含锶油田水体系热力学和相平衡研究I.Sr,Na,K,Li//Cl-H2O体系

Thermodynamics and Phase Equilibria of the Oil Field Brine with Sr System at 25 ℃ I.Sr,Na,K,Li//Cl-H2O system 

中文关键词:  Pitzer模型  热力学  相平衡  油田水  氯化锶

英文关键词:Pitzer ion interaction model  Thermodynamics  Phase equilibrium  Oil-field brine  Strontium chloride

中文摘要:

      柴达木盆地西部南翼山地区的油田水,是富含钾、硼、锂、碘等多种有用成分的液体矿产资源,水中含有高浓度的锶,世界罕见。该油田水储量巨大,自喷,是我国超大型的特色资源。其卤水组成可用Li⁺,Na⁺,K⁺,Sr²⁺,Ca²⁺//Cl--H₂O表示。本次工作对这一体系的相平衡和热力学开展研究。对低组分相平衡关系准确测定后,结合溶液热力学研究结果,经处理最终建立了体系25℃的Pitzer热力学模型,进而利用该模型,进行了多个未知的多组分体系溶解度预测。作为首次报道,介绍针对这一复杂六元体系中所包含的Li⁺,Na⁺,K⁺,Sr²⁺//Cl--H₂O五元体系的研究结果。

英文摘要:

      :The Oil-field brines in Nanyishan area, in Qaidam basin, Qinghai are abundant liquid mineral resources with high concentrations of lithium, potassium, boron,iodine etc.Especially, extremely high content of strontium in these brines is unique in the world. Compositions of brines can mostly be presented by Li⁺,Na⁺,K⁺,Sr²⁺,Ca²⁺/Cl--H₂O system. It is different from the classic sea water system, nitrate system, and ‘salt lake brine’ system. The phase equilibrium and solution thermodynamic properties of the system have been studied in our lab.The obtained new data with others in chemical literature were treated together to get parameters needed for Pitzer thermodynamic model of electrolyte solution. The predicted phase equilibrium of systems containing Sr²⁺and Li⁺ at 25 ℃ were made by using the model. Solubility data and phase diagrams were presented as an example to illustrate the applicability and reliability of the model.