Physical scrubbing is a well-established technology used for CO2 separation from other gases. It is a simple process based on the solubility of CO2 in the physical solvent according to Henry’s Law, i.e., it depends upon pressure and temperature. The solubility of CO2 increases as temperature drops and pressure rises. Therefore, low temperature and high pressure are ideal for CO2 absorption. This process involves no chemical reaction between CO2 and the solvent and is comparable to water scrubbing. Usually, the physical absorption process is considered when the CO2 partial pressure is more than 3.5 bar and bulk removal of CO is required (Ban et al. in Adv Mater Res 917:134–143, 2014 [2]). Depending on their solubility, other components in the gas mixture also get absorbed in the solvent during the process. Regeneration of spent solvent can be done by reducing pressure, inert gas stripping, or thermal regeneration. Minimum energy is required for pressure reduction and inert gas stripping; even if thermal regeneration could use a little bit more energy, it is still far less than other techniques.