industrial best practices for dispersion
TRANSCRIPT
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Guide of Industrial Dispersion Best Practices
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Basic concepts
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Basic concepts
Important for the Donut effect
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Dispersion
Micronized solids
Energy
Viscous liquid medium
High shear stress
Dispersion
Solid particles : DisaggregatedWeted surfaceUniformely distributed
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The dipersion process
Agglomerates Aggregates
More easier to break agglomerates Aggregates won’t be dispersed by disc Particule size < 1 µm but after dispersion it’s difficult to be inferior at 40/50 µm
Agglomerates : when particles are joined loosely together which can be simply broken by mechanical forces
Aggregates: assembly of particles bonded strongly
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The dipersion process
Dispersion
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The Donut Effect
• The geometry of the dispersion container• The disc diameter• The peripheral velocity : 18 – 25 m/s• The height of the dissolver disc above the bottom of the vessel
Key parameters:
Definition When vortex allows seing the interior part of disc but not teeth Ideal mode for dispersion Important to keep a laminar flow and not turbulent flow
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Flux patern Planetary system
1 path 5/6 path 1’
Translation movment
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Types of blades
Standard Low /medium viscosity
Liquid product
Increase axial capacity
High mixing capacity Only for mixingDispersion capacity
Can improve incorporation or dispersion
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Comparative agitation /dispersion
Better dispersion
Better agitation
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Thermal balance
Process
High shear stress = Exothermic reaction
Final temperature product
Important to control the temperature during the process
Correctors to decrease temperature :
• Avoid unnecessary dispersion effective
• Raw Materials addition = dilution effective
• Heating/ Cooling jacket effective
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Teeth of disc and impact on the dispersion
12
Used disc
New disc
20 mm
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To choose the better height improve the dispersion
Better vortex
Adjustable height
Telescopic shaft
Donut effect