极性非质子溶剂与甲醇或1,2-二氯乙烷的汽液平衡

VAPOR-LIQUID EQUILIBRIUM FOR SOME POLAR APROTIC SOLVENTS WITH METHANOL OR 1,2-DICHLOROETHANE

使用双沸点仪测定了丙酮、乙酸乙酯、对二氧六环、乙腈或三乙胺与甲醇或1,2→二氯乙烷以及二者混合物等十一组二元体系在99.3kPa下的汽液平衡数据(T,x,p),计算了有关体系的过量吉布斯自由能。结果表明,六种非质子溶剂与甲醇组成的二元系GE>0;乙腈或三乙胺与1,2-二氯乙烷组成的二元系GE>0,而丙酮、乙酸乙酯或对二氧六环与1,2-二氯乙烷的二元混合物GE<0。从同种分子间或不同种分子间的缔合作用对上述结果进行了讨论。本文还在固定极性非质子溶剂(第三组分)物质的量浓度的条件下,测定了非质子溶剂+1,2-二氯乙烷+甲醇三元混合物的汽液平衡数据,考察了非质子溶剂的加入对甲醇+1,2-二氯乙烷二元系GE的影响。

Isobaric vapor-liquid equilibrium data have been measured at 99.3kPa for the binary mixtures of acetone(AON), ethyl acetate(EA), p-dioxane (p-DXN),acetonitrile(AN) or triethylamine (TEA) with methanol or 1,2-dichloroethane (DCE) and of DCEwith methanol by using a double ebulliometer. Van Laar equation and Wilson equationwere used to correlate VLE data and Barker's method to estimate the vapor composi-tion from (T,x,p) data. Excess Gibbs free energies for the reported binary mixtureswere also calculated from the two equations. The values of G^E for the methanolmixtures and DCE+AN or + TEA are positive. G^E of the other mixtures arenegative. The results are briefly discussed based on the hydrogen bonding betweenlike and unlike molecules and some physical properties of aprotic solvents. Addi-tionally,vapor-liquid equilibrium data for the ternary mixtures,aprotic solvent+MeOH+DCE, were also measured under the given concentration of aprotic solvent.