METHOD OF EXTRACTING DRY ANILINE FROM NITROBENZENE GAS-PHASE CATALYTIC HYDROGENATION PRODUCT Russian patent published in 2017 - IPC C07C211/46 C07C209/82 C07C209/36 

FIELD: chemistry.

SUBSTANCE: method comprises the condensation of aniline and water, separation of excessive hydrogen from the condensate, separation of condensate into aniline water and raw aniline, extraction of aniline from aniline water by azeotropic rectification and drying of the raw aniline. A distinctive feature of the method lies in the fact that for the drying of raw aniline the dispersed water from the raw aniline is desorbed with a vapour-gas mixture, obtained during nitrobenzene catalytic hydrogenation with an initial temperature of 150-170°C at a pressure close to atmospheric and during feeding of the vapour-gas mixture and the raw aniline by countercurrent. If necessary, the dry raw is additionally desorbed with a make-up hydrogen with an initial temperature of 40-100°C after desorption with a vapour-gas mixture.

EFFECT: method increases the energy efficiency of the process while maintaining high output and quality of the product.

2 cl, 1 tbl, 2 ex