Process for the preparation and isolation of HBN

Details Process for the preparation and isolation of HBN Process for the preparation and isolation of HBN

1990-12-03

1992-12-08

Dees, Jose G.

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

Organic compounds

Nitriles

C07C25314

Patent

active

051699729

ABSTRACT:
In a process for the preparation and the isolation of p-hydroxybenzonitrile (HBN), in which a p-halogenated phenol is reacted with cuprous cyanide in a suitable solvent, the reaction mixture obtained after the reaction of the p-halogenated phenol with cuprous cyanide has been substantially completed is contacted with an aqueous solution of a bromide salt and, optionally, an organic diluent, the aqueous and organic phases are separated, HBN is distilled out from the organic phase, an alkali metal cyanide is added to the aqueous phase and CuCN is filtered off from the resulting aqueous phase.

REFERENCES:
patent: 1672253 (1928-06-01), Giles
patent: 2591415 (1952-04-01), Engelhardt et al.
patent: 3259646 (1966-07-01), Harris et al.
patent: 4925642 (1990-05-01), Stollar et al.

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