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Absorption - Coggle Diagram
Absorption
Gas absorption
Chemical reaction in the liquid phase
Remove a substance from the gas by contacting to liquid
Heaviest component present in significant amounts
Gas contains a carrier
Carrier is not absorbed
Carrier is highly volatile
Carrier is present in constant quantity
The process
Gas and liquid brought together in suitable contacting apparatus
Both phases reach equilibrium
Gas and liquid phase separated
Transfer of component(s) of interest from gas to liquid depends on
Component concentration in gas and liquid
Mass transfer coefficient of the component in each phase
Solubility of the component in the liquid
Interfacial area for mass transfer
Controlling
Liquid mass-transfer film
Low solubility of the gas solute
Gas mass-transfer film
Highly soluble gas
The double film theory
The bulk of the mixture or gas concentration is constant
Very good mixing
Thin film either side of the meniscus with laminar flow whilst main bulk is turbulent
No lateral migration of the fluid
Operating lines
The assumptions
Heat of absorption is negligible
Isothermal operation
Non-volatile solvent
Solvent constant flow rate
Insoluble carrier gas
Constant flowrate
Adding a liquid solvent to separate
Stripping = insoluble gas is the separating agent