CO-CO_2-CH_3OH体系气液平衡研究

Vapor-Liquid Equilibrium of CO-CO_2-CH_3OH System

利用低温甲醇洗涤酸性气体(如CO_2,H_2S等)的工艺已在大型氨厂的合成气净化中和以煤为原料生产甲醇和城市煤气中获得了广泛的应用.在上述工况的物料中,CO的含量大约为2.5—50%.因此,为了满足工艺设计的需要,就必须掌握CO-CO_2-CH_3OH三元系的气液平衡数据.但至今尚未发现该三元系的气液平衡数据的发表,该三元系所包含的二元系——CO_2-CH_3OH,CO-CO_2和CO-CH_3OH体系却已有不少学者进行了研究.所以。

In this study the vapor and liquid equilibrium compositions in a ternary system CO-CO2-CH3OH were determined statically under the conditions of t = -5, -30, -55℃, P = 23.57×l05Pa, 79.47×l05Pa and xCo2 = 0.02-0.3.Based on the experiment, the non-ideality of the gas phase was treated with the SRK equation of state, while that of the liquid phase was treated with the Wilson model for activity coefficients. The model parameters were determined with CO-CO2, CO-CH3OH and CO2-CH3OH constituent systems. The values calculated with the model are in good agreement with the experimental values.