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Phase Equilibria, Critical Phenomena, and Extractive Crystallization of the Salt in the Sodium Chloride–Water–Diisopropylamine Ternary System
Russian Journal of Inorganic Chemistry ( IF 2.1 ) Pub Date : 2021-06-29 , DOI: 10.1134/s0036023621060073
D. G. Cherkasov , V. V. Danilina , K. K. Il’in

Abstract

Extractive crystallization is a promising method for preparing salts from their aqueous solutions. It is topical to carry out extractive crystallization so that reuse the solvent. One aim of our study was to find optimal conditions for the extractive crystallization of sodium chloride via studying phase equilibria and critical phenomena in the sodium chloride–water–diisopropylamine ternary system in the range 10.0–90.0°C. One more aim was to decide whether sodium chloride is useful for salting-out diisopropylamine from its aqueous solutions. The water–diisopropylamine system has a lower critical solution temperature (27.3°C). The phase-transition temperatures were evaluated by the visual polythermal method, and polythermal phase diagrams of mixtures of ternary system’s components were plotted. Temperature dependences of the critical solution composition and the distribution coefficient (Kd) of diisopropylamine between the aqueous and organic monotectic phases were elucidated. The maximum value of Kd (480) was reached at 90.0°С. The yield of NaCl crystals was found to increase with increasing amine concentration in the ternary mixtures. The highest sodium chloride yield (49%) from a water–salt solution containing 26 wt % salt was observed at 27.3°С after 90.0 wt % diisopropylamine was added.



中文翻译:

氯化钠-水-二异丙胺三元体系中盐的相平衡、临界现象和萃取结晶

摘要

萃取结晶是一种从水溶液制备盐的有前途的方法。局部进行萃取结晶以便重复使用溶剂。我们研究的目的之一是通过研究氯化钠-水-二异丙胺三元体系中 10.0-90.0°C 的相平衡和临界现象,找到氯化钠萃取结晶的最佳条件。另一个目的是确定氯化钠是否可用于从水溶液中盐析二异丙胺。水-二异丙胺体系具有较低的临界溶解温度 (27.3°C)。采用目视多热法测定相变温度,绘制了三元体系组分混合物的多热相图。阐明了水相和有机单晶相之间的二异丙胺的K d )。K d (480)的最大值在 90.0°С 达到。发现 NaCl 晶体的产量随着三元混合物中胺浓度的增加而增加。在添加 90.0 wt % 二异丙胺后,在 27.3°С 时观察到含有 26 wt % 盐的水-盐溶液的最高氯化钠产率 (49%)。

更新日期:2021-06-29
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