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题名: Thermodynamic investigation of crystalline K2Cr2O7 and aqueous K2Cr2O7 solution
作者: Nan, ZD;  Lan, XZ;  Sun, LX;  Tan, ZC
关键词: heat pipe ;  working fluid ;  potassium dichromate ;  aqueous solution ;  heat capacity ;  thermodynamic function ;  adiabatic calorimetry
刊名: INTERNATIONAL JOURNAL OF THERMAL SCIENCES
发表日期: 2003-07-01
DOI: 10.1016/S1290-0729(03)00031-0
卷: 42, 期:7, 页:657-664
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Thermodynamics ;  Engineering, Mechanical
研究领域[WOS]: Thermodynamics ;  Engineering
英文摘要: The molar heat capacities (C-p,C-m) of crystalline potassium dichromate (K2Cr2O7 (cr)) and aqueous K2Cr2O7 solution (0.1699 mol(.)kg(-1)) were measured in the temperature range from 100 to 390 K and from 80 to 370 K by an automatic adiabatic calorimeter equipped with a small cell of internal volume of 6 cm(3), respectively. No phase transition took place in the temperature range from 100 to 390 K for K2Cr2O7 (cr). The relationships of C-p,C-m of K2Cr2O7 (cr) with respect to T were established to be C-p,C-m = 177.53 + 161.92X - 138.14X(2) - 209.67X(3) + 160.35X(4) + 137.44X(5) - 41.291X(6) and C-p,C-m = 177.52 + 171.66X - 149.59X(2) - 246.17X(3) + 194.79X(4) + 167.30X(5) - 64.368X(6) (X = (T - 245.00)/145.00) for Series I and Series 2 experiments, respectively. No phase transition took place for the solution from 80 to 270 K. The function of C-p,C-m of the solution with respect to T was established to be C-p,C-m = 0.137T + 2.5068 [J(.)K(-1.)mol(-1)]. A fusion transition at T-fus = 272.19 K was found from the C-p,C-m-T curve of the solution. The molar enthalpy and entropy of the phase transition were calculated to be 6.115 kJ(.)mol(-1) and 22.47 J(.)K(-1.)mol(-1), respectively. The molar heat capacities of the solution are about a constant in the temperature range from 275 K to 370 K, C-p,C-m =76.75 +/- 1.12 [J(.)K(-1.)mol(-1)]. The thermodynamic data of K2Cr2O7 (cr) and the solution were derived from the heat capacity data and the relationship of thermodynamic functions. (C) 2003 Editions scientifiques et medicales Elsevier SAS. All rights reserved.
关键词[WOS]: HEAT-CAPACITIES ;  PIPES
语种: 英语
WOS记录号: WOS:000183949600003
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/138287
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Qufu Normal Univ, Dept Chem, Qufu 273165, Peoples R China
2.Chinese Acad Sci, Dalian Inst Chem Phys, Thermochem Lab, Dalian 116023, Peoples R China

Recommended Citation:
Nan, ZD,Lan, XZ,Sun, LX,et al. Thermodynamic investigation of crystalline K2Cr2O7 and aqueous K2Cr2O7 solution[J]. INTERNATIONAL JOURNAL OF THERMAL SCIENCES,2003,42(7):657-664.
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