Patent ID: 9132380
Filing Date: 2015-09-15
Classification: B01D,Y02C

Abstract:
1. A method of decomposing nitrosamines contained in a nitrosamine-laden aqueous amine solution obtained through scrubbing of carbon dioxide from flue gases with an amine-containing circulating washing fluid, which comprises the steps of: (a) branching off a substream of the nitrosamine-laden aqueous amine solution from the washing fluid circulation and concentrating the nitrosamine-laden aqueous amine solution by evaporating water and low boiling constituents therefrom; (b) retaining the concentrated nitrosamine-laden aqueous amine solution at its boiling point in which a liquid phase and a vapor phase are in contact, to establish a vapor/liquid equilibrium between the liquid phase and the vapor phase; (c) irradiating the vapor phase with ultraviolet light to decompose the nitrosamines entering the vapor phase to obtain a concentrated aqueous amine solution from which the nitrosamines have been removed; and (d) recycling the concentrated aqueous amine solution from which the nitrosamines have been removed back to the circulating washing fluid.