甲酸-水-甲酸戊酯体系的等压汽液平衡研究  

Study on Isobaric Vapor-Liquid Equilibrium of Formic Acid-Water-n-Pentyl Formate Systems

作　　者：陶红[1] 管国锋[1] 畅伟贤[1] 万辉[1] 

机构地区：[1]南京工业大学化学化工学院,江苏南京210009

出　　处：《高校化学工程学报》2007年第6期924-928,共5页Journal of Chemical Engineering of Chinese Universities

摘　　要：用改进的Rose釜测定了101.325kPa下甲酸-水、甲酸-甲酸戊酯、甲酸-水-甲酸戊酯体系的等压汽液平衡数据。考虑到甲酸在汽相中的缔合效应,用Hayden-O’connell关联式修正了汽相的非理想性,用非线性最小二乘法关联了甲酸-水和甲酸-甲酸戊酯体系的汽液平衡数据,获得了NRTL和UNIQUAC方程的模型参数。利用得到的二元体系NRTL模型参数,结合部分三元体系汽液平衡数据,关联得到水-甲酸戊酯体系的NRTL模型参数。由关联得到的三对二元NRTL模型参数预测部分三元体系汽液平衡数据,计算值与实验值基本吻合。Isobaric vapor-liquid equilibrium （VLE） data for formic acid-water, formic acid-pentyl formate and formic acid-water-pentyl formate systems were measured at 101.325 kPa by using an improved Rose still. The association effect of formic acid in vapor phase was considered, and the nonideality of vapor phase was corrected by Hayden-O＇connell equations. The VLE data for formic acid-water and formic acid-pentyl formate systems were correlated by the NRTL and UNIQUAC models, and the binary interaction parameters of these models were obtained by applying the nonlinear least square method. Combining the obtained NRTL model parameters of binary systems with partial ternary VLE data, the NRTL model parameters of water-pentyl formate system were determined, and then the obtained NRTL model parameters were used to predict the VLE data of the ternary system. For ternary system of formic acid-water-pentyl formate, the average absolute deviations of predictions for vapor-phase mole fraction of water and pentyl formate are 0.0292 and 0.0273, respectively, and for the equilibrium temperature is 0.94℃.

关 键 词：甲酸 水 甲酸戊酯 汽液平衡 

分 类 号：O642.42[理学—物理化学]