> Is there a way of using PhreeqcI to model the interaction of a relatively low solids brine containing both CO2 and H2S, plus some glycol? I am interested in modeling the behavior of such a brine vs. temperature and pressure, to determine the extent of degradation of the glycol. I'm not sure what you need. PHREEQC is not good with high ionic strength waters, say 1 molal and greater. On the other hand, I'm not sure what part of the thermodynamics you need. If it is just solubility of gases, it might be adequate; it has a linear log activity coefficient expression for uncharged species. Charged species will get more unreliable the higher the ionic strength. PHREEQC has no explicit pressure dependence in the aqueous model, but it is possible to specify partial pressures of ideal gases. I'd be reluctant to push things past a few atmospheres total pressure. You would have to define a new "Element" glycol and any dissociation/complexation that are pertinent. If you are trying to do all this a priori, I suspect you can't do it. If you are trying to model some experiments, you may be able to use some of the features of PHREEQC. David David Parkhurst (dlpark@xxxxxxxx) U.S. Geological Survey Box 25046, MS 413 Denver Federal Center Denver, CO 80225 Project web page: https://wwwbrr.cr.usgs.gov/projects/GWC_coupled
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