FIELD: chemical and electrochemical industry; processing of chloro-substituted biphenyls, benzenes and naphthalines; purification of transformer, condenser and motor oils against additives on the base of polychloroaromatic compounds being added into these oils. SUBSTANCE: method is carried out in the presence of catalysts and reduction agent $$$ in ethanol or in ethanol-toluene medium (their ratio being 60:40) at 20-40 C, $$$ is 1 atm, molar ratio of chloroaromatic component, catalyst and $$$ is 1:0.03-50:1-350, respectively. Catalyst comprises 1-8 % of Ni or Ni being promoted by Pd (its quantity being 2-10 % in respect to Ni) and supported on carbon carrier. EFFECT: improved efficiency. 4 cl, 1 tbl
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