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RE39794 Process for the simultaneous production of maleic anhydride and its hydrogenated derivatives  
A process is described for the co-production of maleic anhydride and at least one C 4 compound selected from butane-1,4-diol, γ-butyrolactone, and tetrahydrofuran in which maleic anhydride is...
6989454 Method for producing maleic anhydride  
A process for preparing maleic anhydride by heterogeneously catalyzed gas-phase oxidation of an n-butene-containing hydrocarbon stream by means of oxygen-containing gases in a shell-and-tube...
6960670 Method for production of maleic anhydride  
This invention discloses a method for producing maleic anhydride comprising an azeotropic distillation step to dehydrate a crude maleic acid-containing aqueous solution, which method is...
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...
6657097 Fluidized bed reactor  
Disclosed is a fluidized bed reactor wherein the average cross-sectional area occupied by a cooling coil, a dummy pipe and/or a cyclone leg is 10% or more of the average cross-sectional area of...
6652823 Process for the synthesis of VPO catalysts  
Process for the preparation of a vanadium phosphate catalyst comprising treatment of a vanadium compound with formic acid, water and a phosphorus compound.
6602476 Apparatus and process for heat exchange with fluid beds  
Apparatus and process for heat exchange with fluid beds comprises heat-exchange tubes located longitudinally with respect to the axis of a fluidization zone with a rectangular pitch, one side of...
6590071 Reversible aqueous pH sensitive lipidizing reagents, compositions and methods of use  
The present invention provides lipidized conjugates comprising an amino group-containing biologically active substance and a lipophilic group capable of penetrating a biological membrane. Under...
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...
6329532 Method for separating maleic anhydride from maleic anhydride-containing mixtures by stripping  
The invention relates to a process for the separation of maleic anhydride from the maleic anhydride-containing reactor offgases from the preparation of maleic anhydride by the oxidation of...
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...
6040460 High productivity process to produce maleic anhydride from n-butane  
In producing maleic anhydride by catalytic oxidation of n-butane in vapor phase using oxygen or enriched air as oxidation medium, the reaction mixture consists of butane, oxygen and a recycling...
6018057 Process for producing acid anhydrides  
A process for producing anhydrides by passing a solution of the acid, preferably an organic polyacid, which is to undergo anhydridation over an acidified clay and a process for producing the...
5973166 Method for the preparation of maleimides  
In accordance with the present invention, there are provided improved methods for the preparation of maleimide monomers. This new method for the synthesis of maleimides is clearly superior to those...
5942628 Method for the preparation of sulfo-N-hydroxy succinimade salts  
The salt of a sulfonated succinic acid is cyclized, then converted to novel sulfonated hydroxamic acids by reaction with hydroxylamine (which is added or formed in situ), and the novel hydroxamic...
5929255 Process for coproducing fumaric acid and maleic anhydride  
The present invention provides a process for recovering fumaric acid formed as a by-product during the production of maleic anhydride so that both fumaric acid and maleic anhydride are obtained....
5892057 Preparation of sulfo-N-hydroxysuccinimide salts  
The salt of a sulfonated succinic acid is cyclized, then converted to novel sulfonated hydroxamic acids by reaction with hydroxylamine (which is added or formed in situ), and the novel hydroxamic...
5731443 Liquid phthalic anhydride recovery process using a rectification tower  
A process for recovering phthalic anhydride as a liquid from a vapor phase oxidation product which comprises mixing the vapor phase oxidation product having a temperature in the range of about...
5688970 Process to recycle exhaust gases from n-butane conversion into maleic anhydride  
In producing maleic anhydride by catalytic oxidation of butane in vapor phase, the reaction mixture consists of butane and a recycle gaseous current made of compressed air and exhaust gas recovered...
5670660 Process for collecting airborne anhydrides  
An apparatus and process for the recovery of airborne anhydrides such as anhydride vapor or dust wherein these airborne anhydrides are contacted with hot glycol, such as diethylene glycol, in the...
5670659 Preparation of citraconic anhydride  
Citraconic anhydride is prepared in a single step by heating itaconic acid, optionally in an inert organic solvent medium, in the presence of a catalytically effective amount of an at least...
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...
5585502 Process and plant for the purification of raw maleic anhydride recovered from gaseous reaction mixtures  
In the purification of maleic anhydride obtained with an oxidation process, by means of absorption with an organic solvent and fractionation of the resulting liquid phase and purification of the...
5532384 Process for producing hydrocarbon partial oxidation products  
Hydrocarbon derivatives are produced by contacting a hydrocarbon with oxygen obtained from an air separation unit in the presence of a partial oxidation reaction catalyst. After separation of the...
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...
5520891 Cross-flow, fixed-bed catalytic reactor  
Disclosed are a fixed-bed, cross-flow catalytic reactor wherein reaction heat can be exchanged against a heat exchange medium circulating indirectly through the catalyst bed, and a catalytic...
5449792 Method for the production of maleic anhydride  
A method for the production of maleic anhydride in which a hydrocarbon of 4 to 6 carbon atoms is subjected to a vapor phase catalytic oxidation reaction in the presence of a metal oxide catalyst,...
5430181 Process for improving a controlled oxidation reaction  
Process for improving a controlled oxidation reaction between at least one reactant and oxygen, in which at least one reactant is reacted with oxygen or an oxygen containing gas, constituting a...
5360603 Packed bed arrangement useful for mixing and/or oxidation  
The present invention relates to processes and apparatus for mixing oxidizable reactants with oxidant and/or oxidizing oxidizable reactants. Through using particular mixing and/or oxidizing...
5319106 Stabilization of mixtures of maleic anhydride and acrylic acid during distillation  
In the production of maleic anhydride, a crude maleic anhydride is produced which contains acrylic acid and other by-products. The crude maleic anhydride is dissolved in a solvent and the acrylic...
5266291 Packed bed arrangement for oxidation reaction system  
The present invention relates to processes and apparatus for mixing oxidizable reactants with oxidant and oxidizing oxidizable reactants. When ammonia is used as the reactant, nitric acid can be...
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...
5262547 Process for the production of petrochemicals  
Petrochemicals are produced by the vapor phase reaction of a hydrocarbon with substantially pure oxygen in the presence of a suitable catalyst. In the improved process, the principal product is...
5260456 Process for producing itaconic anhydride  
A process for producing anhydrides by passing a solution of the acid, preferably an organic polyacid, which is to undergo anhydridation over an acidified clay and a process for producing the...
5252752 Process for the production of carboxylic anhydrides  
A process for the production of carboxylic anhydrides from aromatic hydrocarbons in gas phase oxidation by using a high activity and high selectivity fluid catalyst, comprising 50 to 95% by weight...
5245093 Reaction processes in a multi-stage fluidized bed  
A process for reacting a fluid phase (gaseous and/or liquid phase) in contact with a solid phase in a reaction zone, wherein the improvement in said process comprises reacting the fluid phase in...
5185455 Method for improving the performance of VPO catalysts  
An improvement in a process for the manufacture of maleic anhydride by catalytic oxidation of n-butane in the presence of trimethyl phosphate over a fixed bed vanadium phosphorus oxide catalyst in...
5157130 Method of preventing discoloring of maleic anhydride  
A monochloro-substituted aliphatic alcohol containing 3-8 carbon atoms, a copper compound and a zinc compound are added to maleic anhydride to prevent discoloration of the maleic anhydride....
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...
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...
5069687 Process of recovery of maleic anhydride from reaction gaseous mixtures  
Process for the recovery of maleic anhydride from a gaseous mixture thereof, in which the gaseous mixture containing maleic anhydride is contacted with an absorbant for the maleic anhydride to give...
5059697 Preparation of halogenated phthalic anhydrides  
A process for the aromatization of 4-chlorotetrahydrophthalic anhydride and 4,5-dichlorotetrahydrophthalic anhydride which comprises heating a solution of either substance in the presence of...
5026876 Process for producing maleic anhydride  
Crude maleic anhydride produced by catalytic oxidation is distilled and then n-propyl gallate, cuprous chloride and zinc chloride are added thereto. Alternatively, crude maleic anhydride is...
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...
4968818 Gamma-butyrolactone production process and catalyst therefor  
A catalytic hydrogenation process for converting maleic anhydride and/or succinic anhydride to gamma-butyrolactone, a novel selective catalyst for use in such process and a method of preparing the...
4961827 Obtaining very pure maleic anhydride from crude maleic anhydride  
Very pure maleic anhydride having a stable color is obtained by fractional distillation of crude maleic anhydride by a method in which the maleic anhydride vapor separated off from low boilers and...
4941895 Process for the continuous separation of maleic anhydride from process gases  
A process is disclosed for increasing the recovery of maleic anhydride from the product condenser. Maleic anhydride is added to the oxidation reactor gaseous effluent. Maleic acid buildup in the...
4921977 Obtaining maleic anhydride not prone to discolor  
Process for obtaining maleic anhydride that is not prone to discolor by treating crude maleic anhydride with oxygen, a gas mixture containing oxygen, or a substance that releases oxygen before or...
Matches 1 - 50 out of 113 1 2 3 >