Catalytic hydrogeneration of nitrobenzene to 4-aminodiphenylamine in the presence of a hydroxyl compound and a solvent (US Patent 5977411)

Patent number: 5977411 Granted: 1999-11-02 Filed: 1997-06-10 Inventors: Antonio L. DeVera (Ballwin, MO, US) Assignees: Flexsys America L.P. (Akron, OH, US)

Abstract

This invention provides a method for preparing 4-ADPA by charging nitrobenzene into a reaction zone under hydrogen pressure in the presence of a strong organic base and a catalyst for hydrogenation. The method provides the convenience and economy of a one-step process, while producing