How do I design a vapor$-$liquid separator? The gas is a mixture of mol$\%4\%$ H$2,36\%$ CO$2$ and $60\%$ H$2$O and flowrate of $400$ kmol$/$day $(16\mathrm{.}67$ kmol$/$hr$)$ at $350$C and $1$atm.Do I have to put a heat exchanger before the separator to decrease the gas temperature to a temperature below water boiling temperature before sending it to the separator? How do I maintain $1$atm pressure inside the separator? And what equations do I use to dimension the separator $($diameter$,$ height, space between trays$/$demister$)?$ Can I assume that the H$2$O condenses completely $($no need to account for relative humidity$/$partial pressure of vapor$)?$