NaCl-KCl-Na2SiO3四元盐水体系溶解度研究  

Study on solubility of NaCl-KCl-Na2SiO3-H2O quaternary system

作　　者：李桂亮[1] 李长俊[1] 陈秀玲 班久庆 LI Gui-liang;LI Chang-jun;CHEN Xiu-ling;BAN Jiu-qing(College of Petroleum and Natural Gas Engineering,Southwest Petroleum University,Chengdu 610500,Sichuan Province,China;PetroChina Changqing Oilfield Company Third Gas Production Plant,Ordos 017000,Inner Mongolia,China)

机构地区：[1]西南石油大学石油与天然气工程学院,四川成都610500 [2]中国石油天然气股份有限公司长庆油田分公司第三采气厂,内蒙古鄂尔多斯017000

出　　处：《化学工程》2020年第2期37-41,68,共6页Chemical Engineering(China)

摘　　要：为计算NaCl-KCl-Na2SiO3-H2O中离子溶解度,基于Bromley电解质模型,以NaCl为研究对象建立四元盐水溶解平衡模型,克服了硅酸盐因反应复杂,溶解平衡常数难以计算的问题,并对所收集实验数据,采用最小二乘法得出该模型所需、考虑温度变化的Na^+-Cl^-、Na^+-K^+、K^+-Cl^-、Na^+-SiO3^2-、Cl^--SiO3^2-二元相互作用系数函数。结果表明:相对于实验数据,本文模型平均绝对误差为5.1%,较Zeng方法准确度提升32%,表现出更好的准确性,以及升温、减小Na^+浓度、增大K^+浓度,可提高SiO3^2-溶解度。由此,文中模型可用于NaCl-KCl-Na2SiO3水溶液的离子浓度计算及影响因素分析,并为成分更复杂的硅酸盐水溶液以及溶解平衡常数不易获得的盐水体系,提供一种构建溶解平衡模型的新思路。In order to calculate the ion solubility in NaCl-KCl-Na2SiO3-H2O quaternary system,a phase equilibrium model was built based on Bromley electrolyte model with NaCl as the research object,which solved the problem of being difficult to calculate the equilibrium constant of silicate for its complicated reaction.Based on the experimental data collected,the least square solution was adopted to get the binary interaction coefficient function of Na^+-Cl^-,Na^+-K^+,K^+-Cl^-,Na^+-SiO3^2-,Cl^--SiO3^2- required by this model that also took into account temperature variation.The results show that comparing with experimental data,the mean absolute error of the model is 5.1%,and its accuracy is 32% higher than that of the Zeng Method,showing better precision.With the model in this paper,the solubility of silicate ion can be improved by temperature rise,reducing Na^+ concentration or increasing K^+ concentration.In consequence,the model can be used for calculating the ion concentration of NaCl-KCl-Na2SiO3 aqueous solution and analyzing its influence factors.It can also provide a new thought for building dissolution equilibrium model specific to silicate aqueous solution with more complicated constituents and saline system whose dissolution equilibrium constant is difficult to get.

关 键 词：硅酸盐 溶解平衡常数 电解质模型 二元离子相互作用系数 NACL 

分 类 号：TQ110.9[化学工程—无机化工]