Process for preparing and purifying p-phenylenediamine

Details Process for preparing and purifying p-phenylenediamine Process for preparing and purifying p-phenylenediamine

1978-01-10

1980-03-04

Doll, John

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260205, 260208, C07C 8526

Patent

active

041917081

ABSTRACT:
Highly pure p-phenylenediamine can advantageously be prepared on a commercial scale by separating and removing o-aminoazobenzene produced as a by-product in the step of producing p-aminoazobenzene, from the product mixture before p-aminoazobenzene is reduced in a process for preparing p-phenylenediamine which comprises preparing p-aminoazobenzene from aniline by way of diazoaminobenzene and then reducing p-aminoazobenzene.

REFERENCES:
patent: 2708680 (1955-05-01), Richmond
patent: 2809884 (1957-10-01), Ratje
patent: 3093649 (1963-06-01), Ratje et al.
patent: 3149162 (1964-09-01), Gardner et al.
Fierz-David et al., "Dye Chemistry", 5th Ed., pp. 34-40 (1949).
Beilstein's Handbook, 2nd Supplement, Band 16, pp. 147-151.
Handbook of Chemistry & Physics, 58th Ed., p. C-133.

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