Chapter 8, Problem 8.58P

A gas stream containing n-hexane in nitrogen with a relative saturation of 909? is fed to a condenser at 75°C and 3.0 atm absolute. The product gas emerges at 0°C and 3.0amt at a rate of 746.7 m³/h.

1. Calculate the percentage condensation of hexane (moles condensed/mole fed) and the rate (k W) at which heat must be transferred from the condenser.

Suppose the teed stream flow rate and composition and the heat transfer from the condenser arc the same as in Part (a), but the condenser and outlet stream pressure is only 2.5 atm instead of 3.0 atm. How would the outlet stream temperatures and flow rates and the percentage condensations of hexane calculated in Parts (a) and (b) change (increase, decrease, no change, no way to tell)? Don’t do any calculations, but explain your reasoning.