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| Number | Title | Issue Date |
| 7973192 | Preparation of both hexamethylene diamine and aminocapronitrile Hexamethylenediamine and aminocapronitrile are simultaneoussly produced by hemihydrogenation of adiponitrile, which includes a stage of separation of the hexamethylenediamine from the hydrogenate by distillation of the hexamethylenediamine, the distillation of the h... | 07/05/2011 |
| 7875740 | Iron-containing material suitable for use as hydrogenation catalyst The iron-containing catalyst suitable for use as a catalyst contains a) iron or a mixture containing iron and an iron-based compound. The iron has an average crystallite size ranging from 1-35 nm measured by X-ray diffraction. ... | 01/25/2011 |
| 7385074 | Method for the hemihydrogenation of dinitriles in order to form aminonitriles The present invention relates to the hemihydrogenation of dinitriles to corresponding aminonitriles. ... | 06/10/2008 |
| 7268413 | Bipolar transistors with low-resistance emitter contacts Many integrated circuits include a type of transistor known as a bipolar junction transistor, which has an emitter contact formed of polysilicon. Unfortunately, polysilicon has a relatively high electrical resistance that poses an obstacle to improving switching spe... | 09/11/2007 |
| 7230035 | Catalysts for the conversion of methane to synthesis gas The present invention relates to improved catalyst compositions, as well as methods of making and using such compositions to prepare synthesis gas and ultimately C5+ hydrocarbons. In particular, preferred embodiments of the present invention comprise cata... | 06/12/2007 |
| 7147757 | Method for separating an azepine derivative out of a mixture containing an amine an azepine derivative The invention relates to a method for separating by distillation a portion or the entirety of an azeptine derivative (III), which is selected from the group consisting of aminohexylidene imine, tetrahydroazepine, hexylhexahydroazepine and of aminohexylhexahydroazepi... | 12/12/2006 |
| 7132562 | Use of modifiers in a dinitrile hydrogenation process Catalytic process for hydrogenating a dinitrile to produce both aminocapronitrile and hexamethylenediamine in which the dinitrile is contacted with hydrogen in the presence of a catalyst and a modifier selected from the group consisting of quaternary ammonium hydrox... | 11/07/2006 |
| 7091153 | Hydrogenation catalyst A material useful as catalyst for the hydrogenation of alpha, omega-dinitriles comprises (a) iron or a compound based on iron or mixtures thereof, (b) from 0.001 to 0.3% by weight based on (a) of a promoter based o... | 08/15/2006 |
| 7091284 | Hydrogenated nitrile rubbers with improved low-temperature properties Hydrogenated copolymers of an unsaturated nitrile, butadiene and isoprene, wherein the molar ratio of butadiene to isoprene is less than 3:1, display valuable low temperature properties. ... | 08/15/2006 |
| 6972075 | Method for removing 6-aminocapronitrile from mixtures that contain 6-aminocapronitrile, adipodinitrile and hexamethylenediamine The invention relates to a method for removing, by distillation, 6-aminocapronitrile from mixtures that contain 6-aminocapronitrile, adipodinitrile and hexamethylenediamine, by a) removing the hexamethylenediamine from the mixture while obtaining a mixture (I) that ... | 12/06/2005 |
| 6887352 | Distillative method for separating hexamethylenediamine from a mixture comprising hexamethylenediamine, 6-aminocapronitrile and tetrahydroazepine A method for recovering hexamethylene diamine (HMD) from a mixture comprising HMD, 6-aminocapronitrile (ACN) tetrahydroazepine (THA), and adiponitrile (ADN) is disclosed. The method includes introducing the mixture into a first distillation column, separating... | 05/03/2005 |
| 6737540 | Aminonitrile production Provided is a selective hydrogenation process for producing aminonitriles by contacting the corresponding dinitriles with a hydrogen-containing fluid in the presence of a hydrogenation catalyst, a solvent and a fluoride additive. ... | 05/18/2004 |
| 6720444 | Aminonitrile production Provided is a selective hydrogenation process for producing aminonitriles by contacting the corresponding dinitriles with a hydrogen-containing fluid in the presence of a hydrogenation catalyst, a solvent and tetraalkylammonium hydroxide and/or tetraalkylphosphonium... | 04/13/2004 |
| 6710201 | Aminonitrile production Provided is a selective hydrogenation process for producing aminonitriles by contacting the corresponding dinitriles with a hydrogen-containing fluid in the presence of a hydrogenation catalyst, a solvent and an amide additive. ... | 03/23/2004 |
| 6680403 | Process for hydrogenating dinitriles in aminonitriles Provided is a selective hydrogenation process for producing aminonitriles by contacting the corresponding dinitriles with a hydrogen-containing fluid in the presence of a hydrogenation catalyst, a solvent and an additive for improving the yield of and/or ... | 01/20/2004 |
| 6635781 | Method for hemihydrogenating dinitriles to form aminonitriles A process is provided for the hemihydrogenation of dinitriles to corresponding aminonitriles using hydrogen in the presence of a supported catalyst. The supported catalyst comprises ruthenium supported on a carbon black, called acetylene black, resulting ... | 10/21/2003 |
| 6559333 | Method for purifying aliphatic aminonitriles The present invention relates to a process for the purification of aliphatic aminonitriles and more particularly of 6-aminocapronitrile. It consists more specifically in subjecting 6-aminocapronitrile to a hydrogenation with molecular hydrogen in the presence ... | 05/06/2003 |
| 6521779 | Hemihydrogenation method for dinitriles The invention concerns the hydrogenation in amine function of a nitrile function of a dinitrile to obtain the corresponding aminonitrile. More precisely, the invention concerns the hemihydrogenation of a dinitrile into the corresponding aminonitrile, in a... | 02/18/2003 |
| 6518449 | Method for regenerating a hydrogenation catalyst, method for hydrogenating compounds comprising nitrile functions The invention concerns a method for regenerating a hydrogenation catalyst, and hydrogenation methods carried out with a catalyst comprising at least one regenerated catalyst. More particularly, it concerns a method for regenerating Raney catalysts used in... | 02/11/2003 |
| 6506927 | Aminonitrile production Provided is a selective hydrogenation process for producing aminonitriles by contacting the corresponding dinitriles with a hydrogen-containing fluid in the presence of a hydrogenation catalyst, a solvent and a quaternary ammonium cyanate additive.... | 01/14/2003 |
| 6478968 | Method for filtering a three-phased reaction mixture A method for filtering a three phase reaction mixture comprising a liquid phase, an undissolved solid catalytic phase and a gas phase includes tangentially filtering through a membrane filter at least part of the three phased reaction mixture, and recycli... | 11/12/2002 |
| 6462220 | Method for simultaneous preparation of 6-aminocapronitrile and hexamethylene diamine A process for the coproduction of 6-aminocapronitrile and hexamethylenediamine starting from adiponitrile by a) hydrogenating adiponitrile in the presence of a catalyst comprising an element of the eighth transition group as catalytically active component, ... | 10/08/2002 |
| 6455724 | Aminonitrile production Provided is a selective hydrogenation process for producing aminonitriles by contacting the corresponding dinitriles with a hydrogen-containing fluid in the presence of a hydrogenation catalyst, a solvent and an azide additive.... | 09/24/2002 |
| 6455723 | Aminonitrile production Provided is a selective hydrogenation process for producing aminonitriles by contacting the corresponding dinitriles with a hydrogen-containing fluid in the presence of a hydrogenation catalyst, a solvent and divalent sulfur and selenium compounds.... | 09/24/2002 |
| 6346641 | Method for simultaneous production of 6-aminocapronitrile and hexamethylenediamine A process for the coproduction of 6-aminocapronitrile and hexamethylenediamine starting from adiponitrile by a) hydrogenating adiponitrile in the presence of a catalyst comprising an element of the eighth transition group as catalytically active component, ... | 02/12/2002 |
| 6297394 | Iron-based catalyst for hydrogenating alpha-, omega-dinitriles A material useful as catalyst for the hydrogenation of alpha, Omega-dinitriles comprises a) iron or a compound based on iron or mixtures thereof, (b) from 0.001 to 0.3% by weight based on (a) of a promoter based on 2, 3, 4 or 5 elements selected from the group... | 10/02/2001 |
| 6265602 | Method for hydrogenating aliphatic alpha-, omega-dinitriles A process for hydrogenation of aliphatic alpha, omega-dinitriles in the presence of a heterogeneous fixed bed catalyst comprises using a reaction mixture comprising from 2 μmol to 30 mmol NA, K, Rb, Cs, Mg, Ca, Sr, Ba or Mn or mixtures thereof in the for... | 07/24/2001 |
| 6258745 | Aminonitrile production Provided is a selective hydrogenation process for producing aminonitriles by contacting the corresponding dinitriles with a hydrogen-containing fluid in the presence of a hydrogenation catalyst, a solvent and a cyanide compound.... | 07/10/2001 |
| 6255521 | Method for producing aliphatic alpha, omega-amino nitriles The invention relates to a method for producing aliphatic alpha-omega amino nitriles in the presence of a catalyst composed of (a) iron or an iron based compound or a mixture thereof (b) 0.01 to 5 wt. %, in relation to (a), a promoter based on 2, 3, 4, or... | 07/03/2001 |
| 6232488 | Method for hydrogenating dinitriles The present invention relates to a process for the hydrogenation of aliphatic dinitriles at least partly into corresponding aminonitriles. More specifically, the invention consists of a continuous process for the hydrogenation of dinitrile, at least partl... | 05/15/2001 |
| 6222059 | Process for the manufacture of aliphatic alpha, omega amino nitriles A process for preparing aliphatic alpha,omega-amino nitrites by partial hydrogenation of aliphatic alpha,omega-dinitriles in the presence of a catalyst, wherein the catalyst used for the partial hydrogenation comprises (a) iron or a compound based on iron... | 04/24/2001 |
| 6207851 | Process for simultaneously preparing 6-aminocapronitrile and hexamethylene diamine A process for coproduction of 6-aminocapronitrile and hexamethylenediamine starting from adiponitrile comprises (1) partially hydrogenating adiponitrile in the presence of a catalyst to obtain a mixture comprising 6-aminocapronitrile, hexamethylenediamine and ... | 03/27/2001 |
| 6156694 | Raney cobalt catalyst and a process for hydrogenating organic compounds using said catalyst The present invention relates to a Raney catalyst comprising iron, cobalt, a third metal wherein the third metal is selected from the group consisting of nickel, rhodium, ruthenium, palladium, platinum, osmium, iridium and mixtures of any of the metals of... | 12/05/2000 |
| 6147247 | Process for simultaneously preparing 6-aminocapronitrile and hexamethylene diamine A process for coproduction of 6-aminocapronitrile and hexamethylenediamine starting from a mixture comprising a phosphorus-containing compound and essentially adiponitrile and obtained by reaction of butadiene with hydrocyanic acid in the presence of a ca... | 11/14/2000 |
| 6114567 | Preparation of aliphatic alpha, omega-aminonitriles Aliphatic alpha,omega-aminonitriles are prepared by partial hydrogenation of aliphatic alpha,omega-dinitriles at elevated temperatures and superatmospheric pressure in the presence of a solvent and of a catalyst by a process which comprises using a cataly... | 09/05/2000 |
| 6110856 | Catalysts suitable for preparing aliphatic alpha-, omega-aminonitriles by partial hydrogenation of aliphatic dinitriles A catalyst suitable for preparing aliphatic alpha, omega-aminonitriles by partial hydrogenation of aliphatic dinitriles comprises (a) metallic cobalt, a cobalt compound or a mixture thereof, the proportion of metallic cobalt based on (a) being from 20 to 100% ... | 08/29/2000 |
| 6087296 | Raney iron catalyst and a process for hydrogenating organic compounds using said catalyst The present invention relates to a Raney catalyst comprising iron, cobalt, a third metal wherein the third metal is selected from the group consisting of nickel, rhodium, ruthenium, palladium, platinum, osmium, iridium and mixtures of any of these metals.... | 07/11/2000 |
| 6080883 | Method of simultaneously producing 6-aminocapronitrile and hexamethylenediamine A process for the coproduction of 6-aminocapronitrile (ACN) and hexamethylenediamine (HMD) by treatment of adiponitrile (ADN) with hydrogen in the presence of a nickel-containing catalyst at temperatures not below room temperature and elevated hydrogen pa... | 06/27/2000 |
| 6080884 | Aminonitrile production A process for selectively hydrogenating a dinitrile to an aminonitrile is provided. The process comprises contacting a dinitrile with a hydrogen-containing fluid in the presence of a solvent and a metal catalyst in which the solvent comprises liquid ammon... | 06/27/2000 |
| 5986127 | Aminonitrile production A process for selectively hydrogenating a dinitrile to an aminonitrile is provided. The process comprises contacting a dinitrile with a hydrogen-containing fluid in the presence of a solvent comprising an alcohol or liquid ammonia, at least one metal cata... | 11/16/1999 |
