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2012年 第6卷 第3期

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《化学科学与工程前沿（英文）》 >> 2012年 第6卷 第3期 doi: 10.1007/s11705-012-1206-4

Investigations on dehydration processes of trisodium citrate hydrates

The State Research Center of Industrialization for Crystallization Technology, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China

发布日期： 2012-09-05
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摘要

The dehydration processes of trisodium citrate (Na C H O ) 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.

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