无水硫酸钠结晶热力学及介稳区宽度研究  

Research of Crystallization Thermodynamics and Metastable Zone Width of Anhydrous Sodium Sulfate

作　　者：曾桂生[1] 李慧[1] 王贤勇[1] 

机构地区：[1]南昌航空大学,江西南昌330063

出　　处：《南昌航空大学学报（自然科学版）》2012年第4期66-70,共5页Journal of Nanchang Hangkong University(Natural Sciences)

基　　金：国家自然科学基金(51266011);国家高技术研究发展计划(2010AA065204)

摘　　要：通过研究无水硫酸钠的结晶热力学特性,采用平衡法测定了硫酸钠的溶解度数据和超溶解度数据,确定了硫酸钠溶液的结晶介稳区,考察了不同降温速率和不同搅拌转速对硫酸钠结晶介稳区宽度的影响;根据经典成核理论,推算出硫酸钠的成核级数、成核方程式以及降温结晶的表面熵因子。实验结果表明,随着温度的升高,硫酸钠溶解度不断增加之后增幅有减小趋势,且变化缓慢;介稳区宽度随着温度的升高而逐渐变宽,随着降温速率的减小而变窄;降低搅拌转速会使介稳区宽度变宽。The crystallization thermodynamics of sodium sulfate was investigated. The solubility and ultra - solubility of sodium sulfate were measured with balance method to determine Metastable Zone Width （MSZW）. The effect of different cooling rate and agitating rate on MSZW were also investigated. The nuclear equation and nucleation order of sodium sulfate as a function of supersaturation were found using the classical nucleation theory based approach of Nyvlt. Surface entropy factor was obtained under cooling crystallization. Experimental results show that the solubility increases with the increase of temperature. When the temperature continues to rise, there is a slow downward trend. MSZW becomes wider with the increase of cooling rate and becomes wider with the decrease of agitating rate.

关 键 词：无水硫酸钠 结晶 溶解度 介稳区 成核级数 表面熵因子 

分 类 号：X756[环境科学与工程—环境工程]