高等学校化学学报 ›› 2022, Vol. 43 ›› Issue (3): 20210727.doi: 10.7503/cjcu20210727

• 物理化学 • 上一篇    下一篇

LiCl-NaCl-KCl-H2O溶液体系渗透压的分子动力学模拟

陈瀚翔1,2,3, 边绍菊1,2, 胡斌1,2(), 李武1,2   

  1. 1.中国科学院青海盐湖研究所, 中国科学院盐湖资源综合高效利用重点实验室, 西宁 810008
    2.青海省盐湖资源化学重点实验室, 西宁 810008
    3.中国科学院大学, 北京 100049
  • 收稿日期:2021-10-19 出版日期:2022-03-10 发布日期:2022-01-07
  • 通讯作者: 胡斌 E-mail:hubin@isl.ac.cn
  • 基金资助:
    中国科学院国际伙伴计划项目(122363KYSB20190033);青海省自然科学基金(2019-ZJ- 958Q)

Molecular Simulation of the Osmotic Pressures for LiCl-NaCl-KCl-H2O Solution System

CHEN Hanxiang1,2,3, BIAN Shaoju1,2, HU Bin1,2(), LI Wu1,2   

  1. 1.Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resource,Qinghai Institute of Salt Lakes,Chinese Academy of Sciences,Xining 810008,China
    2.Qinghai Provincial Key Laboratory of Resources and Chemistry of Salt Lakes,Xining 810008,China
    3.University of Chinese Academy of Sciences,Beijing 100049,China
  • Received:2021-10-19 Online:2022-03-10 Published:2022-01-07
  • Contact: HU Bin E-mail:hubin@isl.ac.cn
  • Supported by:
    the International Partnership Program of Chinese Academy of Sciences(122363KYSB20190033);the Natural Science Foundation of Qinghai Province, China(2019-ZJ-958Q)

摘要:

盐湖卤水中含有大量的锂、 钾资源, 发展卤水的渗透压预测模型和方法, 对于资源的综合利用具有重要的指导意义. 本文采用分子动力学(MD)方法结合水溶液渗透压模拟(OPAS)技术, 研究了LiCl-NaCl-KCl-H2O体系的渗透压模拟方法, 计算了298.15 K下体系多种组成和浓度的渗透压, 并将计算结果与实验值和Pitzer模型计算值进行了对比. 结果显示, 模拟计算值与实验值和Pitzer模型计算值渗透压的趋势基本一致, 包括同种溶液不同浓度和同浓度不同溶液之间的渗透压关系. 该方法可以应用于多元混合物体系对渗透压进行定性和半定量的计算.

关键词: 水盐混合溶液体系, 渗透压, 分子动力学

Abstract:

Salt Lake Brines contain large amount of lithium and potassium resources. Developing models and methods that predicts the osmotic pressures of brines shows significance in utilizing salt lake resources. Molecular dynamics(MD) technology equipped with osmotic pressure in aqueous solutions(OPAS) method were applied to study the prediction of osmotic pressures of LiCl-NaCl-KCl-H2O solution system. The computed results were compared with experimental and Pitzer model calculated data, and the data includes osmotic pressures of solutions of the same type and different concentrations and of the same concentration and different types. The results show that this approach is capable to calculated the osmotic pressures quantitively and semi-qualitatively for complex mixture systems.

Key words: Mixed salt solution system, Osmotic pressure, Molecular dynamics

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