季戊四醇废渣中二季戊四醇结晶分离研究  

Crystallization separation process of dipentaerythritol from the pentaerythritol residue

作　　者：喻仕瑞 陈天祥[2] YU Shi-rui;CHEN Tian-xiang(Department of Food Science and Technology,Moutai College,Renhuai 564500,Guizhou Province,China;School of Chemistl？~-and Chemical Engineering,Guizhou University,Guiyang 550025,Guizhou Province,China)

机构地区：[1]茅台学院食品科学与工程系,贵州仁怀564500 [2]贵州大学化学与化工学院,贵州贵阳550025

出　　处：《化学工程》2018年第8期33-37,共5页Chemical Engineering(China)

摘　　要：采用结晶分离法对工业季戊四醇废渣中高附加值二季戊四醇进行分离,回收季戊四醇。文中用综合法对季戊四醇和二季戊四醇水溶液结晶热力学和用筛分法进行反应液结晶动力学性质试验研究,制定结晶分离提纯方案。结果表明:随着温度升高,二季戊四醇的过饱和度增幅小于季戊四醇;反应液中二季戊四醇、季戊四醇成核速率比值为6.51;晶核密度比值为32.90;晶体单向生长速率比值为0.2。结合反应液组分性质,设计了结晶耦合其他分离技术工艺路线,获得纯度为85%二季戊四醇和95%季戊四醇。Separating dipentaerythritol from pentaerythritol residue was discussed by crystallization separation process. High value-added dipentaerythritol can be obtained, and the pentaerythritol can be recycled from pentaerythritol residue. The crystallization thermodynamics by synthetic method and kinetics by wet-sieving method were studied in reaction solution. The thermodynamics results show that the growth of super saturation of pentaerythritol is higher than that of dipentaerythritol with the increasing of temperature. Crystallization kinetics data indicates that the nucleation ratio of dipentaerythritol and pentaerythritol was 6. 51,and the ratio of nucleus density was 32. 90,and the ratio of crystal unidirectional growth rate was 0. 2. Depending on differences of the ingredients property,the experimental scheme which crystal coupling other separation technology was designed to separate dipentaerythritol and recycle pentaerythritol in pentaerythritol residue. The purity of dipentaerythritol and pentaerythritol reaches 85% and 95%,respectively.

关 键 词：季戊四醇 二季戊四醇 结晶 热力学 动力学 

分 类 号：TQ021.4[化学工程] TQ013