PURPOSE: To prepare the titled compound useful as a synthetic raw material of a surface active agent, adhesive and amineimide compound, and pesticide, etc., easily, in high yield and purity, by reacting a tertiary amine with the reaction mixture of ammonia water and sodium hypochlorite.

CONSTITUTION: The reaction mixture of ammonia water and sodium hypochlorite is obtained by adding sodium hypochlorite to ammonia water while cooling the system to 0°C or below. The reaction mixture is made to react with a tertiary amine (e.g. trimethylamine, N,N,N'N'-tetra-methylethylenediamine, N-methylmorpholine, triethylenediamine, etc.) at -10W+20°C to obtain the objective compound. The reaction is carried out by adding the reaction mixture dropwise to the tertiary amine (or its aqueous solution). The amount of the tertiary amine is nearly equimolar to the chloroamine contained in the reaction mixture, or 0,9W1.1 times mole of the chloroamine.