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| Number | Title | Issue Date |
| 7115537 | Process for the regeneration of zeolite catalysts A process for the regeneration of a zeolitic catalyst which is at least partially exhausted by use in the synthesis of optionally substituted methylenedianiline (MDA) and derivatives thereof, or of a mixture of optionally substituted MDA and derivatives thereof, wit... | 10/03/2006 |
| 6921731 | Process for regenerating Pd catalysts Process for regenerating a Pd catalyst after a homogeneously catalyzed C—C coupling reaction in which the Pd catalyst precipitates, is separated from the reaction mixture and subsequently treated with I2 or Br2. The Pd catalyst can then be us... | 07/26/2005 |
| 6610196 | Catalytic reforming process A substantially water-free hydrocarbon feed is charged to a reformer reactor operated under reforming conditions; thereafter, a chlorine-containing additive is introduced, without the simultaneous introduction of water, into the substantially water-free h... | 08/26/2003 |
| 6558532 | Catalytic reforming process While a substantially water-free hydrocarbon feed is being charged to a catalytic reformer reactor, an organic chloride is contacted with the reformer catalyst in an amount and for a time period that are effective to restore at least a portion of the acti... | 05/06/2003 |
| 6478952 | Catalytic reforming process including the addition of organic aluminum halide Deactivation of a reformer catalyst is inhibited by charging a hydrocarbon feed having a concentration of an organic aluminum halide compound to a reformer reactor operating under reforming conditions and containing a reformer catalyst.... | 11/12/2002 |
| 6458266 | Catalytic reforming process with inhibition of catalyst deactivation A substantially water-free hydrocarbon feed is charged to a multiple-reactor reformer system being operated under reforming conditions and comprising at least two reformer reactors serially connected in fluid-flow communication and each containing a refor... | 10/01/2002 |
| 6403514 | Process for the regeneration of zeolitic catalysts containing titanium A process is described for regenerating exhausted zeolitic catalysts containing titanium and deriving from oxidation processes of organic substrates with hydrogen peroxide. Said process consists in carrying out a treatment in an aqueous medium with hydrog... | 06/11/2002 |
| 6096673 | Catalyst recovery in the production of 2,5-dihydrofuran by isomerization of vinyl oxirane An improved process is provided for the recovery of catalyst components from oligomeric impurities which are formed during the industrial preparation of 2,5-dihydrofuran by the catalytic isomerization of vinyl oxirane followed by an essential separation o... | 08/01/2000 |
| 6071843 | Process for reactivating catalyst systems containing a platinum group metal Platinum metal-containing catalyst systems, which comprise at least one platinum metal, a co-catalyst and other salts, and which are used for the production of diaryl carbonates by the oxidative reaction of aromatic hydroxy compounds with carbon monoxide,... | 06/06/2000 |
| 5888920 | Integrated process using in situ regenerated sulfuric acid as catalyst This invention discloses an integrated process of alkylation of olefins and regeneration of spent sulfuric acid. The alkylation of olefins may be replaced by nitration of toluene or by chlor-alkali process. The sulfuric acid is used as a catalyst or a abs... | 03/30/1999 |
| 5565393 | Corrosion resistant equipment for manufacturing highly fluorinated alkanes Process is disclosed for preparing a highly fluorinated alkane by contacting halogenated alkenes or alkanes with hydrogen fluoride in the presence of a catalyst which produces a super acid environment. Also, performing the fluorination process by using eq... | 10/15/1996 |
| 5516735 | Method for stabilizing rhodium compound A concentrated catalyst solution provided in the carbonylation reaction in which methyl acetate or dimethyl ether is chemically bonded with carbon monoxide in the presence of a catalyst system comprising a rhodium compound and an alkali metal iodide to pr... | 05/14/1996 |
| 5391527 | Regeneration of a modified alkylation catalyst with hydrogen Catalytic composites of the reaction product of a metal halide having Friedel-Crafts activity with the bound surface hydroxyl group of inorganic oxides and containing a zerovalent metal with hydrogenation activity, often are effective catalysts in motor f... | 02/21/1995 |
| 5385875 | Method for stabilizing rhodium compound A concentrated catalyst solution used in a carbonylation reaction in which methyl acetate or dimethyl ether is chemically bonded with carbon monoxide in the presence of a catalyst system comprising a rhodium compound and an alkali metal iodide to produce ... | 01/31/1995 |
| 5364822 | Process for the recovery of group VIII noble metals In the process for recovery of Group VIII noble metal carbonylation catalyst from a process stream which also contains tar produced during a carbonylation process for carboxylic acid anhydride production, the process stream is diluted with alkyl halide an... | 11/15/1994 |
| 5310713 | Regeneration of an alkylation catalyst with hydrogen Catalytic composites of the reaction product of a metal halide having Friedel-Crafts activity with the bound surface hydroxyl group of inorganic oxides and containing a zerovalent metal with hydrogenation activity, often are effective catalysts in motor f... | 05/10/1994 |
| 5302360 | Method of working up antimony halide catalyst solutions A method for working up antimony halide catalysts containing inactivating organic impurities having high boiling points, in which anhydrous antimony trichloride can be isolated in a technically simple manner. The antimony trichloride can be chlorinated to... | 04/12/1994 |
| 5294415 | Process for the separation and recovery of rhodium from the products of the oxo synthesis To separate and recover rhodium, the distillation residues of oxo synthesis products are initially treated with an oxidant. Then the reaction mixture is reacted, in the presence of carbon monoxide (or a compound which splits off carbon monoxide), with an ... | 03/15/1994 |
| 5260238 | Process for regenerating a deactivated catalyst There is disclosed a process for regenerating a deactivated catalyst containing a zeolite and a noble metal of group VIII of the Periodic Table supported thereon which comprises subjecting the deactivated catalyst to decoking treatment under reductive or ... | 11/09/1993 |
| 5238889 | Process for the separation of oligomeric materials from a catalyst mixture Disclosed is a process for the recovery of catalyst values from mixtures of catalyst compounds and oligomeric materials. The process provides for the separation of (i) an onium iodide compound, (ii) an organotin iodide compound, or (iii) a mixture thereof... | 08/24/1993 |
| 5208194 | Recovery of group VIII transition metals from organic solutions using acidic ion-exchange resins A process for recovering a Group VIII metal from an organic solution is disclosed. The organic solution is contacted with an acidic ion exchange resin that has sulfonic acid active groups. The invention provides an effective and economical way to recover ... | 05/04/1993 |
| 5155073 | Demetallization of hydrocarbon conversion catalysts A demetallization process for catalysts used for chemical conversion of hydrocarbons, the catalysts containing at least vanadium as a metal poison, wherein the poisoned catalyst is contacted in a sulfiding zone with a sulfiding agent and a hydrocarbon hav... | 10/13/1992 |
| 5100850 | Oxidative secondary rhodium recovery process Disclosed is an oxidative process for recovering rhodium catalyst values from "tars" formed during the preparation of acetic anhydride by the rhodium catalyzed carbonylation of a mixture of methyl iodide and methyl acetate and/or dimethyl ether. The discl... | 03/31/1992 |
| 5047377 | Process for the purification and recovery of the contaminated solution of the catalyst produced on carbonylation of methanol and/or methyl acetate and/or dimethyl ether In a process for the purification and recovery of a contaminated catalyst solution produced during carbonylation of methanol and/or methyl acetate and/or dimethyl ether and containing carbonyl complexes of rhodium, organic and/or inorganic promoters, undi... | 09/10/1991 |
| 5021377 | Demetallization and passivation of spent cracking catalysts A process for reactivating a spent, metal-contaminated zeolite-containing catalytic cracking catalyst composition comprises partially demetallizing (preferably by chlorinating and washing) the spent catalytic cracking catalyst composition, and thereafter ... | 06/04/1991 |
| 4999326 | Palladium catalyst reactivation A reactivation process for a deactivated supported palladium catalyst involves contacting the catalyst with an organic polar solvent for naphthalenic compounds at a temperature below about 200° C. The organic polar solvent has a dielectric constant at 25... | 03/12/1991 |
| 4983559 | Process for presulfurizing with phosphorous and/or halogen additive Presulfurization of a catalyst used, e.g., for hydrocarbon conversion, wherein a polysulfide is employed as the sulfurization agent. In the first stage of the presulfurization, phosphorous, a halogen, or compounds thereof are introduced.... | 01/08/1991 |
| 4983558 | Process for presulfurizing a hydrocarbon treatment catalyst The invention relates to a process for treating a new or regenerated catalyst containing a support having as a base at least one metal or metalloid oxide and at least one active metal, comprising treating the catalyst with at least one sulfuration agent d... | 01/08/1991 |
| 4960742 | Spent antimony halide catalysts treatment A process is disclosed for dissolving and dispersing spent antimony halide catalysts by contact with methylene chloride.... | 10/02/1990 |
| 4952541 | Acrylonitrile dimerization process and method of treating residual catalyst Treatment of dicyanobutene to inactivate residual dimerization catalyst facilitates hydrogenation of the product to form adiponitrile.... | 08/28/1990 |
| 4945075 | Oxidative secondary rhodium recovery process Disclosed is a process for recovering rhodium catalyst values from "tars" formed during the preparation of acetic anhydride by the rhodium catalyzed carbonylation of a mixture of methyl iodide and methyl acetate and/or dimethyl ether. The disclosed proces... | 07/31/1990 |
| 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, with halogen-containing components and subsequently treatin... | 08/29/1989 |
| 4800186 | Regeneration of fluorocarbonsulfonic acid catalysts A method of regenerating a deactivated fluorocarbonsulfonic acid polymer catalyst by contacting the deactivated catalyst with a solvent combination wherein a first solvent swells the structure of the polymer and the other acts as a diluent to modify the s... | 01/24/1989 |
| 4787968 | Catalyst demetallization and process for using demetallized catalyst An improved catalyst demetallization process involves chlorinating the metal contaminated catalyst at elevated temperatures and contacting the chlorinated catalyst with a liquid aqueous composition to produce a demetallized catalyst. Improved catalytic ac... | 11/29/1988 |
| 4715948 | Improving the life of a catalyst used to process hydrocarbon containing feed streams In a hydrofining process, the life of a catalyst composition comprising a support selected from the group comprising alumina, silica and silica-alumina and a promoter comprising at least one metal selected from Group VIB, Group VIIB, and Group VIII of the... | 12/29/1987 |
| 4686197 | Catalyst demetallization and process for using demetallized catalyst An improved catalyst demetallization process involves chlorinating the metal contaminated catalyst at elevated temperatures and contacting the chlorinated catalyst with a liquid aqueous composition to produce a demetallized catalyst. Improved catalytic ac... | 08/11/1987 |
| 4629711 | Process for purifying and recovering contaminated catalyst solution obtained in the carbonylation of methyl acetate and/or dimethylether Catalyst solution contaminated during the carbonylation of methyl acetate and/or dimethylether, containing carbonyl complexes of rhodium, quaternary heterocyclic aromatic nitrogen compounds or quaternary organophosphorus compounds as organic promoters, un... | 12/16/1986 |
| 4612293 | Upgrading of spent butane isomerization catalyst to pentane isomerization catalyst A fluoride-containing platinum on alumina support isomerization catalyst useful for the isomerization of pentane to isopentane can be prepared by a several step treatment of substantially deactivated chloride-containing platinum on alumina support isomeri... | 09/16/1986 |
| 4515899 | Steam regeneration of phosphorus treated vanadium-phosphorus-oxygen catalysts The useful life of vanadium-phosphorus-oxygen (PVO) catalyst in fixed bed reactors can be substantially extended by treatment with a phosphorus compound followed by steam treatment. The PVO catalysts may be treated with steam after long periods (months) o... | 05/07/1985 |
| 4476238 | Separation of tars from carbonylation reaction mixtures Tarry residues often are formed in carbonylation reactions, such as those in which esters or ethers are carbonylated to produce ethylidene diacetate or carboxylic acid anhydrides, such as acetic anhydride. Such residues contain Group VIII noble metal cata... | 10/09/1984 |
