Absorption

Question 1

For absorbing a sparingly
soluble gas in a liquid, the ____ should be ____

Answer 1

liquid side
coefficient
should be
increased

Question 2

For contacting a highly
soluble gas with a liquid

Answer 2

bubble the gas through liquid

Question 3

Wetted wall tower experiment
determines

Answer 3

Mass transfer coefficient

Question 4

Channeling is most severe

Answer 4

in towers packed with stacked packing

Question 5

Stacked packing compared to
dumped packing

Answer 5

gives lower pressure drop

Question 6

Flooding results in

Answer 6

Low tray efficiency

Question 7

Operating velocity in a
packed tower is usually

Answer 7

Half the flooding velocity

Question 8

At the same gas flow rate, the
pressure drop in a packed
tower being irrigated with
liquid

Answer 8

Is greater
than that in dry
packed

Question 9

Berl saddle made of carbon
cannot be used

Answer 9

in oxidizing
atmosphere

Question 10

Flooding in a column results

Answer 10

high pressure drop

Question 11

The operating line for an
absorbed is curved when
plotted in terms of

Answer 11

partial pressure

Question 12

In case of an absorber, the
operating line

Answer 12

always lies above the equilibrium curve

Question 13

For an absorber, both
equilibrium and operating line
will be straight for

Answer 13

dilute solution and isothermal operation

Question 14

In case of an absorber, the
operating

Answer 14

a.) line always lies above the equilibrium curve

Question 15

Absorption factor is defined
as

Answer 15

slope of the operating line/slope of the equilibrium curve

Question 16

H2S present in naphtha
reformed gas is removed by
absorbing with

Answer 16

Ethanolamine

Question 17

If G = insoluble gas in gas
stream and L = non-volatile
solvent in liquid stream, then
the slope of the operating line
for the absorber is

Answer 17

L/G

Question 18

The minimum liquid rate to
be used in an absorber
corresponds to an operating
line

Answer 18

Tangential to
the equilibrium
curve

Question 19

Type of tray that is most widely used because of low cost

Answer 19

Sieve or perforated trays

Question 20

Solute reacts with solvent

Answer 20

Chemical Absorption

Question 21

Vertical, cylindrical pressure vessel containing one or more packing material

Answer 21

Packed column

Question 22

Fitted to enhance the removal if absorbent droplets

Answer 22

Demister pad

Question 23

Most important of all the column internal devices

Answer 23

Liquid distributor

Question 24

Designed to flow on top of the packed bed

Answer 24

Hold down grid

Question 25

Type of material that if thin walled, better contact between streams but strength is compromised

Answer 25

Raschig rings

Question 26

Type of packing materials in random packing that has superior wettability but inferior strength

Answer 26

Ceramics

Question 27

Expansion of liquid stream due to high gas velocity

Answer 27

Foaming

Question 28

Unresolved entrainment problems

Answer 28

Flooding

Question 29

Two phase regime where the gas phase is continuous and it occurs for low weir heights

Answer 29

Spray regime

Question 30

Used for low efficiency, and highly soluble gaseous contaminants (industrial equipment)

Answer 30

Spray tower

Question 31

Function is to maintain the desired liquid level on each tray

Answer 31

Weir

Question 32

Entering gas called

Answer 32

Rich gas

Question 33

Liquid which takes up one or more components from a gaseous mixture

Answer 33

Absorbent

Question 34

HTU means

Answer 34

Height of transfer units

Question 35

Most important component of packed column

Answer 35

Packed bed

Question 36

A unit operation where a soluble vapor is absorbed from its mixture with an inert gas by means of a liquid in which the solute is more soluble

Answer 36

Gas Absorption

Question 37

Process of removing gas dissolved in a liquid where the liberated gas is taken up in a gas or vapor in contact with the liquid

Answer 37

Desorption

Question 38

Tower where liquid flows down over a packing material in a countercurrent or co-current flow with gaseous mixture while one or more of the gaseous components are absorbed in the liquid

Answer 38

Absorption tower

Question 39

Condition in which the packing surface is not wetted due to low liquid rates

Answer 39

Channeling

Question 40

Plate column where a gas is absorbed while a gas mixture bubbles through the liquid which passes down from plate to plate

Answer 40

Absorption Column

Question 41

Excessive build up of liquid on the plates caused by insufficient drainage through the downcomers

Answer 41

Downflow flooding

Question 42

Upper limit to the rate of gas flow

Answer 42

Flooding Velocity

Question 43

In loading point, pressure drop start to ___ with ___ gas or vapor velocity caused by rapid increase in liquid hold up.

Answer 43

Increase, increasing

Question 44

Cylindrical shell filled with small objects to bring about intimate contact between rising fluid and descending liquid

Answer 44

Packed Column Tower

Question 45

Outer diameter of proprietary rings

Answer 45

Packing diameter

Question 46

Process in which the liquid is employed to achieve or assist in the removal of dispersed particles from the gas

Answer 46

Scrubbing

Question 47

In stacked packing, rings were placed ____ each other with vertical axis

Answer 47

Beside

Question 48

In stacked packing, wooden grids were used in ___

Answer 48

Cross-packed layers

Question 49

Liquid leaks through the perforations ot valves because of insufficient counter-current gas flow

Answer 49

Weeping

Question 50

Excessive weeping

Answer 50

Dumping

Question 51

___ weirs frequently used in low pressure or vacuum columns

Answer 51

Low

Question 52

___ weirs are used for low liquid loads

Answer 52

Notched (rectangular or v-shaped)

Question 53

Intersection of OL and EL for which infinite stages is required

Answer 53

Pinch point

Question 54

In absorption factor, A= L'/mV', when A is large, the solute tends to be ____

Answer 54

absorbed in the liquid phase

Question 55

simplified Kremser-Brown absorption equation

Answer 55

Tiller-Tour equation

Question 56

Method to be used in graphing if one of the lines (OL and EL) is not straight

Answer 56

McCabe-Thiele Method

Question 57

If the solution is dilute, OL is

Answer 57

Straight