Thermodynamic investigation of several natural polyols (I): Heat capacities and thermodynamic properties of xylitol
文献类型：期刊论文
| 作者 | Tong, Bo; Tan, Zhi-Cheng; Shi, Quan; Li, Yan-Sheng; Yue, Dan-Ting; Wang, Shao-Xu |
| 刊名 | thermochimica acta
 |
| 出版日期 | 2007-06-15 |
| 卷号 | 457期号:1-2页码:20-26 |
| 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 |
| ISSN号 | 0040-6031 |
| 产权排序 | 1;1 |
| 通讯作者 | 谭志诚 |
| 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. |
| 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 |
| 收录类别 | SCI |
| 原文出处 | true |
| 语种 | 英语 |
| WOS记录号 | WOS:000246943200004 |
| 公开日期 | 2010-11-30 |
| 源URL | [http://159.226.238.44/handle/321008/99729]  |
| 专题 | 大连化学物理研究所_中国科学院大连化学物理研究所 |
| 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 |
| 推荐引用方式 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,&Wang, Shao-Xu.(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. |
入库方式： OAI收割
来源：大连化学物理研究所
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