Modeling of Vapor-Liquid-Solid Equilibria in Acidic Aqueous Solutions

Søren Gregers Christensen, Kaj Thomsen

Research output: Contribution to journalJournal articleResearchpeer-review


The phase behavior (vapor - liquid equilibria (VLE) and solid - liquid equilibria (SLE)) and thermal properties of aqueous solutions of ions like (K+, Na+, NH4+, Ca2+, Cl-) in the presence of phosphoric acid (H3PO4, H2PO4-, HPO42- ) and nitric acid (HNO3, NO3-) are described by means of the Extended UNIQUAC model. Model parameters are evaluated on the basis of more than 2000 experimental data points. There is good agreement between calculated and experimental data points. The model parameters are valid in the temperature range from -18 - +122°C and in the concentration range up to 12 molal for the acids HNO3 and H3PO4.
Original languageEnglish
JournalIndustrial & Engineering Chemistry Research
Issue number18
Pages (from-to)4260-4268
Publication statusPublished - 2003

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