| abstract |
Claimed is prepn. of nitrophenols by a. continuous introduction of phenol and nitric acid (0.5-2.0, pref. 0.9-1.5, mole/mole phenol) into a closed reactor contg. an aq. soln. comprising nitric acid (5-40, pref. 10-25, wt.%); nitrous acid (5-40, pref. 10-20, %, based on nitric acid; nitrophenols (up to their solubility limit in the medium), b. continuous removal of p- and o-nitro-phenol (in the ratio of at least 55:45), at pref. 10-40 deg.C and pref. an autogenous pressure of 0.1-0.5 M.Pa. |