Class 568/935 - Trinitrotoluene

Subclass of Class 568 - Organic compounds -- part of the class 532-570 series
Definition: Compounds which contain methyl group in the one position
No. of patents: 24
Last issue date: 09/09/2008

Number	Title	Issue Date
7423187	Recovery of TNT and RDX from bulk composition B explosives A continuous process for the separate recovery of TNT and RDX from a mixture of TNT and RDX. The mixture is introduced into a first vessel wherein TNT is separated from the RDX by use of a solvent that is effective for dissolving TNT but not RDX. The TNT in solvent ...	09/09/2008
7345208	Method for making an energetic material A method for making trinitrotoluene is described, and which includes the steps of providing a source of aqueous nitric acid having a concentration of less than about 95% by weight; mixing a surfactant with the source of aqueous nitric acid so as to dehydrate the aqu...	03/18/2008
7303732	Tubular reactor having static mixing elements separated by coalescing zones A tubular reactor characterized by having short static mixing elements separated by coalescing zones is used to conduct multiphase liquid/liquid reactions. Small droplets of one of the phases are dispersed into the other phase by the static mixing elements. These dr...	12/04/2007
7271300	Picric acid explosive compound and environmentally friendly methods for making the same An environmentally friendly picric acid explosive comprising, providing a nitromalondialdehyde, providing a dinitroketone, reacting the nitromalondialdehydes with the dinitroketone to produce a mixture, and subjecting the mixture to a cyclodehydrative mechanism to p...	09/18/2007
6881871	Trinitrotoluene (TNT) and environmentally friendly methods for making the same An environmentally friendly methods for making 2,4,6-trinitrotoluene (TNT) compounds comprising, providing nitromalondialdehydes, providing dinitro-compounds, reacting the nitromalondialdehydes with the dinitro-compounds to produce aldol-intermediate compounds, and ...	04/19/2005
5874654	Purification of mixtures of nitroaromatic compounds by removing nitrocresols therefrom Environmentally-polluting nitrocresol values are removed from admixtures of nitroaromatic compounds comprised thereof, notably the media of nitration of aromatic compounds by reacting same with aqueous HNO3 /H2 SO4, by fir...	02/23/1999
5847240	Process for reducing tetranitromethane in compositions containing nitroaromatic compounds A process is disclosed for removing a light organic compound from a liquid composition comprising said light organic compound in admixture with a nitroaromatic compound, said light organic compound having a partial vapor pressure in said composition that ...	12/08/1998
5616818	Process for the polynitration of aromatic compounds An aromatic compound is polynitrated in a continuous process in a single apparatus under adiabatic conditions in an emulsion as the reaction medium. From 1.3 to 3.5 mol of HNO3 per mol of aromatic compound are introduced in the form of a nitron...	04/01/1997
5395995	Process for the preparation and purification of nitroaromatics A process for the preparation and purification of nitroaromatics by nitration of the corresponding aromatics and subsequent melt crystallization. The residual melts which occur are recycled....	03/07/1995
5149890	Process for the isolation of pure dinitrotoluenes Pure or substantially enriched 2,4- and 2,6-dinitrotoluene can be isolated from a mixture containing these isomers if such a mixture is distilled under a pressure of 0.5 to 20 mbar at a temperature of 80° to 200° C. with exclusion of reducing conditions...	09/22/1992
5099079	Process for separating acid from nitro substituted aromatics using a molten nitrate salt Described herein is a process for separating an acid impurity from a solution containing acid and a nitro substituted aromatic compound by contacting the solution with at least one molten nitrate salt....	03/24/1992
4361712	Cyanide reduction in nitroaromatic process The invention relates to a method of eliminating or substantially reducing the amount of cyanide formed in a polynitroaromatic, e.g. dinitrotoluene process. The invention comprises removing the nitrophenolic material from the mononitroaromatic formed in a...	11/30/1982
4300001	Desensitized TNT; its preparation and use The explosive 2,4,6-trinitrotoluene (TNT) is desensitized by dissolving it in oleum of from 10 to 40% (by weight) in strength. The solutions formed preferably contain at least 400 g and at most 480 g of dissolved TNT per liter of oleum in oleum of 20-25% ...	11/10/1981
4258224	Process for recovering TNT isomers A process for recovering pure 2,4,6-trinitrotoluene (TNT) from a crude TNT ixture containing unsymmetrical TNT isomers which comprises forming a homogeneous powder of the crude TNT and silica gel, introducing said powder at the top of a silica gel packed c...	03/24/1981
4250294	Polymers obtained from polynitroaromatic compounds A polymer having aromatic or heterocyclic rings as the only structural elements said aromatic or heterocyclic rings containing at least two nitro groups is disclosed as well as a method of preparing the same. The polymers are useful as binding agents for ...	02/10/1981
4073726	Removal of trinitrotoluene from aqueous media There is provided a process for removing trinitrotoluene from waste water resulting from the manufacture of trinitrotoluene, the process comprising forming an admixture of the waste water and an amino group containing compound of the formula (Cn	02/14/1978
4047989	Method for the recovery of blasting oil from effluents from the production of nitroglycerine-containing explosives Blasting oil contained in the effluent from the production of explosives containing nitroglycerine is recovered by extracting with nitroaromatics which make part of the final explosive, the resulting extract being used completely in the explosive producti...	09/13/1977
4022844	Process for continuous production of trinitrotoluene An improved process for the continuous production of trinitrotoluene by dinitrating and trinitrating mononitrotoluene in the presence of concentrated nitric acid and concentrated sulphuric acid or fuming sulphuric acid, which is characterised in that the ...	05/10/1977
4003977	Removal of tetranitromethane from TNT plant waste gases A method of removing tetranitromethane from waste gases (e.g., from trinitrotoluene plants) by scrubbing the waste gases with a mixture of 1 an alkali metal hydroxide, 2 water, and 3 a liquid alcohol. Most of the tetranitromethane is converted into a solu...	01/18/1977
4003953	Purification of TNT with magnesium sulfite-bisulfite mixtures Crude TNT is purified by heating with an aqueous mixture of magnesium sulfite and magnesium bisulfite, whereby TNT is recovered in high yield and purity. The spent aqueous solution can be furnaced to recover magnesium oxide, which can be recycled to the p...	01/18/1977
4001373	Removal of tetranitromethane from TNT plant waste A method of removing tetranitromethane from waste gases (e.g., from trinitrotoluene plants) by scrubbing the waste gases with a solution of (1) water, (2) hydrogen peroxide, and (3) an alkali metal hydroxide or alkali metal carbonate. Tetranitromethane is...	01/04/1977
3981934	Method for drying trinitrotoluene Aqueous trinitrotoluene is dried by means of air which is passed through the melted trinitrotoluene by passing the melted trinitrotoluene over a porous area and forcing hot air from below through the porous area and the melted material. The porous area is...	09/21/1976
3956409	Process for purifying TNT Unsymmetrical TNT isomers are removed from solid or molten crude TNT by treatment with aqueous ammonium sulfite. The yield of purified TNT is significantly greater by treatment with aqueous ammonium sulfite than with conventional sodium sulfite ("sellite"...	05/11/1976
3949008	Purification of crude dinitrotoluene by extraction with C₅ -C₈ alkanes 2,4- AND 2,6-Dinitrotoluenes mixed with small amounts of isomeric dinitrouene impurities are extracted with an alkane of 5 to 8 carbon atoms, whereby the isomeric dinitrotoluene impurities are removed....	04/06/1976

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Class 568/935 - Trinitrotoluene