Chapters 14-15

Question 1

____ components exit the top of the column in the vapor phase.

Answer 1

Light

Question 2

_____ components re-condense and flow out of the bottom of the column.

Answer 2

Heavy

Question 3

Condensed vapors are collected in the ____ ____ (sometimes called the reflux drum). This product is called:

Answer 3

overheads accumulator

distillate

Question 4

Device that holds liquid level on a tray

Answer 4

Weir

Question 5

Device that gravity feeds liquid to next lowest tray.

Answer 5

Downcomer

Question 6

(T/F) Feed tray location is based on the expected composition of the feed.

Answer 6

TRUE

Question 7

A distillation system consists of:
A. feed and preheat system
B. bottoms and overhead system
C. Tank farm
D. All of the above

Answer 7

D. All of the above

Question 8

If the finished product in in spec, it is routed to a \_\_\_\_ tank.
A. prime
B. good
C. holding
D. atmospheric

Answer 8

A. prime

Question 9

Product is often routed to off-spec tanks during \_\_\_\_\_.
A. startup
B. shutdown
C. turnaround
D. break time

Answer 9

A. startup

Question 10

Reflux flow maybe operated in ____ or ____ control.

Answer 10

flow - temperature

Question 11

Product flow is operated in ____ control.

Answer 11

level

Question 12

Heat source for kettle reboiler is on the ____ side.
A. tube
B. shell

Answer 12

A. tube

Question 13

Product in a kettle reboiler is on the ____ side.
A. tube
B. shell

Answer 13

B. shell

Question 14

\_\_\_\_\_\_ flow from reboiler drives the columnn.
A. Water
B. Vapor
C. Reflux
D. Excess

Answer 14

B. Vapor

Question 15

(T/F) The lighter components in a mixture are less volatile than the heavy components.

Answer 15

FALSE - they are more volatile

Question 16

Inlet flow of the shell of kettle reboiler is from the ____ of column.
A. bottom
B. top

Answer 16

A. bottom

Question 17

What lowers the boiling points of liquids in a distillation column.
A. pressure
B. temperature
C. flow rate
D. vacuum

Answer 17

D. vacuum

Question 18

(T/F) The level in the reboiler should be controlled slightly above the tubes for optimum performance.

Answer 18

TRUE

Question 19

If cooling tower is lost to the overhead condenser, will column pressure increase and product likely be off-spec?

Answer 19

Yes

Question 20

Two chemicals separated in the book for distillation.

Answer 20

Butane and Pentane

Question 21

A high level in the reboiler will ____ the volume of the vapor capacity, and result in poor pressure control.
A. increase
B. reduce

Answer 21

B. reduce

Question 22

A low level in the kettle reboiler will cause ____ bottoms temperature and reduce flow to the bottoms cooler.
A. hotter
B. colder

Answer 22

A. hotter

Question 23

A vessel in which a controlled chemical reaction takes place.

Answer 23

Reactor

Question 24

Added to a reactor to promote chemical reaction without becoming part of the final product.

Answer 24

Catalyst

Question 25

``` High temperature and pressure generally ____ molecular movement and ____ the reaction rate. A. increase - increase B. increase - decrease C. decrease - increase D. decrease - decrease ```

Answer 25

A. increase - increase

Question 26

Type of reaction that requires addition of heat to promote the reaction - absorbs heat.

Answer 26

Endothermic

Question 27

Type of reaction that generates heat. A cooling source must be provided to remove the heat of the reaction.

Answer 27

Exothermic

Question 28

Book example is a ______ reaction.

Answer 28

Exothermic

Question 29

Mixer; provides mixing of the reactants for even distribution.

Answer 29

Agitator

Question 30

Two types of reactors.

Answer 30

Batch and Continuous

Question 31

(T/F) Low flow rates in a continuous reactor increases reaction time (residence time)

Answer 31

TRUE

Question 32

(T/F) Higher levels in a reactor increase the reaction time (residence time).

Answer 32

TRUE

Question 33

(T/F) You should run the reactor level really low so that the reactants will have a long residence time.

Answer 33

FALSE. Low level means you are pumping out reactants as soon as they enter.

Question 34

How high should the level of a reactor be run? A. Just below the agitator blades B. High enough to cover all agitator blades C. At maximum capacity D. Below all agitator blades

Answer 34

B. High enough to cover all agitator blades

Question 35

``` Identity of an element is defined by the: A. atomic number B. mass number C. element number D. bond number ```

Answer 35

A. atomic number (number of protons in the nucleus)

Question 36

Elements on the far right column of the periodic table. A. Noble Gases B. Alkali Metals C. Transition Elements

Answer 36

A. Noble Gases

Question 37

``` Carbon shares electrons with ____ atoms. A. Helium B. Hydrogen C. Halogen D. Argon ```

Answer 37

B. Hydrogen

Question 38

``` Hydrogen shares an electron with _____. A. Carbon B. Cobalt C. Helium D. Argon ```

Answer 38

A. Carbon

Question 39

(T/F) Every atom seeks to fill its outer shell of electrons.

Answer 39

TRUE

Question 40

Bonding that involves shared pairs of electrons.

Answer 40

Covalent Bond

Question 41

Distillation columns are designed to separate mixtures based on their:

Answer 41

boiling points