Abstract: A multi-refrigerant cooling system comprising a cooling circuit (100) for circulation of a refrigerant mixture. The cooling circuit comprises, i.a., one or more separator(s) (102, 103) configured to separate and withdraw a respective refrigerant fraction of the refrigerant mixture. Each separator is connected to a respective holding tank (201, 202). Each holding tank is further connected to the cooling circuit via a supply conduit (207), the supply conduit being configured to supply one or more refrigerant fraction(s) to the cooling circuit. Method for adjusting the composition of a refrigerant mixture of a multi-refrigerant cooling system. The method allows adjustment of the composition of the refrigerant mixture during operation of the multi-refrigerant cooling system.

Abstract: Method for operating a frosting vessel of an anti-sublimation system for capturing CO2 from a gas stream. During defrosting of CO2 ice present in the frosting vessel CO2 gas is removed from the frosting vessel. Anti-sublimation system for capturing CO2 from a gas stream. Said anti-sublimation system comprises a frosting vessel and means for removing CO2 gas from the frosting vessel. Said means is adapted to remove CO2 gas during defrosting of CO2 ice present in the frosting vessel. Flue gas treatment system comprising one or more heat exchangers for lowering the temperature of the flue gas and one or more scrubbers for removing contaminants from the flue gas. Said flue gas treatment system further comprises the above-mentioned anti-sublimation system.