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| Number | Title | Issue Date |
| 8153825 | Preparation of phthalic anhydride by gas phase oxidation of o-xylene A process is described for preparing phthalic anhydride by catalytic gas phase oxidation of o-xylene, in, in a main reactor, a gaseous mixture of o-xylene and an oxygenous gas is passed through at least two reaction zones whose temperature can be controlled independ... | 04/10/2012 |
| 8106220 | Preparation of phthalic anhydride by gas phase oxidation of O-xylene in a main reactor and postreactor A process is described for preparing phthalic anhydride by catalytic gas phase oxidation of o-xylene, in which a gaseous mixture of o-xylene and an oxygenous gas is converted in a main reactor to a gaseous intermediate reaction product which comprises unconverted o-... | 01/31/2012 |
| 8067618 | Method for gas phase oxidation using a moderator layer A process for gas phase oxidation in which a gaseous stream which comprises at least one aromatic hydrocarbon and molecular oxygen is passed through one or more catalyst layers, wherein a moderator layer is arranged between two catalyst layers arranged in succession... | 11/29/2011 |
| 7772410 | Method for producing phthalic anhydride Processes comprising: (a) providing a reactant comprising a component selected from the group consisting of o-xylene, naphthalene and mixtures thereof, and a gas comprising oxygen; (b) reacting the reactant and the gas in a reaction system, in the presence of a cata... | 08/10/2010 |
| 7371361 | Maximum reaction rate converter system for exothermic reactions An ammonia converter system and method are disclosed. The reactor can alter the conversion of ammonia by controlling the reaction temperature of the exothermic reaction along the length of the reactor to parallel the equilibrium curve for the desired product. The re... | 05/13/2008 |
| 7371893 | Production of aldehydes, carboxylic acids and/or carboxylic acid anhydrides by means of catalysts containing vanadium oxide, titanium dioxide, and antimony oxide A description is given of a process for preparing aldehydes, carboxylic acids and/or carboxylic anhydrides, in particular phthalic anhydride, in which a gaseous stream comprising an aromatic hydrocarbon and molecular oxygen is passed at elevated temperature over a b... | 05/13/2008 |
| 7326810 | Method for starting up reactor In the reaction of catalytic gas phase oxidation induced by the supply of at least a raw material to be oxidized and a molecular oxygen-containing gas to a reactor for catalytic gas phase oxidation, a method for starting up the reactor for catalytic gas phase oxidat... | 02/05/2008 |
| 7273593 | Reactor having a heat exchange medium circulation A reactor including a bundle of catalyst tubes through which a reaction mixture is passed, and wherein a heat exchange medium is passed through a space surrounding the catalyst tubes and including ring lines at both reactor ends with jacket orifices for feeding in a... | 09/25/2007 |
| 7256155 | Flue gas denitration catalyst and preparation process thereof Provided are a flue gas denitration catalyst having high denitration activity and capable of suppressing a side reaction, that is, oxidation of SO2; and a preparation process of the catalyst. The flue gas denitration catalyst comprises TiO2, WO... | 08/14/2007 |
| 7253308 | Method for catalytic phase oxidation to (meth) acrolein and/or (meth) acrylic acid A process for the continuous gas-phase oxidation of C3- and C4-precursors to (meth)acrolein and/or (meth)acrylic acid in the presence of a catalyst in a reactor which has a feed for the reaction mixture at one reactor end and removal of the rea... | 08/07/2007 |
| 7201215 | Vapor-lift pump heat transport apparatus A vapor-lift pump heat transport apparatus having a small heat resistance and a large heat transport capacity. A heat exchange circulating solution container has a first space and a second space communicating with the first space through a communication opening and ... | 04/10/2007 |
| 7196217 | Operation of a continuous heterogeneously catalyzed gas phase partial oxidation of at least one organic compound Process for operating a continuous heterogeneously catalyzed gas phase partial oxidation of at least one organic compound using compressed air as the oxygen source which is filtered before its compression. ... | 03/27/2007 |
| 7087544 | Nano-ceramics and method thereof Disclosed herein is a method to produce ceramic materials utilizing the sol-gel process. The methods enable the preparation of intimate homogeneous dispersions of materials while offering the ability to control the size of one component within another. The method al... | 08/08/2006 |
| 7067455 | Copper modified catalysts for oxidative dehydrogenation Catalysts and methods useful for the production of olefins from alkanes via oxidative dehydrogenation (ODH) comprise at least one base metal and copper with an optional promoter. The catalyst preferably comprises a base metal and a copper-modified Groups 8, 9, or 10... | 06/27/2006 |
| 7013673 | Hydrate-based desalination/purification using permeable support member Processes and apparatus are disclosed for separating and purifying aqueous solutions such as seawater by causing a substantially impermeable mat of gas hydrate to form on a porous restraint. Once the mat of gas hydrate has formed on the porous restraint, the portion... | 03/21/2006 |
| 6998504 | Method for the catalytic gas phase oxidation of propene into acrylic acid A process for the catalytic gas-phase oxidation of propene to acrylic acid, in which the reaction gas starting mixture is oxidized, with a high propene loading, in a first reaction stage, over a first fixed-bed catalyst which is housed in two successive reaction zon... | 02/14/2006 |
| 6984289 | Process of generating o-xylene-air mixtures for the production of phthalic anhydride Process for generating a homogeneous gas mixture of o-xylene and air for the production of phthalic anhydride wherein o-xylene is completely evaporated in the absence of oxygen, superheated and then mixed with air and supplied to a phthalic anhydride reactor. ... | 01/10/2006 |
| 6919478 | Reaction tube, process for producing catalyst and process for producing unsaturated aldehyde and unsaturated carboxylic acid In producing a catalyst used for synthesis of an unsaturated aldehyde and an unsaturated carboxylic acid by a gas-phase catalytic oxidation, there is used a step of packing an additive-containing catalyst precursor of the catalyst into a tubular reactor, passing a g... | 07/19/2005 |
| 6881815 | Method for the preparation poly(etherimide)s A method for the synthesis of poly(etherimide)s comprises the reaction of 4-halotetrahydrophthalic anhydride with an activating primary amine to yield an activated 4-halotetrahydrophthalimide. Activated 4-halotetrahydrophthalimide may then be aromatized and treated ... | 04/19/2005 |
| 6849574 | Silver- and vanadium-containing multimetal oxide and its use A multimetal oxide of the formula I Aga−bMbV2Ox*c H2O, I where M is a metal selected from the group consisting of Li, Na, K, Rb, Cs, Tl, Mg, Ca, Sr, Ba, Cu, Zn, Cd, Pb, Cr, Au, Al, Fe... | 02/01/2005 |
| 6774246 | Method for producing phthalic anhydride A process for preparing phthalic anhydride by gas-phase oxidation of xylene, naphthalene or mixtures thereof over two different fixed-bed catalysts arranged in zones in a shell-and-tube reactor which is thermostated by means of a heat transfer medium is carried out ... | 08/10/2004 |
| 6768013 | Intrinsically safe oxidation process A novel process for the direct oxidation of hydrogen and hydrocarbons is disclosed, where the explosion risks inherent in gas phase oxidations are substantially eliminated. Gaseous oxidation reactants are soluble in a first reaction solvent phase such as a perfluoro... | 07/27/2004 |
| 6747162 | Counterflow reactor with a bundle of contact tubes In a reactor (1) which has a bundle of catalyst tubes (2) and in which a heat transfer medium is circulated through the space surrounding the catalyst tubes, with the ring lines (3, 4) at both ends of the reactor with openings (5, 6) thro... | 06/08/2004 |
| 6730631 | Methods of producing monolithic oxidation catalysts and their use in gas phase oxidation of carbohydrates A method is for producing monolithic substrate catalysts and for their use in the gas phase oxidation of hydrocarbons. The catalysts are obtained by coating the catalyst substrate with a suspension that includes a catalytically active compound and one or more surfac... | 05/04/2004 |
| 6730808 | Oxidative reactions using membranes that selectively conduct oxygen Reactor membranes for used in oxidation reactions of hydrocarbons involving oxygen comprising a selective oxidation catalyst on a mixed conducting, oxide ion selective ceramic membrane of the composition (Sr1-xCax)1-yAyMn | 05/04/2004 |
| 6719925 | Naphthopyrans with a heterocycle in the 5, 6-position, preparation, and (co)polymer compositions and matrices containing them The present invention relates to novel compounds of the naphthopyran type with a fused heterocycle in the 5,6-position. These compounds have formula (I) or (II) given below: These compounds (I) or (II) have valuable phot... | 04/13/2004 |
| 6700000 | Method for producing phthalic anhydride Phthalic anhydride is prepared by catalytic gas-phase oxidation of xylene and/or naphthalene by a gas comprising molecular oxygen in a fixed bed at elevated temperature and using at least three coated catalysts arranged in superposed zones, which catalyst... | 03/02/2004 |
| 6670487 | Method for removing impurities from oxidation products Disclosed is a method for removing impurities from products derived from oxidation of an ortho-dialkylaromatic compound which comprises at least one step selected from the group consisting of extraction of an aqueous solution comprising aromatic dicarboxy... | 12/30/2003 |
| 6653321 | Naphthylsulfonic acids and related compounds as glucose uptake agonists Methods for treating conditions associated with hyperglycemia, especially Type II diabetes, with novel naphthylsulfonic acids and related compounds. These compounds, as single stereoisomers or mixtures of stereoisomers, or their pharmaceutically acceptabl... | 11/25/2003 |
| 6579991 | Method and device for cooling a hot reactor gas, for example in the production of phthalic anhydride A process for cooling a hot reaction gas, as formed, in the preparation of phthalic anhydride by oxidation of o-xylene with hot air in a reactor (213), to a predetermined inlet temperature for introduction into a separator (221), in which the separation i... | 06/17/2003 |
| 6576770 | Preparation of substituted phthalic anhydrides and substituted phthalimides A process for the formation of halophthalic anhydrides and halogen substituted-n-alkyl-phthalimides from the corresponding substituted-n-alkyl-tetrahydrophthalimide by passing said substituted-n-alkyl-tetrahydrophthalimide over a metal catalyst, in the ... | 06/10/2003 |
| 6469183 | Method of producing phthalic acid anhydride In a process for preparing phthalic anhydride by passing a gas stream comprising o-xylene, oxygen and sulfur dioxide at elevated temperature over a catalyst comprising heavy metals, the content of N-acyl compounds in the gas stream is restricted to less t... | 10/22/2002 |
| 6417376 | Selective oxidation process and catalyst therefor A process for selectively oxidizing an organic molecule by reacting said organic molecule and oxygen in the presence of a selective oxidation catalyst supported on a mesh-like structure.... | 07/09/2002 |
| 6369240 | Gas-phase oxidization process and process for the preparation of phthalic anhydride This invention relates to the vapor-phase oxidation of hydrocarbons by passing a gaseous mixture comprising of a molecular oxygen-containing gas and hydrocarbons which may contain substituents to a fixed bed of catalyst and provides a process for vapor-ph... | 04/09/2002 |
| 6362345 | Method for producing phthalic anhydride by means of catalytic vapor-phase oxidation of o-xylol/naphthalene mixtures In a process for preparing phthalic anhydride by catalytic gas-phase oxidation of o-xylene/naphthalene mixtures by molecular oxygen, use is made of a catalyst I in a first zone on the gas inlet side which makes up from 25 to 75 percent by volume of the to... | 03/26/2002 |
| 6344568 | Catalyst for gas phase partial oxidation This invention relates to a method for producing a partially oxidized organic compound, e.g., an unsaturated aldehyde/carboxylic acid having three or more carbon atoms, or an organic acid anhydride/nitrile compound having four or more carbon atoms. This m... | 02/05/2002 |
| 6133184 | Catalyst for catalytic oxidation use A carrier containing silicon carbide, inorganic bonding component, and at least one oxide selected from the group consisting of a niobium oxide, an antimony oxide, and a tungsten oxide carries at least one oxide selected from the group consisting of a van... | 10/17/2000 |
| 6020533 | Hydrocarbon conversion processes using crystalline manganese phosphate compositions Hydrocarbon conversion processes using a new family of crystalline manganese phosphate compositions is disclosed. These compositions have an extended network; which network can be a one-, two-, or three-dimensional network. The composition has an empirica... | 02/01/2000 |
| 5986110 | Process for the selective oxidation of hydrocarbons The invention relates to a heterogeneous vanadium-phosphorus oxide catalyst system for the selective oxidation of hydrocarbons, which may or may not be saturated, comprising a support based on one or more metal oxides, and vanadium-phosphorus oxide in an ... | 11/16/1999 |
| 5969160 | Process for producing phthalic anhydride Process for producing phthalic anhydride by catalytic gaseous phase oxidation of o-xylene or naphthalene in the presence of catalyst, whereby the reaction is carried out in at least two separate reactors. The first reactor is a salt-cooled main reactor an... | 10/19/1999 |
