摘要
冷冻共晶技术的最大特点是冰晶和固体盐同时结晶析出,介稳区的测定是冷冻共晶操作的关键研究之一。文中采用静态法测定了谷氨酸钠在0℃以下的溶解度。实验结果表明:随着温度的降低,谷氨酸钠的溶解度降低。利用FBRM,PVM在线监测系统测定了谷氨酸钠在不同的搅拌速率、降温速率、晶种加入量条件下的超溶解度。根据溶解度和超溶解度曲线,确定了谷氨酸钠的介稳区宽度。研究表明:在一定条件下,搅拌速率越小、降温速率越快、加入晶种量越多,谷氨酸钠介稳区越宽。测定的介稳区数据为后续谷氨酸钠冷冻共结晶实验打下基础。
The biggest feature of the freezing eutectic technology is the simultaneous crystallization of ice crystals and solid salts. Determination of metastable zone is one of the key studies in the operation of freezing eutectic. The solubility of sodium glutamate at different temperatures （ under 0℃ ） was measured by static method. The results show that the solubility of sodium glutamate reduces with the decrease of temperature. The supersolubility of monosodium glutamate at different stirring rate, cooling rate, seed amount was determined by using FBRM and PVM online monitoring system. According to the solubility and supersolubility curve, the metastable zone width of monosodium glutamate was determined. Research shows that, under certain conditions, the smaller the stirring rate, the slower the cooling rate, the more the amount of added seed, the wider the metastable zone width of sodium glutamate is. The metastable zone data lay a foundation for the subsequent determination of sodium glutamate＇s eutectic freezing experiment.
出处
《化学工程》
CAS
CSCD
北大核心
2017年第10期33-36,40,共5页
Chemical Engineering(China)
关键词
冷冻共晶
溶解度
超溶解度
介稳区
eutectic freezing crystallization
solubility
supersolubility
metastable zone
