Physical absorption of a gas or part of a gas mixture in a liquid solvent involves the mass transfer that occurs at the interface between the gas and the liquid and the rate at which the gas diffuses into the liquid. Physical absorption of gases in a liquid solvent depends on the following parameters: solubility of the gases and the pressure and temperature conditions.
Although emerging technologies, such as zero-emission power plant, significantly reduce the complexity of sep- arating CO2 , many other industrial processes still emit substantial amounts of carbon dioxide which needs to be separated; CO2 separation and capture technologies will continue to evolve. Membrane process as energy- saving, space-saving, easy to scale-up, could be the future technology for CO2 separation.