PROCESS FOR THE PREPARATION OF PICRIC ACID

摘要

Prepn. of picric acid comprises nitrating o-nitrophenol and/or p-nitrophenol to dinitrophenols such that the intermediate(s) formed remain soluble in the reaction medium. Nitration is then continued to obtain picric acid which pptes. Either nitric acid or the nitrating mixt. is introduced into the nitrophenol; or the nitrophenol is progressively introduced to the reaction medium comprising nitric acid or the nitrating mixt.; or the nitrophenol and the nitric acid or nitrating mixt. are simultaneously introduced on a first bottoms mixt. comprising water or co-acid. The nitrating mixt. is nitric acid associated with a strong co-acid.