Patent ID: 9233910
Filing Date: 2016-01-12
CPC Classification: C07C

Claim Text:
1. A process for producing aniline by gas-phase hydrogenation of nitrobenzene and subsequent purification of the aniline, comprising: obtaining a gaseous crude reaction product, which is subjected to fractional condensation such that at least two liquid process products are obtained, wherein the at least two liquid process products include at least one partial condensate (PK) and a total condensate (TK), carrying out a condensation leading to the formation of PK at a temperature that is higher than the condensation temperature leading to the formation of TK, passing a product stream originating from PK and a product stream originating from TK into a distillation column comprising at least two sections, comprising at least one stripping section and at least one rectifying section, introducing the product stream originating from PK into a lower section of the distillation column between a lowermost stripping section and a section which follows, and introducing the product stream originating from TK into a top portion of the distillation column above an uppermost rectifying section, and withdrawing distilled aniline in a side stream between the lowermost stripping section and the uppermost rectifying section of the distillation column.