Hi, no I didnt get the data from perry's for the mole fraction point of view, I just assumed a constant mass transfer, I knew the y,x in and y,x out show changed them equally amoungst 10 evenly spaced points.

I have below the graph using data from perry's for the partial pressure point of view, I got data from perry's at 55oC, and drew a graph from the data I got and used that graph to get the partial pressure I actually needed at the 10 points, assuming that the acid dilutes from 98% to 75% at a constant rate.

Again to get pa* or the equilibrium data, I multiplied pa by x. The graph will give a two steps like the one I drew for mole fractions.

I am hoping this graph is correct as the equilibrium line clearly shows the system obeying to Henry's law for dilute streams at the top of the column (bottom half of the equilibrium curve) a low gradient, and obeying Raoult's law at the bottom of the column (top of the graph) for concentrated stream a high gradient.

The data for partial pressure is definetly correct I am just unsure about about how to get pa*. The only thing that seems to give any knid of appropiate graph is by multiplying pa by x, but this seems wrong as I am mixing partial pressures with mole fractions, but I hope that because the system is at 1 bar the mole fraction of water will represent the pressure of water in the solvent.

Let me know what you think thanks loads.