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## Main Question or Discussion Point

Right so basically, I'm doing a multicomponent distillation with some exotic chemicals.

My feed comes in at 13kPa and 60*C, so it's under vaccum. This will be a two phase mixture.

What I need is the vapour-liquid-equilibrium coefficients, 'K- values' at feed conditions.

I'm basing this on an ideal system to start with then I'll do it as non-ideal (fugacity coefficients etc)

So for now, I'm planning on using the Antoine Equation

Now the K values can be calulated with Raoults law Ki = Pi(sat)/Pt

My question is, will the pressure value I get from the Antoine equation be the saturated vapour pressure of component i? (Pi(sat))

Sorry this probably sounds terrible, but it's been a while

My feed comes in at 13kPa and 60*C, so it's under vaccum. This will be a two phase mixture.

What I need is the vapour-liquid-equilibrium coefficients, 'K- values' at feed conditions.

I'm basing this on an ideal system to start with then I'll do it as non-ideal (fugacity coefficients etc)

So for now, I'm planning on using the Antoine Equation

**ln P = A - ( B /( T + C) )**(from coulson & richardson vol 6)Now the K values can be calulated with Raoults law Ki = Pi(sat)/Pt

My question is, will the pressure value I get from the Antoine equation be the saturated vapour pressure of component i? (Pi(sat))

Sorry this probably sounds terrible, but it's been a while