Phase equilibria in quaternary system Na+,K+//Br-,SO42--H2O at 373 K

doi:10.11949/j.issn.0438-1157.20151183

Abstract

Abstract:

According to the composition of the brine resources in the west of Sichuan Basin, phase equilibria in the quaternary system Na⁺,K⁺//Br^-,SO₄^2--H₂O at 373 K is measured by the isothermal solution saturation method, and the solubilities and densities of the solution are determined experimentally. Using the experimental results, the dry salt phase diagram, water diagram and the densities versus composition diagram are obtained. In the phase diagram of quaternary system Na⁺,K⁺//Br^-,SO₄^2--H₂O at 373 K, the double salt Na₂SO₄·3K₂SO₄ is found. There are three invariant points, seven uninvariant curves and five crystallization fields in the quaternary system. The five crystallization fields correspond to NaBr, Na₂SO₄, K₂SO₄, KBr and Na₂SO₄·3K₂SO₄(Gla), respectively. The crystallization field of NaBr has the smallest crystallization area, whereas the double salt Na₂SO₄·3K₂SO₄(Gla) has the biggest crystallization field in the quaternary system. It means that the double salt Na₂SO₄·3K₂SO₄(Gla) has the smaller solubility, and it can be easiest separated from solution. Compared with the two phase diagrams of quaternary system Na⁺,K⁺//Br^-,SO₄^2--H₂O at 323 K and 373 K, the result shows that the numbers of invariant points, crystallization fields and unvariant curves are the same. The double salt all forms in the phase diagrams of quaternary systems at two different temperatures. But univariant curve GH of the corresponding balance solid phase is different and the crystal water of sodium bromide has disappeared at 373 K. In comparison with the quaternary system Na⁺,K⁺//Cl^-,SO₄^2--H₂O and the quaternary system Na⁺,K⁺//Br^-,SO₄^2--H₂O at 373 K, the two phase diagrams have very similar shapes, each of them having three invariant points, seven univariant curves and five crystallization fields. The crystallization field of the salt NaBr is apparently smaller than that of NaCl. It is also found that halide has the salting-out effect on sulfates. The water content and the density transformation rules are discussed simply. The water content is lower with the higher solution of bromine and the density is higher with the higher solution of bromine.

Key words: underground brine, phase equilibria, solubility, solution, potassium salt, bromine salt

摘要：

采用等温溶解平衡法研究了四元体系Na⁺,K⁺//Br^-,SO₄^2--H₂O在373 K条件下的相平衡关系,测定了平衡溶液的溶解度和密度,并根据实验数据绘制相应的相图、水图和密度图。研究发现:交互四元体系Na⁺,K⁺//Br^-,SO₄^2--H₂O在373 K温度下,有复盐钾芒硝Na₂SO₄·3K₂SO₄生成,相图由3个共饱和点、7条单变量曲线和5个结晶区组成。其中,5个结晶区分别对应单盐:K₂SO₄,KBr,NaBr,Na₂SO₄和复盐Na₂SO₄·3K₂SO₄(Gla)。

关键词: 地下卤水, 相平衡, 溶解性, 溶液, 钾盐, 溴盐

CLC Number:

O642

CUI Ruizhi, SANG Shihua. Phase equilibria in quaternary system Na⁺,K⁺//Br^-,SO₄²^--H₂O at 373 K[J]. CIESC Journal, 2016, 67(4): 1123-1128.

崔瑞芝, 桑世华. 四元体系Na⁺,K⁺//Br^-,SO₄²^--H₂O373K相平衡[J]. 化工学报, 2016, 67(4): 1123-1128.

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Phase equilibria in quaternary system Na⁺,K⁺//Br^-,SO₄²^--H₂O at 373 K

四元体系Na⁺,K⁺//Br^-,SO₄²^--H₂O373K相平衡

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