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| Number | Title | Issue Date |
| 7619099 | Reduction of acrylic acid in the production of maleic anhydride An improved process for the production of maleic anhydride by the catalytic oxidation of n-butane. Maleic anhydride is produced by reacting n-butane gas with oxygen gas or an oxygen-containing gas, in the presence of a vanadium phosphorus oxide catalyst. A trialkyl ... | 11/17/2009 |
| 7589217 | Yield improvement in the production of maleic anhydride An improved process for the production of maleic anhydride by the catalytic oxidation of n-butane. Maleic anhydride is produced by reacting n-butane gas with oxygen or an oxygen-containing gas, in the presence of a vanadium phosphorus oxide (VPO) catalyst. An improv... | 09/15/2009 |
| 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 |
| 7308788 | Engine and method for counteracting face plugging of a diesel oxidation catalyst A turbocharged engine (20, 20′, 20″, 20′″) counteracts plugging of a diesel oxidation catalyst (DOC 48) by causing a first portion of exhaust from one or more exhaust manifolds (26, 28) to enter the DOC after having passed through the tu... | 12/18/2007 |
| 7198845 | Shaped trilobal particles An elongate, shaped particle having three protrusions each extending from and attached to a central position aligned along the central longitudinal axis of the particle, the cross-section of the particle occupying the area encompassed by the outer edges of six outer... | 04/03/2007 |
| 7169732 | Catalyst-precursor for the production of maleic acid anhydride and method for the production thereof A process for preparing a vanadium, phosphorus, and oxygen catalyst precursor for preparing maleic anhydride by heterogeneously catalyzed gas-phase oxidation of a hydrocarbon having at least four carbon atoms, which comprises (a) r... | 01/30/2007 |
| 7157403 | Catalyst-precursor for the production of maleic acid anhydride and method for the production thereof A process for preparing a vanadium, phosphorus, and oxygen catalyst precursor for preparing maleic anhydride by heterogeneously catalyzed gas-phase oxidation of a hydrocarbon having at least four carbon atoms, by reacting vanadium pentoxide (I) in the presence of a ... | 01/02/2007 |
| 7144557 | Multitube reactor, vapor phase catalytic oxidation method using the multitube reactor, and start up method applied to the multitube reactor A multitube reactor, wherein tubes having smaller tolerance between a nominal size and actual sizes are used as reaction tubes to stably perform a high yield reaction for a long period, a catalyst is filled into the reaction tubes so that the catalyst layer peak tem... | 12/05/2006 |
| 7138094 | Reactor for catalytic treatment of a particle-containing gas An up-flow reactor for the catalytic treatment of particle containing gas comprising at least one fixed catalytic bed; at least one drain pipe located upstream of the fixed catalytic bed, the drain pipe disposed within the reactor and a dust rectifier located downst... | 11/21/2006 |
| 7087767 | Method for producing maleic anhydride Process for preparing maleic anhydride by heterogeneously catalyzed gas-phase oxidation of hydrocarbons having at least four carbon atoms by means of oxygen-containing gases at from 350 to 500° C. in the presence of a volatile phosphorus compound over a vanadium-, ... | 08/08/2006 |
| 7060649 | Method for the production of a catalyst containing vanadium, phosphorus, and oxygen Disclosed is a method for producing a catalyst containing vanadium, phosphorus, and oxygen, which is used for oxidizing the gas phase of a hydrocarbon having at least four carbon atoms to maleic anhydride. According to the inventive method, a corresponding catalyst ... | 06/13/2006 |
| 6956004 | Vanadium/phosphorus mixed oxide catalyst Active vanadium/phosphorus mixed oxide catalyst for the conversion of non-aromatic hydrocarbons, e.g., n-butane, into maleic anhydride. The catalyst is prepared from the catalyst precursor, that is, prepared by the reaction of a source of vanadium in an organic medi... | 10/18/2005 |
| 6946573 | Method for starting up reactor and reactor system A method for quickly starting up a reactor and a reactor system therefor are provided. A shell-and-tube reactor in the system is adapted to circulate a heat medium having a solid point in the range of 50-250° C. to the outside of the reaction tubes and characterize... | 09/20/2005 |
| 6933417 | Process for vinyl chloride manufacture from ethane and ethylene with partial CHl recovery from reactor effluent A process for producing vinyl chloride monomer from ethylene and ethane having input of significant quantities of both ethane and ethylene in input streams to the affiliated reactor where hydrogen chloride in the reactor effluent is only partially recovered from the... | 08/23/2005 |
| 6921830 | Method for purifying an organic solvent for the purposes of absorption of maleic acid anhydride In a process for purifying an organic solvent for the absorption of maleic anhydride from a gaseous mixture, in which the maleic anhydride is separated off from the solvent, a substream is taken from the solvent stream, this substream is distilled and returned to th... | 07/26/2005 |
| 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 |
| 6909024 | Process for the conversion of ethylene to vinyl chloride and novel catalyst compositions useful for such process This invention is a process for producing vinyl chloride from an ethylene-containing feed, oxygen, and a chlorine source in the presence of a catalyst. The process permits direct production of vinyl chloride in a single reactor system, and further permits ethane to ... | 06/21/2005 |
| 6903047 | Vanadium-phosphorus oxide catalysts with promoter reagents The present invention concerns a method for enhancing the activity of vanadium phosphorus oxide (VPO) catalysts. Promoter reagents are grafted onto or reacted with the catalyst surface. An optional calcination and activation heating cycle transforms the catalyst pre... | 06/07/2005 |
| 6812351 | Hollow cylindrical catalyst and a method for producing a maleic acid anhydride A catalyst used in a process for preparing maleic anhydride by heterogeneously catalyzed gas-phase oxidation of a hydrocarbon having at least four carbon atoms by means of oxygen-containing gases comprises a catalytically active composition comprising vanadium, phos... | 11/02/2004 |
| 6803473 | Method for producing maleic acid anhydride In a process for preparing maleic anhydride by heterogeneously catalyzed gas-phase oxidation of hydrocarbons having at least four carbon atoms using oxygen-containing gases in the presence of a volatile phosphorus compound over a catalyst comprising vanadium, phosph... | 10/12/2004 |
| 6624315 | Method of gas phase catalytic oxidation to give maleic acid anhydride A process for the preparation of maleic anhydride by heterogeneously catalyzed gas-phase oxidation in a reactor with feed for the reaction mixture at one end of the reactor and discharge of the product mixture at the opposite end of the reactor, and with ... | 09/23/2003 |
| 6613949 | Oxygen enrichment process for air based gas phase oxidations which use metal oxide redox catalysts This invention is directed towards an improved process for the selective gas phase oxidation of a organic reactant using a metal oxide redox catalyst, wherein the organic reactant and air feeds are at a substantially continuous level, the improvement comp... | 09/02/2003 |
| 6593495 | Anhydride stabilization Disclosed herein are compositions comprising organic anhydrides having a reduced tendency to discolor with time, even when held at elevated temperatures for extended times. The compositions are produced by mixing at least one acid halide and various deriv... | 07/15/2003 |
| 6458971 | Process for the production of maleic anhydride Disclosed is a process for the preparation of maleic anhydride which comprises subjecting an aliphatic hydrocarbon having four or more carbon atoms to gas phase oxidation reaction in the presence of a catalyst, wherein supposing that the function of react... | 10/01/2002 |
| 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 |
| 6413903 | High surface area sol-gel route prepared oxidation catalysts This invention relates to catalysts useful in the vapor phase oxidation of hydrocarbons, such as 1,3-butadiene to furan and maleic anhydride. The catalysts comprise vanadium oxides, vanadium phosphorus oxides or vanadium antimony oxides incorporated in a ... | 07/02/2002 |
| 6310219 | Process for the production of maleic anhydride Disclosed is a process for the production of maleic anhydride, which comprises: reacting a hydrocarbon with an oxygen-containing gas in the presence of a catalyst; recovering maleic anhydride from the reaction gas; recovering unreacted hydrocarbon from th... | 10/30/2001 |
| 6300505 | Method and apparatus for improving the uniformity of distribution of a phosphorus-containing agent throughout a maleic anhydride catalytic reactor Improved methods and apparatus for the preparation of maleic anhydride by reacting a hydrocarbon having at least four carbon atoms in a straight chain with molecular oxygen in a catalytic reactor, the reactor comprising a fixed catalyst bed having active ... | 10/09/2001 |
| 6291686 | Exothermic process An exothermic oxidation process wherein a rotating bed containing a variable oxidation state material is cycled through a succession of stages including an oxidative regeneration stage including a step wherein an oxidising fluid is passed through the bed,... | 09/18/2001 |
| 6194588 | Method for production of maleic anhydride In the production of maleic anhydride by the contact of a raw material gas containing an aliphatic hydrocarbon of not less than 4 carbon atoms and molecular oxygen with a vanadium-phosphorus oxide catalyst, the raw material gas is caused to allow presence... | 02/27/2001 |
| 6194587 | Production of maleic anhydride N-butane and molecular oxygen are reacted in a first reactor to form maleic anhydride, the produced maleic anhydride is scrubbed to separate maleic anhydride values, n-butane is added to the scrubber gases and these are reacted in a second reactor to form... | 02/27/2001 |
| 6093835 | Process for producing maleic anhydride A process for producing maleic anhydride is described, which comprises (i) reacting a hydrocarbon with oxygen in a vapor phase in the presence of a catalyst to yield a reaction mixture gas containing maleic anhydride, (ii) bringing the reaction mixture ga... | 07/25/2000 |
| 6048987 | Process for producing coated catalysts for the synthesis of maleic anhydride by gas-phase oxidation There is a process for producing coated catalysts for the gas-phase oxidation of C4 hydrocarbons to maleic anhydride. A vanadyl phosphate catalyst precursor is prepared having a V/P ratio of from 1:0.5 to 1:2 and a mean vanadium oxidation state... | 04/11/2000 |
| 6046343 | Prevention of catalyst attrition and tar formation in manufacture of maleic anhydride Improved methods and apparatus for manufacture of maleic anhydride by catalytic oxidation of n-butane or other hydrocarbon having four carbon atoms in a straight chain over a fixed catalyst bed comprising a phosphorus vanadium oxide catalyst. Movement of ... | 04/04/2000 |
| 6005121 | High productivity process for the production of maleic anhydride An improved process for the manufacture of maleic anhydride by catalytic oxidation of a nonaromatic hydrocarbon having at least four carbon atoms in a straight chain, in which a gas containing oxygen and hydrocarbon is passed through a fixed catalyst bed ... | 12/21/1999 |
| 6002019 | Process for the production of petrochemicals Petrochemicals are produced by the vapor phase reaction of a hydrocarbon with air in the presence of a suitable catalyst. The petrochemical product is removed from the product gas stream, and part or all of the remaining gas stream is passed through a bed... | 12/14/1999 |
| 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 |
| 5959124 | Method of preparing maleic anhydride by vapor phase oxidation of hydrocarbon A vanadium-phosphorus oxide having an X-ray diffraction spectrum (Cu--K) showing main peaks of the diffraction angle 2θ(&#b1;0.2°) at 18.5°, 23.0°, 28.4°, 29.9°, and 43.1° and having the intensity ratio of the peaks of the diffraction a... | 09/28/1999 |
| 5932746 | Vanadium catalysts and their precursors Readily processible cluster compositions of vanadium and phosphorus are precursors to vanadium-phosphorus catalysts including vanadyl pyrophosphate and vanadylbis(metaphosphate).... | 08/03/1999 |
| 5895821 | Process for the calcination/activation of V/P/O catalyst An improved process for calcination and activation of a catalyst containing mixed oxides of vanadium and phosphorus (V/P/O) involving the addition of spray dried catalyst precursor to a fluidizing oxygen containing gas at a controlled rate such that the t... | 04/20/1999 |
