物理化学学报 >> 1994, Vol. 10 >> Issue (06): 501-507.doi: 10.3866/PKU.WHXB19940605

研究论文 上一篇    下一篇

甲烷在水-叔丁醇混合溶剂中的溶解度

潘竟军, 韩布兴, 闫海科, 李芝芬, 刘瑞麟   

  1. 中国科学院化学研究所,北京 100080|北京大学物理化学研究所,北京 100871
  • 收稿日期:1993-02-01 修回日期:1993-04-16 发布日期:1994-06-15
  • 通讯作者: 闫海科

Solubilities of Methane in Mixed Solvents of Water and t-butye Alcohol

Pan Jing-Jun, Han Bu-Xing, Yan Hai-Ke, Li Zhi-Fen, Liu Rui-Lin   

  1. Institute of Chemistry, Academia Sincia, Beijing 100080| Institute of Physical Chemistry, Peking University, Beijing 100871
  • Received:1993-02-01 Revised:1993-04-16 Published:1994-06-15
  • Contact: Yan Hai-Ke

摘要:

在303.15 K、313.15 K、323.15 K、333.15 K温度下,0-6 MPa压力范围内测定了甲烷在水-叔丁醇混合溶剂中的溶解度.溶剂中叔丁醇的摩尔分数(x_(TBA))从0到1.结果表明,在温度和溶剂组成一定条件下,甲烷的溶解度随其分区的增加而增大,随x_(TBA)的增加,在富水区内,甲烷的溶解度变化较缓慢,当x_(TBA)超过某值时,甲烷的溶解度随x_(TBA)的增加而增大,并且幅度较大;在x_(TBA)约为0-0.045范围内,甲烷的溶解度随温度增加而减小,x_(TBA)约在0.045-0.15范围内,溶解度随温度增加而增加,x_(TBA)约在0.15~1.0范围内,溶解度随温度增加而减小.根据溶解度与温度和溶剂组成的关系可以推测,在303.15-333.15 K、0-6 MPa范围内,水-叙丁醇混合溶剂中仍存在笼合物结构.根据溶解度与温度、压力的关系讨论了甲烷在此混合溶剂中的亨利常数、偏摩尔体积、标准溶解自由能、标准溶解焓和标准溶解熵.

关键词: 甲烷, 水, 叔丁醇, 气体溶解度, 热力学性质

Abstract:

Solubilities of methane in binary mixtures of water and t-butyl alcohol (TBA) have been measured in the temperature range from 303.15 K to 333.15 K and at pressures up to 6 MPa. The mole fraction of t-butyl alcohol(x_(TBA)) in the mixed solvents varied from 0.0 to 1.0. The dependence of the solubilities on temperature and the composition of the mixed solvents can be explained by clathrate structure in the mixed solvents. The Henry s Law constans, the partial mole volumes of methane in the solvents, and the standard thermodynamic functions (ΔG°, ΔH°, ΔS°) have been calculated and discussed.

Key words: Methane, Water, t-butyl alcohol, Gas solubility, Thermodynamic properties