Unit Operations - Distillation

(A) yields discreet concentration changes while (B) yields infinitesimal concentration changes

The difference between stage operation (A) and a continuous phase contact operation (B) is that

Stripping

Desorption is another term for

lower

In a simple batch distillation, the boiling point of the distillate product compared to the residue is

vertical

When the feed to the rectifying column is a saturated liquid, the feed line is

heat and mass transfer

The distillation process involves

higher in B

A binary solution, where A is a low boiler, exhibiting a maximum boiling point, is subjected to flash distillation. If the feed has a concentration in A less than the azeotropic point, the concentration of the distillate will be

Distillation

The unit operation by which miscible liquids are separated from one another through heat and mass transfer is

extractive distillation

When the relative volatility of two miscible components is close to 1.00, the components can be separated by

3

The degrees of freedom associated with a ternary distillation process, according to the Gibbs' phase rule, is

reduce the number of trays in the column

Vacuum distillation is resorted to in order to

reduce the column pressure

To improve the degree of separation of the more volatile component from the less volatile component through distillation, the chemical engineer may, without changing the variables,

makes separation difficult

Increasing the operating pressure of a distillation column

the bottom of a distillation column

A reboiler provides heat to the

Ponchon-Savarit Method

When the molal latent heat of vaporization of the binary system is very much dependent on concentration, the most appropriate method to use to determine the number of ideal stages is

water

Open steam binary rectification may be applied with success if the less volatile component is

infinite

At minimum reflux ratio, the number of plates is

vacuum pump

In a vacuum distillation column the vacuum is usually created by a

equal to 1

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

relative volatility

The ease or difficulty of separating components by distillation is determined by the

mass transfer equipment

A debutanizer is a

reflux

In distillation, the cooled liquid stream returned to the column to cool a plate or stage is called

the system follow Trouton's Rule

McCabe-Thiele method to determine the theoretical number of stages may be applied with acceptable result if

an infinite number of plates

The theoretical minimum reflux ratio in a distillation column is attained if the column has

Distillation

The physical separation of components in a miscible mixture by simultaneous evaporation and condensation is

completely immiscible in water

In batch open steam distillation, the solution to be open steam distilled should be

the bottom

In a distilling column, the highest pressure will be at

Distillation

The unit operations by which the lighter components in a multicomponent solution of volatile liquids are separated from the heavier components is called

true

In distillation where there are two components and both components are found in both phases, only one variable such as liquid phase concentration can be changed independently if the pressure is fixed and the temperature and vapor phase concentration will follow. This statement is

condenser

A heat transfer equipment to convert vapor to liquid is an/a

concentration gradient

For a mass transfer to take place, there must be

Sub-cooled liquid

A 50% by weight benzene-toluene mixture is fed to a column at 180F and 1 atm. The condition of this feed is

slightly affected by temperature

Strictly speaking, the relative volatility of most ideal binary solution is

decreases

For a non-azeotropic solution being distilled, the temperature in the distillation column, from bottom to top

increase the number of degrees of freedom

The primary reason why close steam is used in an open batch steam distillation is to

the operating temperature is decreased

In a two-component flash distillation process, when the operating pressure is specified, the concentration of the distillate may be improved in the more volatile component if

all of these

The recent availability of digital computers resulted in the development of many analytical expressions for the evaluation of K-values. Which of the items below is a source of analytical method for K-values

none of these

The activity coefficient of a component in a non-ideal liquid solution at low pressure is approximated to be equal to

Tiller-Tour Equation

For nearly pure products in a stage operations, the theoretical number of plates may be estimated using the