Question

2. A hydrocarbon oil containing 4 mol% propane is being stripped by direct superheated steam in a stripping tray tower to reduce the propane content to 0.2%. The temperature is held constant at 422 K and pressure at 2 atm pressure. Pure steam at a flowrate of 11.42 kmol/h is used for 300 kmol/h of liquid flowrate. The vapor-liquid equilibrium is presented by y=25x, with usual meaning of y and x. Steam can be considered as inert gas and does not condense. (a) What is the minimum flowrate of the steam? (b) Using 1.25 times of the minimum gas flowrate, determine the number of trays required.

Answer 1

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