A process for preparing 4-aminodiphenylamine

Details A process for preparing 4-aminodiphenylamine A process for preparing 4-aminodiphenylamine

C - Chemistry, Metallurgy

07

C

C07C 211/55 (2006.01) C07C 209/38 (2006.01)

Patent

CA 2361222

The invention provides a process for preparing 4- aminodiphenylamine, an important starting product for synthesizing antioxidants and stabilizers in the rubber and polymer industry, by hydrogenating nitrosobenzene with hydrogen in the presence of a proton acid as catalyst and in the presence of a hydrogenating catalyst, optionally in the presence of an inert organic solvent and thermally decomposing the 4- ADPA ammonium salt produced in this way, wherein 4-ADPA is obtained. 4-aminodiphenylamine is produced in good yields and high purity by the process according to the present invention. Furthermore, no effluent is produced, which makes the process particularly economic and ecological.

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