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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,...
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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...
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7442816 |
Antimony vanadium phosphate
A new composition, SbVPO 6+δ , in which 0≦δ≦ 1.5, has been prepared. Crystals of the compound have been grown by several methods, and the crystal structure has been determined. It is related...
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7354771 |
Method of determining absolute configuration of chiral compound
The absolute configuration of a chiral compound is determined by (i) coordinating the chiral compound to a metalloporphyrin having a carbon chain-crosslinked porphyrin dimer structure in which one...
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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....
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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...
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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...
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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...
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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...
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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...
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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...
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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).
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5929256 |
Production of maleic anhydride using molybdenum-modified vanadium-phosphorus oxide catalysts
An active catalyst having a crystal structure corresponding to that of a catalyst that has been prepared and activated by the following process. A substantially pentavalent vanadium-containing...
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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...
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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...
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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...
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5543532 |
Catalyst and method for vapor phase oxidation of alkane hydrocarbons
This invention relates to cation substituted catalysts based primarily upon vanadium pyrophosphate, useful in the oxidation of alkane hydrocarbons.
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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,...
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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...
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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,...
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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...
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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...
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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...
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5288880 |
Process for the manufacture of maleic anhydride
The present invention provides a process for the manufacture of maleic anhydride by the vapor phase catalytic oxidation of n-butane with molecular oxygen by the use of a specially prepared...
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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...
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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...
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5225574 |
Preparation of phthalic anhydride from o-xylene
Phthalic anhydride is prepared in a multiple tube reactor provided with separate salt baths, the temperature of the salt bath used for cooling the first layer of catalyst, as regarded in the...
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5155235 |
Catalyst for producing maleic anhydride from butane and process for preparing same
A catalyst for producing maleic anhydride by oxidation of n-butane comprising V,P and additionally Mg or Zr is prepared by (a) heating a pentavalent vanadium compound in an organic medium to...
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5128299 |
Process for producing crystalline oxide of vanadium-phosphorus system
A process for producing a crystalline oxide of vanadium-phosphorus system, which comprises hydrothermally treating an aqueous medium containing (1) a tetravalent vanadium compound, (2) a...
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5126463 |
Process for the production of anhydrides
This invention provides a process for the production of an anhydride by the vapor phase reaction of a hydrocarbon with substantially pure oxygen in the presence of a suitable catalyst. In the...
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5124291 |
Method for deagglomerating and re-exposing catalyst in a fluid bed reactor
A fluid bed catalyst which has lost activity or fluidization quality through agglomeration, contamination, or a physical or chemical change on the surface of the catalyst is deagglomerated and/or...
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5117007 |
Continuous process for the production of maleic anhydride from a C.sub.4 -hydrocarbon feedstock
A continuous process is disclosed for the production of maleic anhydride by the partial oxidation of a hydrocarbon feedstock comprising n-butane in a concentration of at least 1.6 mole percent...
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5095125 |
Maleic anhydride production
A catalyst comprising a phosphorus-vanadium mixed oxide and existing in the form of geometric shapes, such as tablets, provides minimum expansion of the geometric shapes under process reaction...
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5019545 |
Process for manufacture of maleic anhydride catalysts
Novel maleic anhydride catalysts comprising phosphorus-vanadium oxides and phosphorus-vanadium-co-metal oxides wherein said catalysts do not expand under reaction conditions for the manufacture of...
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4950769 |
Process for the manufacture of maleic anhydride utilizing peroxides to improve catalytic activity
A process for the manufacture of maleic anhydride using phosphorus-vanadium catalyst and peroxide modifiers.
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4918201 |
Process for preparation of maleic anhydride
The present invention relates to a process for the regeneration and stabilization of certain phosphorus-vanadium-oxygen complex catalysts or phosphorus-vanadium-oxygen co-metal complex catalysts,...
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4861738 |
Process for regenerating and stabilizing phosphorus-vanadium-oxygen complex catalysts
The present invention relates to a process for the regeneration and stabilization of certain phosphorus-vanadium-oxygen complex catalysts or phosphorus-vanadium-oxygen co-metal complex catalysts,...
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4855459 |
Process for the production of maleic anhydride
Maleic anhydride is produced by the catalytic vapor phase partial oxidation of a nonaromatic hydrocarbon having at least four carbon atoms in a straight chain with molecular oxygen or a molecular...
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4855457 |
Carboxylic anhydride process
In accordance with the process of this invention, an improved catalyst for molecular oxidation of a hydrocarbon to form the corresponding carboxylic anhydrides is prepared by the steps of (a)...
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4845241 |
Process for the manufacture of maleic
A catalyst for the oxidation of butane to produce maleic anhydride comprising a substrate containing phosphorus and vanadium or alternatively phosphorus, vanadium and a co-metal characterized by...
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4810803 |
Process for improving phosphorus-vanadium oxide and phosphorus vanadium-co-metal oxide catalysts in the oxidation of -butane to maleic anhydride
A process is disclosed for the improvement of a vanadium-phosphorus-oxygen catalyst or a vanadium-phosphorus-oxygen-co-metal catalyst suitable for use in the manufacture of maleic anhydride from...
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4795818 |
Optimizing the yield of maleic anhydride catalyst
A method of optimizing the yield of a vanadium-phosphorus catalyst during the oxidation of butane to maleic anhydride, which comprises establishing the temperature at which the catalyst provides...
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4782166 |
Process for producing maleic anhydride utilizing a catalyst containing a siliceous metal-containing crystalline composition
A novel siliceous crystalline composition of matter further comprising one or more metals is prepared by admixing a basic silica salt and a dissolved metal salt in the presence of a quaternary...
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4780548 |
Process for the manufacture of maleic anhydride utilizing catalysts reactivated with an ester of orthophosphoric acid in the presence of water
A process for the reactivation of vanadium-phosphorus-oxygen catalyst with alkyl esters of phosphoric acid and water is disclosed. The catalysts are useful for the manufacture of maleic anhydride...
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4748140 |
In situ activation process for fluid bed oxidation catalysts
A process for activating fluid bed catalysts useful for producing maleic anhydride from 4 carbon atom hydrocarbons is provided including contacting the fluidized catalyst containing the mixed...
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4713464 |
Process for production of maleic anhydride
Catalyst containing a vanadium/phosphorus complex oxide, for the oxidation of hydrocarbons to maleic anhydride. The catalyst contains 1 to 1.3 atoms of phosphorus per atom of vanadium. The pore...
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4699985 |
Process for oxidation of N-butane to maleic anhydride
An improved vanadium/phosphorus catalyst for the oxidation of n-butane to maleic anhydride is disclosed. Preferably, the catalyst contains a promoter. A process for the oxidation of n-butane to...
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4699895 |
Process for the manufacture of catalysts for the production of maleic anhydride
A process for the manufacture of a phosphorus-vanadium and phosphorus-vanadium co-metal catalysts suitable for use in the manufacture of maleic anhydride from benzene, butane, and other C 4 ...
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4670415 |
Process for the preparation of iron/lithium -promoted catalysts for the production of maleic anhydride
Iron/lithium promoted phosphorus-vanadium-oxygen catalysts for the production of maleic anhydride are prepared by contacting a substantially tetravalent vanadium-containing compound and a...
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4668802 |
Improved vapor phase catalytic oxidation of butane to maleic anhydride
Oxidation of butane to maleic anhydride using a vanadium-phosphorus oxide catalyst, in oxidized form, wherein the resulting reduced catalyst is separately regenerated. A recirculating solids...
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