Flash Distillation of a Mixture of Four Hydrocarbons

flash pressure

180

heat load

0

Consider a liquid feed composed of

n

-butane,

n

-pentane,

n

-heptane, and

n

-octane at 50 °C and 1000 kPa. The feed has a flow rate of 10 kmol/hr and contains

25

mole% for each of the four hydrocarbons.

The Demonstration calculates the composition of the liquid and vapor leaving the flash vessel for user-selected values of the flash pressure,

P

, and the added heat rate,

Q

, expressed in kJ/hr. The adiabatic flash distillation case is recovered if one sets

Q=0

. Values of the flash pressure (in kPa) and temperature (in Kelvin) are also displayed.