Patent ID: 8212080

Claim:
A method of producing xylylenediamine which comprises the following steps: (1) an ammoxidation step of ammoxidizing xylene by a vapor phase catalytic reaction with ammonia and an oxygen-containing gas in the presence of a catalyst, thereby producing an ammoxidation gas containing dicyanobenzene; (2) an absorption step of contacting the ammoxidation gas with an organic solvent directly, thereby absorbing dicyanobenzene in the organic solvent; (3) a removal step of low-boiling compounds wherein the dicyanobenzene-containing solution from the absorption step is distilled, to remove compounds having a boiling point lower than that of dicyanobenzene together with the organic solvent partly or completely and obtain a molten dicyanobenzene; (4) a dissolution step of dissolving the molten dicyanobenzene from the removal step of low-boiling compounds in a liquid ammonia solvent or a mixed solvent of at least one aromatic hydrocarbon and liquid ammonia; (5) a solid-liquid separation step of removing insolubles in the solution from the dissolution step partly or completely; and (6) a hydrogenation step of hydrogenating dicyanobenzene in the solution from the solid-liquid separation step in liquid phase in the presence of a catalyst.