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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,...
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...
7345167 Method for the production of maleic anhydride  
A process for preparing maleic anhydride by oxidizing n-butane in the gas phase under heterogeneous catalysis with oxygen-containing gases over a vanadium-, phosphorus- and oxygen-containing...
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...
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...
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....
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...
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...
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...
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...
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...
6620948 Process for the preparation 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...
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...
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...
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.
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...
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,...
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...
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...
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...
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...
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 C 4 hydrocarbons to maleic anhydride. A vanadyl phosphate catalyst precursor is prepared having a V/P ratio of from...
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...
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...
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...
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...
5959124 Method of preparing maleic anhydride by vapor phase oxidation of hydrocarbon  
A vanadium-phosphorus oxide having an X-ray diffraction spectrum (Cu--Kα) showing main peaks of the diffraction angle 2θ(±0.2°) at 18.5°, 23.0°, 28.4°, 29.9°, and 43.1° and having the...
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).
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...
5869700 Method for recovering phthalic anhydride/maleic anhydride mixtures by distillation  
A process for recovering phthalic anhydride and maleic anhydride from a maleic anhydride-rich vapor phase oxidation product comprising the step of: contacting the vapor phase oxidation product...
5847163 Process for the transformation of a vanadium/phosphorus mixed oxide catalyst precursor into the active catalyst for the production of maleic anhydride  
A vanadium/phosphorus mixed oxide catalyst precursor is transformed into the active catalyst for the production of maleic anhydride. The activation takes place in a fluidized bed and includes the...
5734066 Supression of autoignition in maleic anhydride production  
An improved process for the manufacture of maleic anhydride by catalytic oxidation of n-butane in which the feed flow channel to the catalytic reactor contains an autoignition suppression agent...
5726327 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...
5707917 Catalyst 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...
5631387 Process for the preparation and recovery of maleic anhydride  
An improved process for the preparation and recovery of maleic anhydride in which the recovery of maleic anhydride from a gaseous reaction mixture includes absorbing the maleic anhydride in a...
5591870 Process for producing a vanadium-phosphorus oxide catalyst precursor  
A process for producing a vanadium-phosphorus oxide-containing catalyst precursor, which comprises (a) introducing into an organic solvent a vanadium alkoxide as a pentavalent vanadium compound and...
5550308 Vanadium (IV)-containing nasicon materials  
The present invention provides a composition of matter having the formula A x B 1 -x V y C 1 -y P 3 O 10 -15 wherein A is Nb or Ta, B is Sb, C is Ti or Sn, and 0≤x,y≤1, a composition of...
5532385 Catalytic process for the production of maleic anhydride  
The invention relates to vanadium/phosphorus oxide catalyst precursors useful in preparing catalysts useful in the oxidation of hydrocarbons containing 4 carbon atoms to maleic anhydride.
5530144 Process for producing a phosphorus-vanadium oxide catalyst precursor, process for producing a phosphorus-vanadium oxide catalyst, and process for producing maleic anhydride by vapor phase oxidation using the catalyst  
A process for producing a precursor of a phosphorus-vanadium oxide catalyst for production of maleic anhydride by vapor phase oxidation of a hydrocarbon having 4 carbon atoms, which comprises...
5521134 Method for regenerating vanadium/phosphorus oxidation catalysts  
A method of regenerating V/P/O oxidation catalyst used for the partial oxidation of n-butane which comprises terminating the n-butane feed and contacting the catalyst with an oxygen containing gas,...
5519149 Vapor phase catalytic oxidation of N-butane to maleic anhydride incorporating in situ catalyst calcination/activation  
An improved process for selective vapor phase oxidation of n-butane to maleic anhydride involving the use of a recirculating solids reactor having a reaction zone and a catalyst regeneration zone...
5510308 Cation and vanadium substituted heteropolyacid catalysts for vapor phase oxidation  
This invention relates to heteropolyacids characterized by their comprising phosphorus as the heteroatom and molybdenum and/or tungsten at octahedral sites, some of the molybdenum and/or tungsten...
5498731 Oxide catalyst and process for producing maleic anhydride by using oxide catalyst  
An oxide catalyst for producing maleic anhydride by vapor phase oxidation of a hydrocarbon having 4 carbon atoms, obtainable by (1) reacting a pentavalent vanadium compound and a pentavalent...
5401707 Vanadium/phosphorus oxide oxidation catalyst  
A vanadium/phosphorus oxide oxidation catalyst suitable for catalytic oxidation of C 4 feed stock in the preparation of maleic anhydride is formed by calcining an intercalation complex of the...
5364824 Catalysis for the production of maleic anhydride containing vanadium-phosphorus oxide with selected promoter elements  
A phosphorus vanadium oxide catalyst for the oxidation of a C 4 hydrocarbon. The catalyst comprises a shaped body having a volume, or a fixed bed comprising shaped bodies having an average volume,...
5360916 Two stage butane haleic anhydride process  
Butane is oxidized with molecular oxygen in a dilute state by bringing a mixture of vaporized butane and air of controlled butane content into the presence of a contact vanadium-phosphorus-oxygen...
5326886 Maintaining VPO catalyst performance by aluminizing reactor internals in oxidation of butane to maleic anhydride  
Catalysts comprising a compound of vanadium, phosphorus and oxygen which are employed in the oxidation of n-butane to maleic anhydride are protected from contamination caused by side reactions...
5296436 Phosphorous/vanadium oxidation catalyst  
An improvement in the oxidation catalyst used for the partial oxidation of n-butane and containing vanadium and phosphorus, zinc, lithium and molybdenum mixed oxides which comprises adding the...
5262548 Phosphorous/vanadium oxidation catalyst  
An improvement in the oxidation catalyst used for the partial oxidation of n-butane and containing vanadium and phosphorus, zinc and lithium mixed oxides which comprises adding a molybdenum...
5235071 Catalyst for producing phthalic anhydride and process by using the same  
The invention relates to a catalyst for producing phthalic anhydride by gas phase catalytic oxidation of o-xylene and/or naphthalene with molecular oxygen or gas containing molecular oxygen and, to...
Matches 1 - 50 out of 178 1 2 3 4 >