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Separation Processes > Absorption > Flashcards

Absorption Flashcards

1
Q

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

A

liquid side
coefficient
should be
increased

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2
Q

For contacting a highly
soluble gas with a liquid

A

bubble the gas through liquid

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3
Q

Wetted wall tower experiment
determines

A

Mass transfer coefficient

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4
Q

Channeling is most severe

A

in towers packed with stacked packing

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5
Q

Stacked packing compared to
dumped packing

A

gives lower pressure drop

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6
Q

Flooding results in

A

Low tray efficiency

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7
Q

Operating velocity in a
packed tower is usually

A

Half the flooding velocity

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8
Q

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

A

Is greater
than that in dry
packed

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9
Q

Berl saddle made of carbon
cannot be used

A

in oxidizing
atmosphere

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10
Q

Flooding in a column results

A

high pressure drop

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11
Q

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

A

partial pressure

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12
Q

In case of an absorber, the
operating line

A

always lies above the equilibrium curve

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13
Q

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

A

dilute solution and isothermal operation

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14
Q

In case of an absorber, the
operating

A

a.) line always lies above the equilibrium curve

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15
Q

Absorption factor is defined
as

A

slope of the operating line/slope of the equilibrium curve

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16
Q

H2S present in naphtha
reformed gas is removed by
absorbing with

A

Ethanolamine

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17
Q

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

A

L/G

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18
Q

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

A

Tangential to
the equilibrium
curve

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19
Q

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

A

Sieve or perforated trays

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20
Q

Solute reacts with solvent

A

Chemical Absorption

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21
Q

Vertical, cylindrical pressure vessel containing one or more packing material

A

Packed column

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22
Q

Fitted to enhance the removal if absorbent droplets

A

Demister pad

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23
Q

Most important of all the column internal devices

A

Liquid distributor

24
Q

Designed to flow on top of the packed bed

A

Hold down grid

25
Q

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

A

Raschig rings

26
Q

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

A

Ceramics

27
Q

Expansion of liquid stream due to high gas velocity

A

Foaming

28
Q

Unresolved entrainment problems

A

Flooding

29
Q

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

A

Spray regime

30
Q

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

A

Spray tower

31
Q

Function is to maintain the desired liquid level on each tray

A

Weir

32
Q

Entering gas called

A

Rich gas

33
Q

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

A

Absorbent

34
Q

HTU means

A

Height of transfer units

35
Q

Most important component of packed column

A

Packed bed

36
Q

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

A

Gas Absorption

37
Q

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

A

Desorption

38
Q

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

A

Absorption tower

39
Q

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

A

Channeling

40
Q

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

A

Absorption Column

41
Q

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

A

Downflow flooding

42
Q

Upper limit to the rate of gas flow

A

Flooding Velocity

43
Q

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

A

Increase, increasing

44
Q

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

A

Packed Column Tower

45
Q

Outer diameter of proprietary rings

A

Packing diameter

46
Q

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

A

Scrubbing

47
Q

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

A

Beside

48
Q

In stacked packing, wooden grids were used in ___

A

Cross-packed layers

49
Q

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

A

Weeping

50
Q

Excessive weeping

A

Dumping

51
Q

___ weirs frequently used in low pressure or vacuum columns

A

Low

52
Q

___ weirs are used for low liquid loads

A

Notched (rectangular or v-shaped)

53
Q

Intersection of OL and EL for which infinite stages is required

A

Pinch point

54
Q

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

A

absorbed in the liquid phase

55
Q

simplified Kremser-Brown absorption equation

A

Tiller-Tour equation

56
Q

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

A

McCabe-Thiele Method

57
Q

If the solution is dilute, OL is

A

Straight

Separation Processes (3 decks)

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