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Solid-liquid equilibria in the quaternary system Na+, K+//Br−, B4O7 2−-H2O at 298 K

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Abstract

According to the compositions of the underground gasfield brines in the west of Sichuan Basin, the solubilities and densities of the solid-liquid equilibria in the quaternary system Na+, K+//Br−, B4O7 2−-H2O at 298 K were determined by the method of isothermal solution saturation. From the experimental data, the phase diagram, water content diagram and density-composition diagram were obtained. This quaternary system is of simple eutectic type, without double salt and solid solution. There are two invariant points, five univariant curves, four fields of crystallization in the system. The equilibrium solid phases are Na2B4O7·10H2O, K2B4O7·4H2O, NaBr·2H2O and KBr. Na2B4O7·10H2O has a larger crystallization field, and NaBr·2H2O has a smaller crystallization field. It is also found that bromide has the salting-out effect on borate in the quaternary system Na+, K+//Br−, B4O7 2−-H2O at 298 K.

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Authors and Affiliations

  1. College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, Chengdu, 610059, P. R. China

    Ruizhi Cui, Shihua Sang, Qingzhu Liu & Pan Wang

  2. Mineral Resources Chemistry Key Laboratory of Sichuan Higher Education Institutions, Chengdu, 610059, P. R. China

    Ruizhi Cui, Shihua Sang, Qingzhu Liu & Pan Wang

Authors
  1. Ruizhi Cui
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  2. Shihua Sang
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  3. Qingzhu Liu
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  4. Pan Wang
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Corresponding author

Correspondence to Shihua Sang.

Additional information

Supported by the National Natural Science Foundation of China(No.41373062), the Specialized Research Fund for the Doctoral Program of Higher Education of China(No.20125122110015), the Fund of Mineral Resources Chemistry Key Laboratory of Sichuan Higher Education Institutions, China(No.kzh201101) and the Fund of Key Laboratory of Salt Lake Resources and Chemistry, China(No.KLSLRC-KF-13-DX-1).

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Cui, R., Sang, S., Liu, Q. et al. Solid-liquid equilibria in the quaternary system Na+, K+//Br−, B4O7 2−-H2O at 298 K. Chem. Res. Chin. Univ. 30, 844–847 (2014). https://doi.org/10.1007/s40242-014-4026-x

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  • DOI: https://doi.org/10.1007/s40242-014-4026-x

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