Catalytic hydrogeneration of nitrobenzene to 4-aminodiphenylamin

Details Catalytic hydrogeneration of nitrobenzene to 4-aminodiphenylamin Catalytic hydrogeneration of nitrobenzene to 4-aminodiphenylamin

1997-06-10

1999-11-02

Dees, Jose' G.

Organic compounds -- part of the class 532-570 series

Organic compounds

Amino nitrogen containing

564398, 564408, 564420, 564421, 564423, 564433, 564434, C07C20900, C07C21100

Patent

active

059774118

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 improved yields and selectivities. The invention further provides for various embodiments of the foregoing which are suitable for the production of 4-ADPA, and the hydrogenation or reductive alkylation to produce PPD. Important to the invention are the molar ratios of aniline to nitrobenzene and nitrobenzene to the strong organic base and the choice and use of hydrogenation catalyst.

REFERENCES:
patent: 5117063 (1992-05-01), Stern et al.
patent: 5453541 (1995-09-01), Stern et al.

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