Using the state-of-the-art group-contribution SAFT-g Mie equation of state, working within the framework of HiRECORD, a “world’s-first” project to demonstrate a10t/d CO2 capture plant using Rotating-Packed-Bed absorber and desorber with a bespoke designer solvent, we develop models for sulphur dioixide (SO2), nitrogen (II) oxide and nitrogen (IV) oxide, three of the more-important SOx and NOx in this context