Technological aspects of the reductive amination of benzaldehyde with ammonia in the absence of solvents are discussed. The reaction kinetics in a slurry reactor was experimentally studied in order to maximize the yield of benzylamine. Effects of reaction conditions and type of solid catalyst on the content of undesirable by-products were investigated. In particular, benzyl alcohol and trimers of benzylimine, namely, hydrobenzamide and 2,4,5-triphenyl-4,5-dihydro-1H-imidazole, were found as significant by-products. The formation of poorly soluble high-boiling trimers of benzylimine was minimized by semi-batch arrangement of the process with continuous addition of benzaldehyde into the load of benzylamine, ammonia, and Raney-Ni catalyst. Some important features of benzaldehyde amination, which make it less advantageous for benzylamine production compared to the benzonitrile hydrogenation, are described.