中压下由温度、压力与液相组成确定二元系平衡汽相组成

Determination of Vapor Composition of Binary Systems from Temperature, Pressure and Liquid Composition at Moderate Pressure Conditions

本文提出了一种在中压条件下由温度T、压力p与液相组成x确定平衡汽相组成y的方法。选一个能同时适用于汽液两相的状态方程,用T、p、x数据拟合得出该方程的可调参数,即可同时求得y。对大量文献数据的计算结果表明,该方法是可靠的。使用该方法对我们测定的甲醇—丙酮、二氟二氯甲烷—正戊烷、二氟二氯甲烷—丙酮三对二元系在常沸点以上的平衡蒸汽总压进行计算,得到了完整的T、p、x、y平衡数据。

A method for determination of vapor composition y from T, p and liquid composition x at moderate pressure conditions has been developed. An equation of state applicable for both vapor and liquid phases is first selected. The adjustable parameters of this equation are then simulated from the experimental T, p, x data, and vapor composition can be calculated. The calculated results for a series of systems found in literature indicate that this method is accurate and reliable, and can meet the requirements in engineering design. By applying this method to the experimental vapor pressure data above the normal boiling point measured at this laboratory for three binaries, methanol-acetone, freon12-pentane and freon12-acetone, the complete VLE data, T, p, x and y are obtained.