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Class Information
Number: 568/934
Name: Organic compounds -- part of the class 532-570 series > Organic compounds (class 532, subclass 1) > Oxygen containing (e.g., perchlorylbenzene, etc.) > Nitro containing (including aci forms) > Benzene ring containing > Polynitro > Single methyl and plural nitros only bonded directly to benzene ring (e.g., dinitrotoluene, etc.)
Description: Compounds which contain only one methyl group and at least two nitros directly bonded to the benzene ring, with no other substituents on the ring.

Sub-classes under this class:

Class Number Class Name Patents
568/935 Trinitrotoluene 24

Patents under this class:
1 2

Patent Number Title Of Patent Date Issued
8410322 Method for preparing dinitrotoluene Apr. 2, 2013
7928270 Process for distillatively removing dinitrotoluene from process wastewater from the preparation of dinitrotoluene by nitrating of toluene with nitrating acid Apr. 19, 2011
7851661 Method for producing dinitrotoluene Dec. 14, 2010
7511176 Process for the preparation of toluenediamines by catalytic hydrogenation of dinitrotoluenes Mar. 31, 2009
7495136 Process for the production of dinitrotoluene Feb. 24, 2009
7449610 Method for extracting nitrocresols from waste water produced in the manufacture of mononitrotoluene and use of said extract Nov. 11, 2008
7435319 Process for the mild distillative separation of mixtures Oct. 14, 2008
7271300 Picric acid explosive compound and environmentally friendly methods for making the same Sep. 18, 2007
7041858 Process for the production of dinitrotoluene May. 9, 2006
6984762 Process for the two-step production of dinitrotoluene Jan. 10, 2006
6953869 Process for working up secondary components in the preparation of dinitrotoluene Oct. 11, 2005
6936741 Process for working up the waste water obtained in the preparation of dinitrotoluene Aug. 30, 2005
6528690 Adiabatic process for producing dinitrotoluene Mar. 4, 2003
6506948 Toluene extraction of dinitrotoluene wash water Jan. 14, 2003
6291726 Process for nitration of aromatic compounds using a non-acid type nitration process Sep. 18, 2001
6288289 Integrated effluent treatment process for nitroaromatic manufacture Sep. 11, 2001
6258986 Process for the production of dinitrotoluene Jul. 10, 2001
6069277 Amination of electrophilic aromatic compounds by vicarious nucleophilic substitution May. 30, 2000
5948944 Two-stage dinitrotoluene production process Sep. 7, 1999
5902910 Weak acid process for producing dinitrotoluene May. 11, 1999
5874654 Purification of mixtures of nitroaromatic compounds by removing nitrocresols therefrom Feb. 23, 1999
5820764 Treatment/removal of byproduct aqueous effluents comprising hydroxynitro-aromatic compounds Oct. 13, 1998
5762802 Dilute acid oxidation of dinitrotoluene alkaline wash water Jun. 9, 1998
5763696 Removal of dinitrotoluene from process water Jun. 9, 1998
5756867 Recovery of nitric acid from nitration processes May. 26, 1998
5728901 Nitration process which employs water tolerant Lewis acid catalysts Mar. 17, 1998
5696305 Process for the production of nitroaromatic compounds Dec. 9, 1997
5689018 Process for the production of dinitrotoluene Nov. 18, 1997
5679873 Process for the production of dinitrotoluene Oct. 21, 1997
5663462 Process for the production of dinitrotoluene and isomeric mixtures of dinitrotoluene Sep. 2, 1997
5633406 Vicarious nucleophilic substitution using 4-amino-1,2,4-triazole, hydroxylamine or O-alkylhydroxylamine to prepare 1,3-diamino-2,4,6-trinitrobenzene or 1,3,5-triamino-2,4,6-trinitrobenzene May. 27, 1997
5616818 Process for the polynitration of aromatic compounds Apr. 1, 1997
5554299 Treatment/removal of byproduct aqueous effluents comprising hydroxynitroaromatic compounds Sep. 10, 1996
5395995 Process for the preparation and purification of nitroaromatics Mar. 7, 1995
5354924 Process for the production of dinitrotoluene Oct. 11, 1994
5345012 Process for the preparation of dinitrotoluene Sep. 6, 1994
5302763 Process for preparing dinitrotoluene Apr. 12, 1994
5245092 Process for preparing dinitrotoluene with low by-product content Sep. 14, 1993
5237077 Non-pollutional process for producing aromatic nitro compounds without using a mineral acid Aug. 17, 1993
5221440 Process for destruction of nitro-hydroxy-aromatic compounds in aqueous media Jun. 22, 1993
5149890 Process for the isolation of pure dinitrotoluenes Sep. 22, 1992
5099080 Process for preparing dinitrotoluene Mar. 24, 1992
5099079 Process for separating acid from nitro substituted aromatics using a molten nitrate salt Mar. 24, 1992
5099078 Process for preparing dinitrotoluene Mar. 24, 1992
5057632 Process for preparing dinitrotoluene Oct. 15, 1991
5012019 Process for purifying aromatic nitration products Apr. 30, 1991
5001272 Process for the production of dinitrotoluene Mar. 19, 1991
5001286 Process for separating sulphuric acid and nitric acid from dinitrotoluene mixtures obtained during the nitration of toluene Mar. 19, 1991
4996376 Preparation of dinitrotoluenes Feb. 26, 1991
4935557 Conitration of mixed aromatic hydrocarbons Jun. 19, 1990

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