This process will treat 2000 kg/h of inert food substrate that initially contains 800 kg oil and 5 kg benzene. The inlet flow per hour of fresh solvent is 20 kg oil. Upon exit, the leached food substrate should contain no more than 120 kg oil. The food substrate retains different amounts of solution depending on the mass fraction of oil in solution, and this information is tabulated below:
kg food substrate / kg oil / kg solution
2.00 / 1.98 / 0.1
1.94 / 0.2
1.89 / 0.3
1.82 / 0.4
1.75 / 0.5
1.68 / 0.6
1.61 / 0.7
The diagram below represents the first stage and all remaining stages, with information given in the question. Notation is the same as developed in the lectures.
a) Determine ALL remaining unknowns as listed in this diagram:
Solvent, S3 = 1310 kg benzene; 20 kg oil
Loaded solvent, So = ?
Vz = 0.7
y2 = 0.7
Stage 2 > N
L = 3
x = 0.3
Food substrate, Le = ?
800 kg oil; 5 kg benzene
Xa = ?
Extracted food substrate, Lb = ? 120 kg oil.
Draw the equilibrium line and operating line representing this leaching process. Label each line. (zA arx) pue (rR R) (; aaug urerado au uo squared Aay ary (nqe] ili. Explain why the operating line is not completely straight from (o S) through to (k- W). iv Determine the number of stages graphically, using a McCabe-Thiele method.
