Question

A mixture of 35 mole% n-hexane (C6H14) and rest n-heptane (C7H16) is fed to a flash drum operating at 1500 mmHg pressure. The feed rate is 100 mol/s. The mixture is heated to 100C, and the vapor and liquid are removed continuously. Assuming ideal conditions, calculate vapor and liquid flow rates and compositions.

Answer 1

bpt of hexane = 69degree centigrade

bptof heptane   = 98   "

Suppose we take 100 moles/s mixture   Lat us take x mass at zero time Then at 69 degree centigrade , Hexane will start coming out , temp will be constant . Cool it .Let its mass be y at that time

Then   vapour flowrate   =   y /time taken

          liquid flow rate   = ( x-y) / time taken