Work

Thermodynamic modeling of calcium sulfate hemihydrate formed from seawater and concentrated brine at elevated temperature

Year: 2024

Type: article

Abstract: Formation of hard scale, predominantly calcium sulfate, is the limiting factor in the operation of multi-stage flash (MSF) thermal desalination of seawater, restricting the top temperature and top brine concentration that can be achieved. We analyse literature data for calcium sulfate solubility and apply the Pitzer model to determine solubility product values at temperatures up to 148 °C and total dissolved solids concentration up to 99 g/L. From these we then determine a simple analytical expression for predicting the supersaturation index (SI) under these conditions, SI = 61.5891 – 0.4783 ln(TDS) + 0.3223 (ln(TDS))2 – 31.7890 ln(T) + 3.7977 (ln(T))2

Source: Case Studies in Chemical and Environmental Engineering

DOI: 10.1016/j.cscee.2024.101088

Authors: Ali Al-Hamzah, Caillan J. Fellows, Caillan J. Fellows, Christopher M. Fellows, Christopher M. Fellows

Institutions: Saudi Water Authority, University of New England

Language: English

Topic: Crystallization and Solubility Studies

Subfield: Materials Chemistry

Field: Materials Science

Domain: Physical Sciences

SDG: Clean water and sanitation

Open Access status: gold

Estimated APC paid: $760