“…In this context, CCS techniques have been extensively studied in recent years as a mitigation option for reducing anthropogenic CO 2 emissions into the atmosphere. Different technologies are currently available for CO 2 removal from flue gases, including chemical (De Guido et al, 2018) and physical absorption, adsorption (Gutierrez-Ortega et al, 2017), permeation through membranes (Leimbrink et al, 2015) L. Pellegrini et al and low-temperature or commonly referred to as "cryogenic" separation. Recently, a great attention has been devoted to cryogenic separation methods for application not only to natural gas purification (De Guido et al, 2015) and biogas upgrading (Pellegrini et al, 2017), but also to nitrogen rejection (De Guido et al, 2019) and CO 2 capture from flue gas.…”