Patent · US Active

Method for removing impurities from dinitrotoluenes

US9738592B2 · kind B2 · utility

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10Claims

0Family size

Assignee

JOSEF MEISSNER GMBH & CO. KG · DE

Inventors

Jürgen Pöhlmann · Cologne, DE
Heinrich Hermann · Cologne, DE
Mirko Händel · Neunkirchen, DE
Jürgen Gebauer · Geldern, DE
Tim Bergmann · Hemer, DE

Key dates

Filing date	Apr 30, 2015
Grant date	Aug 22, 2017
Priority date	—
Expiry date	Apr 30, 2035

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02P20/582
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

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).

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.