Problems in simulating electrolyte solutions
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Recently, while using Aspen11.1 to simulate the flashing of sodium aluminate solutions, it was found that the density of the resulting sodium aluminate solutions was not correct (around 1.05 g/mL, whereas it should be around 1.3 g/mL according to literature), and the greater the concentration, the larger the deviation in the results； When simulating the sodium hydroxide solution separately, the results are generally consistent. What is the reason for this? Has anyone done simulations in this area? Are there no relevant physical property parameters for sodium aluminate solution in Aspen? If not or if they are inaccurate, how should the relevant data be reconfigured or imported? I hope experienced folks can give some advice! ! I’m overwhelmed with gratitude~
The density of a solution is related to its concentration and temperature. Are the conditions you use for simulation the same as those used in the literature data measurements? If they are different, it’s normal for such a difference to occur
The concentration and temperature are the same. The settings are as follows: “Temperature: 150℃, Pressure: 4 bar. Mass fractions: H2O: 0.6642, NaOH: 0.1839, NaAlO2: 0.1519; Na+: 0, OH-: 0, AlO2-: 0”. The base method used is ELECNRTL, with true components taken into account. I set the values based on Na2O at 20% by weight and Al2O3 at 9.45% by weight; the simulated density is 1.047 gm/cc, whereas the value stated in literature is 1.281 gm/cc
Original poster, have you found the reason for the issue with the sodium aluminate solution? Are you still using Aspen?