碱金属硝酸盐在1,2-丙二醇—水混合溶剂中15℃和45℃的溶解行为研究  

Dissolving behaviors of alkali metal nitrates in the mixed solvents of CH_3CHOHCH_2OH-H_2O at 15℃and 45℃

作　　者：张晖英[1,2] 李淑妮[1] 翟全国[1] 欧阳淼[2] 蒋育澄[1] 胡满成[1] 

机构地区：[1]陕西师范大学化学化工学院陕西省大分子科学重点实验室,西安710062 [2]河池学院化学与生命科学系,广西宜州546300

出　　处：《华东师范大学学报（自然科学版）》2013年第5期88-95,共8页Journal of East China Normal University(Natural Science)

基　　金：国家自然科学基金(21171111);广西自然科学基金(2013GXNSFAA019048);广西高校科学技术研究(201106LX609)

摘　　要：采用自制的相平衡研究装置,用密度-折光率联合的方法,测定了碱金属硝酸盐在1,2-丙二醇/水(0～1)混合溶剂中15℃和45℃时的平衡溶解度.利用DMA4500密度计和RXA170折光率仪测定了饱和溶液15℃和45℃下的密度和折光率.实验结果表明,随着混合溶剂中1,2-丙二醇含量增加,碱金属硝酸盐的溶解度降低.饱和溶液的密度随着混合溶剂中1,2-丙二醇含量的增加而减小,但折光率却呈现出增加的趋势.用四参数经验关联方程对所有饱和体系的溶解度、折光率及密度数据进行了拟合.盐析率结果表明,1,2-丙二醇对碱金属硝酸盐都有盐析作用,温度升高,盐析率稍微增大.The equilibrium solubilities of alkali metal nitrates in the mixed solvents of CH_3CHOHCH_2OH/H_2O（0～1）at 15℃and 45℃,respectively,were studied by the of density -refractive index method on a self-made microdevice.The density and refractive index of the saturated solutions were also determined using DMA4500 densimeter and RXA170 refractive index detector at 15℃and 45℃,respectively.The solubility and density for the saturated solu- tions were found to decrease with an increase concentration of 1,2-propylene glycol,while the refractive index trended to increase.The solubility data,density and refractive index of the saturated solutions have been equated for their relationship using four parameters empirical equation. The salting-out effect indicated that the alkaline metal salts were salted out by 1,2-propylene glycol, where the higher the temperature,the slightly bigger the salting-out rate.

关 键 词：碱金属硝酸盐 1 2-丙二醇 溶解度 密度 折光率 

分 类 号：O616[理学—无机化学]