Method for reducing the formation of by-product dinitrobenzene in the production of mononitrobenzene
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United States of America Patent
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Dec 10, 2013
Grant Date -
Sep 8, 2011
app pub date -
Nov 14, 2008
filing date -
Nov 14, 2008
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Abstract
A method for making mononitrobenzene using a plug flow reactor train. Benzene, nitric acid and sulfuric acid are introduced into the reactor and produced mononitrobenzene is removed at an outlet end. All of the benzene and at least part of the sulfuric acid are introduced at the inlet end of the reactor. A first portion of the nitric acid is introduced by a first nitric acid feed into the inlet end and a second portion of the nitric acid is introduced at one or more additional feeds that are spaced between the inlet end and the outlet end. The method results in reduced formation of by-product dinitrobenzene, improving the reaction yield of mononitrobenzene while avoiding the need for a distillation step.
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