碳酸二甲酯与烷烃混合物的临界性质  

The Critical Properties of Dimethyl Carbonate(DMC)+Alkanes Mixtures

作　　者：何茂刚[1] 王成杰 辛楠[1] 刘洋[1] 刘向阳[1] HE Mao-Gang;WANG Cheng-Jie;XIN Nan;LIUfang;LIU Xiang-Yang(MOE Key Laboratory of Thermo-Flluid Science and Engineering, Xi＇an JiaoTong University, Xi＇an 710049, China)

机构地区：[1]西安交通大学热流科学与工程教育部重点实验室,西安710049

出　　处：《工程热物理学报》2018年第6期1181-1185,共5页Journal of Engineering Thermophysics

基　　金：国家杰出青年科学基金(No.51525604);国家重点基础研究发展计划(No.2015CB251502)

摘　　要：本文基于低停留时间流动法建立了一套临界性质实验测量系统,该系统温度和压力的测量不确定度分别小于0.20 K和5.2 kPa。首次测量了碳酸二甲酯与正己烷、正庚烷、正辛烷、正壬烷和正癸烷五种烷烃的二元混合体系的临界性质,结果表明:各混合体系的临界温度随碳酸二甲酯混合比例的增加呈抛物线变化,临界压力随混合体系中临界压力较大物质混合比例的增加而增大。运用Redlich-Kister方程对以上混合体系临界性质进行了关联,临界温度和临界压力的平均绝对偏差分别小于0.04%和0.25%.An experimental apparatus for the measurement of critical properties based on the low residence time flow method was established. The standard uncertainties of temperatures and pressures are estimated to be less than 0.2 K and 5.2 kPa, respectively. The critical temperatures and critical pressures of five binary mixtures, DMC ＋ hexane, DMC ＋ heptane, DMC ＋ octane,DMC ＋ nonane and DMC ＋ decane are reported for the first time. Experimental results show the critical temperatures of the binary mixtures tend to change as parabola project on the DMC ratio while the critical pressures increase with the ratio of components have higher critical pressures.The experimental results are correlated using the Redlich-Kister equations. The average absolute deviations are less than 0.04% for critical temperatures and 0.25% for critical pressures.

关 键 词：临界性质 流动法 二元混合物 

分 类 号：TK121[动力工程及工程热物理—工程热物理]