Abstract: The Kinetic of the liquid phase hydrogenation reaction of 2-nitro-2`-hydroxy-5` methylazobenzene on skeleton nickel in aliphatic alcohol with the addition of water and sodium hydroxide at different initial concentration of an original compound has been studied. It is established that one of the intermediate reaction products along with N-oxide 2-2`-hydroxy-5`-methylphenylbenztriazol is 2-nitro-2`hydroxy-5`-methylhydroazobenzene which in the presence of sodium hydroxide in the volume of the solution is cyclisized into N-oxide. High selectivity on 2-2`-hydroxy-5`-methylphenylbenztriazol cam be achieved at high concentration of NAB-H2 adsorption complexes and high cyclization of 2-nitro-2`hydroxy-5`-methylhydroazobenzene into N-oxide 2-2; hyodrxy-5`methylphenylbenztriazol that is due to the presence of catalytic amount of sodium hydroxide in the volume of the solution