五元体系NaBr-KBr-MgBr_(2)-CaBr_(2)-H_(2)O在298.15 K下的空间立体相图研究  

Studies on three-dimensional phase diagram of the quinary system NaBr-KBr-MgBr_(2)-CaBr_(2)-H_(2)O at 298.15 K

作　　者：彭昌炜 桑世华[1] 崔瑞芝[2,3] 任红保 PENG Changwei;SANG Shihua;CUI Ruizhi;REN Hongbao(College of Materials and Chemistry&Chemical Engineering,Chengdu University of Technology,Chengdu 610059,Sichuan,China;Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources,Qinghai Institute of Salt Lakes,Chinese Academy of Sciences,Xining 810008,Qinghai,China;Key Laboratory of Salt Lake Resources Chemistry of Qinghai Province,Xining 810008,Qinghai,China)

机构地区：[1]成都理工大学材料与化学化工学院,四川成都610059 [2]中国科学院青海盐湖研究所盐湖资源综合高效利用重点实验室,青海西宁810008 [3]青海省盐湖资源化学重点实验室,青海西宁810008

出　　处：《化工学报》2022年第11期4850-4858,共9页CIESC Journal

基　　金：国家自然科学基金项目(41873071);青海省盐湖资源化学重点实验室创新建设平台专项(2022-ZJ-Y06)。

摘　　要：为合理开发四川盆地富溴地下卤水资源,对五元体系NaBr-KBr-MgBr_(2)-CaBr_(2)-H_(2)O进行了298.15 K条件下完整的相平衡与相图的研究。根据实验测定的溶解度数据,绘制出了完整的空间立体相图,NaBr·2H_(2)O、MgBr_(2)·6H_(2)O和CaBr_(2)·6H_(2)O三种盐饱和面的干基投影相图,以及相应的含水量图。研究结果表明该五元体系在298.15 K下的空间立体相图中包含有十条单变量曲线、三个共饱点和六个结晶区(KBr结晶区、NaBr结晶区、NaBr·2H_(2)O结晶区、MgBr_(2)·6H_(2)O结晶区、CaBr_(2)·6H_(2)O结晶区、KBr·MgBr_(2)·6H_(2)O结晶区)。其中KBr结晶区最大,CaBr_(2)·6H_(2)O结晶区最小,表明在该体系中CaBr_(2)·6H_(2)O的溶解度最大,KBr溶解度最小。In order to rationally develop the bromine-rich underground brine resources in the Sichuan Basin,the complete phase equilibria and phase diagram of the quinary system NaBr-KBr-MgBr_(2)-CaBr_(2)-H_(2)O at 298.15 K were studied.According to the solubility data measured in the experiment,a complete three-dimensional phase diagram,as well as the dry basis projected phase diagrams of the saturation surface with NaBr·2H_(2)O,MgBr_(2)·6H_(2)O and CaBr_(2)·6H_(2)O were plotted respectively,and the corresponding water content diagrams were drawn respectively.The results show that the phase diagram of the quinary system at 298.15 K contains ten univariate curves,three invariant points and six crystallization regions(KBr crystallization region,NaBr crystallization region,NaBr·2H_(2)O crystallization region,MgBr_(2)·6H_(2)O crystallization region,CaBr_(2)·6H_(2)O crystallization region,KBr·MgBr_(2)·6H_(2)O crystallization region).The KBr crystallization region is the largest and the CaBr_(2)·6H_(2)O crystallization region is the smallest,which indicates that the solubility of CaBr_(2)·6H_(2)O is the largest and the KBr solubility is the smallest in this system.

关 键 词：相图 溴化物 地下卤水 相平衡 

分 类 号：TQ028.8[化学工程]