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US 2010/0076230 A1Published application
Continuous process for the manufacture of nitrobenzene
AssigneeBayer MaterialScience AG
InventorsThomas Knauf, Alexandre Racoes, Wolfgang Dohmen, Andreas Rausch
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Abstract
The invention relates to a continuous process for the manufacture of nitrobenzene. This process comprises the nitration of benzene with nitrating acid that contains at least 3.0 wt. % of nitric acid and at least 67.0 wt. % of sulfuric acid, in a reaction space in which the start temperature of the reaction is above 100.0° C. but below 102.0° C. In addition, this process requires that the benzene and the nitrating acid are dispersed in one another several times.
Claims5
A continuous process for the manufacture of nitrobenzene comprising
- (1) nitrating benzene with a nitrating acid in a reaction space in which said benzene and said nitrating acid are dispersed in one another several times, wherein:
- a) said nitrating acid contains at least 3.0 wt. %, based on 100 wt. % of said nitrating acid, of nitric acid and at least 67.0 wt. % of sulfuric acid, based on 100 wt. % of said nitrating acid;
- b) the starting temperature of the reaction is above 100.0° C. but below 102.0° C.;
- c) the emulsion of said nitrating acid and said benzene which is obtained after the first dispersion is redispersed at least 4 times before the nitric acid conversion is 60%;
- and
- d) at least 60% of said nitric acid used is converted within the first 13 vol. % of the reaction space after the first dispersion.
3 more elements
Dependencies are inferred from the claim text.