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混合工质的TPvX数据和汽液平衡(TPxy)数据是两类重要的热力学基础数据。前者主要用PVTX装置测定,后者则用汽液平衡釜结合色谱分析得到,但一般限于中、低压范围.倘用PVTX装置来研究混合工质的汽液平衡,由于其测量方便,精度高以及温度压力范围广,有其独特优点.常用的定容线斜率分析法和直接观察法,只能产生泡点(TPx)或露点(TPy)数据,而x、y不可兼得,要得全面的汽液平衡关系,实验量太大,因而此法受到限制.本文提出探讨的一种方法,由PVTX装置测定的两相区实验数据PvTX(X为混合物总组成)直接推算汽液平衡的TPxy数据,可以弥补前述方法的缺陷,直接提供高温高压汽液平衡数据,并把PvTX和TPxy两类数据统一起来研究.
TPvX data and TPxy data for mixed media are two important types of thermodynamic data. The former is mainly measured by the PVTX device and the latter by the vapor-liquid equilibrium kettle combined with chromatographic analysis, but generally limited to the medium and low pressure range.When the PVTX device is used to study the vapor-liquid equilibrium of the mixed working medium, due to its convenient measurement, high precision and A wide range of temperature and pressure, has its own unique advantages. Commonly used fixed line slope analysis and direct observation method, can only produce bubble point (TPx) or dew point (TPy) data, and x, y can not have both, to be comprehensive Vapor-Liquid Equilibrium, the amount of experiment is too large, so this method is limited.This paper presents a method to explore, by PVTX device measured two-phase region of the experimental data PvTX (X is the total composition of the mixture) directly estimated vapor-liquid equilibrium TPxy data , Can make up for the shortcomings of the above method, directly provide high temperature and pressure vapor-liquid equilibrium data, and the PvTX and TPxy two types of data unified research.