University of Oulu

Vielma, T., Hnedkovsky, L., Uusi-Kyyny, P., Salminen, J., Alopaeus, V., Lassi, U., & Hefter, G. (2021). A Volumetric Pitzer Model for Aqueous Solutions of Zinc Sulfate up to Near-Saturation Concentrations at Temperatures from 293.15 to 393.15 K and Pressures up to 10 MPa. Journal of Chemical & Engineering Data, 66(1), 58–64. https://doi.org/10.1021/acs.jced.0c00768

A volumetric Pitzer model for aqueous solutions of zinc sulfate up to near-saturation concentrations at temperatures from 293.15 to 393.15 K and pressures up to 10 MPa

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Author: Vielma, Tuomas1; Hnedkovsky, Lubomir2; Uusi-Kyyny, Petri3;
Organizations: 1Research Unit of Sustainable Chemistry, University of Oulu, FI-90014 Oulu, Finland
2Chemistry Department, Murdoch University, Murdoch, WA 6150, Australia
3Department of Chemical and Metallurgical Engineering, School of Chemical Engineering, Aalto University, FI-00076 Aalto, Finland
4Boliden Kokkola Oy, FI-67900 Kokkola, Finland
Format: article
Version: accepted version
Access: embargoed
Persistent link: http://urn.fi/urn:nbn:fi-fe2020112693304
Language: English
Published: American Chemical Society, 2021
Publish Date: 2021-11-18
Description:

Abstract

Literature data for the volumetric properties of aqueous solutions of zinc sulfate have been compiled and compared with extensive recently available measurements. A semi-empirical Pitzer model has been derived from these data that reproduces the apparent molar volumes and compressibilities of zinc sulfate solutions with good accuracy to near-saturation concentrations (m ≲ 3.0 mol·kg⁻¹) over the temperature range 293.15 ≤ T/K ≤ 393.15 and at pressures up to 10 MPa, using standard volumes, V°, obtained by additivity of ionic values from the literature. By including the dependence of V° on the compressibility of pure water, the model was able to predict apparent molar volumes with good accuracy even up to 100 MPa at 298 K. Of potential use for engineering applications, imposition of the inequality (∂²Vϕ/∂T²)p,m < 0 to the Pitzer model has created the possibility of physically reasonable extrapolations to temperatures well beyond the parameterization range.

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Series: Journal of chemical & engineering data
ISSN: 0021-9568
ISSN-E: 1520-5134
ISSN-L: 0021-9568
Volume: 66
Issue: 1
Pages: 58 - 64
DOI: 10.1021/acs.jced.0c00768
OADOI: https://oadoi.org/10.1021/acs.jced.0c00768
Type of Publication: A1 Journal article – refereed
Field of Science: 116 Chemical sciences
Subjects:
Funding: Saostus (A301153, EU/European Regional Development Fund) and AdChem (Tekes, 1792/31/2016) projects, Walter Ahlström Foundation, and Murdoch University are acknowledged for the research funding.
Copyright information: This document is the Accepted Manuscript version of a Published Work that appeared in final form in J. Chem. Eng. Data, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acs.jced.0c00768.