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WO/2000/004994A1 |
The invention concerns a method for reactivating a catalyst for cyclizing hydrolysis of an aminonitrile for making lactams. More particularly, it concerns the reactivation of solid catalysts used in processes for producing lactams by cyc...
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WO/2000/003804A2 |
The invention relates to a method for regenerating a catalyst such as a plate or honeycomb catalyst that is at least partially deactivated as a result of toxic substances. The catalyst is treated with a gaseous reducing agent and a polyf...
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WO/2000/001484A1 |
A fluidized catalytic cracking (FCC) system including a fluidized catalytic cracking reactor (3) containing a catalyst, a regenerator (1), and an outboard vessel (2) connected to said regenerator (1) containing a vanadium trapping material.
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WO/2000/001483A1 |
The invention relates to a method for regenerating catalysts which catalyze the reduction of nitrogen oxides in the molecular nitrogen, which are essentially comprised of titanium oxide TiO¿2?, tungsten oxide WO¿3? and of the active co...
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WO/2000/001655A1 |
This invention relates to methods of controlling the oxidation of cyclohexane to adipic acid in the presence of a monobasic acid solvent, by separating the catalyst from the reaction mixture, outside the reaction zone. Substantially all ...
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WO/2000/001656A1 |
This invention relates to methods of controlling the oxidation of cyclohexane to adipic acid in the presence of a monobasic acid solvent, by extracting the catalyst from the reaction mixture, outside the reaction zone. Substantially all ...
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WO/1999/067023A1 |
The invention is directed to a process for the regeneration of a catalyst, said catalyst comprising at least one precious metal on an amorphous silica-alumina support, in which process the catalyst is impregnated with an acid, followed b...
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WO/1999/067509A1 |
The invention concerns a method for treating by combustion carbon-containing particles collected on a filter placed in an internal combustion engine exhaust circuit characterised in that said particle combustion is carried out by contact...
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WO/1999/061186A1 |
A process for recovering a solution of Co and Mn acetates and other valuable components of a waste residue of used catalyst discharged from a plant for the liquid-phase, homogeneously catalyzed oxidation of alkylaromatic compounds, to pr...
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WO/1999/058241A1 |
A method for regenerating a metal oxide fluidized bed catalyst containing molybdenum, bismuth and iron, which has been deteriorated by the use in reaction in the production of acrylonitrile through ammoxidation of propylene, which method...
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WO/1999/058238A1 |
The present invention discloses aqueous methods for enhancing the acid sites of fluid catalytic cracking (FCC) catalysts. The methods comprise the steps of contacting an FCC catalyst, either spent or fresh, with an aqueous solution compr...
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WO/1999/054041A1 |
A method for regeneration of sulfonic acid polystyrene resin catalyst used in the production of ether that results in recovery of over 98 % of the catalyst's potentially remaining activity comprising removing substantially all residual e...
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WO/1999/052629A1 |
The method of the present invention involves the in situ formation of metal-molibdate catalyst particles active for methanol oxidation to formaldehyde, with iron as an example, the catalyst is made by mixing particulate forms of Fe¿2?OÂ...
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WO/1999/052630A1 |
The method of the present invention involves in situ regeneration of metal-molybdate catalyst for methanol oxidation to formaldehyde comprising the step of regenerating spent metal-molybdate catalyst with an oxygen-free gas stream compri...
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WO/1999/051336A1 |
The present invention discloses aqueous methods for enhancing the acid sites of fluid catalytic cracking (FCC) catalysts. The methods comprise the steps of contacting an FCC catalyst, either spent or fresh, with an aqueous solution compr...
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WO/1999/049972A1 |
Process for activating an at least partly deactivated heterogeneous titanium-containing catalyst for the epoxidation of propene into propylene oxide, which process comprises adding a titanium compound to the liquid feed of an epoxidation...
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WO/1999/039827A1 |
The invention relates to a method for regenerating supported catalysts covered with gold particles, based on titanium dioxide or titanium dioxide hydrate and used for oxidising unsaturated hydrocarbons in a gas phase. The invention is ch...
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WO/1999/040299A1 |
Hydrocarbon in a carrier of nitrogen or steam is passed over a devitalized supported noble metal/alkali or alkaline earth catalyst/absorber, such as Pt on an alumina monolith coated with potassium carbonate, which has sorbed NOx from eng...
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WO/1999/033748A1 |
The invention concerns a method wherein the H¿2?S of a gas to be treated is sulphur oxidised by being contacted with an oxidation catalyst consisting of at least one oxysulphide of a metal selected among Ni, Fe, Co, Cu, Cr, Mo and W, as...
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WO/1999/033561A1 |
The invention concerns a method for regenerating a hydrogenation catalyst, and hydrogenation methods carried out with a catalyst comprising at least one regenerated catalyst. More particularly, it concerns a method for regenerating Raney...
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WO/1999/027239A1 |
A method and engine control strategy is described that enables improved catalyst performance after having been exposed to severe operating environments. More specifically, rhodium-containing catalysts are reactivated by being subjected t...
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WO/1999/016543A1 |
An endothermic reaction is effected using a heat transfer bed, containing a variable oxidation state material, which is cycled through a succession of stages including an oxidative regeneration stage employing passage of a hot oxidising ...
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WO/1999/011739A1 |
The invention concerns a device for separating and stripping a mixture of gas and particles, comprising a shell (51) including separation (2) and circulation (3) chambers distributed around a reactor (1), each separation chamber (2) comp...
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WO/1999/007469A1 |
Process to separate a group 8-10 metal/phosphite ligand complex from an organic liquid mixture, wherein the following steps are performed: (1) contacting the organic liquid with a support having bonded thereto an organophosphine ligand a...
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WO/1999/006386A1 |
An aqueous epoxidation process stream containing molybdenum and sodium values is incinerated and an aqueous solution containing molybdenum and sodium is recovered, acidified and reacted with a calcium compound without first adding base t...
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WO/1999/006503A1 |
A fluid cat cracking process for catalytically cracking a feed containing vanadium into lower boiling products, includes a cat cracker and a regenerator (14), with the feed entering the catalytic cracking zone preheated by indirect heat ...
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WO/1999/004902A1 |
A process for the generation of a hydration catalyst for cyclic olefins, i.e., a solid acid catalyst used in the hydration of a cyclic olefin by mixing an aqueous phase containing a solid acid catalyst with an oil phase containing a cycl...
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WO/1999/002258A1 |
A selective catalytic reduction body for the removal of nitrogen oxides (No¿x?), comprising about 5 to 80 % by weight of vanadium, about 0 to 60 % by weight of molybdenum, about 0 to 20 % by weight of nickel and about 0 to 20 % by weigh...
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WO/1999/001219A1 |
The present invention relates to methods for selectively converting oxygenates to light olefins, desirably ethylene and propylene, in which desirable carbonaceous deposits are maintained on a total reaction volume of catalyst by regenera...
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WO/1999/002016A1 |
An apparatus and method for the processing of a material (52) in a sealed rotating drum (10) by exposing the material (52) to a source of microwave energy (30), while the material is moving through the drum (10). The material (52) is mov...
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WO/1999/001445A1 |
Propylene is converted to propylene oxide in a highly efficient liquid phase process wherein temperature and pressure are both increased over the course of the epoxidation, which is preferably conducted in a continuous mode of operation....
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WO/1999/000191A2 |
Continuous process for the production of prevalently heavy hydrocarbons starting from synthesis gas in the presence of a gas phase, a liquid and a solid catalyst, the above process being carried out using a bubble column, characterized i...
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WO/1998/055228A1 |
The invention relates to a method for regenerating a zeolitic catalyst, comprising the following steps: (I) at least one partially deactivated catalyst is heated to a temperature ranging from 250 to 600 �C in an atmosphere containing l...
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WO/1998/055230A1 |
The invention relates to a method for renewed activation of honeycomb-shaped catalyst elements for denitrating flue gases from fossil fuel-fired boiler plants, specially coal-fired boiler plants in large power stations. According to the ...
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WO/1998/055430A1 |
The invention relates to a method for oxidizing an organic compound containing at least one C-C double bond or a mixture of two or more thereof, comprising the following steps: (I) production of a hydroperoxide; (II) reaction of an organ...
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WO/1998/050491A1 |
Partially deactivated catalyst in a slurry hydrocarbon synthesis process is rejuvenated employing a cyclic rejuvenation process in which syngas or CO flow into the slurry is stopped to stop the hydrocarbon synthesis reaction, the CO purg...
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WO/1998/050486A1 |
A reversibly deactivated, particulate catalyst in a slurry hydrocarbon synthesis slurry is rejuvenated by circulating the slurry from a slurry body through (i) a gas disengaging zone to remove gas bubbles from the slurry, (ii) a catalyst...
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WO/1998/050495A1 |
A reversibly deactivated, particulate catalyst in a hydrocarbon synthesis slurry is rejuvenated by circulating the slurry from a slurry body through (i) a gas disengaging zone to remove gas bubbles from the slurry and increase its densit...
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WO/1998/050489A1 |
A reversibly deactivated hydrocarbon synthesis catalyst in a hydrocarbon synthesis slurry is rejuvenated by successively passing the slurry through at least two rejuvenation stages external of the slurry reactor, each of which comprises ...
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WO/1998/050488A1 |
A reversibly deactivated, particulate catalyst in a hydrocarbon synthesis slurry is rejuvenated by circulating the slurry from a slurry body through a rejuvenation zone in which hydrogen contacts the slurry and rejuvenates the catalyst t...
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WO/1998/050490A1 |
A reversibly deactivated hydrocarbon synthesis catalyst in a hydrocarbon synthesis slurry is rejuvenated by passing the slurry into a lift pipe external of the reactor in which it contacts a hydrogen containing rejuvenating gas. The hydr...
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WO/1998/050485A1 |
Hydrogen containing tail gas from a hydrocarbon synthesis reactor is used as a hydrogen containing catalyst rejuvenating gas. If CO is present, the CO content is less than 10 mole % of the gas and the H�2? to CO mole ratio is greater t...
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WO/1998/039095A1 |
The invention concerns the application of a method for regenerating catalysts or adsorbents, consisting in causing the catalyst particles to rise in a vibrating helical elevator (12), said particles being subjected to a temperature profi...
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WO/1998/038225A1 |
A direct and/or alternating voltage is applied to a nonconductive fluid containing a boron trifluoride complex at least partly dispersed and/or dissolved therein to thereby precipitate the boron trifluoride complex, and the precipitate i...
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WO/1998/037963A1 |
This invention relates to a method for sulfiding hydrocarbon conversion catalysts. The catalysts which may be treated by the method of the present invention comprise an alumina or a silica-alumina support, and at least one Group VI metal...
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WO/1998/033589A1 |
This invention relates to a method of improving the catalytic performance of palladium or ruthenium, rhenium-on-carbon hydrogenation catalysts operating in aqueous media where loss of soluble rhenium may result in rapid catalytic failure...
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WO/1998/030656A1 |
A method of removing reactive metal from a metal-coated reactor system, comprising contacting at least a portion of a metal-coated reactor system containing reactive metal with a getter to produce movable metal, and fixating the movable ...
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WO/1998/028072A1 |
The catalytic activity of a titanium-containing heterogeneous catalyst such as titania-on-silica which has been used to catalyze olefin epoxidation is effectively restored by washing the catalyst with water, alcohol, ether, nitrile, este...
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WO/1998/026185A1 |
A subassembly of an electric motor and a fan for use in an air conditioner (10) includes a centrifugal fan (20) adapted for rotation about a longitudinal axis. The fan (20) has an open inlet end at one longitudinal end thereof and convex...
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WO/1998/024547A1 |
The present invention relates to a process for recovering cobalt carbonyl catalysts used to produce N-acyl-apha-aminoacid derivatives by amidocarbonylation, comprising the following steps: addition of an aqueous hydrogen peroxide solutio...
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