醋酸+二甲基甲酰胺常压汽液平衡数据测定与关联  

Isobaric vapor-liquid equilibria for the binary system of acetic acid + dimethylformamide

作　　者：李新利[1] 畅伟贤[1] 管国锋[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：《化学工程》2006年第4期36-38,42,共4页Chemical Engineering(China)

基　　金：中国石油化学工业总公司扬子石油化工股份有限公司资助(YPC2003-54)

摘　　要：用改进式Rose釜测定了101.33 kPa下醋酸+二甲基甲酰胺二元体系的VLE数据,结果表明二甲基甲酰胺与醋酸形成了二元最高共沸物。实验数据通过了面积法热力学一致性检验。分别采用NRTL、W ilson、UNQUIC方程对实验数据进行关联,NRTL方程关联结果较好,温度平均偏差0.23℃,醋酸在汽相中的平均偏差为0.009 7。用NRTL方程参数推算了共沸点数据,共沸点温度155.65℃,醋酸摩尔分数0.312 7。Isobaric vapor-liquid equilibrium data for acetic acid ＋ dimethylformamide system was measured at 101.33 kPa by using an improved Rose cell. The results show that they form a maximum azeotrope. Thermodynamic consistency for the experimental data was examined by using the area test. NRTL, Wilson, UNQUIC Models were used during the data correlation, and parameters were obtained. The calculation values were in good agreement with the experimental data. For NRTL model, the average deviation of temperature is 0.23 ℃, and the average deviation in vapor phase is 0. 009 7. The azeotrope point for the experimental system was positioned using the NRTL model parameters, with the azeotrope point at 155.65 ℃ and acetic acid mole fraction of 0.312 7.

关 键 词：二甲基甲酰胺 醋酸 汽液相平衡 

分 类 号：O642.42[理学—物理化学]