Catalytic Synthesis of Monomers for Heat-Resistant Polymers

Abstract

In order to intensify the process of catalytic synthesis of m- and p-xylylenediamine - valuable intermediate synthesis of polymer materials were conducted hydrogenation reactions of isophthalo-, terephthalonitriles with promoted catalysts based on Ni-Raney alloys Ni : Al = 1 : 1 in an alcoholic medium under a hydrogen pressure in the presence of ammonia. It is established, that the activity of the catalyst Ni-Nbsk was 2-3 times higher than Ni-Tisk and Ni-Mgsk and 4-5 times higher than the activity of Ni-Raney (Nisk). It is shown that in aliphatic alcohols (1-4) in a ratio of nitrile: ammonia = 1: 3 (g/g), P (H2) = 4.0 MPa and T = 80 ° output of m-, p-xylylenediamine is on Ni-Nbsk catalyst 95-97 % . With increasing molecular weight of the alcohol the hydrogenation rate of izoftalo-, tereftalnitrile in a solvent decrease.