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| Number | Title | Issue Date |
| 7601323 | Method for producing hydrogen peroxide The present invention provides a method for producing hydrogen peroxide, comprising the steps of: alternately reducing and oxidizing a working solution containing anthraquinone compounds as a reaction medium, wherein a mixture of alkyl-substituted anthraquinones and... | 10/13/2009 |
| 7425316 | Chemical process and composition The invention relates to a process for production of hydrogen peroxide according to the anthraquinone process including altemate hydrogenation and oxidation of one or more quinones selected from anthraquinones and/or tetrahydro anthraquinones in a working solution c... | 09/16/2008 |
| 7416718 | Auto-oxidation production of hydrogen peroxide via oxidation in a microreactor Hydrogen peroxide is prepared by an auto-oxidation method via oxidation in a microreactor. A working solution containing a reactive carrier compound is hydrogenated with hydrogen in a first step and is subsequently oxidized in a microreactor to produce hydrogen pero... | 08/26/2008 |
| 7238335 | Process for the preparation of hydrogen peroxide by the anthraquinone cyclic process The invention concerns a process for the preparation of hydrogen peroxide by the anthraquinone cyclic process. The process includes a regeneration stage in which working solution is regenerated by being brought into contact with an aqueous solution containing an alk... | 07/03/2007 |
| 7195748 | Process for the production of hydrogen peroxide The invention relates to a process for the production of hydrogen peroxide by the anthraquinone process, comprising a hydrogenation stage, an oxidation stage and an extraction stage. According to the invention, catalytic hydrogenation of anthraquinone derivatives di... | 03/27/2007 |
| 7156332 | Product containment apparatus Self contained filter backpurge systems useful for totally enclosed processing mills and for clean in place (CIP) processing material processing mills. ... | 01/02/2007 |
| 7056485 | Continuous hydrogenation process The invention is directed to a continuous hydrogenation process in which a hydrogenable compound is dissolved in a working solution with hydrogen and a heterogeneous catalyst. At least part of the hydrogen-containing waste hydrogenation gas generated in the reaction... | 06/06/2006 |
| 7001584 | Chemical process and composition The invention relates to a process for production of hydrogen peroxide according to the anthraquinone process including alternate hydrogenation and oxidation of one or more quinones selected from anthraquinones and/or tetrahydro anthraquinones in a working solution ... | 02/21/2006 |
| 6861042 | Continuous hydrogenation process A continuous catalytic hydrogenation process, in which a reaction mixture containing the substance to be hydrogenated, the hydrogenation product, hydrogen and the hydrogenation catalyst suspended in the reaction mixture is recirculated in a reactor. Part of the hydr... | 03/01/2005 |
| 6524547 | Process for producing hydrogen peroxide and composition therefor The invention concerns a process for production of hydrogen peroxide according to the anthraquinone process comprising the steps of alternate hydrogenation and oxidation of anthraquinones and tetrahydro anthraquinones in a working solution comprising a mi... | 02/25/2003 |
| 6464954 | Method for hydrogenating an anthraquinone compound A process for hydrogenating an anthraquinone compound or a mixture of two or more thereof utilizes specific catalysts comprising, as active metal, a metal of transition group VIII of the Periodic Table of the Elements.... | 10/15/2002 |
| 6342196 | Synthesis of hydrogen peroxide A method for synthesizing hydrogen peroxide comprises the steps of: synthesizing an analog of anthraquinone that is miscible or soluble in carbon dioxide; reacting the analog of anthraquinone with hydrogen in carbon dioxide to produce a corresponding anal... | 01/29/2002 |
| 6333018 | Process for the industrial production of high purity hydrogen peroxide Process for the industrial production of hyperpure hydrogen peroxide also having high titre up to 60-70% by weight characterized in that the hydrogen peroxide produced in an industrial plant is directly fed to a purification unit, being part of the same p... | 12/25/2001 |
| 6153169 | Method of producing hydrogen peroxide and reaction promoters therefor A cyclic anthraquinone process for producing hydrogen peroxide using at least two differently substituted 2-alkylanthraquinones and/or their tetrahydro derivatives. The working solution to be used contains (i) at least one reaction carrier from the series... | 11/28/2000 |
| 5853693 | Hydrogenation catalyst for production of hydrogen peroxide, and method for preparation of same A method for preparing hydrogen peroxide in accordance with an anthraquinone method, comprising hydrogenating at least one anthraquinone with a hydrogenation catalyst comprising palladium and at least one alkali metal, supported on a silica carrier, where... | 12/29/1998 |
| 5827493 | Process for producing hydrogen peroxide A method using auto-oxidation of an anthraquinone derivative in three successive steps, comprising hydrogenating the working solution (at 1), oxidizing the hydrogenated working solution (at 2), and removing hydrogen peroxide using water (at 3). The hydrog... | 10/27/1998 |
| 5674797 | Method for regenerating a hydrogenation catalyst The invention relates to a method for regenerating a hydrogenation catalyst employed in the production of hydrogen peroxide, being characterized in that the catalyst to be regenerated is treated with an oxidized working solution used in the production of ... | 10/07/1997 |
| 5540906 | Hydrogen peroxide process Hydrogen peroxide is produced by oxidizing alkylammonium salts of sulfonic acid-substituted anthrahydroquinones. As said salts are highly soluble in protic polar solvents such as water and lower aliphatic alcohols, the concentration of hydrogen peroxide i... | 07/30/1996 |
| 5399333 | Process for producing hydrogen peroxide A process for producing hydrogen peroxide by subjecting a working solution containing anthraquinones as the reaction medium, to reduction and oxidation alternately, which process is characterized in that (1) the anthraquinones as the reaction medium conta... | 03/21/1995 |
| 5302367 | Process for obtaining aqueous hydrogen peroxide solutions Process for obtaining aqueous hydrogen peroxide solutions by the alkylanthraquinone process, providing a concentrated aqueous hydrogen peroxide solution with a low content of impurities, according to which a continuous addition of acidifying compounds and... | 04/12/1994 |
| 4668436 | Process for purifying a working solution A process is provided to regenerate and purify a working solution for the manufacture of hydrogen peroxide by the reduction and oxidation of a solution of alkylated anthraquinones and derivatives. The regeneration and purification is effected by removing ... | 05/26/1987 |
| 4544543 | Purification of alkylated anthraquinones The invention is for a process for removing unalkylated anthraquinones from alkylated anthraquinone by forming a solution thereof, reducing the solution sufficiently so that at least part of the unalkylated anthraquinone is in the reduced form, and extrac... | 10/01/1985 |
| 4374820 | Manufacture of H2 O2 An alkylanthraquinone working solution as used in the manufacture of hydrogen peroxide, in the oxidized form is cooled to from 20° to 40° C. and fed to a slurry type catalytic hydrogenator maintained at from 38° to 60° C., and 10 to 100 psig. From 10 ... | 02/22/1983 |
