermodynamic properties of xylitol
Tong, Bo; Tan, Zhi-Cheng; Shi, Quan; Li, Yan-Sheng; Yue, Dan-Ting; Wang, Shao-Xu; Tan ZC(谭志诚); Tan ZC(谭志诚)
关键词Xylitol Heat Capacity Phase Transition Thermodynamic Properties Standard Molar Enthalpy Of Combustion Standard Molar Enthalpy Of Formation Adiabatic Calorimetry Tg-dtg Dsc
刊名THERMOCHIMICA ACTA
2007-06-15
ISSN0040-6031
DOI10.1016/j.tca.2007.02.022
457期:1-2页:20-26
收录类别SCI
文章类型Article
部门归属15
项目归属1504
产权排名1;1
WOS标题词Science & Technology ; Physical Sciences
类目[WOS]Chemistry, Analytical ; Chemistry, Physical
研究领域[WOS]Chemistry
关键词[WOS]ENTHALPIES
英文摘要The low-temperature heat capacity C-p,m(0) of xylitol was precisely measured in the temperature range from 80 to 390 K by means of a small sample automated adiabatic calorimeter. A solid-liquid phase transition was found from the experimental C-p-T curve in the temperature range 360-375 K with the peak heat capacity at 369.04 K. The dependence of heat capacity on the temperature was fitted to the following polynomial equations with least square method. In the temperature range of 80-360 K, C-p,m(0) (J K-1 mol(-1)) = 165.87 + 105.19x + 1.8011(2) - 41.445x(3) - P 41.851x(4) + 65.152x(5) + 66.744x(6), x = [T(K) - 220]/140. In the temperature range of 370-390 K, C-p,m(0) (J K-1 mol(-1)) = 426.19 + 5.6366x, x = [T(K) - 380]/10. The molar enthalpy and entropy of this transition were determined to be 33.26 +/- 0.17 kJ mol(-1) and 90.12 +/- 0.45 J K-1 mol(-1), respectively. The standard thermodynamic functions (H-T(0) - H-298.15(0)) and (S-T(0) - S-298.15(0)), were derived from the heat capacity data in the temperature range of 80 to 390 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, Delta H-c(m)0 (C5H12O5, cr) = (-2463.2 +/- 1.2) kJ mol(-1) and Delta H-f(m)0 (C5H12O5, cr) = (-1219.3 +/- 0.3) 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 thermal stability of the compound. The results were in agreement with those obtained from heat capacity measurements. (C) 2007 Elsevier B.V. All rights reserved.
语种英语
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WOS记录号WOS:000246943200004
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被引频次:38[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://cas-ir.dicp.ac.cn/handle/321008/99729
专题中国科学院大连化学物理研究所
通讯作者Tan ZC(谭志诚); Tan ZC(谭志诚)
作者单位1.Chinese Acad Sci, Dalian Inst Chem Phys, Thermochem Lab, Dalian 116023, Peoples R China
2.Dalian Jiaotong Univ, Coll Environm Sci & Engn, Dalian 116028, Peoples R China
3.Chinese Acad Sci, Grad Sch, Beijing 100049, Peoples R China
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GB/T 7714
Tong, Bo,Tan, Zhi-Cheng,Shi, Quan,et al. Thermodynamic investigation of several natural polyols (I): Heat capacities and thermodynamic properties of xylitol[J]. THERMOCHIMICA ACTA,2007,457(1-2):20-26.
APA Tong, Bo.,Tan, Zhi-Cheng.,Shi, Quan.,Li, Yan-Sheng.,Yue, Dan-Ting.,...&谭志诚.(2007).Thermodynamic investigation of several natural polyols (I): Heat capacities and thermodynamic properties of xylitol.THERMOCHIMICA ACTA,457(1-2),20-26.
MLA Tong, Bo,et al."Thermodynamic investigation of several natural polyols (I): Heat capacities and thermodynamic properties of xylitol".THERMOCHIMICA ACTA 457.1-2(2007):20-26.
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