Question

Problema 8. A mixture of n-heptane and toluene is separated by extractive distillation with phenol. The distillation is then used to recover phenol for recirculation, as shown in scheme (a), where the small amount of n-heptane in the feed is not considered. For the conditions indicated in scheme (a), determine the number of theoretical stages required. To control the column temperature, consider scheme (b) in which a side reboiler is used, located between the feed plate and the last plate at the bottoms, to provide 50% of the vaporization used in scheme (a). The remaining vaporization is provided by the reboiler. Determine the number of theoretical stages, as well as the boiling temperature of the stream entering from the side reboiler. The equilibrium data is as follows: Mole fractions of toluene: X (a) b) Líquido saturado Tolueno: 250 kmol/h Fenol: 750 kmol/h Líquido saturado Tolueno: 250 kmol/h Fenol: 750 kmol/h $V = 1.15 \left( \frac{V}{B} \right)_{min}$ $x_D = 0.98$ $x_B = 0.02$ $x_D = 0.98$ $x_B = 0.02$

          Problema 8. A mixture of n-heptane and toluene is separated by
extractive distillation with phenol. The distillation is then used to
recover phenol for recirculation, as shown in scheme (a), where the
small amount of n-heptane in the feed is not considered. For the
conditions indicated in scheme (a), determine the number of
theoretical stages required.
To control the column temperature, consider scheme (b) in which a
side reboiler is used, located between the feed plate and the last plate
at the bottoms, to provide 50% of the vaporization used in scheme (a).
The remaining vaporization is provided by the reboiler. Determine the
number of theoretical stages, as well as the boiling temperature of the
stream entering from the side reboiler. The equilibrium data is as
follows:
Mole fractions of toluene:
X
(a)
b)
Líquido saturado
Tolueno: 250 kmol/h
Fenol: 750 kmol/h
Líquido saturado
Tolueno: 250 kmol/h
Fenol: 750 kmol/h
$V = 1.15 \left( \frac{V}{B} \right)_{min}$
$x_D = 0.98$
$x_B = 0.02$
$x_D = 0.98$
$x_B = 0.02$

$Problema 8. A mixture of n-heptane and toluene is separated by extractive distillation with phenol. The distillation is then used to recover phenol for recirculation, as shown in scheme (a), where the small amount of n-heptane in the feed is not considered. For the conditions indicated in scheme (a), determine the number of theoretical stages required. To control the column temperature, consider scheme (b) in which a side reboiler is used, located between the feed plate and the last plate at the bottoms, to provide 50% of the vaporization used in scheme (a). The remaining vaporization is provided by the reboiler. Determine the number of theoretical stages, as well as the boiling temperature of the stream entering from the side reboiler. The equilibrium data is as follows: Mole fractions of toluene: X (a) b) Líquido saturado Tolueno: 250 kmol/h Fenol: 750 kmol/h Líquido saturado Tolueno: 250 kmol/h Fenol: 750 kmol/h V = 1.15 ( (V)/(B))min xD = 0.98 xB = 0.02 xD = 0.98 xB = 0.02$

Added by Sherri H.

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