光学戊醇与其乙酸酯体系等压汽液相平衡研究

Isobaric vapor-liquid equilibrium for system of 2-methyl-butanol and 2-methyl-butanol acetate

用静态法分别测定了在298.15—413.15 K,乙酸2-甲基-1-丁酯饱和蒸汽压,进一步用Antoine方程关联实验数据,得到Antoine方程3个参数A=22.823 7,B=4 490.6,C=-14.377 66。采用双循环汽液平衡釜,测定了100 kPa下2-甲基-1-丁醇/乙酸2-甲基-1-丁酯二元体系的x-y-t数据和活度系数,并通过热力学一致性检验。结果表明:2-甲基-1-丁醇与乙酸2-甲基-1-丁酯可形成二元最低共沸物,共沸点温度为128.19℃,共沸组成摩尔分率x1=0.754 5。分别采用Wilson和NRTL模型对汽液平衡数据进行了关联,计算出相应的汽相组成和温度,并与实验值比较,其平均偏差分别小于0.003 7和0.004 12,为建立2-甲基-1-丁醇和乙酸2-甲基-1-丁酯的精馏分离数学模型提供了基础数据。

The saturated vapor pressures of 2-methyl-butanol acetate and 2-methyl-butanol acetate were measured by static method at 298.15-413.15 K and were correlated by Antoine equation（A=22.823 7,B=4 490.6,C=-14.377 66）.The x-y-t data and activity coefficient of the binary system of 2-methyl-butanol and 2-methyl-butanol acetate were measured at 100 kPa by using a vapor-liquid equilibrium recalculating still and were confirmed by the thermodynamic consistency check.The results show that the calculated azeotropic boiling point of the binary system is 128.19 ℃ and the azeotropic mole fraction of 2-methyl-butanol x1=0.754 5.The data correlated by Wilson equation and NRTL model show that the average deviation between the correlated values and the experimental data of gas mole fraction and temperature are lower than 0.003 7 and 0.004 12,respectively.The data can be used for building the mathematical model of separating 2-methyl-butanol and 2-methyl-butanol acetate.