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| Number | Title | Issue Date |
| 8153092 | Method for manufacturing hydroxylamine Provided is a method for manufacturing hydroxylamine. In this method, an aqueous reaction medium containing acidic buffer agent and nitrate ions in the presence of a limited amount of metal impurities such as Fe is introduced into a hydroxylamine synthesis reactor i... | 04/10/2012 |
| 7981393 | Method of producing salts of dinitramidic acid A method of preparing salt of dinitramidic acid, comprising nitration of an initial compound with a nitrating acid mixture to form dinitramidic acid in a reaction mixture. A positive ion is added to the reaction mixture and forms with the dinitramide ion an ion pair... | 07/19/2011 |
| 7892512 | Method for manufacturing hydroxylamine Provided is a method for manufacturing hydroxylamine. In this method, an aqueous reaction medium containing acidic buffer agent and nitrate ions in the presence of a limited amount of metal impurities such as Fe or Cu is introduced into a hydroxylamine synthesis rea... | 02/22/2011 |
| 7608236 | Method for producing hydroxylammonium salts A method of producing hydroxylammonium salts by catalytic reaction of nitrogen monoxide with hydrogen in a diluted aqueous solution of mineral acid in the presence of platinum catalysts suspended on a support in multiple subsequent reaction stages. This reaction tak... | 10/27/2009 |
| 7425247 | Method for producing an aqueous solution hydroxylamine This invention relates to a method for producing an aqueous solution of free hydroxylamine (HA) by simultaneous countercurrent treatment of a HA salt with ammonia or ammonia water, then separating the HA by distillation and reconcentrating the aqueous HA solution in... | 09/16/2008 |
| 7396519 | Preparation of a high purity and high concentration hydroxylamine free base A high purity aqueous solution of hydroxylamine product is prepared by treating an aqueous solution of hydroxylammonium salt with a base like ammonia at low temperatures. A novel process can be carried out by separating the ammonium salt side product from hydroxylam... | 07/08/2008 |
| 7378194 | Materials useful as electrolytic solutes The invention concerns novel ionic compounds with low melting point whereof the onium type cation having at least a heteroatom such as N, O, S or P bearing the positive charge and whereof the anion includes, wholly or partially, at least an ion imidide such as (FX | 05/27/2008 |
| 7329354 | Purification of organic solvent fluids A chemical distribution system having improved organic solvent fluid purity and consistency includes a vessel containing ion-exchange media positioned within a fluid flow pathway such that the organic solvent fluid passes through the ion-exchange media, thereby effe... | 02/12/2008 |
| 7172744 | Process for manufacturing highly concentrated hydroxylamine An improved ion exchange process for manufacturing and concentrating hydroxylamine from an aqueous solution comprising hydroxylammonium ion and counter anions is disclosed. The process involves the use of an aqueous hydroxylamine wash step which assists in controlli... | 02/06/2007 |
| 7105078 | Method for producing an aqueous hydroxylamine solution devoid of salt A process for preparing a salt-free aqueous hydroxylamine solution by reacting an aqueous solution of a hydroxylammonium salt with a base to give a mixture and separating from said mixture by distillation a salt-free aqueous hydroxylamine solution, involving using a... | 09/12/2006 |
| 7090817 | Process for the preparation of hydroxylammonium The invention relates to a process for the preparation of hydroxylammonium, said process comprising the steps of: a) feeding gaseous hydrogen to a reaction mixture, said reaction mixture comprising an aqueous reaction medium and a gaseous phase; ... | 08/15/2006 |
| 7037478 | Method for continuous producing hydroxylammonium salts A process for the continuous preparation of hydroxylammonium salts by catalytic reduction of nitrogen monoxide by means of hydrogen in a dilute aqueous solution of mineral acid in a plurality of reaction stages connected in series comprises ... | 05/02/2006 |
| 7029557 | Method for producing an aqueous hydroxylamine solution devoid of salt The invention relates to a method for producing a highly pure, aqueous hydroxylamine solution by distilling an aqueous solution, devoid of salt, of a hydroxyl ammonium salt in a plate column comprising at least two mechanical plates. Said method is characterised in ... | 04/18/2006 |
| 7022844 | Amide-based compounds, production, recovery, purification and uses thereof Methods are disclosed of producing and purifying at least one amide. In accordance with one of the methods disclosed herein, the at least one amide is produced by providing an organic liquid comprising at least one oxime, providing at least one catalyst, adding the ... | 04/04/2006 |
| 6998056 | Process and device for aerating a liquid with gas Apparatus and process for aerating a liquid with gas, the apparatus comprising a pressure vessel including a lower section containing the liquid and an upper section containing a volume of the gas. A pressure connection in the upper section of the pressure vessel ad... | 02/14/2006 |
| 6942762 | Method for the production of a salt-free aqueous hydroxylamine solution A process for preparing a salt-free aqueous hydroxylamine solution by distilling an aqueous solution of a hydroxylammonium salt and a base in a tray column having at least two mechanical trays, wherein random or structured packings are located above at least one tra... | 09/13/2005 |
| 6787119 | Process for the preparation of dinitramidic acid and salts thereof The present invention provides an ecofriendly method for preparing dinitramidic acid and its salts by nitration of ammonium sulfamate with fuming nitric acid as a nitrating agent using solid acid catalysts selected from the group consisting of a montmorillonite clay... | 09/07/2004 |
| 6758946 | Recycling hydroxylamine-containing stripper solutions A process for working up hydroxylamine-containing solutions as obtained in particular in the electronics industry during the cleaning of electronic components is described. According to the invention, the hydroxylamine is stripped from the wastewater with steam. The... | 07/06/2004 |
| 6699452 | Process for the separation of a hydroxylammonium salt solution Process for the separation of a hydroxylammonium salt solution from an aqueous reaction mixture comprising solid catalyst particles by means of filtration, wherein cake filtration through an asymmetric filter is applied, the asymmetric filter comprising a... | 03/02/2004 |
| 6531108 | Process for producing free hydroxylamine aqueous solution This invention provides a highly pure and highly concentrated free hydroxylamine aqueous solution substantially not containing any salt or organic substance. This invention is a process for obtaining a free hydroxylamine aqueous solution, comprising the s... | 03/11/2003 |
| 6524545 | Method for producing aqueous hydroxylamine solutions which are substantially free of metal ions The present invention relates to a process for the preparation of an aqueous hydroxylamine solution which is essentially free of metal ions, wherein the hydroxylamine solution is subjected to at least one treatment with an acidic cation exchanger.... | 02/25/2003 |
| 6485700 | Process for producing free hydroxylamine aqueous solution This invention provides a process for producing a free hydroxylamine aqueous solution, by letting an alkali react with separated sulfates, for conversion into ammonia and sulfates not containing any nitrogen atom, recovering the valuable ammonia and recyc... | 11/26/2002 |
| 6482383 | Method for preparing hydrazine hydrate A method for preparing hydrazine hydrate comprising: (a) reacting ammonia, hydrogen peroxide and methyl ethyl ketone in a working solution to form an azine; (b) separating the working solution from a mixture comprising the azine, methyl ethyl ketone oxime... | 11/19/2002 |
| 6365301 | Materials useful as electrolytic solutes The invention concerns novel ionic compounds with low melting point whereof the onium type cation having at least a heteroatom such as N, O, S or P bearing the positive charge and whereof the anion includes, wholly or partially, at least an ion imidide su... | 04/02/2002 |
| 6350614 | System for the ion exchange purification of hydroxylamine The invention provides a system for monitoring and controlling an exothermic reaction in an ion exchange process involving a liquid containing a composition capable of producing an exothermic reaction to control a continuous or a rapid evolution of heat a... | 02/26/2002 |
| 6299734 | Preparation of an aqueous solution of free hydroxylamine An aqueous solution of free hydroxylamine is prepared by treating a hydroxylammonium salt with ammonia by the countercurrent method in a stripping column by a process in which hydroxylamine is liberated and at the same time the solution obtained is separa... | 10/09/2001 |
| 6254735 | Process for separating medium boiling substances from a mixture of low, medium and high boiling substances A process for separating a fraction containing low and middle boilers from a mixture of low, middle and high boilers, which involves treating the mixture in a column with low-boiler vapor in the bottom, so that the middle-boiling component accumulates in ... | 07/03/2001 |
| 6235162 | Ultrapure hydroxylamine compound solutions and process of making same In one embodiment, the present invention relates to a method of treating a solution containing hydroxylamine, involving subjecting the solution containing hydroxylamine to fractional distillation using a packed column thereby providing a first distillate;... | 05/22/2001 |
| 6221328 | Process for preparing hydroxylammonium salts The invention relates to a process for preparing a hydroxylammonium salt through catalytic reduction of nitrate ions in an acid medium in the presence of a palladium and/or platinum catalyst on a carrier in which at least 0.00025 mmol halogen ions are pre... | 04/24/2001 |
| 6083468 | Method of manufacturing a hydrogenation catalyst A hydrogenation catalyst is prepared by reduction of platinum in an oxidation state of not less than two using a reducing agent in an aqueous medium in the presence of a carbon-containing support after partial poisoning, where use is made of a compound of... | 07/04/2000 |
| 6074622 | Catalyst based on titanosilicalites and process for producing N,N-disubstituted hydroxylamine The present invention relates to a catalyst based on titanosilicalites having a content by weight of alkali metal or metals of between 0.05 and 2%. The subject of the invention is more particularly a process for producing N,N-disubstituted hydroxylamine f... | 06/13/2000 |
| 5976483 | Method of preparing dinitramidic acid and salts thereof The invention relates to a method of preparing dinitramidic acid HN(NO2)2 and salts thereof having the formula M+n (- N(NO2)2)n, wherein M is a metal cation or a nitrogen-contain... | 11/02/1999 |
| 5972304 | Process for the production of hexaammine cobalt nitrate A novel process for producing bexaammine cobalt(III) nitrate from a cobalt(II) salt is disclosed. The product is useful in formulating gas generant compositions.... | 10/26/1999 |
| 5906805 | Stabilized hydroxylamine solutions The invention provides stabilized hydroxylamine solutions. In particular, stabilized hydroxylamine solutions and processes for their preparation are provided in which the stabilizing compound is cyclohexanediaminetetraacetic acid, hydrochloride salts of t... | 05/25/1999 |
| 5882619 | Preparation of a hydrogenation catalyst using M(OR)m Xn A carbon-containing catalyst support is prepared by treating the carbon-containing catalyst support with a compound of the formula I M(OR)m Xn I where M is Ti or Zr, X is Cl or Br, and R is C1 ... | 03/16/1999 |
| 5872295 | Purification of hydroxylamine The invention provides a method for purification of hydroxylamine so as to have a substantial reduction of cations and anions. The method involves passing a solution of hydroxylamine through at least one strong acid ion exchange bed which has been pretrea... | 02/16/1999 |
| 5837107 | Process for production of aqueous solutions of free hydroxylamine An aqueous solution of free hydroxylamine is prepared by a process in which the solution obtained by treating a hydroxylammonium salt with a base is separated into an aqueous hydroxylamine solution and a salt fraction by treatment with water or steam at à... | 11/17/1998 |
| 5792439 | Process for the preparation of hydroxylammonium salts The invention relates to a process for the preparation of a hydroxylammonium salt through catalytic reduction of nitrate ions in an acid medium, in the presence of an activated catalyst, which catalyst comprises carrier particles with a plurality of metal... | 08/11/1998 |
| 5788946 | Purification of hydroxylamine The invention provides a method for purification of hydroxylamine so as to have a substantial reduction of cations and anions. The method involves passing a solution of hydroxylamine through at least one strong acid ion exchange bed which has been pretrea... | 08/04/1998 |
| 5783161 | Stabilized hyroxylamine solutions The present invention relates to stabilized hydroxylamine solutions comprising as stabilizer at least one compound of the formula I R1 R2 N--A--NR3 R4 (I) in which A and R1 to R4 are as defined in th... | 07/21/1998 |
