Solid-liquid Equilibria in the Quaternary System Na+, K+//Br-, B4O72--H2O at 298 K

doi:10.1007/s40242-014-4026-x

Chemical Research in Chinese Universities ›› 2014, Vol. 30 ›› Issue (5): 844-847.doi: 10.1007/s40242-014-4026-x

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Solid-liquid Equilibria in the Quaternary System Na⁺, K⁺//Br^-, B₄O₇^2--H₂O at 298 K

CUI Ruizhi^1,2, SANG Shihua^1,2, LIU Qingzhu^1,2, WANG Pan^1,2

1. College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, Chengdu 610059, P. R. China;
2. Mineral Resources Chemistry Key Laboratory ofSichuan Higher Education Institutions, Chengdu 610059, P. R. China

Received:2014-01-20 Revised:2014-04-01 Online:2014-10-01 Published:2014-05-12
Contact: SANG Shihua E-mail:sangsh@cdut.edu.cn
Supported by:
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).

Abstract

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.

Key words: Underground brine, Phase equilibrium, Solubility, Potassium salt, Borate, Bromide

CUI Ruizhi, SANG Shihua, LIU Qingzhu, WANG Pan. Solid-liquid Equilibria in the Quaternary System Na⁺, K⁺//Br^-, B₄O₇^2--H₂O at 298 K[J]. Chemical Research in Chinese Universities, 2014, 30(5): 844-847.

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Solid-liquid Equilibria in the Quaternary System Na⁺, K⁺//Br^-, B₄O₇^2--H₂O at 298 K

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