Toluene/Water Solution
Toluene/Water Solution
(OP)
Hi all,
I'm looking at concentration a water wet toluene solution by distillation. I have about 1500L of toluene which I need to get down to about 100L. I understand the solubility of water in toluene to only be about 0.03% w/w (my toluene will be saturated with water) but I'm looking to do a constant volume distillation so would like a Txy curve to work with? Any idea how I might get this for my system?
I'm looking at concentration a water wet toluene solution by distillation. I have about 1500L of toluene which I need to get down to about 100L. I understand the solubility of water in toluene to only be about 0.03% w/w (my toluene will be saturated with water) but I'm looking to do a constant volume distillation so would like a Txy curve to work with? Any idea how I might get this for my system?





RE: Toluene/Water Solution
RE: Toluene/Water Solution
RE: Toluene/Water Solution
RE: Toluene/Water Solution
RE: Toluene/Water Solution
RE: Toluene/Water Solution
RE: Toluene/Water Solution
Good luck,
Latexman
Technically, the glass is always full - 1/2 air and 1/2 water.
RE: Toluene/Water Solution
Having thought about it I guess it's obvious that any water that is present will come off at the toluene/water azeotrope temperature of ca. 86°C.. Once all the water is gone the dry toluene will start coming off at 111°C or whatever it's BP is??
How would I go about finding the water/toluene azeotrope boiling point at reduced pressures? Say 0.2bar?
RE: Toluene/Water Solution
It is better to have enough ideas for some of them to be wrong, than to be always right by having no ideas at all.
RE: Toluene/Water Solution
RE: Toluene/Water Solution
Good luck,
Latexman
Technically, the glass is always full - 1/2 air and 1/2 water.
RE: Toluene/Water Solution
RE: Toluene/Water Solution
Good luck,
Latexman
Technically, the glass is always full - 1/2 air and 1/2 water.
RE: Toluene/Water Solution
RE: Toluene/Water Solution
So you want to feed strip your solution to concentrate the large steroid molecule? That's not very complicated, if you are doing it at atmospheric pressure it probably boils around 110C. Fill the vessel about 80% full, heat it up. Continue to fill the vessel as toluene is boiled off. You may want to do it under vacuum as organic molecules tend to break at higher temperatures. The operation is the same, you just distill at a lower temperature. Is there more to the question that we have not covered?
Regards
StoneCold
RE: Toluene/Water Solution
RE: Toluene/Water Solution
Good luck,
Latexman
Technically, the glass is always full - 1/2 air and 1/2 water.
RE: Toluene/Water Solution
You know for a fact that you form the azeotrope in your system using a single stage flash to concentrate the steroid? Or are you using a multi-stage distillation setup and you are getting the azeotrope for a few minutes? Either way you still just distill the toluene/water overhead. No issues.
Regards
StoneCold
RE: Toluene/Water Solution
Sadly, this entire subsection has been expunged from the 7th edition.
RE: Toluene/Water Solution
The system can be considered a mixture of involatile solute and pure toluene. No simulator is required- you can do the required calculations knowing nothing more than the vapour pressure of toluene with respect to temperature.