Assignment 2

Question 1

What is an ideal solution?

Answer 1

Homogeneous mixture of substances that has physical properties linearly related to the properties of the pure components.

Question 2

How to convert the mass flowrate to mole flowrate?

Answer 2

m/M=n

Question 3

Which of the following equations are the correct Antoine’s equation?

(1) T_i^sat=B_i/(A_i·ln⁡P )·C_i,
(2) T_i^sat=C_i/(A_i·ln⁡P )·B_i,
(3) T_i^sat=C_i/(P·ln⁡A_i )·B_i

Answer 3

(1) T_i^sat=B_i/(A_i·ln⁡P )·C_i

Question 4

For given P and x_i, how do you calculate bubble point temperature and y_i

Answer 4

By using Antoine’s equation and an iteration.

Question 5

Define the different stages of an distillation collumn

Answer 5

Feed stage, rectifying section and stripping section

Question 6

McCabe Thiele method?

Answer 6

Construct the following:

1) x,y-diagram
2) Feed line
3) Rectifiying line
4) Stripping line
5) determine equilibrium line and numbers of stages

Question 7

What is the D stream?

Answer 7

The overhead product

Question 8

What is the B stream?

Answer 8

The bottom product

Question 9

What is the ̅L stream?

Answer 9

The stream going to the reboiler

Question 10

What is the ̅V stream?

Answer 10

The vapor coming back from the reboiler

Question 11

What is the V stream?

Answer 11

The vapor leaving the column

Question 12

What is the L stream?

Answer 12

The liquid going back into the column from the condenser

Question 13

How do you construct the feed line?

Answer 13

Feed line equation (remember the thermal condition of the feed entering)

Question 14

What is the mass balance for the rectifying section?

Answer 14

V=L+D

Question 15

Why do toluene and benzene create a nearly ideal solution?

Answer 15

The are chemically equivalent

Question 16

Why do toluene and benzene create a nearly ideal solution?

Answer 16

The are chemically equivalent

Question 17

Formular used to calculate the heat duty of the reboiler?

Answer 17

'’Reboiler equation’’, the calculated steam flow rate and the total latent heat.

Question 18

Method used for the condenser heat duty calculations?

Answer 18

Same unit operations as the method used in reboiler operations with the exception of the use of waters flow rate, specific capacity of water and the change in temperature

Question 19

Which stage should be the feed stage?

Answer 19

The feed stage is determined where the stage goes from the rectifying line past the feed line and reaches the stripping line.