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Calculating Vapor Composition from known liquid composition

Calculating Vapor Composition from known liquid composition

Calculating Vapor Composition from known liquid composition

(OP)
Need some help extracting this from my brain. I need to calculate the vapor composition of 60%isopropanol/water mixture at atmospheric pressure and 160 F (for scrubber emissions estimate). Tried running a flash in aspen but nothing flashes. I feel like this should be easy to calculate by hand but can't find a great example in my thermo book.

RE: Calculating Vapor Composition from known liquid composition

Check your old mass transfer text from college, not thermo.

Good luck,
Latexman

Technically, the glass is always full - 1/2 air and 1/2 water.

RE: Calculating Vapor Composition from known liquid composition

(OP)
After reading up again I think you just use Antoine's to get the vapor pressure of both, then use Rault's to get the partial pressure and thus, the mole fraction.

RE: Calculating Vapor Composition from known liquid composition

chebags05
You are on the right track. Then once you have the mole fraction multiply that by the air flow to get your emissions.

Regards
StoneCold

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