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| Number | Title | Issue Date |
| 7928270 | Process for distillatively removing dinitrotoluene from process wastewater from the preparation of dinitrotoluene by nitrating of toluene with nitrating acid A process is proposed for distillatively removing dinitrotoluene from process wastewater from the preparation of dinitrotoluene by nitrating toluene with nitrating acid, which comprises basifying the process wastewater to a pH of >... | 04/19/2011 |
| 7851661 | Method for producing dinitrotoluene The present invention provides a process for preparing dinitrotoluene, comprising the steps of a) reacting toluene with nitric acid in the presence of sulphuric acid to give mononitrotoluene, b) separating the reac... | 12/14/2010 |
| 7495136 | Process for the production of dinitrotoluene Dinitrotoluene is produced by nitration of toluene with nitrating acid (mixture of nitric acid and sulfuric acid) in which, in a first stage, the toluene is converted to mononitrotoluene (MNT) and then the mononitrotoluene is converted in a second stage to dinitroto... | 02/24/2009 |
| 7449610 | Method for extracting nitrocresols from waste water produced in the manufacture of mononitrotoluene and use of said extract The invention provides a process for removing nitrocresols from wastewater of mononitrotoluene preparation, which comprises acidifying the alkaline wastewater of mononitrotoluene preparation with acids to a pH of at most 3 and treating the nitrocresols with an extra... | 11/11/2008 |
| 7435319 | Process for the mild distillative separation of mixtures The invention relates to a semibatchwise process for the mild distillative separation of mixtures, in a first stage a column being supplied continuously with a feed and the feed being separated at least into different fractions, one of the fractions being removed co... | 10/14/2008 |
| 7273599 | Method for decoloring sulfuric acid A method for decoloring sulfuric acid containing organic reatives by which it is possible to obtain a crystalline sulfuric acid having a color index of less that 30 APHA unities, by adding controlled amounts of potassium chlorate and hydrogen peroxide in a controlle... | 09/25/2007 |
| 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 |
| 7227147 | Process for monitoring and controlling nitrating processes with the aid of an online spectrometer A process for monitoring and/or controlling a nitrating process, having the following steps: measuring inline infrared spectra of nitric acid content in a reaction mixture stream downstream of the nitration reaction, preferably nea... | 06/05/2007 |
| 7122701 | Process for preparing aromatic amines Aromatic amines are produced from aromatic hydrocarbons by a) reacting the aromatic hydrocarbon(s) with a mixture of nitric acid and sulfuric acid to generate a two-phase reaction mixture, b) separating the reactio... | 10/17/2006 |
| 7067024 | Reduced sensitivity, melt-pourable TNT replacements This melt-pourable explosive composition shares explosive properties comparable to those of trinitrotoluene and is melt-pourable and castable under conditions comparable to those of trinitrotoluene, but experiences equal or less impact, shock, and thermal sensitivit... | 06/27/2006 |
| 6984762 | Process for the two-step production of dinitrotoluene The invention relates to a process for the production of dinitrotoluene by the two-stage nitration of toluene. In the first stage of this process, toluene was reacted adiabatically with nitrating acid so that at least 90% of the toluene was reacted off and no more t... | 01/10/2006 |
| 6964714 | Reduced sensitivity, melt-pourable tritonal replacements This melt-pourable explosive composition shares explosive properties comparable to those of Tritonal and is melt-pourable and castable under conditions comparable to those of Tritonal, but experiences equal or less impact, shock, and thermal sensitivity and avoids t... | 11/15/2005 |
| 6953869 | Process for working up secondary components in the preparation of dinitrotoluene The present invention relates to a process for working up organic secondary components which are formed in the one-stage or two-stage nitration of toluene to dinitrotoluene. These organic secondary components are present in the acidic and alkaline waste water from t... | 10/11/2005 |
| 6936741 | Process for working up the waste water obtained in the preparation of dinitrotoluene The present invention relates to a process for working up or treating aqueous waste waters which are formed during the nitration of toluene to dinitrotoluene with nitrating acid. These aqueous waste waters containing acidic wash water and alkaline wash water from th... | 08/30/2005 |
| 6906231 | Aromatic nitration reactions A process for the nitration of an aromatic compound, wherein the aromatic compound is admixed with a nitrating agent in the presence of an ionic liquid is described. The method for the nitration of aromatic compounds in (e.g. neutral) ionic liquids has advantages ov... | 06/14/2005 |
| 6528690 | Adiabatic process for producing dinitrotoluene Dinitrotoluene (DNT) is produced by the adiabatic nitration of toluene with nitric acid at a temperature of from about 60 to about 200° C. and at a molar ratio of toluene to nitric acid of from about 1:1.5 to about 1:3.0. The reaction mixture thus-obtain... | 03/04/2003 |
| 6506948 | Toluene extraction of dinitrotoluene wash water This invention relates to an improvement in a process for the production of dinitrotoluene and particularly to the recovery of dinitrotoluene and organic by-products from the wastewater and wash waters generated in the process. Wastewater and wash water s... | 01/14/2003 |
| 6291726 | Process for nitration of aromatic compounds using a non-acid type nitration process The nitration of aromatic compounds is achieved in high yield and selectivity by using oxygen activated by an inorganic catalyst and nitrogen dioxide. Since this process uses neither concentration nitric nor sulfuric acids, the generation of spent waste a... | 09/18/2001 |
| 6288289 | Integrated effluent treatment process for nitroaromatic manufacture An integrated process for treating alkaline wash water effluent from nitroaromatic manufacture, principally containing nitro-hydroxy-aromatic compounds is described. The integrated process concentrates the alkaline wash water to recover chemicals and wate... | 09/11/2001 |
| 6258986 | Process for the production of dinitrotoluene Dinitrotoluene is produced by nitrating toluene with nitrating acid under adiabatic conditions in a manner such that some mononitrotoluene is present in reaction mixture. The nitration reaction mixture is then treated to remove at least 5% by weight of wa... | 07/10/2001 |
| 6069277 | Amination of electrophilic aromatic compounds by vicarious nucleophilic substitution The present invention relates to a process to aminate electrophilic aromatic compounds by vicarious nucleophilic substitution of hydrogen using quaternary hydrazinium salts. The use of trialkylhydrazinium halide, e.g., trimethylhydrazinium iodide, as well... | 05/30/2000 |
| 5948944 | Two-stage dinitrotoluene production process A multi-step process for producing DNT employing a mononitration step in a single liquid phase at an elevated temperature using a carefully controlled amount of water, followed by a phase separation step prior to dinitration of the MNT present in the resu... | 09/07/1999 |
| 5902910 | Weak acid process for producing dinitrotoluene This invention relates to an improved process for the production of dinitrotoluene wherein one is able to effectively employ a feed sulfuric acid, which is referred to as "weak acid" as the feed sulfuric acid for the nitration facility. The weak acid conc... | 05/11/1999 |
| 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 |
| 5820764 | Treatment/removal of byproduct aqueous effluents comprising hydroxynitro-aromatic compounds Objectionable byproduct aqueous effluents containing contaminating amounts of hydroxynitroaromatic compounds, in particular those aqueous effluents produced during the synthesis of nitroaromatic compounds, e.g., dinitrotoluenes, via reaction of an aromati... | 10/13/1998 |
| 5763696 | Removal of dinitrotoluene from process water Reduction of dinitrotoluene impurity in water is achieved by distillation in the presence of nitric acid. A suitable process for such reduction comprises (a) contacting said composition with nitric acid to provide a nitric acid-containing composition, (b)... | 06/09/1998 |
| 5762802 | Dilute acid oxidation of dinitrotoluene alkaline wash water A process for removing nitrocresols in a crude aqueous alkaline dinitrotoluene wash stream derived by nitration of toluene using a mixed acid technique followed by treatment with aqueous alkaline material in which the crude aqueous alkaline dinitrotoluene... | 06/09/1998 |
| 5756867 | Recovery of nitric acid from nitration processes A process for the removal and recovery of nitric acid, sulphuric acid and nitrous oxide (NOx) from crude dinitrotoluene (DNT) obtained by nitrating with a nitrating acid, a benzene derivative selected from the group consisting of tolulene or mo... | 05/26/1998 |
| 5728901 | Nitration process which employs water tolerant Lewis acid catalysts A process for preparing a nitrated arene which comprises reacting an arene and nitric acid in the presence of a water tolerant Lewis acid catalyst under process conditions sufficient to form the nitrated arene and recovering the nitrated arene. Suitable L... | 03/17/1998 |
| 5696305 | Process for the production of nitroaromatic compounds Nitroaromatic compounds are produced by continuously reacting an aromatic compound with nitrating acid. The reaction mixture is separated into an organic phase from which the desired nitroaromatic compound is recovered and an acid phase. The acid phase is... | 12/09/1997 |
| 5689018 | Process for the production of dinitrotoluene Dinitrotoluene is produced from toluene and nitric acid in the presence of sulfuric acid in a two stage process in the first stage, toluene and nitric acid are reacted under isothermal conditions in amounts such that mononitrotoluene is produced. The reac... | 11/18/1997 |
| 5679873 | Process for the production of dinitrotoluene Dinitrotoluene is produced in a two-stage process from toluene and nitric acid in the presence of sulfuric acid under adiabatic conditions in the presence of nitrating acids made up of specified components. The reaction product of the first phase is separ... | 10/21/1997 |
| 5663462 | Process for the production of dinitrotoluene and isomeric mixtures of dinitrotoluene Dinitrotoluene and isomer mixtures of dinitrotoluene are produced in a single stage, continuous process by nitrating mononitrotoluene or an isomer mixture of mononitrotoluene in which the ortho-mononitrotoluene content is low with a nitrating acid made up... | 09/02/1997 |
| 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 The present invention relates to a process to produce 1,3-diamino-2,4,6-trinitrobenzene (DATB) or 1,3,5-triamino-2,4,6,-trinitrobenzene (TATB) by: (a) reacting at ambient pressure and a temperature of between about 0° and 50° C. for between about 0.1 an... | 05/27/1997 |
| 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 |
| 5554299 | Treatment/removal of byproduct aqueous effluents comprising hydroxynitroaromatic compounds Objectionable byproduct aqueous effluents containing contaminating amounts of hydroxynitroaromatic compounds, in particular those aqueous effluents produced during the synthesis of nitroaromatic compounds, e.g., dinitrotoluenes, via reaction of an aromati... | 09/10/1996 |
| 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 |
| 5354924 | Process for the production of dinitrotoluene Aromatic nitration reactions and, more specifically, a process for nitrating toluene to produce dinitrotoluene in the absence of any dipolar aprotic solvent.... | 10/11/1994 |
| 5345012 | Process for the preparation of dinitrotoluene A continuous process for the preparation of isomeric mixtures of dinitrotoluene by a single stage nitration of toluene under adiabatic conditions. The reaction enthalpy is used for the removal by distillation of the water of reaction formed during nitrati... | 09/06/1994 |
| 5302763 | Process for preparing dinitrotoluene Improved process for preparing dinitrotoluene by reacting toluene with concentrated nitric acid. The process reacts toluene with a large excess of concentrated nitric acid, in the presence of a select hydrated nitrate salt which is effective in minimizing... | 04/12/1994 |
