The Studying Of Integral Equation Theories For Aqueous Electrolyte Solution

Aqueous electrolyte solution exists in natural gas purification, wastewater treatment, salt distillation, biological engineering and hydrometallurgical separation and other chemical industries widely. At present, the thermodynamic properties of electrolyte solution remained in the research associated with the basis of experience. In a variety of statistical mechanics theory, integral equation theory and perturbation theory have been systematically studied. Integral equation theory or super-network MSA chain approximation method has been widely used to obtain the structure of fluid nature and thermodynamics. Its main tasks are to:1,We use the renormalization group method to deal with long-range electrostatic interaction, meeting the electrostatic convergence requirement of the integral equation. We obtained radial distribution function between the various ions, and achieve a good agreement with molecular simulation data.2,We introduce a new closure equation, that is, the improved HNC approximation. It contains the information of the bridge function, so can get more accurate results.3,We considerate the dielectric properties and the hydrogen bonding association of water for the electrolyte solution, establish a new potential energy function of the electrolyte solution. Then, We calculate the osmotic coefficient of the electrolyte solution, the calculation results are coincided with the experimental data.4,We combine the electrolyte integral equation theory and the renormalization group theory to study charged colloidal vapor - liquid equilibrium and critical nature. The calculation results show that a certain range of the shielding coefficient coincide with the simulation results show that the method can correctly describe the overall vapor - liquid behavior of the charged colloid.