苯酚-叔丁醇二元体系液固平衡相图测定

Determination of phase diagram of liquid-solid equilibrium between phenol and tert-butyl alcohol

用步冷曲线法测定苯酚-叔丁醇的液固平衡相图。苯酚-叔丁醇体系有3个共熔点温度,即5.0、3.9、13.0℃,对应的共熔点混合物中苯酚的质量分数分别为:17.0%、60.0%和80.1%,摩尔分数分别为:0.140、0.541和0.761。该体系有2个相合熔点,分别为17.4℃和15.7℃,对应的相合熔点化合物中苯酚的摩尔分数分别为0.326和0.668,所形成的相合熔点化合物的分子式可以表达为:(C6H5OH)[(CH3)3COH]2和(C6H5OH)2[(CH3)3COH]。

Abstract.. The phase diagram of liquid-solid equilibrium between phenol and tert-butyl alcohol is measured by means of the cooling curve method. There are three eutectic points in this system, which are 5.0, 3. 9 and 13.0 ℃ ,： respectively. The corresponding compositions ~or the eutectic points are 17.0% （wt）, 60.0% （wt） and 80, 1% （wt） for phenol, respectively. Two congruent points are observed from the phase diagram, which means two definite compounds crystallize on cooling, i. e , （C6 H3 OH） （[（CHa）a COH]z and （C6 H5 OH）2 （[（CH3 COH], below 17.4 ℃ and 15.7 ℃, respectively.