Process for the production of nitrobenzene

Details Process for the production of nitrobenzene Process for the production of nitrobenzene

1986-10-21

1988-09-20

Miller, Edward A.

Organic compounds -- part of the class 532-570 series

Organic compounds

Oxygen containing

C07C 7910

Patent

active

047727578

ABSTRACT:
In the production of nitrobenzene by subjecting benzene to nitration with a mixture of nitric acid and sulfuric acid, separating off the nitrobenzene formed, concentrating the sulfuric acid by evaporation and returning the concentrated sulfuric acid to the bezene nitration stage, the improvement which comprises concentrating sulfuric acid to a concentration of from 75 to 92% by evaporation in vacuo at temperatures in the range from 130.degree. to 195.degree. C. Thereby the energy per kg of water evaporated is drastically reduced compared to processes wherein the sulfuric acid is concentrated to a higher level, without a corresponding loss in efficiency or capacity.

REFERENCES:
patent: 2256999 (1941-09-01), Castner
patent: 3928475 (1975-12-01), Dassel
patent: 4021498 (1977-05-01), Alexanderson et al.
patent: 4064147 (1977-12-01), Thelen et al.
patent: 4091042 (1978-05-01), Alexanderson et al.
patent: 4274910 (1981-06-01), Forter et al.
patent: 4367347 (1983-01-01), Sawicki
patent: 4496782 (1985-01-01), Carr

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