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CHEM ENG REVIEWER (wag kayong ano) > DAY 2 UNIT OPS 1 > Flashcards

DAY 2 UNIT OPS 1 Flashcards

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1
Q

Transformation of a bed of solid particles to a fluid like state through upward drag force

A

Fluidization

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2
Q

Before the start of fluidization, the bed of particles is termed as ______

A

fixed bed

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3
Q

Once the drag force balances the weight of the bed, ________ is achieved

A

Minimum fluidizing velocity

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4
Q

After reaching the terminal settling velocity, where it continues to flow upward even at constant fluid velocity, the bed will become a ______

A

moblized bed

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5
Q

The bed is ______ if the minimum fluidizing velocity is not met

A

Fixed

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6
Q

Between minimum fluidizing velocity and terminal settling velocity, the bed is _______

A

fluidized

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7
Q

Beyond terminal settling velocity, bed is ______

A

mobilized

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8
Q

Describes how spherical particles are

A

sphericity

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9
Q

amount of mass per unit bed volume

A

bulk density

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10
Q

It is the first term of the ergun equation and it accounts for the viscous losses during fluidization and is dominant during laminar flow

A

Carman-Kozeny equation

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11
Q

Accounts for kinetic energy losses and is dominant during turbulent flow

A

Burke-Plummer equation (2nd term in ergun equation)

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12
Q

Terminal settling velocity is counteracted by _______

A

superficial velocity

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13
Q

Separation of a heterogenous mixture or slurry after allowing it to pass through a filter medium

A

Flitration

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14
Q

The clear liquid that passed through the filter

A

Filtrate

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15
Q

Solids accumulated on the filter

A

Filter cake

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16
Q

Rate of filtrate collection can be described by what equation

A

Ruth Equation

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17
Q

Operation where the filter cake is allowed to accumulate on the medium causing the cake resistance, consequently increase the pressure drop

A

Constrant Rate Filtration (CRF)

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18
Q

Operation where solids will rapidly form the cake and constant rate filtration will not be experienced

A

CPF (Constant pressure filtration)

19
Q

This type of filter operates by applying a higher pressure at the upstream side than the atmospheric pressure of the downstream side

A

Pressure driven filter

20
Q

Operate by applying a lower pressure on the downstream side that the atmospheric pressure of the upstream side

A

Vacuum driven filter type

21
Q

Most common pressure filter

A

Plate and frame

22
Q

most common vacuum filter

A

rotary vacuum filter

23
Q

Composed of several filter leaves arranged inside a horizontal tank

A

Leaf Filter or Shell-and-Leaf Filter

24
Q

Type of filter that cancbe operated continuously

A

rotary vacuum filter

25
Q

Attached knife that is used to scraped off cake in a rotary vacuum filter

A

Doctor blade

26
Q

Rotary vacuum filters work under
A. CPF
B. CRF

A

CPF

27
Q

Commonly peratins to separation of solid particles of at most 10micrometer by allowing the feed to pass perpendicularly to a very thin membrane area

A

Membrane separation

28
Q

Term used to refer to components that were able to pass through the membrane

A

Permeate

29
Q

Refers to the components retained by the membrane

A

Retentate

30
Q

Solids deposited on the membrane surface

A

Membrane fouling

31
Q

rate of permeate extraction per unit area

A

Flux

32
Q

Done to control fouling and restore the high flux by reversing the flow of permeate

A

Backflushing

33
Q

Membrane separation that can isolate all proteins

A

Ultrafiltration

34
Q

Can selectively separate some minerals from the feed

A

nanofiltration

35
Q

Operated through the application of relatively high pressure to force the separation of water molecules accross the semi permeable membrane

A

Reverse osmosis

36
Q

Type of membrane modules with cluster of porous tubes usually contained in a stainless steel pipe

A

Tubular

37
Q

Designed as a series of annular membrane discs sandwiched together by spacer plates

A

Flat sheet

38
Q

These are flat membranes enclosed in a central collection tube

A

Spiral wound

39
Q

These modules are compact units of fine fiber bundles that can be used to collect permeate either radially inward or outward

A

Hollow fiber

40
Q

Separates an aqueous feed with electrolytes into concentrate and diluate through application of an electric field and use of ion selective membranes

A

Electrodialysis

41
Q

Equation used to simplify the theories of both batch and continuous filtration

A

Hagen-Poiseuille Equation

42
Q

Three major groups of filters

A

Cake Filter
Clarifying Filters
Cross flow filters

43
Q

Term commonly used to describe the filtering medium in filtration

A

Septum

CHEM ENG REVIEWER (wag kayong ano) (13 decks)

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