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US 6,586,645 B2Granted
Continuous adiabatic process for preparing nitrochlorobenzene
AssigneeBayer Aktiengesellschaft
InventorsRalf Demuth, Bernd-Michael König, Thomas Linn, Hans-Joachim Raatz, Hans-Martin Weber, Eberhard Zirngiebl, Ricarda Leiberich
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Abstract
The present invention relates to a continuous adiabatic process for preparing nitrochlorobenzene, in which the waste sulfuric acid produced during the practice of the process is reconcentrated and recycled into the nitration reaction.
Claims10
A process for the continuous preparation of nitrochlorobenzene comprising reacting chlorobenzene with sulfuric acid, nitric acid, and water, wherein
- (a) the feedstocks chlorobenzene, sulfuric acid, nitric acid, and water are introduced simultaneously or successively into a reactor equipped with mixing elements and are mixed at an average mixing power density of 1.5 to 40 watt/liter and at a reaction mixture temperature during initial mixing of 10 to 50° C.,
- (b) the content of sulfuric acid in the reaction mixture during mixing, based on the sum of sulfuric acid, nitric acid, and water, is 70 to 80% by weight,
- (c) the reaction proceeds under adiabatic conditions,
- (d) at the reactor outlet, the crude nitrochlorobenzene is separated from the waste sulfuric acid, and
- (e) the waste sulfuric acid is reconcentrated to the original content of sulfuric acid and recycled into the nitration reaction.
2 more elements
Dependencies are inferred from the claim text.