7.30. Multiple feeds and open steam. Solvent A is to be separated from water by distillation to produce a distillate containing 95 mol% A at a 95% recovery. The feed is avail- able in two saturated-liquid streams, one containing 40 mol% A and the other 60 mol% A. Each stream contains 50 kmol/h of component A. The relative volatility is 3, and since the less volatile component is water, it is proposed to supply the necessary reboiler heat in the form of open steam. For the preliminary design, the operating reflux ratio, L/D, is 1.33 times the minimum, using a total condenser. The overall plate efficiency is estimated to be 70%. How many plates will be required, and what will be the bottoms composition? Determine analytically the points necessary to locate the operating lines. Each feed should enter the column at its optimal location. The McCabe-Thiele method can be extended to multiple feeds by adding one additional operating line for each feed as shown in Figure 7.33 for two feeds, where F, is the uppermost feed and F₂ is the feed below F₁. The section of stages between the top stage and the feed stage for F, has an operating line with a slope L/V as determined from the reflux ratio. The section of stages between the two feed stages has an operating line with a slope L'/V', where L' = L+L in F, and V' = V - V in F₁ In Figure 7.33, F, is a saturated vapor feed, while F2 is a saturated liquid feed. The McCabe-Thiele method can also be extended to the use of open steam instead of a reboiler by altering the operating line for the stripping section as shown in Figure 7.34. The lower end of the 1.0 Saturated vapor assumed y Saturated liquid assumed ZF2 |x=2F1 0 Хв x y=x 1.0 Figure 7.33 Construction for multiple feeds for Exercise 7.30. 1.0 XB | x=ZF y=x 1.0 Figure 7.34 Construction for open steam for Exercise 7.30.
7.30. Multiple feeds and open steam. Solvent A is to be separated from water by distillation to produce a distillate containing 95 mol% A at a 95% recovery. The feed is avail- able in two saturated-liquid streams, one containing 40 mol% A and the other 60 mol% A. Each stream contains 50 kmol/h of component A. The relative volatility is 3, and since the less volatile component is water, it is proposed to supply the necessary reboiler heat in the form of open steam. For the preliminary design, the operating reflux ratio, L/D, is 1.33 times the minimum, using a total condenser. The overall plate efficiency is estimated to be 70%. How many plates will be required, and what will be the bottoms composition? Determine analytically the points necessary to locate the operating lines. Each feed should enter the column at its optimal location. The McCabe-Thiele method can be extended to multiple feeds by adding one additional operating line for each feed as shown in Figure 7.33 for two feeds, where F, is the uppermost feed and F₂ is the feed below F₁. The section of stages between the top stage and the feed stage for F, has an operating line with a slope L/V as determined from the reflux ratio. The section of stages between the two feed stages has an operating line with a slope L'/V', where L' = L+L in F, and V' = V - V in F₁ In Figure 7.33, F, is a saturated vapor feed, while F2 is a saturated liquid feed. The McCabe-Thiele method can also be extended to the use of open steam instead of a reboiler by altering the operating line for the stripping section as shown in Figure 7.34. The lower end of the 1.0 Saturated vapor assumed y Saturated liquid assumed ZF2 |x=2F1 0 Хв x y=x 1.0 Figure 7.33 Construction for multiple feeds for Exercise 7.30. 1.0 XB | x=ZF y=x 1.0 Figure 7.34 Construction for open steam for Exercise 7.30.
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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Question
Transcribed Image Text:7.30. Multiple feeds and open steam.
Solvent A is to be separated from water by distillation to produce a
distillate containing 95 mol% A at a 95% recovery. The feed is avail-
able in two saturated-liquid streams, one containing 40 mol% A and
the other 60 mol% A. Each stream contains 50 kmol/h of component
A. The relative volatility is 3, and since the less volatile component
is water, it is proposed to supply the necessary reboiler heat in the
form of open steam. For the preliminary design, the operating reflux
ratio, L/D, is 1.33 times the minimum, using a total condenser. The
overall plate efficiency is estimated to be 70%. How many plates will
be required, and what will be the bottoms composition? Determine
analytically the points necessary to locate the operating lines. Each
feed should enter the column at its optimal location.
The McCabe-Thiele method can be extended to multiple feeds
by adding one additional operating line for each feed as shown in
Figure 7.33 for two feeds, where F, is the uppermost feed and F₂
is the feed below F₁. The section of stages between the top stage
and the feed stage for F, has an operating line with a slope L/V as
determined from the reflux ratio. The section of stages between the
two feed stages has an operating line with a slope L'/V', where L' =
L+L in F, and V' = V - V in F₁ In Figure 7.33, F, is a saturated
vapor feed, while F2 is a saturated liquid feed.
The McCabe-Thiele method can also be extended to the use of
open steam instead of a reboiler by altering the operating line for
the stripping section as shown in Figure 7.34. The lower end of the
1.0
Saturated vapor assumed
y
Saturated
liquid
assumed
ZF2
|x=2F1
0
Хв
x
y=x
1.0
Figure 7.33 Construction for multiple feeds for Exercise 7.30.
1.0
XB
| x=ZF
y=x
1.0
Figure 7.34 Construction for open steam for Exercise 7.30.
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