2,4-甲苯二异氰酸酯结晶过程的过冷度和相平衡图  

Undercooling Degree and Phase Diagram of 2,4-Diisocyanate Crystallization Process

作　　者：杨博 程华农[1] 李晓明 付振波 郑世清[1] YANG Bo;CHENG Huanong;LI Xiaoming;FU Zhenbo;ZHENG Shiqing(Center of Computer and Chemical Engineering,Qingdao University of Science and Technology,Qingdao 266042,China;Gansu Yinguang Chemical Industry Group Co.,Ltd,Baiyin 730900,China)

机构地区：[1]青岛科技大学计算机与化工研究所,山东青岛266042 [2]甘肃银光化学工业集团有限公司,甘肃白银730900

出　　处：《青岛科技大学学报（自然科学版）》2020年第3期21-27,共7页Journal of Qingdao University of Science and Technology:Natural Science Edition

基　　金：山东省重点研发计划项目(GG201710020010).

摘　　要：工业上2,4-甲苯二异氰酸酯的生产主要通过结晶方法来实现,过冷度和相平衡图对结晶工艺和设备的设计起到重要作用。以工业生产的甲苯二异氰酸酯为原料制备了不同2,4-甲苯二异氰酸酯含量的熔融液,采用冷却曲线法测定了过冷度并绘制了相图。结果表明:降温速率越快时,过冷度越小,但当降温速度小于4℃·h^-1时,过冷度变化不大;搅拌速率越大时过冷度越大,但当搅拌速度大于400 r·min^-1时过冷度不再变化。分别采用Wilson方程、NRTL模型及UNIFAC基团法对相平衡实验数据进行回归。相比其它方法,UNIFAC基团法对相平衡计算具有更高的精度。In the industrial process,the production of 2,4-tolylene diisocyanate is mainly performed with crystallization method.Undercooling degree and phase diagram play an important role in the design of crystallization process and equipment.The melting solution of different 2,4-tolylene diisocyanate contents was prepared from industrial diisocyanate.The undercooling degree of toluene diisocyanate with different isomer ratio was measured by cooling curve method and the phase diagram was drawn.The faster the cooling rate,the smaller the undercooling degree was.When cooling speed was less than 4℃·h^-1,undercooling degree changed little.The higher the stirring rate,the higher the undercooling degree was.The undercooling degree was change when the stirring speed was more than 400 r·min^-1.The experimental data were regressed by Wilson,NRTL and UNIFAC equations.Compared with other methods,UNIFAC equation had higher accuracy in phase equilibrium calculation.

关 键 词：2 4-甲苯二异氰酸酯 结晶 过冷度 相平衡 模型 

分 类 号：O792[理学—晶体学]