METHOD AND DEVICE FOR SEPARATING CARBON DIOXIDE FROM A GAS STREAM AND FOR REMOVING DEGRADATION PRODUCTS IN THE WASHING MEDIUM BY PHOTOLYTIC DECOMPOSITION

摘要

The invention relates to a method for separating carbon dioxide from a gas stream, in particular from a flue gas stream. According to the invention, a gas stream is brought into contact with a washing medium in an absorber (3) of a separation device (1, 71, 101) and the carbon dioxide contained in the gas stream is separated; the charged washing medium is supplied to a desorber (5) of the separation device (1, 71, 101) to release the carbon dioxide; a vapor stream is removed from the desorber (5) and is supplied to a cooling unit (21) to form a condensate; degradation products, in particular nitrosamines, contained in at least a partial stream (27) of the condensate are photolytically decomposed to decomposition products; at least the decomposition products, in particular nitrites and amines, are removed; and at least a partial stream (38) of the condensate is returned to the desorber (5). The invention further relates to a corresponding separation device (1, 71, 101) for separating carbon dioxide from a gas stream.