Crystallization Flashcards
Crystallization
Solid-fluid separation process where the solid particles are formed from a homogeneous phase.
Crystal
highly organized type of matter
Solubility
*parts solute / 100 parts solvent
*maximum amount of solute that can be dissolved in a given amount of a solvent at a given temperature.
Supersaturation
Quantity of solids actually present in the solution compared to the quantity that is in equilibrium with the solution.
Homogeneous or Primary Nucleation
*Molecules may come together and associate into a cluster.
*If supersaturation is high enough
Heterogeneous Nucleation
*Contact Nucleation
*Formation of new nuclei is due to the interference of the contacting agent (walls of the container or agitator blades)
Secondary Nucleation
*Contact Nucleation
*Formation of new nuclei occurs in collisions between crystals.
What are the mechanisms of crystallization?
- Cooling
- Evaporation
- Adiabatic (Vacuum Evaporation)
CRYSTALLIZATION MECHANISM:
Oslo Crystallizer
Evaporation
CRYSTALLIZATION MECHANISM:
Vacuum Crystallizers
Adiabatic Evaporation with Cooling
*Heat sensitive
CRYSTALLIZATION MECHANISM:
Swenson-Walker Crystallizers
Cooling
CRYSTALLIZATION MECHANISM:
Agitated Batch Coolers
Cooling
CRYSTALLIZATION MECHANISM:
Pan Coolers
Cooling
Crystallizer using Evaporation
Oslo Crystallizer
MSMPR
*Mixed-Suspension Mixed-Product Removal
*Basis for identifying kinetic parameters *Applied to calculate the performance of the crystallizer.