To safely obtain the subject compound in a high yield by carrying out phosgenation of an aromatic polyamine in a gaseous phase in the presence of phosgene which is excess by a specific ratio without using a large excess of phosgene.
(A) At least one kind of compound containing at least two primary amine functional groups and at least one aromatic group, preferably a compound of the formula H2N-R-NH2 (R is an aromatic group which may be substituted with preferably a 1-6C alkyl, aryl or the like) (e.g. toluenediamine or xylenediamine) is brought into contact with (B) phosgene in an amount of 0-100 wt.%, preferably 5-60 wt.% stoichiometric excess based on the number of mole of amine functional group of the component A in a mixed reactor containing a first homogenizing zone constituting 20-80 wt.% total volume of the reactor and a second zone whose flow is close to piston flow, constituting 20-80 wt.% of total volume thereof.
ANRI SHIARERI
DONI RUBERAN
PASUKARU BAKIYU
