Solution to Training 4
F = 1000 kg-mole/hr, xF = 0. 20 (ethanol is MVC)
Feed can be saturated liquefied, thus queen = 1 . 0
xD = 0. 80, xB = zero. 02 (maximum); R = 5/3
Initially, plot the equilibrium curve using the VLE data provided. Note that you should convert mole% ethanol in mole small fraction. Then, apply the McCabe-Thiele method to discover the number of theoretical (equilibrium) racks required for the separation. �
Step 1 :
Since L and xD are regarded (5/3, and 0. 85 respectively), storyline the ROL equation - it moves through xD on the 45o diagonal, i actually. e. the point (0. eighty, 0. 80). The intercept is zero. 80 as well as (5/3+1) = 0. 30.
Plot the feed range using the q-line equation with q = 1 . zero and xF = zero. 20 - it passes through xF on the 45o diagonal.
In this instance, with q = 1 . 0, the q-line is actually a vertical series at xF = zero. 20. Then simply locate the intersection with ROL. Step 3:
Plot the TERRAIN, by signing up for the point xB = 0. 02 on the 45o diagonal to the intersection point between the ROL and q-line. Step 4:
Draw triangles starting from xD (between ROL and equilibrium curve) down to xB (between ENCANTO and equilibrium curve). The change from FUNCION to SOL occurs once xF is usually reached. [ Back on Top ]
From your graph plotted, number of triangles = 12-15. Thus, range of equilibrium periods required = 14 + 1 reboiler. Optimum give food to plate area = level #13. The distillate and bottoms flowrates (D and B) can be acquired using material balances: Total: F = D + B; thus, B = 1000 - D
MVC: F xF = D xD & B xB
Substituting for B gives: ( a thousand ) ( 0. twenty ) = ( D ) ( 0. 85 ) + ( multitude of - Deb ) ( 0. 02 ) Solving gives: M = 230. 77 kg-mole/hr
And M = 769. 23 kg-mole/hr
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Evaluation of Design and style:
It is mentioned that the Correcting Section has more trays (12) than the Stripping Section (3, including the feed tray yet excluding the reboiler). This is because the comparable volatility of ethanol lessens sharply with increase in ethanol concentration.
The relative movements is very high initially,...