正丁醇-二甲苯二元系固液相平衡和过量Gibbs自由能的研究

STUDY ON SOLIDLIQUID PHASE EQUILIBRIA AND EXCESS GIBBS FREE ENERGIES FOR BINARY MIXTURES OF nBUTANOL AND XYLENE

测制了正丁醇－邻、间、对二甲苯二元系固液平衡相图。３个体系均属简单低共熔混合物类。计算了它们在２９８．１５Ｋ的摩尔过量Ｇｉｂｂｓ自由能ＧＥｍ。结果表明，３个体系对理想溶液均产生较大的正偏差。３个体系ＧＥｍ的最大值分别为９８５、１０２３和１２５８Ｊｍｏｌ－１。

Melting temperatures have been measured and the solidliquid phase diagrams were constructed for nbutanol+oxylene,nbutanol+mxylene and nbutanol+pxylene.They are simple eutectic systems.Excess mole Gibbs free energies were calculated at 29815K,showing large positive deviations from idealsolution behavior.The largest values of GEm are 985,1023 and 1258 J·mol-1 for oC6H4(CH3)2+C4H9OH,mC6H4(CH3)2+C4H9OH and pC6H4(CH3)2+C4H9OH,respectively.