The invention discloses a method for preparing
amantadine by adopting ammonolysis reaction, which belongs to the field of
chemical synthesis process, and comprises the following steps: S1, carrying out
nitration reaction on
adamantane, concentrated
nitric acid and
dichloroethane under the action of a catalyst; s2, adding a catalyst, organic amines and
ammonia gas into an ammonolysis reactor, then dropwise adding a nitrified
dichloroethane solution, and carrying out ammonolysis reaction to obtain a
mixed solution; s3, introducing all the
mixed solution in the step S2 into a rectifying
tower for rectification to obtain
ammonia gas, unreacted organic amine and
dichloroethane; and S4, crystallizing and filtering the
tower kettle material obtained after rectification in the step S3 to obtain a crude
amantadine product, and refining to obtain the
amantadine product. The total yield of the amantadine prepared by the method disclosed by the invention reaches 74-78%. The method has the beneficial effects that the steps are simple, the operation is easy, the
energy consumption is low, the yield of amantadine is improved, and the purity of the obtained product is high.