Method for producing amino- or hydroxybenzonitriles

Details Method for producing amino- or hydroxybenzonitriles Method for producing amino- or hydroxybenzonitriles

2005-11-29

2009-12-08

Shiao, Rei-tsang (Department: 1626)

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

Organic compounds

Nitriles

Reexamination Certificate

active

07629486

ABSTRACT:
The invention relates to a method for producing amino- or hydroxybenzonitriles during which, within the scope of an ammonolysis, the corresponding amino- or hydroxybenzoic acid compounds are reacted with ammonia in the presence of a phosphate-containing supported catalyst at temperatures between 250° C. and 500° C. The production step is carried out in a reaction gas without an organic solvent followed by at least a 2-stage purification step.

REFERENCES:
patent: 195 20 491 (1996-12-01), None
patent: EP 745585 (1996-12-01), None
patent: 1 220 386B (1971-01-01), None
patent: 63 243064 (1988-10-01), None
patent: WO-03/097582 (2003-11-01), None
Erben, 1997, CAS: 126:74606.

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