DISTILLATION

Question 1

Tendency of a substance to lead a phase

Answer 1

Chemical potential

Question 2

Temp at which a liquid mixture of a given composition begins to vaporize as the temp is increased

Answer 2

bubble point

Question 3

Increase in dew point will result to

Answer 3

decrease in temp, increase in pressure

Question 4

a mixture with an equilibrium vapor of the same composition as the liquid

Answer 4

azeotrope

Question 5

This process involves heating a liquid mixture and then allowing it to expand into a vessel maintained at low pressure

Answer 5

Flash distillation

Question 6

Method of distillation used for the recovery of carotenes, omege 6 and 9

Answer 6

Steam distillation

Question 7

When relative volatility is 1 to 1.2, distillation is _____

Answer 7

not economical

Question 8

Distillation of EtOH -H2O system by adding benzene

Answer 8

Keyes Process

Question 9

Upon adding an external compound, if the resulting ternary system behaves as two system, it is called____\

Answer 9

extractive distillation

Question 10

If the resulting ternanru system behaves as three phase

Answer 10

azeotropic distillation

Question 11

distillation is carried out at a relatively uniform pressure with temp varying from stage to stage

Answer 11

isothermal distillation

Question 12

This method involves the use of enthalpy composition diagram

Answer 12

Ponchon Savarit method

Question 13

This method assumes that there is constant molar flowrate of liquid and vapor phases

Answer 13

McCabe Thiele Method

Question 14

Assumptions in McCabe thiele method

Answer 14

Molar heats of vaportization are roughly the same
Heat effects are negligible
-For every mole of vapor condensed, one mole of liquid is vaporized

Question 15

Relative volatility of the mixture at the azeotropic point where the solution exhibits minimum boiling is

Answer 15

Equal to 1

Question 16

When the molal heat of vaporization of the binary system is very much dependent of concn, the most appropriate to use to determine the no. of ideal stage is

Answer 16

Ponchon Savarit method

Question 17

McCabe Thiele method follows what rule

Answer 17

Trouton’s rule

Question 18

Another term for stripping

Answer 18

Desorption

Question 19

Degrees of freedom associated with distillation of a mixture with C components accdn to Gibbs phase rule

Answer 19

C

Question 20

Difference between the number of intensive variables needed to characterize systems at equilibrium and the number of equation that relate these variables

Answer 20

Degrees of freedom

Question 21

Relating observable properties with chemical potential

Answer 21

fugacity