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| Number | Title | Issue Date |
| 8158830 | Integrated process for the preparation of tetraaminobenzene An integrated process is provided for preparing 1,2,4,5-tetraminobenzene and salts thereof, starting in certain embodiments with nitration of 1,3-dihalobenzene. The process design eliminates costly intermediate drying and recrystallization steps. Handling of solid m... | 04/17/2012 |
| 8071812 | Process for the synthesis of 1,3-diamino-4,6-dinitrobenzene A process is provided for the preparation of 1,3-diamino-4,6-dinitrobenzene by amination of 1,3-dihalo-4,6-dinitrobenzene. The presence of water advantageously results in a highly pure product, free or essentially free of glycol ether impurities. ... | 12/06/2011 |
| 8030522 | Process for the production of toluene diisocyanate The invention relates to a process for the production of toluene diisocyanate, in which the crude toluenediamine obtained from the hydrogenation is purified and then phosgenated. The purification step reduces the total amount of cyclic ketones to less than 0.1% by w... | 10/04/2011 |
| 7541497 | Method for producing xylylenediamine (XDA) A process for preparing xylylenediamine, comprising the steps of ammoxidizing xylene to phthalonitrile, by contacting the vaporous product of the ammoxidation stage directly with a liquid organic solvent (quench), and hydrogenating the phthalonitrile in the resultin... | 06/02/2009 |
| 7504539 | Process for preparing 4-aminodiphenylamine intermediates The invention is directed to a method of producing one or more 4-aminodiphenylamine intermediates comprising the steps: a. bringing an aniline or aniline derivative and nitrobenzene into reactive contact; and b. re... | 03/17/2009 |
| 7381844 | Hydrogenation process of chlorinated nitrobenzene A hydrogenation process of chloronitrobenzene. The hydrogenation process comprises the steps of producing a nanosized boron-containing nickel catalyst, wherein a ratio of the amount of the boron atom to the amount of the nickel atom in the nanosized boron-containing... | 06/03/2008 |
| 7282610 | Method of producing aromatic amine compound having alkylthio group A method of producing an aromatic amine compound, that includes reducing an aromatic nitro compound that has an aromatic ring having an alkylthio group as a substituent, to obtain a corresponding aromatic amine compound, wherein the aromatic nitro compound is reduce... | 10/16/2007 |
| 7235694 | Process for preparing 4-aminodiphenylamine A process for preparing 4-aminodiphenylamine having the steps of reacting nitrobenzene and aniline in the presence of a complex base catalyst, hydrogenating the reaction mixture with hydrogen, a powdery composite catalyst, and a hydrogenation solvent; separating, re... | 06/26/2007 |
| 7217750 | Process for incorporating one or more materials into a polymer composition and products produced thereby The present invention relates to various processes that utilize one or more supercritical fluids to disperse various inorganic and organic materials, including crystalline materials, into polymeric compositions, substrates or pre-formed articles without the utilizat... | 05/15/2007 |
| 7183439 | Process for preparing 4-aminodiphenylamine intermediates The invention is directed to a method of producing one or more 4-aminodiphenylamine intermediates comprising the steps: a. bringing an aniline or aniline derivative and nitrobenzene into reactive contact; and b. re... | 02/27/2007 |
| 7176333 | Process for preparing 4-aminodiphenylamine The present invention discloses a process for preparing 4-aminodiphenylamine, which process uses nitrobenzene and aniline as raw materials, a complex base catalyst as condensation catalyst and a powdery composite catalyst as hydrogenation catalyst, and comprises fiv... | 02/13/2007 |
| 7109378 | Monolith catalytic reactor coupled to static mixer The invention pertains to an improved apparatus comprised of a monolith catalytic reactor having an inlet and an outlet and a static mixer having an inlet and an outlet thereto with the outlet of said static mixer in communication with the inlet of said monolith cat... | 09/19/2006 |
| 7084302 | Process for preparing 4-aminodiphenylamine A process for preparing 4-aminodiphenylamine using nitrobenzene and aniline as raw materials, a complex base catalyst as the condensation catalyst, and a powdery composite catalyst as the hydrogenation catalyst. The process has 5 process stages including condensatio... | 08/01/2006 |
| 7084313 | Three stage processes for the separation of supercritical or near-critical mixtures Processes for separating supercritical or near-critical mixtures containing hydrogen, a solvent gas, methanol and a fatty alcohol under an initial pressure of from 100 to 300 bar are described, wherein the processes comprise: (a) reducing the pressure of such a mixt... | 08/01/2006 |
| 6998366 | Thin layer catalysts based on Raney alloys, and method for the production thereof Raney alloy catalysts applied to a support are described, said catalysts having an extremely thin layer of Raney alloy with a thickness of 0.01 to 100 μm. These catalysts are prepared by vapor deposition of the appropriate metals under reduced pressure. They are ge... | 02/14/2006 |
| 6706924 | Process for the production of 1,5-naphthalenediamine The invention relates to a process for the production of 1,5-naphthalenediamine and to the intermediates 4-(2-nitrophenyl)butyronitrile, 5-nitro-3,4-dihydro-1(2H)-naphthyl-imine, 5-nitroso-1-naphthylamine, 5-nitro-1-naphthylamine, 4-(2-aminophenyl)-butyronitrile, 5-... | 03/16/2004 |
| 6657085 | Process for the preparation of aniline compounds A process for the preparation of aniline compounds of formula: ##STR1## wherein n and R are as defined in claim 1, by reacting nitro compounds of formula: ##STR2## wherein n and R are as defined, with hydrazine at elevated temperature in the prese... | 12/02/2003 |
| 6653509 | Method for the liquid-phase hydrogenation of organic materials A catalyst which consists of amorphous carbon with molecular planes that have curved surfaces and contain six-membered and non-six-membered carbon rings, optionally having at least one catalytically active, low-valency metal covalently bound thereto. Meth... | 11/25/2003 |
| 6509503 | Process for preparing pesticidal intermediates The invention relates to processes for the preparation of compounds of formula (I) wherein R1 and R2 each independently represent a halogen atom.... | 01/21/2003 |
| 6462238 | Process for the reduction of cyano-substituted sulfones to aminoalkylene-substituted sulfones Disclosed is a process for selectively reducing a nitrile containing organic compound that also contains a sulfone moiety, the nitrile being reduced to a primary amine.... | 10/08/2002 |
| 6448446 | Synthesis of N,N-disubstituted-p-phenylenediamine An improved synthesis of N,N,-disubstituted-p-phenylene-diamine (DSPDA) preferably di-n-butyl-p-phenylenediamine is disclosed. The improvement rests on the discovery that DSPDA and its salts are extremely sensitive to oxygen so that once the product DSPDA... | 09/10/2002 |
| 6441235 | Preparation of 5-amino-isophthalamides A process for preparing 5-amino-N,N'-bis(R)isophthalamides, where A is 2,3-dihydroxypropyl or 1,3-dihydroxyisopropyl, useful as intermediates in preparing iodinated diagnostic agents, which comprises reacting a di-lower-alkyl 5-nitroisophthalate with a co... | 08/27/2002 |
| 6414192 | Process for preparing 4-aminodiphenylamine The invention provides a process for preparing 4-aminodiphenylamine, an important starting product for synthesizing antioxidants and stabilizers in the rubber and polymer industry, by hydrogenating nitrosobenzene with hydrogen in the presence of a proton ... | 07/02/2002 |
| 6278022 | Process for the preparation of insecticidal phenylhydrazine derivatives Disclosed herein is an improvement in a method for making compounds having the structural formulae (I) or (II): ##STR1## wherein: X is a) phenyl; lower phenylalkoxy; phenoxy; or benzyl; or b) one substituent from group a) and one or more substituents sele... | 08/21/2001 |
| 6262307 | Shaped, activated metal, fixed-bed catalyst A shaped, activated metal, fixed-bed catalyst with a pore volume of 0.05 to 1 ml/g and an outer activated layer consisting of a sintered, finely-divided, catalyst alloy and optionally promoters. The catalyst alloy has metallurgical phase domains, resultin... | 07/17/2001 |
| 6258982 | Process for the preparation of substituted aromatic amino compounds The present invention relates to a hydrogenation process for the preparation of aromatic amino compounds containing directly on the aryl ring or in a side chain one or more entities that may also undergo hydrogenation, such as carbon multiple bonds, nitri... | 07/10/2001 |
| 6242649 | Continuous method for producing aromatic amines A continuous process for the preparation of aromatic di- and/or polyamines by catalytic hydrogenation of the corresponding aromatic di- and/or polynitro compounds with hydrogen, characterized in that, in a reactor with a catalytic fixed bed or trickle bed... | 06/05/2001 |
| 6232501 | Process for the cis-selective catalytic hydrogenation of cyclohexylidenamines This invention relates to a process for the cis-selective preparation of cyclic amines of the sertraline type by reductive alkylation of cyclic immines or of their precursors and for the catalytic hydrogenation in the presence of copper-containing catalys... | 05/15/2001 |
| 6156933 | Supercritical hydrogenation Process for the selective hydrogenation of alphatic or aromatic substrates under supercritical or near critical conditions. Hydrogenation is effected using a heterogeneous catalyst in a continuous flow reactor containing a supercritical or near critical r... | 12/05/2000 |
| 6140538 | Process for preparing 4-aminodiphenylamines A process for preparing an optionally substituted 4-aminodiphenylamine comprising reacting an optionally substituted aniline and an optionally substituted nitrobenzene in the presence of water and a base while controlling the water content so as to ensure... | 10/31/2000 |
| 6087480 | Process for preparing sparingly soluble aromatic amines Preparation of sparingly soluble aromatic amines by catalytic hydrogenation of the corresponding aromatic nitro compounds in the presence of hydrogen, a solvent and a catalyst having a particle size of not less than 0.5 mm, wherein the aromatic nitro comp... | 07/11/2000 |
| 6069278 | Aromatic diamines and polyimides based on 4,4'-bis-(4-aminophenoxy)-2,2' or 2,2',6,6'-substituted biphenyl This invention relates the novel diamines, the polyimide oligomers and the polyimides derived therefrom and to the method of preparing the diamines, oligomers and the polyimides. The thermoplastic polyimides derived from the aromatic diamines of this inve... | 05/30/2000 |
| 6054617 | Nitro compound-reducing process The invention concerns a process for the reduction of nitro groups to amino groups, characterized that a nitro compound is reacted with hydrogen in the presence of an aqueous solution of a water-soluble metal catalyst of the formula M (L)n (Y) | 04/25/2000 |
| 6034276 | Process for preparing 1-chloro-2,4-diaminobenzene Disclosed is an improved process for preparing 1-chloro-2,4-diaminobenzene by the selective hydrogenation of 1-chloro-2,4-dinitro-benzene wherein the hydrogenation is carried out in the presence of a modified Raney nickel catalyst containing about 70 to 9... | 03/07/2000 |
| 6011178 | Process for the preparation of 2-amino-4,5,3',4'-tetramethoxybenzophenone 2-Amino-4,5,3',4'-tetramethoxybenzophenone of the formula: ##STR1## is prepared by mononitration of 3,3',4,4'-tetramethyoxybenzophenone using nitric acid in the presence of acetic acid, and subsequent reduction of the nitro group. The compound is an ... | 01/04/2000 |
| 5994584 | Process for the preparation of 4-aminodiphenylamine 4-Aminodiphenylamines are prepared by hydrogenating nitrosobenzene or mixtures of nitrosobenzene and nitrobenzene with hydrogen in the presence of fluorides and heterogeneous catalysts in inert aprotic solvents at temperatures from 0 to 200° C. and press... | 11/30/1999 |
| 5932768 | Process for the preparation of 4-aminodiphenylamine 4-aminodiphenylamines are prepared by hydrogenating nitrosobenzene or mixtures of nitrosobenzene and nitrobenzene with hydrogen in the presence of bases containing hydroxide, oxide and/or alkoxide groups and heterogeneous catalysts in inert aprotic solven... | 08/03/1999 |
| 5925791 | Process for producing 4-aminodiphenylamine 4-aminodiphenylamines are produced by hydrogenating nitrobenzene with hydrogen in the presence of bases containing hydroxide and/or oxide groups and heterogeneous catalysts and in the presence of inert aprotic solvents at temperatures of 0 to 200° C. and... | 07/20/1999 |
| 5907061 | Nitro- and aminobenzamide compounds for neurodegenerative disorders A group of benzamide compounds are disclosed which are useful for treating neurodegenerative disorders. Methods for making these compounds are provided. These materials are formed into pharmaceutical compositions for oral or intravenous administration to ... | 05/25/1999 |
| 5861533 | Process for nitrosation of C-H-acidic compounds A process for nitrosating C-H-acidic compounds. The process substantially avoids producing polluted wastewater.... | 01/19/1999 |
