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含氮气的二元系统相平衡及其计算
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摘要
随着相平衡研究的发展,更多体系的相平衡数据通过不同方法得到测量和计算。作为空气中含量最多的气体N_2,有关其相平衡特别是与酯类系统的研究甚少。为了弥补这一空白,本文选择了N_2作为研究对象,对四种酯类与N_2的系统进行了高压相平衡研究。
     本文运用自行设计的国内第一套带石英可视窗的可变体积高压釜,利用霍尔探测仪实现体积的准确测量,利用自动控温、恒温法和用手摇泵调节实现宽温度、压力范围的准确调控,用微型高压钢瓶实现高压状态直接取样,因此可方便地实现对高压气液平衡的准确测量。同时还建立了一套操作方便的组分解析装置,对气液相组成进行分析。采用静态分析法测定了一系列温度下N_2分别与碳酸二甲酯、碳酸二乙酯、乙酸乙酯、丙酸乙酯构成的二元系统的高压气液相平衡组成、相密度、体积。结果表明N_2在四种酯中溶解度随压力增加而明显增大,体现了相似相容的特性;但四种酯在气相中含量增加却不明显。其中N_2在碳酸酯系统中具有比饱和脂肪酸的酯相对较大的溶解度,且分子量越大、碳链越长,N_2的溶解度越低。而四种酯在N_2中的含量均很小,且相差不大。
     选择PR和PRSV方程分别与Van der Waals-1型、Van der Waals-2型、Margules型混合规则和活度系数表达的混合规则搭配成八种不同的计算方法,采用搜索法对上述二元高压GLE实验数据进行优化计算,系统地分析了状态方程、混合规则、回归方法等对计算结果的影响。结果表明,PRSV方程与var der waals型混合规则组成的方法、PR方程与活度系数表达的混合规则组成的方法的计算效果均较好。
With the development of the research on phase equilibria, more phase equilibrium data of different systems are measured and calculated by using many methods. The content of nitrogen in the air is the most. However, the phase equilibria containing N_2 and ester are few. So the systems containing N_2 and four esters have been experimentally investigated and calculated.
     A set of variable-volume autoclave with a quartz window has been made domestically for the first time. The accurate volume of a sample can be measured with a Hall-effect probe, and the precise adjustment within wide range of temperatures and pressures can be actualized. At high pressure, the samples can be taken directly from the autoclave with a small steel vessel. So the accurate vapor-liquid equilibrium data can be obtained. A simple equipment was also built up for the analysis the composition of the vapor and liquid samples. The vapor-liquid equilibrium data (including ingredient, density and volume) of the four binary systems (N_2+ dimethyl carbonate, N_2+diethyl carbonate, N_2+ ethyl acetate and N_2+ ethyl propionate) have been measured at different temperatures and pressures with isothermal static analytical method. The vapor-liquid equilibrium data show that the solubilities of N_2 in four esters increase drastically with increasing pressures at the given temperatures, but the contents of four esters in gas phases increase faintly. The solubilities of N_2 in the carbonate esters are higher than that in fatty acid esters, which reveals the principle that the similar structure makes the high solubility. And the higher the molecular weight is, the longer the carbon line is, the lower the solubility of N_2 is. However the contents of the four esters in N_2 are all low, and the differences among the contents are very little.
     The high-pressure GLE data are also calculated with eight methods for above four systems. The PR and PRSV EOS and four different mixing rules are used. The Suitability of those EOSs and calculated precision are discussed systemically. Three methods showed excellent calculation effects which each other were made up of (PR EOS with activity coefficient and associated theory) and (PR EOS with var der waals mixing rules).
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