二氧化碳-水混合体系的相平衡和汽-液-液三相点研究  

Phase Equilibria and Vapor-liquid-liquid Triple Point for Mixture of CO_2 and Water

作　　者：付东[1] 刘建岷[1] 杨传[1] 

机构地区：[1]华北电力大学环境科学与工程学院,保定071003

出　　处：《化学学报》2009年第23期2662-2668,共7页Acta Chimica Sinica

基　　金：国家自然科学基金(No.20606009);教育部新世纪优秀人才支持计划(No.06-0206)资助项目

摘　　要：在微扰链统计缔合流体理论(PC-SAFT)的基础上建立了适用于二氧化碳-水体系相行为研究的状态方程,以汽-液平衡和液-液平衡实验数据关联体系的交叉作用参数,关联结果与实验数据吻合良好.预测了二氧化碳-水体系存在汽-液-液三相平衡的温度和压力区间,确定了三相点的汽-液-液三相密度及其与温度和压力的关系.An equation of state applicable to the phase behavior of a CO2-water binary mixture was established based on the perturbed-chain statistical associating fluid theory （PC-SAFT）. The binary interaction parameter was regressed by fitting to the experimental data of vapor-liquid and liquid-liquid equilibria, and the correlation agreed well with experiments. The temperature and pressure ranges for vapor-liquid-liquid three phase equilibria of the CO2-water binary mixture were predicted. The densities corresponding to the coexisting three phases of the triple points and their temperature and pressure dependence were determined.

关 键 词：二氧化碳-水 相平衡 汽-液-液三相点 PC-SAFT 

分 类 号：O642.42[理学—物理化学] TQ116.3[理学—化学]