In the hydrogenation reaction, nitrile compounds not only generate the target product primary amine but also by-products secondary amine and tertiary amine. The benzylamine and dibenzylamine generated by the hydrogenation of BN discussed above can also continue to react to form toluene. To avoid the occurrence of side reactions, an alkali additive can be added to the reaction, and then the effect of ammonia concentration in the solution on the yield of benzylamine was tested. As in Fig. , we first used pure methanol reagent as the reaction solvent, and only obtained a conversion rate of 20.33% and a selectivity of 50.69%, indicating the necessity of alkali additives for the reaction. As the concentration of ammonia in the methanol solution increases from 2-7 mol/L, especially, it can be intuitively seen that when the ammonia methanol is 7 mol/L, it has a significant effect on the improvement of the substrate conversion rate, which increases significantly from 34.19% at 2 mol/L to >99% at 7 mol/L. Then 7 mol/L ammonia methanol solution was decided as the solvent for subsequent condition exploration.