Distillation & Separation Flashcards
Separation Processes
A process in which a mixture is separated into individual components or group of components
Why?
Separation Processes
- Product specification
- Recovery
- Purification
Methods
SEPARATION
DISTILLATION
SIEVE
ABSORPTION
EXTRACTION
ADSORBTION
CRYSTALLIZATION
Distillation
It involves a volatile vapor phase and a liquid phase that vaporizes
Absorption
A solute or solutes are absorbed from the gas phase into a liquid phase in absorption.
Adsorption
One or more liquid or gas stream are adsorbed on the surface or in the pores of a solid adsorbent.
Crystallization
Solute components soluble in a solution is removed from the solution by adjusting the conditions
Liquid-liquid Extraction
When a solute or solutes are removed from a liquid phase to another liquid phase
Leaching
Fluid is used to extract a solute from a solid.
Membrane separation
Separation of molecules by the use of membranes that control the rate of
movement of molecules between two phases.
Types of Mixture
Homogeneous
Create another phase
or Add another phase
Types of Mixture
Heterogeneous
Exploit the existing phase difference
Separation of Heterogeneous Mixtures
- Filtration
- Centrifuge
- Floatation by gas bubble
- Settling by Gravity
Phase creation
General Separation Technique
Separation by phase creation
- distillation
- crystallization
- evaporation
Addition
General Separation Technique
Separation by phase addition
e.g. absorption, extraction
barrier
General Separation Technique
Separation by barrier
e.g. reverse osmosis,
gas permeation
solid agent
General Separation Technique
Separation by solid agent.
e.g. adsorption, ion exchange
force field or gradient
General Separation Technique
Separation by force field or gradient.
e.g. electrolysis, centrifugation
Types of Separation Processes
- Equilibrium
Governed - Rate
Governed
Equilibrium
Governed
- Flash
Vaporization - Distillation
- Absorption
Rate
Governed
- Membrane
- Crystallization
- Electrolysis
Concept Of Distillation
a process of physically separating mixtures into two or more products that have different boiling points, by preferentially boiling the more volatile components out of the mixtures.
Why Distillation?
- Continuous
- Relatively cheap
- High capacity
- Efficient
- Easy to scale-up
- No moving parts
Distillation Not suitable for :
- Small volatility difference,
- Small quantity of high boiling component to be recovered from the feed,
- A compound is thermally unstable even under vacuum conditions,
- Mixture is extremely corrosive