Property package for NH3, CO2 in water
Property package for NH3, CO2 in water
(OP)
Can any one suggest which property package is good for simulation (HYSYS/ProII/VMGSIM) of NH3 & CO2 dissolved in water. I need to do a simulation of a distillation column which separates NH3/CO2 from water. I think Peng Robinson or SRK are not good for this mixture.
thanks
Rajesh
thanks
Rajesh





RE: Property package for NH3, CO2 in water
assume that all the CO2 will react with NH3 to form carbamate (pre-cursor to urea). so every molecule of CO2 will associate with 2 molecules of NH3.
then assume the excess NH3 will behave like a typical NH4OH ammonia/water compound.
you can get pretty close to estimating vapor pressure of the ammonia/water by doing this.
RE: Property package for NH3, CO2 in water
RE: Property package for NH3, CO2 in water
Many Urea plant process designs use a steam stripper (either live steam or via reboiler) to take water that is ~10% ammonia and 5% urea and get it down to ~10 PPM NH3 and ~10 PPM urea.
This stream typically contains a fair amount of CO2 as well and the relatively high bottom temperatures (~75 psig on the system and so >325°F) causes decomposition of the Urea to CO2 & NH3.
for this type of system, no NaOH was needed.