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[manchester]

Hi,

I am trying to simulate NaCl liquid solubility in hydrocarbon mixture in Hysys 7.2.
The purpose is to determine how much NaCl liquid content in a hydrocarbon mixture. I use NRTL electrolyte package and do simulation by mixing a HC mixture and NaCl solution. By this, I got a number of how much NaCl mass fraction in HC at particular P & T.

My question:
Can NRTL Electrolyte predict the NaCl solubility in HC mixture corrrectly?
Or may be I am wrong in chosing Thermodynamic package?

Need your advice
Thanks

[Technical Bard]

You will have a lot of trouble with this - because none of the thermodynamic methods available will estimate what you are trying to find.

Usually, salt (NaCl) is present, not in the oil itself, but in fine droplets of connate brine (water). Salt is not particularly soluble in non-polar solvents (like hydrocarbons) because it's solubility requires dissolution and that doesn't happen in oil.

I have seen photomicrographs of water-free oil that contains salt - the salt is clearly visible as solid crystals in the oil phase. This is not atypical if the oil has been "flash-treated" to remove all the water by boiling it away.