CIESC Journal

• Volume 2 • 上一篇    下一篇

MCSPT—A MODIFIED HARD-SPHERE THREE-PARAMETE EQUATION OF STATE FOR THERMODYNAMIC PROPERTIES OF PURE COMPOUNDS

李平1; 许志宏2   

  1. 1 Department of Chemical Engineering, Tianjin University, Tianjin 300072, China

    2 Institute of Chemical Metallurgy, Academia Sinica Beijing 100080, China

  • 收稿日期:1992-12-10 修回日期:1993-03-15 出版日期:1994-03-28 发布日期:1994-03-28
  • 通讯作者: 李平

MCSPT—A MODIFIED HARD-SPHERE THREE-PARAMETE EQUATION OF STATE FOR THERMODYNAMIC PROPERTIES OF PURE COMPOUNDS

LI Ping1; XU Zhihong2   

  1. 1 Department of Chemical Engineering, Tianjin University, Tianjin 300072, China

    2 Institute of Chemical Metallurgy, Academia Sinica Beijing 100080, China

  • Received:1992-12-10 Revised:1993-03-15 Online:1994-03-28 Published:1994-03-28
  • Contact: LI Ping

摘要: The hard-sphere three-parameter equation of state(CSPT)proposed in the previous paper(Li et al.1991)was modified by a new temperature relation for the pseudo-critical compressibility ξand the temperaturecorrection factor α(T_r)of the attractive parameter.Vapor pressures and Saturated liquid densities of 105 purecompounds were calculated by the modified version.Results show that correlations of saturated properties at lowreduced temperatures and thermodynamic properties in the vicinity of critical region were significantly improved.Furthermore,characteristic parameters of this modified version were generalized by acentric factor ωand criticalcompressibility Z_c to predict saturated liquid densities of 72 polar substances and the latent heat of vaporizationfor 151 substances including strongly polar compounds with satisfactory results.

Abstract: The hard-sphere three-parameter equation of state(CSPT)proposed in the previous paper(Li et al.1991)was modified by a new temperature relation for the pseudo-critical compressibility ξand the temperaturecorrection factor α(T_r)of the attractive parameter.Vapor pressures and Saturated liquid densities of 105 purecompounds were calculated by the modified version.Results show that correlations of saturated properties at lowreduced temperatures and thermodynamic properties in the vicinity of critical region were significantly improved.Furthermore,characteristic parameters of this modified version were generalized by acentric factor ωand criticalcompressibility Z_c to predict saturated liquid densities of 72 polar substances and the latent heat of vaporizationfor 151 substances including strongly polar compounds with satisfactory results.