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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)
KeywordXylitol Heat Capacity Phase Transition Thermodynamic Properties Standard Molar Enthalpy Of Combustion Standard Molar Enthalpy Of Formation Adiabatic Calorimetry Tg-dtg Dsc
Source PublicationTHERMOCHIMICA ACTA
2007-06-15
ISSN0040-6031
DOI10.1016/j.tca.2007.02.022
Volume457Issue:1-2Pages:20-26
Indexed BySCI
SubtypeArticle
Department15
Funding Project1504
Contribution Rank1;1
WOS HeadingsScience & Technology ; Physical Sciences
WOS SubjectChemistry, Analytical ; Chemistry, Physical
WOS Research AreaChemistry
WOS KeywordENTHALPIES
AbstractThe 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.
Language英语
URL查看原文
WOS IDWOS:000246943200004
Citation statistics
Cited Times:38[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://cas-ir.dicp.ac.cn/handle/321008/99729
Collection中国科学院大连化学物理研究所
Corresponding AuthorTan ZC(谭志诚); Tan ZC(谭志诚)
Affiliation1.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
Recommended Citation
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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