| 摘要 |
<p>PURPOSE:In preparing the titled substance useful as an intermediate for synthesizing a raw material compound of polyurethane resin by catalytic hydrogenation of dinitrotoluene, to improve yield, by carrying out the reaction by the use of a reactor of tank type with a stirrer in a specific solvent under a given condition. CONSTITUTION:In hydrogenating catalytically dinitrotoluene, a reactor of tank type with a stirrer is used, tolylenediamine containing 0-20wt% water is used as a solvent, dinitrotoluene as a raw material is fed from the line A to the reactor 1 at <=10kg/cm<2>G, preferably at 5-9kg/cm<2>G. The retention time of the fed raw material is >=4hr, preferably 5-7hr. As formed water by the reaction is continuously distilled away as vapor from the reaction product into the separated water storage tank 8, the reaction is carried out at 90-150 deg.C, preferably at 100-130 deg.C with stirring. The prepared reaction solution is continuously filtered by the filter 3, sent to the reservoir container 9, to obtain the desired compound.</p> |
