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| Number | Title | Issue Date |
| 7355066 | Process for making terpene esters A process for making terpene esters is disclosed. Reaction of a terpene alcohol with acetic anhydride in the presence of a high-boiling amine provides a terpene ester. Acetic acid, which is distilled from the reaction mixture as it forms can be recovered. The terpen... | 04/08/2008 |
| 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 |
| 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 characterized by as an azeotropic solvent (1) using an organic solvent exhibitin... | 11/01/2005 |
| 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 |
| 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 |
| 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 |
| 6126996 | Metal complex source reagents for chemical vapor deposition A metalorganic complex of the formula: MAY X wherein: M is a y-valent metal; A is a monodentate or multidentate organic ligand coordinated to M which allows complexing of MAY with X; y is an integer having a value of 2, 3 or 4; each of the A ligands may ... | 10/03/2000 |
| 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. The process of the present invention further eliminates the ... | 07/27/1999 |
| 5895817 | Method and apparatus for direct oxygen injection with a reactant stream into a fluidized bed reactor A system provides an oxygen-bearing gas and gaseous reactant stream to a fluidized bed reactor using a sparger to entrain the oxygen-bearing gas into the reactant gas stream. A feed line couples the sparger to the reactor's fluidized bed and introduces th... | 04/20/1999 |
| 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 unreacted hydrocarbon in part or all of the remaining gas strea... | 03/10/1998 |
| 5646304 | Process for the production of petrochemicals A petrochemical is produced by the vapor phase reaction of a hydrocarbon with air in the presence of a suitable catalyst. The petrochemical is removed from the reactor effluent, and part or all of the remaining petrochemical-free gas stream is passed thro... | 07/08/1997 |
| 5646305 | 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... | 07/08/1997 |
| 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 hydrocarbon derivative from the reactor effluent, unreacted... | 07/02/1996 |
| 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 reaction mixture, in the presence of at least one additional ... | 07/04/1995 |
| 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 compound modifier in an amount of from about 0.005 to 0.025/1 Mo/... | 11/16/1993 |
| 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 calculated as TiO2 +SiO2 +B2 | 10/12/1993 |
| 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 a process for producing phthalic anhydride by using said ... | 08/10/1993 |
| 5225573 | Intermediates to tetrabromophthalic anhydride and process therefor Tetrabromophthalic anhydride and the corresponding free acid are propared by oxidizing in the liquid phase a compound of the formula ##STR1## each of A and A' is independently selected from oxygen, OH or acetoxy; each of R and R' is independently sel... | 07/06/1993 |
| 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 direction of flow of the reaction mixture, being from 2° to 20Â... | 07/06/1993 |
| 5179215 | Process for the production of petrochemicals An improved process is provided for the production of a petrochemical by the vapor phase reaction of a hydrocarbon with an oxygen-containing gas in the presence of a suitable catalyst to produce a flammable gaseous product stream comprising the desired pe... | 01/12/1993 |
| 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 improved process, the anhydride product is removed, carbon mono... | 06/30/1992 |
| 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 its surface re-exposed, by contacting the fluidized catalys... | 06/23/1992 |
| 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 conditions, since the catalyst in the form of said geometric s... | 03/10/1992 |
| 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 distilled in the presence of tridecyl phosphite. Further, these p... | 06/25/1991 |
| 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 maleic anhydride and a process for preparing these catalys... | 05/28/1991 |
| 4987239 | Process for the production of anhydrides An improved process is provided for the production of anhydrides from hydrocarbons by reaction with an oxygen-containing gas comprising oxygen, air or a gas enriched in oxygen relative to air, in the presence of a suitable catalyst. In the process, a sele... | 01/22/1991 |
| 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.... | 08/21/1990 |
| 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 condenser is reduced; condenser plugging is reduced; and pro... | 07/17/1990 |
| 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 while it is distilled.... | 05/01/1990 |
| 4864036 | Process for preparing aromatic carboxylic anhydride 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) forming a catalyst precursor by depositing on titanium dioxide ... | 09/05/1989 |
| 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) forming a catalyst precursor by depositing on titanium dioxide ... | 08/08/1989 |
| 4831164 | Process of preparing carboxylic anhydride In accordance with the process of this invention, an improved catalyst for molecular oxidation of hydrocarbons to form the corresponding carboxylic anhydrides is prepared by the steps of forming a catalyst precursor by depositing on titanium dioxide catal... | 05/16/1989 |
| 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 ammonium ion and subsequently heating under pressurized condit... | 11/01/1988 |
| 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 from C4 hydrocarbon benzene feedstock.... | 10/25/1988 |
| 4760153 | Process for producing maleic anhydride An improved process for producing maleic anhydride which comprises catalytically oxidizing benzene with a molecular oxygen-containing gas in the vapor phase in a multitubular heat-exchanger-type reactor. The process is characterized in that a catalyst-pac... | 07/26/1988 |
| 4728744 | Catalysts for preparation of aromatic carboxylic anhydrides In accordance with the process of this invention, an improved catalyst for molecular oxidation of an aromatic hydrocarbon to form the corresponding aromatic carboxylic anhydrides is prepared by the steps of forming a catalyst precursor by depositing on ti... | 03/01/1988 |
| 4710484 | Method for preparing a supported mixed-metal oxide oxidation catalyst Improved supported, mixed-metal oxide oxidation catalysts are prepared by conditioning a devolatilized catalyst precursor with an alcohol prior to calacining the precursor to a finished catalyst. For example, a promoted bismuth phosphomolybdate oxidation ... | 12/01/1987 |
| 4691053 | Process for producing organic compounds by utilizing oxygenic complexes A novel process for producing oxygen-containing organic compounds with high selectivity and good yield by oxidizing organic compounds under mild conditions is provided, which process comprises using as a catalyst for the oxidation, a complex (Mm | 09/01/1987 |
| 4675420 | Generation of reduced pressure in apparatuses in the preparation of phthalic anhydride and maleic anhydride In apparatuses for the preparation of phthalic anhydride and/or maleic anhydride by catalytic oxidation of naphthalene or o-xylene with air, reduced pressure is generated using liquid-jet pumps, and wash liquid is removed from the exit gas washer as a pum... | 06/23/1987 |
| 4658042 | Process for the preparation of maleic anhydride In the production of maleic anhydride, scale formation in an evaporator and pipes is a very difficult problem. By the process disclosed herein, scale formation in a maleic anhydride preparation apparatus can satisfactorily be prevented, and therefore, mal... | 04/14/1987 |
