A modification of a in SRK equation of state and vapor-liquid equilibria prediction

作者：Luo Mingjian; Ma Peisheng^*; Xia Shuqian

来源：Chinese Journal of Chemical Engineering, 2007, 15(1): 102-109.

• SRK equation of state
• vapor liquid equilibrium
• saturated pressure
• prediction

Based on results of saturated vapor pressures of pure substances calculated by SRK equation of state, the factor a in attractive pressure term was modified. Vapor-liquid equilibria of mixtures were calculated by original and modified SRK equation of state combined with MRV 1 mixing rule and UNIFAC model, respectively. For 1447 saturated pressure points of 37 substance including alkanes; organics containing chlorine, fluorine, and oxygen; inorganic gases and water, the original SRK equation of state predicted pressure with an average deviation of 2.521% and modified one 1.673%. Binary vapor-liquid equilibria of alcohols containing mixtures and water containing mixtures also indicated that the SRK equation of state with the modified a had a better precision than that with the original one.

• 出版日期2007-2
• 单位东北石油大学; 天津大学