Patent ID: 8357827

Claim:
A process for the production of nitrobenzene by adiabatic nitration of benzene with a mixed acid comprising sulfuric acid and nitric acid, the process comprising: (i) introducing the benzene and the mixed acid into a reactor either a) separately with at least one of the benzene or the mixed acid being under a pressure p1 on entry into the reactor or b) together, after being brought into contact with one another, under a pressure p1 on entry into the reactor, (ii) dispersing the benzene and the mixed acid in one another in the reactor with from 1 to 30 dispersing elements, provided that when more than one dispersing element is present, the dispersing elements are arranged one behind the other, (iii) removing reaction product from the reactor, (iv) subjecting the reaction product removed in (iii) to a phase separation in a phase separation apparatus, in which a gas phase pressure p2 prevails in which p1−p2=from 14 bar to 40 bar.