Phase equilibria of quaternary system NaCl-NaBr-Na₂B₄O₇-H₂O at 348 K

Abstract

The phase equilibria of quaternary system NaCl-NaBr-Na₂B₄O₇-H₂O at 348 K were studied by the isothermal equilibrium method. The solubilities and densities of the equilibrium solution were determined. According to the experimental data, the phase diagram, density-composition diagrams and water content diagram of the quaternary system at 348 K were plotted respectively. And the phase diagram consists of one univariant curve, two crystallization fields and without any invariant point of the quaternary system. The equilibrium solid phases of the two crystallization fields were Na(Cl, Br) and Na₂B₄O₇·5H₂O. The experimental results show that the quaternary system contained solid solution. The densities of the solution decrease with increasing NaCl concentration and increase with increasing NaBr concentration.

Keywords

Solid solution / Phase equilibrium / Solubility / Salt-water system

References

[1] Sun B., Li B., Fang C. H., Du X. H., Song P. S. Journal of Salt Lake Research, 1995, 3(4): 50.

[2] Abderrahim D., Abdelfetah M. Journal of Solution Chemistry, 2003, 32(5): 395.

[3] Sang S. H., Zhang Z. L., Li M. Chem. Res. Chinese Universities, 2009, 25(5): 740.

[4] Huang X. L., Wang X. F., Chen L. J. Chem. J. Chinese Universities, 2011, 32(6): 1378.

[5] Zeng Y., Yin H. A., Tang M. L., Feng X. X. Chem. J. Chinese Universities, 2003, 24(6): 968.

[6] Sang S. H., Peng J., Wei L. N. Acta Phys.-Chim. Sin., 2009, 25(2): 331.

[7] Wang R. L., Zeng Y. Chem. Res. Chinese Universities, 2010, 26(1): 114.

[8] Li D., Meng L. Z., Guo Y. F., Deng T. L., Chemical World, 2011, (9), 565.

[9] Qui D., Ren B. S. Journal of Hebei University of Technology, 2002, 31(2): 32.

[10] Cao J. L., Zhang Y. J., Ji Z. Y., Wang J. Journal of Hebei University of Technology, 2002, 31(3): 14.

[11] Weng Y. B., Wang Y. F., Wang J. K., Yin Q. X. Journal of Chemical Engineering of Chinese Universities, 2007, 21(4): 695.

[12] Weng Y. B., Wang J. K., Yin Q. X., Wang Y. F. Petrochemical Technology, 2007, 36(4): 358.

[13] Weng Y. B. Study on Phase Equilibria of the Quinary System Na ⁺, K ⁺, Mg ²⁺//Cl ⁻, Br ⁻-H ₂ O at 313 K, 2008, Tianjin: Tianjin University.

[14] Wang D., Sang S. H., Zeng X. X., Ning H. Y. Petrochemical Technology, 2011, 36(4): 285.

[15] Charykova M. V., Charykov N. A. Geochemistry International, 2007, 45(10): 1040.

[16] Lin Y. T. Journal of Salt Lake Research, 2001, 9(2): 56.