| 摘要 |
PURPOSE: A method for preparing a benzidine compound is provided, to obtain a benzidine compound from a nitrobenzene compound by hydrogenation without using an organic solvent for reducing a cost, an environmental pollution and an accident due to the treatment of an organic solvent and simplifying the process. CONSTITUTION: The method comprises the steps of mixing sodium hydroxide, 2,3-dichloro-1,4-naphthoquinone, a surfactant, a nitrobenzene compound represented by the formula 2, a process water and a noble metal catalyst, reacting the mixture at a temperature of 60-150 deg.C. with injecting a nitrogen gas and supplying a hydrogen gas with a pressure 3-15 kg/cm3 in vacuum state to prepare a hydrazobenzene compound represented by the formula 3 by hydrogen reduction; filtering the reduction solution to collect a catalyst; and adding a HCl solution to the resultant and applying potential to prepare a benzidine compound represented by the formula 1, wherein R is H, a methyl group, a methoxy group or Cl. Preferably the catalyst is a Pt/C catalyst.
|
