FIELD: chemical industry. SUBSTANCE: method is carried out by reacting amino compound with phosgen. Gaseous phase of amino compound (A) of formula I: H2N-R-NH2 (I) wherein R is aromatic C6-C10 unit unsubstituted or substituted by one or more C1-C10 units, is contacted with phosgen under such conditions so that Reynolds number of mixture of agents is at least 8000 in contact zone, contacting being made in tubular reactor which has no stirring means. EFFECT: simplified process. 13 cl, 2 ex
