Question

(Class Example) Consider a saturated liquid feed stream at 10 bar pressure, 10 kg/h. The stream consists of:Propane - 42 mol %, i-Butane - 10 mol%, n-butane - 45 mol %, n-pentane - 3 mol %. It is desired to flash this stream to a pressure of 5 bar and to separate 95% of the n-pentane via the product liquid stream. Determine the heat duty (MJ/h) in the flash unit needed to accomplish this operation.

Fig: 1