Distillation

Question 1

obtained when the reflux ratio approaches infinity

Answer 1

min number of stages

Question 2

when all liq from the condenser is returned to the column as reflux

Answer 2

reflux ratio - infinity

Question 3

estimate the min number of stages if the relative volatility of the binary system is known

Answer 3

Fenske Equation

Question 4

dictates the least number of stage when intercept is zero due to reflux ratio approaching infinity

Answer 4

diagonal (dictates the operating line)

Question 5

dictates the min number of stages when operating line (intercept is zero) due to reflux ratio approaching infinity

Answer 5

equilibrium curve

Question 6

when rectifying line approaches the intersection of feed line at the equilibrium curve

Answer 6

pinch point (condition of minimum reflux ratio)

Question 7

at this point the concentration of the liquid and vapor become constant and independent to the number of stages

Answer 7

pinch point

Question 8

in the equilibrium curve, where the min reflux ratio can be calculated

Answer 8

slope or intercept of this operating line

Question 9

this uses an open steam introduced at the bottom as the source of vapor instead of reboiler

Answer 9

open steam rectification

Question 10

to analyze the packed column distillation, what process can be used?

Answer 10

rate process using the mass transfer equation

Question 11

in mass transfer equation of packed column distillation what property of components are present?

Answer 11

equimolal counterdiffusion

Question 12

in packed column distillation, the number of transfer units can be evaluated using

Answer 12

graphical integration

Question 13

the following values can be calculated using:
- y*
- y

Answer 13

y* from the equilibrium curve
y from operating line for a particular value of x

Question 14

the height of a packed column and theoretical number of plates is related to

Answer 14

Height Equivalent to a Theoretical Plate (HETP)