ACID CLEANING METHOD OF NITROGEN-CONTAINING ORGANIC COMPOUND

PROBLEM TO BE SOLVED: To propose an acid cleaning method of a nitrogen-containing organic compound, firstly, with which a hardly-decomposable nitrogen-containing organic compound can be cleaned and decomposition-treated, and secondly, which is simply, easily, and surely achieved.SOLUTION: In an acid cleaning method, a nitrogen-containing organic compound is cleaned and decomposition-treated by imparting high-speed and strong stirring shear force thereto in an acidic aqueous solution, and a surface activating machine 1 is used. The surface activating machine 1 comprises: a disk-like stirring plate 4 with high-speed rotation installed in a stirring chamber 3 formed in a cylindrical drum 2; and a stirring blade 5 that is provided on a plate face of the stirring plate 4 in a protruding condition. The nitrogen-containing organic compound flows inside the surface activating machine 1 together with the acidic aqueous solution and interfacial energy is transiently increased by imparting the stirring shear force thereto. Consequently coordination of a hydrogen ion to a lone pair which is an unshared electron pair of the nitrogen atom of the nitrogen-containing organic compound, and other reactions are accelerated.