Investigations on dehydration processes of trisodium citrate hydrates

doi:10.1007/s11705-012-1206-4

Front Chem Sci Eng

2012, Vol. 6

Issue (3) : 276-281 https://doi.org/10.1007/s11705-012-1206-4

RESEARCH ARTICLE

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

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Abstract

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.

Keywords trisodium citrate dehydration TG/DSC PXRD

Corresponding Author(s): HAO Hongxun,Email:hhx73@hotmail.com

Issue Date: 05 September 2012

Cite this article:

Yanlei WANG,Hongxun HAO,Junyan GAO. Investigations on dehydration processes of trisodium citrate hydrates[J]. Front Chem Sci Eng, 2012, 6(3): 276-281.

URL:

https://academic.hep.com.cn/fcse/EN/10.1007/s11705-012-1206-4
https://academic.hep.com.cn/fcse/EN/Y2012/V6/I3/276

Fig.1 (a) Crystal structure of TC dihydrate; (b) Crystal structure of TC pentahydrate

Fig.2 (a1, b1) The PXRD patterns for TC dihydrate and TC pentahydrate; (a2, b2) The PXRD patterns simulated from single crystal X-ray data of the two hydrates

Fig.3 TG/DSC profile of TC dihydrate

Fig.4 PXRD profile for TC dihydrate and its dehydration product at 473K

Fig.5 TG/DSC profile for TC pentahydrate

Fig.6 PXRD profile for TC dihydrate and the dehydration product of TC pentahydrate at 403K

Fig.7 Ozawa plots for the first step dehydration of TC pentahydrate and the dehydration of TC dihydrate at heating rate of 2.5 K·min, 5 K·min, 7.5 K·min, 10 K·min

Tab.1 Activation energies of the first step dehydration of TC pentahydrate and the dehydration of TC dihydrate

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