PURIFICATION PROCESS FOR BENZENE AND TOLUENE THROUGH EXTRACTIVE AZEOTROPIC DISTILLATION

摘要

specific disclosure.the present invention is directed to a process forthe separation of benzene, toluene and / or mixtures containing themthe saturated hydrocarbon with at least a paraffinic or cyclaniquethe extractive distillation in a distillation zone.the presence of an extraction solvent consisting essentially ofn - aliphatic amide. in order to reduce the loss ofthe solvent is introduced into the apparatus, the liquid waterin the part of the zone situated between the distillationinjection of extraction solvent and the head of the area -distillation, amount and under conditions such that the watercan be completely vaporized in that part of thethe distillation zone is substantially without diluting solvent.the steam condenses and separates the head from the condensatein the two liquid phases, a first phase liquid containing essaturated hydrocarbons and a second main phasethe liquid containing mainly water vapor condensed.