Alkylation of toluenediamine and para-phenylenediamine with isob

Details Alkylation of toluenediamine and para-phenylenediamine with isob Alkylation of toluenediamine and para-phenylenediamine with isob

1988-11-29

1990-04-03

Konopka, Paul E.

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

Organic compounds

Amino nitrogen containing

502 30, 502 31, 502 55, 564305, C07C 8524, C07C 8758, B01J 2938

Patent

active

049142372

ABSTRACT:
This invention relates to an improvement in a fixed bed process for producing tert-butyl-derivatives of aromatic amines, e.g., para-phenylenediamine and toluenediamine by the reaction of isobutylene with the corresponding aromatic diamine in the presence of a highly acidic crystalline alumino-silicate catalyst. The improvement for regenerating the catalyst during operation constitutes adding sufficient water to the catalyst to provide sufficient saturation of the catalyst during the reaction and generally retard the reaction and then substantially decreasing the quantity of added water or reducing the amount of water added.

REFERENCES:
patent: 3546100 (1970-12-01), Yan
patent: 3670030 (1972-06-01), Sparks
patent: 4740620 (1988-04-01), Dixon et al.
patent: 4745223 (1988-05-01), Burgoyne et al.
patent: 4760184 (1988-07-01), Pierantozzi
patent: 4851579 (1989-07-01), Pierantozzi

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