Process for the production of nitrobenzene

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

C - Chemistry, Metallurgy

07

C

260/611

C07C 205/06 (2006.01) C01B 17/88 (2006.01)

Patent

CA 1263873

A PROCESS FOR THE PRODUCTION OF NITROBENZENE A b s t r a c t 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 benzene 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 to 195°C. Thereby the energy per kg of water evaporated is drastically reduced compared to processes wherein the sulfuric acid is con- centrated to a higher level, without a corresponding loss in efficiency or capacity.

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