Preparation method of tert-octylamine

The invention relates to the field of chemistry and chemical engineering, and particularly discloses a preparation method of tert-octylamine. By taking acetonitrile and diisobutylene as raw materials, and N-tert-octyl acetamide is prepared through amidation reaction under the action line of concentrated sulfuric acid and a phase transfer catalyst by adopting a solvent-free method; and hydrolysis reaction is carried out on N, N-tert-octyl acetamide in a sodium hydroxide aqueous solution, and distilling an organic phase of a reaction product to obtain tert-octyl amine. The amidation reaction adopts the phase transfer catalyst, so that the amidation yield is improved, and the total yield of tert-octylamine can reach 95% or above; the amidation reaction adopts a solvent-free method, and the acetamide hydrolysis reaction takes water as a solvent, so that the solvent loss and the solvent recovery cost are reduced, and the pollution to the environment is reduced; and the comprehensive utilization of the materials in