Method for removing impurities from dinitrotoluenes

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United States of America Patent

PATENT NO 9738592
APP PUB NO 20170166514A1
SERIAL NO

15323800

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Abstract

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The present invention relates to a method for purifying raw dinitrotoluenes resulting from dinitration of toluene in the presence of a nitric acid/sulfuric acid/nitrating acid mixture, and a device or plant for performing the method, and a corresponding production plant for producing dinitrotoluene, characterized in that (a) the raw dinitrotoluenes are first subjected to a wash with at least one washing medium after separation of the nitrating acid mixture, followed by a separation of the washing medium; and that (b) subsequently the washed dinitrotoluenes resulting from method step (a) are subjected to stripping (stripping gas treatment) with at least one gas (stripping gas).

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Patent Owner(s)

  • JOSEF MEISSNER GMBH & CO. KG

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Bergmann, Tim Köln, DE 10 65
Gebauer, Jürgen Geldern, DE 7 1
Händel, Mirko Neunkirchen-Seelscheid, DE 5 1
Hermann, Heinrich Köln, DE 16 62
Pöhlmann, Jürgen Köln, DE 9 3

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