Process for the preparation of para-nitrophenol
AssigneeRhone-Poulenc Chimie
InventorMichel Desbois
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Abstract
A process for the preparation of para-nitrophenol by bringing a phenyl ester of an inorganic acid into contact with a nitrating agent in the presence of liquid hydrofluoric acid and a hydrolysis of the nitrated product obtained is carried out either simultaneously or in sequence with the nitration.
Claims12
A process for the preparation of para-nitrophenol comprising the steps of nitrating a phenyl ester of an inorganic acid with a nitrating agent selected from nitric acids with a minimum concentration of 65%, alkali metal salts of nitric acid and nitronium salts, in the presence of liquid hydrofluoric acid at a temperature ranging from -20.degree. C. to 150.degree. C., and hydrolyzing the nitrated product obtained by said nitration reaction, said hydrolysis being carried out simultaneously with said nitration reaction or said hydrolysis being carried out sequentially with said nitration reaction.
The process of claim 9, wherein the molar ratio of the nitrating agent to the number of equivalents of phenyl radicals in the ester ranges from 1:1 to 1.2:1.
Dependencies are inferred from the claim text.