物理化学学报 >> 2008, Vol. 24 >> Issue (07): 1316-1320.doi: 10.3866/PKU.WHXB20080734

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N,N-二甲基甲酰胺在不同浓度氯化钠水溶液中的稀释过程热力学

刘敏; 朱兰英; 李斌; 赵强; 孙得志; 林瑞森   

  1. 聊城大学化学化工学院, 山东 聊城 252059; 聊城大学生命科学学院, 山东 聊城 252059; 浙江大学化学系, 杭州 310027
  • 收稿日期:2007-12-29 修回日期:2008-04-15 发布日期:2008-07-04
  • 通讯作者: 刘敏 E-mail:liumin_panpan@163.com

Thermodynamics of Dilution of N,N-Dimethylformamide in Aqueous Sodium Chloride Solutions at Different Concentrations

LIU Min; ZHU Lan-Ying; LI Bin; ZHAO Qiang; SUN De-Zhi; LIN Rui-Sen   

  1. College of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng 252059, Shandong Province, P. R. China; College of Life Science and Bioengineering, Liaocheng University, Liaocheng 252059, Shandong Province, P. R. China; Department of Chemistry, Zhejiang University, Hangzhou 310027, P. R. China
  • Received:2007-12-29 Revised:2008-04-15 Published:2008-07-04
  • Contact: LIU Min E-mail:liumin_panpan@163.com

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摘要：

应用等温流动微量热法测定了298.15 K时N,N-二甲基甲酰胺(DMF)在纯水及不同浓度氯化钠水溶液中的稀释焓, 根据McMillan-Mayer理论计算得到各级同系焓相互作用系数. 结果表明, DMF在纯水及氯化钠水溶液中的焓对相互作用系数h2均为正值, 并且随着氯化钠浓度的增加, h2的值逐渐增大. 根据溶质-溶质相互作用和溶质-溶剂相互作用对结果进行了解释.

关键词: N,N-二甲基甲酰胺, 氯化钠, 稀释焓, 焓对相互作用系数

Abstract:

The dilution enthalpies of N,N-dimethylformamide (DMF) in pure water and aqueous sodium chloride solutions were determined by using flow microcalorimetry at 298.15 K. The homogeneous enthalpic interaction coefficients in the range of sodium chloride concentration from 0 to 0.6 mol·kg-1 were calculated according to the McMillan-Mayer theory. It was found that enthalpic pairwise interaction coefficients (h2) of DMF were all positive in aqueous sodium chloride solutions and became larger with increasing the concentration of sodium chloride. The results were discussed in terms of the solute-solute and solute-solvent interactions.

Key words: N,N-dimethylformamide, Sodiumchloride, Dilution enthalpy, Enthalpic pairwise interaction coefficient

MSC2000: 

  • O641