摘要
利用激光检测装置,测定了间苯二甲酸在水及不同质量分数的醋酸-水溶液中的溶解度和结晶介稳区宽度,并对4个体系的溶解度数据采用λh方程进行了关联,计算值与实验值的绝对平均偏差分别为5.78%,2.02%,3.74%和1.56%,进而求得了溶液的结晶焓.实验结果表明,间苯二甲酸在所考察的体系中的溶解度均随温度的升高而增大,在醋酸-水溶液中的溶解度随醋酸浓度的增加而增大,而介稳区宽度均随温度的增加而变窄,在醋酸-水溶液中介稳区宽度较在水中的窄.各体系的混合热均随温度和溶质浓度的增加而增大.
Using a laser observation technique, the saturation solubility and crystallization metastable zone width in water and aqueous acetic acid solutions of different acetic acid concentrations were determined. The solubilities of four systems were correlated by λh equation and the heats of crystallization were evaluated based on the equation. The calculated absolute average deviations （AAD） of the four systems were 5.78%, 2.02%, 3.740% and 1.5%, respectively. It was found that, the solubilities increased significantly with the increase of temperature in all reported systems, and that with the increase of acetic acid concentration in aqueous acetic acid solution as well, while the metastable width decreased with the increase of temperature and the presence of acetic acid. The enthalpy of mixing increased with the increase of temperature and solute concentration.
出处
《北京理工大学学报》
EI
CAS
CSCD
北大核心
2005年第8期749-752,共4页
Transactions of Beijing Institute of Technology
基金
国家部委预研项目(202036)
关键词
间苯二甲酸
溶解度
介稳区宽度
结晶热力学
m-phthalic acid
solubility
metastable zone width
crystallization thermodynamics
