Question 1

The upper section of the tower is referred to as:

Accepted Answer

A)   feed section
B)   rectifying section
C)   enriching section
D)   stripping section
E)   b & cF) A) and D)
G) A) and B)

Question 2

-Refer to Bottom VLE graphic above. On a VLE chart the top curve is referred to as:_________________ .

Accepted Answer

Primary: high flow rate from f...

Question 3

The tray located below the inlet feed line is called the:

Accepted Answer

A)   mid section tray
B)   pumping section tray
C)   feed tray
D)   valve trayE) B) and C)
F) A) and D)

Question 4

Using information from question 6, calculate the % component in vapor of hexane:

Accepted Answer

A)   20%
B)   25%
C)   30%
D)   35%E) A) and B)
F) All of the above

Question 5

Two basic tower designs include:

Accepted Answer

A)   packed and tray
B)   plate and packed
C)   bubblecap and sieve
D)   valve and packed
E)   a & bF) A) and D)
G) A) and E) B

Question 6

When a heat exchanger is used to convert all of the overhead vapors to liquid, it is called:

Accepted Answer

A)   normal overhead condenser
B)   total reflux
C)   total condenser
D)   partial condenserE) C) and D)
F) All of the above C

Question 7

List and describe the three technology periods of distillation.

Accepted Answer

batch, con...

Question 8

Boil-up rate is defined as:

Accepted Answer

A)   the temperature at which a liquid turns to vapor
B)   the vapor-liquid balance returned to tower from the reboiler
C)   the vapor-liquid reflux balance returned to tower from overhead accumulator.
D)   the total amount of vapor moving up the column.E) C) and D)
F) None of the above

Question 9

What is the composition of side stream #2z?

Accepted Answer

C-8 = 10%,...

Question 10

The larger the difference between partial pressures the harder it is to separate the fractions by boiling point.

Accepted Answer

A) True 
 B)False

Question 11

The Vapor Liquid Equilibrium diagram is primarily used for :

Accepted Answer

A)   a condition or state where the rate of evaporation (liquid changing to vapor)  equals the rate of condensation (vapor changing to a liquid) .
B)   A & C
C)   visualizing a condition where a liquid and it's vapor (gas phase)  are in equilibrium with each other.
D)   components in a binary mixture exert partial pressures that are equal.E) A) and D)
F) C) and D)

Question 12

The lower section of the tower is referred to as:

Accepted Answer

A)   feed section
B)   rectifying section
C)   enriching section
D)   stripping section
E)   b & cF) A) and E)
G) B) and D)

Question 13

Incomplete separation of components in a mixture:

Accepted Answer

A)   overlap
B)   puking
C)   temperature gradient
D)   overloadingE) B) and C)
F) A) and D)

Question 14

The Reflux Ratio is best defined as :

Accepted Answer

A)   the amount of overhead product returned to the column as reflux in relation to the amount of overhead taken off to storage.
B)   careful control of column top temperature and product purity.
C)   reflux rate divided by product rate
D)   A & CE) All of the above
F) A) and D)

Question 15

High bottoms temperature in a distillation tower are controlled by :

Accepted Answer

A)   increase over head flow and decrease bottoms flow
B)   decrease overhead flow and increase bottoms flow
C)   stop feed flow and cut bottom temperature
D)   open side-streamsE) None of the above
F) A) and B)

Question 16

A ternary mixture:

Accepted Answer

A)   lighter hydrocarbons
B)   is heavier than a ternary mixture
C)   two or more components
D)   three compounds in a mixtureE) All of the above
F) A) and D) D

Question 17

Distillation columns have two major types of separation grids: plate and packing. Plate towers have the following tray types:

Accepted Answer

bubble-cap...

Question 18

The temperature at which a liquid boils and forms vapors is referred to as the:

Accepted Answer

A)   boiling point
B)   specific temperature
C)   bubble point
D)   dew pointE) All of the above
F) B) and C)

Question 19

Each tray in a distillation column has a different molecular structure.

Accepted Answer

A) True 
 B)False

Question 20

A binary mixture contains:

Accepted Answer

A)   lighter hydrocarbons
B)   is heavier than a ternary mixture
C)   two or more components
D)   three compounds in a mixtureE) A) and B)
F) C) and D)

Exam 15: Distillation Systems

The upper section of the tower is referred to as:

Correct AnswerverifiedShow Answer

-Refer to Bottom VLE graphic above. On a VLE chart the top curve is referred to as:_________________ .

Correct AnswerverifiedPrimary: high flow rate from f...View AnswerShow Answer

The tray located below the inlet feed line is called the:

Correct AnswerverifiedShow Answer

Using information from question 6, calculate the % component in vapor of hexane:

Correct AnswerverifiedShow Answer

Two basic tower designs include:

Correct AnswerverifiedB

When a heat exchanger is used to convert all of the overhead vapors to liquid, it is called:

Correct AnswerverifiedC

List and describe the three technology periods of distillation.

Correct Answerverifiedbatch, con...View AnswerShow Answer

Boil-up rate is defined as:

Correct AnswerverifiedShow Answer

What is the composition of side stream #2z?

Correct AnswerverifiedC-8 = 10%,...View AnswerShow Answer

The larger the difference between partial pressures the harder it is to separate the fractions by boiling point.

Correct AnswerverifiedShow Answer

The Vapor Liquid Equilibrium diagram is primarily used for :

Correct AnswerverifiedShow Answer

The lower section of the tower is referred to as:

Correct AnswerverifiedShow Answer

Incomplete separation of components in a mixture:

Correct AnswerverifiedShow Answer

The Reflux Ratio is best defined as :

Correct AnswerverifiedShow Answer

High bottoms temperature in a distillation tower are controlled by :

Correct AnswerverifiedShow Answer

A ternary mixture:

Correct AnswerverifiedD

Distillation columns have two major types of separation grids: plate and packing. Plate towers have the following tray types:

Correct Answerverifiedbubble-cap...View AnswerShow Answer

The temperature at which a liquid boils and forms vapors is referred to as the:

Correct AnswerverifiedShow Answer

Each tray in a distillation column has a different molecular structure.

Correct AnswerverifiedShow Answer

A binary mixture contains:

Correct AnswerverifiedShow Answer

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Primary: high flow rate from f...
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B

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C

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batch, con...
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C-8 = 10%,...
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D

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bubble-cap...
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