Process for the preparation of diphenylamine

Details Process for the preparation of diphenylamine Process for the preparation of diphenylamine

1994-06-15

1995-09-12

Raymond, Richard L.

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

Organic compounds

Amino nitrogen containing

564307, 564402, 564433, C07C20904

Patent

active

054498295

ABSTRACT:
A diphenylamine with both the phenyl groups being substituted is prepared by reacting a phenol with ammonia in the presence of a hydrogen transfer catalyst and a cyclohexanone; or by converting a portion of the phenol to the cyclohexanone in the presence of a hydrogen transfer catalyst and under hydrogen pressure and then reacting the remaining portion of the phenol with ammonia in the presence of the cyclohexanone so converted and the hydrogen transfer catalyst. The diphenylamine can be obtained very efficiently.

REFERENCES:
patent: 3219702 (1965-11-01), Van Verth et al.
patent: 3219704 (1965-11-01), Wilder et al.
patent: 3553268 (1971-01-01), Solomon et al.
patent: 3931298 (1976-01-01), Wollensak
patent: 4804783 (1989-02-01), Nagata et al.
patent: 4952731 (1990-08-01), Nagata et al.
patent: 5196592 (1993-03-01), Immel et al.
patent: 5344987 (1994-09-01), Immel et al.

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