DAY 2 UNIT OPS 1

Question 1

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

Answer 1

Fluidization

Question 2

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

Answer 2

fixed bed

Question 3

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

Answer 3

Minimum fluidizing velocity

Question 4

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

Answer 4

moblized bed

Question 5

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

Answer 5

Fixed

Question 6

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

Answer 6

fluidized

Question 7

Beyond terminal settling velocity, bed is ______

Answer 7

mobilized

Question 8

Describes how spherical particles are

Answer 8

sphericity

Question 9

amount of mass per unit bed volume

Answer 9

bulk density

Question 10

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

Answer 10

Carman-Kozeny equation

Question 11

Accounts for kinetic energy losses and is dominant during turbulent flow

Answer 11

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

Question 12

Terminal settling velocity is counteracted by _______

Answer 12

superficial velocity

Question 13

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

Answer 13

Flitration

Question 14

The clear liquid that passed through the filter

Answer 14

Filtrate

Question 15

Solids accumulated on the filter

Answer 15

Filter cake

Question 16

Rate of filtrate collection can be described by what equation

Answer 16

Ruth Equation

Question 17

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

Answer 17

Constrant Rate Filtration (CRF)

Question 18

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

Answer 18

CPF (Constant pressure filtration)

Question 19

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

Answer 19

Pressure driven filter

Question 20

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

Answer 20

Vacuum driven filter type

Question 21

Most common pressure filter

Answer 21

Plate and frame

Question 22

most common vacuum filter

Answer 22

rotary vacuum filter

Question 23

Composed of several filter leaves arranged inside a horizontal tank

Answer 23

Leaf Filter or Shell-and-Leaf Filter

Question 24

Type of filter that cancbe operated continuously

Answer 24

rotary vacuum filter

Question 25

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

Answer 25

Doctor blade

Question 26

Rotary vacuum filters work under A. CPF B. CRF

Answer 26

CPF

Question 27

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

Answer 27

Membrane separation

Question 28

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

Answer 28

Permeate

Question 29

Refers to the components retained by the membrane

Answer 29

Retentate

Question 30

Solids deposited on the membrane surface

Answer 30

Membrane fouling

Question 31

rate of permeate extraction per unit area

Answer 31

Flux

Question 32

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

Answer 32

Backflushing

Question 33

Membrane separation that can isolate all proteins

Answer 33

Ultrafiltration

Question 34

Can selectively separate some minerals from the feed

Answer 34

nanofiltration

Question 35

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

Answer 35

Reverse osmosis

Question 36

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

Answer 36

Tubular

Question 37

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

Answer 37

Flat sheet

Question 38

These are flat membranes enclosed in a central collection tube

Answer 38

Spiral wound

Question 39

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

Answer 39

Hollow fiber

Question 40

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

Answer 40

Electrodialysis

Question 41

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

Answer 41

Hagen-Poiseuille Equation

Question 42

Three major groups of filters

Answer 42

Cake Filter Clarifying Filters Cross flow filters

Question 43

Term commonly used to describe the filtering medium in filtration

Answer 43

Septum