Investigations on dehydration processes of trisodium citrate hydrates

被引：25

作者：

Junyan Gao

Yanlei Wang

Hongxun Hao

机构：

[1] The State Research Center of Industrialization for Crystallization Technology, School of Chemical Engineering and Technology, Tianjin University

来源：

Frontiers of Chemical Science and Engineering | 2012年 / 6卷 / 3期

关键词：

dehydration; PXRD; TG/DSC; trisodium citrate;

D O I：

10.1007/s11705-012-1206-4

中图分类号：

学科分类号：

摘要：

The dehydration processes of trisodium citrate (Na 3C 6H 5O 7) hydrates were investigated using thermogravimetry (TG), differential scanning calorimetry (DSC) and powder X-ray diffraction (PXRD). It was found that the temperature of dehydration of trisodium citrate dihydrate was at 430.99 K. For trisodium citrate pentahydrate, there is a two-step dehydration process and the endothermal peaks appear at 337.23 K and 433.83 K, respectively. During the first step of dehydration process, the structure of trisodium citrate pentahydrate changed into the structure of trisodium citrate dihydrate. In addition, the kinetics of dehydration for trisoidum citrate hydrates was also investigated using TG data. According to the activation energies of dehydration calculated by Ozawa equation, it was found that the dehydration mechanisms of the two hydrates were different. © 2012 Higher Education Press and Springer-Verlag Berlin Heidelberg.

引用

页码：276 / 281

页数：5

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