Correlations for Densities of Aqueous Electrolyte Solutions

Abstract

We present simple %-level accuracy universal correlations for densities of aqueous electrolyte solutions at 298.15 K and 0.1 MPa. The developed expressions and parameters are based on 1032 experimental density data points for 56 aqueous single electrolyte solutions including chlorides, bromides, iodides, bicarbonates, carbonates, sulfates, nitrates, nitrites, phosphates, hydrogen phosphates, and dihydrogen phosphates. The correlations relate the solution density with "excess" mass fraction of electrolytes in solution. With molar mass and concentrations of electrolytes as input, the correlation yields density results for all 56 electrolytes with the average error of 0.97% and the maximum error of 8.05%. When grouping the electrolytes as either structure making, structure breaking, or structure superbreaking, the correlations yield the average error of 0.59% and the maximum error of 3.45%. The correlations should be very useful in estimating the density of aqueous single and multicomponent electrolyte solutions including high-salinity produced water from oil and gas production.

On the analogy between the restricted primitive model and capacitor circuits. Part II: A generalized Gibbs-Duhem consistent extension of the Pitzer-Debye-Hückel term with corrections for low and variable relative permittivity

“…Further details for this calculation can be found in Müller et al 12 To use the dielectric constant database, the raw experimental data must preprocessed in order to express it in terms of mole fraction. The general density model for aqueous electrolytes from Nguyen et al 77 was applied for the pertaining change to mole fraction when the data was given in the molar concentration scale. The vast majority of this dielectric decrement data is for salts in water.…”

Electrolyte Thermodynamic Models in Aspen Process Simulators and Their Applications

“…While active research continues for the development of advanced electrolyte thermodynamic models, research and development of transport properties models for electrolyte solutions have been virtually nonexistent, and the current models in Aspen Properties remain empirical, are applicable only to very dilute electrolyte concentrations, and are largely polynomial in nature for concentration dependence. A rare development, a recent percent-level accuracy universal correlation made it possible to estimate the density of aqueous single and multicomponent electrolyte solutions at room temperature by grouping electrolytes as either structure making, structure breaking, or structure superbreaking . The transport properties of interest include density, viscosity, surface tension, diffusivity, and thermal conductivity.…”

“…A rare development, a recent percent-level accuracy universal correlation made it possible to estimate the density of aqueous single and multicomponent electrolyte solutions at room temperature by grouping electrolytes as either structure making, structure breaking, or structure superbreaking. 79 The transport properties of interest include density, viscosity, surface tension, diffusivity, and thermal conductivity. These transport properties are required for rate-based process simulation calculations such as hydraulics correlations for effective packing surface area, heat transfer coefficients, and mass transfer coefficients.…”