【摘要】 提出了改进的DDLC-MH(81)状态方程,用于丙烷-乙醇-水体系二元汽液平衡数据的关联计算,其模型参数与温度有良好的线性关系.并用汽相循环法测定了该体系在不同温度下的二元及三元VLE数据,结果与模型的推算值取得良好的一致.并用模型预测了超临界丙烷条件下的三元相平衡数据.结果表明,在液相乙醇浓度高于0.2的情况下,超临界丙烷比超临界二氧化碳有更高的乙醇溶解度和选择性.更多还原

【Abstract】 A modified DDLC-MH(81) equation of state was proposed to correlate binary vapor - liquid equilibrum data in literature for a propane - ethanol - water system. The binary interaction parameters were linear functions of temperatures. The vapor - liquid equilibrium data for the binary and ternary systems were determined by means of a circulation apparatus. The experimental results were in good agreement with predicted results by using the model. Then the phase behavior of the ternary system under supercritical propane condition was predicted. The results showed that the solubilities and selectivities of ethanol solutions by using super - critical propane as solvent were better than supercritical carbon dioxide under the condition that the ethanol mole fractions in liquid phase were more than 0. 2.更多还原