METHOD AND DEVICE FOR TREATING NITROSO COMPOUND

The purpose of the present invention is to provide a method which comprises adding an aqueous solution containing a hydrogen halide, e.g., hydrogen chloride or hydrogen bromide, to a liquid to be treated that contains a nitroso compound, such as an aqueous amine solution which was used for absorbing the carbon dioxide contained in a combustion discharge gas, so that the hydrogen halide is present in an amount of 2-20 mol per mol of the nitroso groups contained in the nitroso compound, and subsequently heating the mixture at ordinary pressure and a temperature which is 75°C or higher but not higher than the boiling point of the water. By the method, the nitroso compound is decomposed and the amine is recovered.