Fluidization Flashcards
These compounds are chlorinated to alkyl chlorides in a single fluidized form.
Olefins
Naphthalene is oxidized by air to form phthalic anhydride in a bubbling fluidized reactor. What kind of reaction does this produce?
Exothermic Reaction
This compound is produced by reacting propylene, ammonia, and oxygen (air) in a single fluidized bed of a complex catalyst.
Acrylonitrile
They developed a successful Fischer-Tropsch synthesis reactor based on a dilute-phase transport-reactor concept
Kellogg Co.
The purpose of fluidized beds in the production of polyethylene prevents _____ since the unit is operated near the melting point of the product
hot spots
This is normally carried out in a fluidized bed to achieve mixing of the gasses and temperature control.
Homogeneous Reactions
This category covers the greatest commercial use of fluidized beds other than fluid catalytic cracking.
Heterogeneous Reaction
Use of fluidized bed that is advantageous for close control conditions so that a predetermined amount of free moisture may be left with the solids to prevent dusting of product during subsequent material handling operations
Drying
This process uses fluidized beds of thermoplastic resins to facilitate the coating of metallic parts. A properly prepared, heated metal part is dipped into the fluidized bed, which permits complete immersion in the dry solids.
Coating
When a fluid is passed downwards through a bed of solids, no relative movement between the particles takes place, unless the initial orientation of the particles is
Unstable
When can we consider the bed fluidized?
If the velocity is then increased further, the individual particles separate from one another and become freely supported in the fluid
A type of fluidization when the bed continues to expand as the velocity particles increase and it maintains its uniform character, with the degree of agitation of particles increasing progressively.
Particulate Fluidization
A type of fluidization when a gas, uniform fluidization is frequently obtained only at low velocities. At higher velocities two separate phases may form. A continuous phase is often referred to as the dense or the _______.
Emulsion Phase
When gas bubbles pass through a relatively high-density fluidized bed the system closely resembles a boiling liquid, with the lean phase corresponding to the vapour and the dense or continuous phase corresponding to the liquid
Boiling Bed
As the superficial velocity approaches the minimum fluidizing velocity, the bed starts to___.
The bed starts to expand and when the particles are no longer in physical contact with one another the bed is fluidised.
If the velocity is now increased again, what is to be expected to the curve (FE).
If the velocity is increased again, it might be expected that the curve (FE) would be retracted and that the slope would suddenly change from 1 to 0 at the fluidising point.
