| abstract |
The invention relates to a continuous method for producing nitrobenzene by nitriding benzene by means of nitric acid or mixtures of nitric acid and sulfuric acid to form raw nitrobenzene, washing the raw nitrobenzene by means of at least one acidic, alkaline, and neutral wash, respectively, wherein a prepurified nitrobenzene is obtained, comprising at least light boilers, optionally medium boilers, and high boilers and salts in addition to nitrobenzene, wherein the prepurified nitrobenzene is further purified by separating light boilers in a distillation apparatus by evaporating the light boilers and separating nitrobenzene from the further purified nitrobenzene thus obtained in a distillation apparatus by partially evaporating nitrobenzene, wherein pure nitrobenzene is removed from the distillation apparatus in gaseous form and then condensed, and wherein the non-evaporated part of the further purified nitrobenzene is fed back into the wash at an arbitrary point. |