Investigations on dehydration processes of trisodium citrate hydrates
Investigations on dehydration processes of trisodium citrate hydrates
Junyan GAO, Yanlei WANG, Hongxun HAO()
The State Research Center of Industrialization for Crystallization Technology, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
The dehydration processes of trisodium citrate (Na3C6H5O7) 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.
. Investigations on dehydration processes of trisodium citrate hydrates[J]. Frontiers of Chemical Science and Engineering, 2012, 6(3): 276-281.
Junyan GAO, Yanlei WANG, Hongxun HAO. Investigations on dehydration processes of trisodium citrate hydrates. Front Chem Sci Eng, 2012, 6(3): 276-281.
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