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# Flash calculations problem PowerPoint PPT Presentation

Flash calculations problem . 100mole of liquid mixture containing 50% n- heptane and 50% n-octane at 30 o C is continuously flash vaporized at 1atm. Find the quantity and composition of of liquid and vapor streams. Flashing temperature is 113 o C. Antoine constants:. Steps:

Flash calculations problem

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### Flash calculations problem

100mole of liquid mixture containing 50% n-heptane and 50% n-octane at 30oC is continuously flash vaporized at 1atm. Find the quantity and composition of of liquid and vapor streams. Flashing temperature is 113oC.

Antoine constants:

Steps:

1- Assume (L/V)1 =1.

2- Calculate Sx1=0.992 and Sy1=1.008 .

3- Sx ≠1 and Sy≠1assume another L/V

4- Assume (L/V)2 =0.5

5- Calculate Sx2= 1.005 and Sy2= 0.9975 .

6- Interpolate for any of them say Sx.

L/V=0.69

V=59.5mole L=40.5mole

The vapor and liquid compositions: