Abrégé

The invention relates to an improved process for producing a catalyst useful for the epoxidation of ethylene to ethylene oxide. In forming the catalyst, a silver-impregnated support is subjected to two calcinations. The support is subjected to a first calcination in a first atmosphere comprising air. Next the support is subjected to a second calcination in a second atmosphere which is substantially entirely comprised of inert gas, and which second atmosphere is substantially absent of hydrogen. This two-stage calcination produces an improved catalyst which contains fewer organics left over under standard conditions of air calcination alone, while costing less than calcination in an inert gas alone.

Classes IPC  ?

• C07D 301/03 - Synthèse du cycle de l'oxirane par oxydation de composés non saturés, ou de mélanges de composés non saturés et de composés saturés
• C07D 301/10 - Synthèse du cycle de l'oxirane par oxydation de composés non saturés, ou de mélanges de composés non saturés et de composés saturés par l'air ou l'oxygène moléculaire en phase gazeuse avec des catalyseurs contenant de l'argent ou de l'or
• B01J 21/00 - Catalyseurs contenant les éléments, les oxydes ou les hydroxydes du magnésium, du bore, de l'aluminium, du carbone, du silicium, du titane, du zirconium ou du hafnium
• B01J 21/04 - Alumine
• B01J 20/00 - Compositions absorbantes ou adsorbantes solides ou compositions facilitant la filtrationAbsorbants ou adsorbants pour la chromatographieProcédés pour leur préparation, régénération ou réactivation
• B01J 23/00 - Catalyseurs contenant des métaux, oxydes ou hydroxydes métalliques non prévus dans le groupe
• B01J 23/02 - Catalyseurs contenant des métaux, oxydes ou hydroxydes métalliques non prévus dans le groupe des métaux alcalins ou alcalino-terreux ou du béryllium
• B01J 23/48 - Argent ou or
• B01J 23/50 - Argent

Abrégé

The invention pertains to a catalyst useful for the epoxidation of an olefin. More particularly, the invention pertains to an improved catalyst useful for the epoxidation of ethylene to ethylene oxide. The catalyst has improved selectivity in the epoxidation process. The catalyst comprises a solid support having a surface, which has a first mode of pores which have a diameter ranging from about 0.01 μm to about 5 μm and having a differential pore volume peak in the range of from about 0.01 μm to about 5 μm. The surface then has a second mode of pores, different from the first mode of pores, which second mode of pores have a diameter ranging from about 1 μm to about 20 μm and have a differential pore volume peak in the range of from about 1 μm to about 20 μm. On the bimodal pore surface is a catalytically effective amount of silver or a silver-containing compound, a promoting amount of rhenium or a rhenium-containing compound, and a promoting amount of one or more alkali metals or alkali-metal-containing compounds.

Classes IPC  ?

• C07D 301/06 - Synthèse du cycle de l'oxirane par oxydation de composés non saturés, ou de mélanges de composés non saturés et de composés saturés par l'air ou l'oxygène moléculaire en phase liquide
• B01J 29/00 - Catalyseurs contenant des tamis moléculaires
• B01J 29/04 - Catalyseurs contenant des tamis moléculaires ayant des propriétés d'échangeurs de base, p. ex. zéolites cristallines, argiles pontées
• B01J 29/06 - Zéolites aluminosilicates cristallinesLeurs composés isomorphes
• B01J 27/16 - PhosphoreSes composés contenant de l'oxygène
• B01J 21/00 - Catalyseurs contenant les éléments, les oxydes ou les hydroxydes du magnésium, du bore, de l'aluminium, du carbone, du silicium, du titane, du zirconium ou du hafnium
• B01J 21/04 - Alumine
• B01J 21/16 - Argiles ou autres silicates minéraux
• B01J 23/00 - Catalyseurs contenant des métaux, oxydes ou hydroxydes métalliques non prévus dans le groupe
• B01J 23/02 - Catalyseurs contenant des métaux, oxydes ou hydroxydes métalliques non prévus dans le groupe des métaux alcalins ou alcalino-terreux ou du béryllium
• B01J 23/48 - Argent ou or
• B01J 23/50 - Argent
• B01J 20/00 - Compositions absorbantes ou adsorbantes solides ou compositions facilitant la filtrationAbsorbants ou adsorbants pour la chromatographieProcédés pour leur préparation, régénération ou réactivation
• B01J 35/10 - Catalyseurs caractérisés par leur forme ou leurs propriétés physiques, en général solides caractérisés par leurs propriétés de surface ou leur porosité
• B01J 23/68 - Argent ou or avec de l'arsenic, de l'antimoine, du bismuth, du vanadium, du niobium, du tantale, du polonium, du chrome, du molybdène, du tungstène, du manganèse, du technétium ou du rhénium
• C07D 301/10 - Synthèse du cycle de l'oxirane par oxydation de composés non saturés, ou de mélanges de composés non saturés et de composés saturés par l'air ou l'oxygène moléculaire en phase gazeuse avec des catalyseurs contenant de l'argent ou de l'or
• C07D 303/04 - Composés contenant des cycles oxirane contenant uniquement des atomes d'hydrogène et de carbone en plus des atomes d'oxygène des cycles

Abrégé

The present invention relates to a method for recovering rhenium from an ethylene oxide catalyst containing rhenium and at least silver on a solid support, wherein at least a substantial portion of the rhenium present in the catalyst is extracted by intimate contact of the catalyst with one or more polar non-acidic organic solvents substantially free of water such that a rhenium-containing solution is formed containing the polar non-acidic organic solvent and extracted rhenium, the polar non-acidic organic solvent containing one or more oxygen, nitrogen, and/or halogen atoms in its molecular structure.

Classes IPC  ?

• C22B 11/00 - Obtention des métaux nobles

Abrégé

A geometrically shaped solid carrier is provided that improves the performance and effectiveness of an olefin epoxidation catalyst for epoxidizing an olefin to an olefin oxide. In particular, improved performance and effectiveness of an olefin epoxidation catalyst is achieved by utilizing a geometrically shaped refractory solid carrier in which at least one wall thickness of said carrier is less than 2.5 mm.

Classes IPC  ?

• B01J 35/04 - Structures non pleines, p.ex. tamis, grilles, nids d'abeilles
• B01J 35/02 - Catalyseurs caractérisés par leur forme ou leurs propriétés physiques, en général solides
• B01J 32/00 - Supports de catalyseurs, en général
• B01J 21/04 - Alumine
• B01J 21/06 - Silicium, titane, zirconium ou hafniumLeurs oxydes ou hydroxydes
• B01J 21/10 - MagnésiumSes oxydes ou hydroxydes
• B01J 23/50 - Argent
• B01J 23/16 - Catalyseurs contenant des métaux, oxydes ou hydroxydes métalliques non prévus dans le groupe de l'arsenic, de l'antimoine, du bismuth, du vanadium, du niobium, du tantale, du polonium, du chrome, du molybdène, du tungstène, du manganèse, du technétium ou du rhénium

Abrégé

A geometrically shaped solid carrier is provided that improves the performance and effectiveness of an olefin epoxidation catalyst for epoxidizing an olefin to an olefin oxide. In particular, improved performance and effectiveness of an olefin epoxidation catalyst is achieved by utilizing a geometrically shaped refractory solid carrier in which at least one wall thickness of said carrier is less than 2.5 mm.

Classes IPC  ?

• B01J 23/00 - Catalyseurs contenant des métaux, oxydes ou hydroxydes métalliques non prévus dans le groupe
• B01J 21/00 - Catalyseurs contenant les éléments, les oxydes ou les hydroxydes du magnésium, du bore, de l'aluminium, du carbone, du silicium, du titane, du zirconium ou du hafnium
• B01J 20/00 - Compositions absorbantes ou adsorbantes solides ou compositions facilitant la filtrationAbsorbants ou adsorbants pour la chromatographieProcédés pour leur préparation, régénération ou réactivation
• B01J 29/00 - Catalyseurs contenant des tamis moléculaires
• B01J 31/00 - Catalyseurs contenant des hydrures, des complexes de coordination ou des composés organiques

Abrégé

A solid (i.e., heterogeneous) catalyst useful for preparing an alkylene glycol from the corresponding alkylene oxide as well as a process for the catalytic hydration of an alkylene oxide to an alklyene glycol utilizing such a catalyst are provided. The catalyst of the present invention is based on an ion exchange resin including polystyrene crosslinked with from about 2 to about 10 weight (wt.) % divinyl benzene. The ion exchange resin further includes quaternary ammonium groups or quaternary phosphonium groups. The process includes reacting water and an alkylene oxide in at least one reactor under conditions to form an alkylene glycol, wherein the at least one reactor includes a catalyst based on an ion exchange resin that includes polystyrene crosslinked with from about 2 to about 10 weight (wt.) % divinyl benzene.

Classes IPC  ?

• B01J 31/06 - Catalyseurs contenant des hydrures, des complexes de coordination ou des composés organiques contenant des composés organiques ou des hydrures métalliques contenant des polymères
• C07C 29/10 - Préparation de composés comportant des groupes hydroxyle ou O-métal liés à un atome de carbone ne faisant pas partie d'un cycle aromatique à six chaînons par hydrolyse d'éthers, y compris d'éthers cycliques, p. ex. d'oxiranes

Abrégé

A solid (i.e., heterogeneous) catalyst useful for preparing an alkylene glycol from the corresponding alkylene oxide as well as a process for the catalytic hydration of an alkylene oxide to an alkylene glycol utilizing such a catalyst are provided. The catalyst of the present invention is based on an ion exchange resin including polystyrene crosslinked with from about 2 to about 10 weight (wt.) % divinyl benzene. The ion exchange resin further includes quaternary ammonium groups or quaternary phosphonium groups. The process includes reacting water and an alkylene oxide in at least one reactor under conditions to form an alkylene glycol, wherein the at least one reactor includes a catalyst based on an ion exchange resin that includes polystyrene crosslinked with from about 2 to about 10 weight (wt.) % divinyl benzene.

Classes IPC  ?

• C07C 27/00 - Procédés impliquant la production simultanée de plusieurs classes de composés contenant de l'oxygène

Abrégé

A process for initiating a highly selective ethylene oxide catalyst is provided in which the highly selective ethylene oxide catalyst is operated first as a 'standard' Ag-based catalyst (e.g., a catalyst that contains only silver and alkali metal, especially cesium). Moreover, the inventive initiation procedure is more efficient when the concentration of carbon dioxide in the feed is higher than 6 vol. %, and even more efficient when the concentration of carbon dioxide in the feed is higher than 10 vol. %, of the feed mixture during the initiation period.

Classes IPC  ?

• C07D 301/10 - Synthèse du cycle de l'oxirane par oxydation de composés non saturés, ou de mélanges de composés non saturés et de composés saturés par l'air ou l'oxygène moléculaire en phase gazeuse avec des catalyseurs contenant de l'argent ou de l'or

Abrégé

A process for initiating a highly selective ethylene oxide catalyst is provided in which the highly selective ethylene oxide catalyst is operated first as a ‘standard’ Ag-based catalyst (e.g., a catalyst that contains only silver and alkali metal, especially cesium). Moreover, the inventive initiation procedure is more efficient when the concentration of carbon dioxide in the feed is higher than 6 vol. %, and even more efficient when the concentration of carbon dioxide in the feed is higher than 10 vol. %, of the feed mixture during the initiation period.

Classes IPC  ?

• C07D 301/10 - Synthèse du cycle de l'oxirane par oxydation de composés non saturés, ou de mélanges de composés non saturés et de composés saturés par l'air ou l'oxygène moléculaire en phase gazeuse avec des catalyseurs contenant de l'argent ou de l'or

Abrégé

A method for controlling ethylene oxidation uses ethylene and oxygen, in conjunction with a silver based catalyst, a moderator and a co-moderator, to form ethylene oxide. When controlling the ethylene oxidation reaction, the moderator concentration is maintained constant within a comparatively narrow operative concentration range and the co-moderator concentration is varied within a comparatively wider operative concentration range, to optimize a catalyst property such as the catalyst activity and/or the catalyst selectivity.

Classes IPC  ?

• C07D 301/10 - Synthèse du cycle de l'oxirane par oxydation de composés non saturés, ou de mélanges de composés non saturés et de composés saturés par l'air ou l'oxygène moléculaire en phase gazeuse avec des catalyseurs contenant de l'argent ou de l'or

Abrégé

A method for assuring safety of a particular chemical process plant includes measuring, for each of a plurality of sets of proposed process conditions for a chemical process within the chemical process plant, a pressure rise rate following a deliberate contained ignition of at least one material used within the chemical process. A particular pressure rise rate that allows for a safe operation of the chemical reaction within the chemical process plant may be selected from the resulting pressure rise rates that correspond with the plurality of sets of proposed process conditions. The chemical process may be implemented within the process plant while using a set of process conditions from the plurality of sets of process conditions that corresponds with the selected pressure rise rate. In addition, the particular chemical reaction may also be optimized with respect to an ancillary parameter, such as product yield or feedstock utilization.

Classes IPC  ?

• C08F 2/00 - Procédés de polymérisation

Abrégé

The invention relates to a process for the epoxidation of an olefin, wherein the concentration of the olefin oxide in the outlet is greater than about 2.2% by volume. More particularly, the invention relates to a process for the epoxidation of ethylene by contacting a feed including at least ethylene and oxygen with an improved epoxidation catalyst. The catalyst which has improved selectivity in the epoxidation process at high productivities, includes a solid support having a surface, which has a first mode of pores that have a diameter ranging from about 0.01 μm to about 5 μm and having a differential pore volume peak in the range from about 0.01 μm to about 5 μm. The surface also has a second mode of pores, which is different from the first mode of pores, having a diameter ranging from about 1 μm to about 20 μm and have a differential pore volume peak in the range from about 1 μm to about 20 μm. On the bimodal pore surface is a catalytically effective amount of silver or a silver-containing compound, a promoting amount of rhenium or a rhenium-containing compound, and a promoting amount of one or more alkali metals or alkali-metal-containing compounds.

Classes IPC  ?

• C07D 301/10 - Synthèse du cycle de l'oxirane par oxydation de composés non saturés, ou de mélanges de composés non saturés et de composés saturés par l'air ou l'oxygène moléculaire en phase gazeuse avec des catalyseurs contenant de l'argent ou de l'or

Abrégé

A carrier for a catalyst useful for the epoxidation of an olefin which comprises an inert, refractory solid carrier is provided. The carrier has no or little absolute volume from small pores, of less than 1 micrometer, and large pores, of above 5 micrometer. By 'no or little absolute volume from small pores of less than 1 micron' it is meant that the pore volume of such pores is less than 0.20 ml/g. By 'no or little absolute volume from large pores of above 5 micron' it is meant that the pore volume of such pores is less than 0.20 ml/g. The invention further provides a catalyst useful for the epoxidation of an olefin supported on such a carrier and a process for the oxidation of an olefin, especially ethylene, to an olefin oxide, especially ethylene oxide.

Classes IPC  ?

• B01J 23/48 - Argent ou or
• C01B 13/00 - OxygèneOzoneOxydes ou hydroxydes en général
• C01B 31/00 - Carbone; Ses composés
• C01B 31/30 - Carbures
• C07D 301/10 - Synthèse du cycle de l'oxirane par oxydation de composés non saturés, ou de mélanges de composés non saturés et de composés saturés par l'air ou l'oxygène moléculaire en phase gazeuse avec des catalyseurs contenant de l'argent ou de l'or

Abrégé

The invention is a process for the epoxidation of an olefin, wherein the concentration of the olefin oxide in the outlet is greater than about 2.2 vol % with the use of an epoxidation catalyst. The catalyst which has improved selectivity in the epoxidation process, includes a bimodal support, with a first mode of pores that have a diameter ranging from about 0.01 to about 5 microns and having a differential pore volume peak in the range from about 0.01to about 5 microns and a second mode of pores, which is different from the first mode of pores, having a diameter ranging from about 1 to about 20 microns and have a differential pore volume peak in the range from about 1 to 20 microns. On the surface is a catalytically effective amount of silver, a promoting amount of rhenium, and a promoting amount of one or more alkali metals.

Classes IPC  ?

• B01J 23/58 - Métaux du groupe du platine avec des métaux alcalins ou alcalino-terreux ou du béryllium

Abrégé

A method to achieve a controlled start-up temperature of an expoxidation process which exceeds the maximum achievable temperature of the epoxidation reactor relative to using an external heat source. The method of the present invention employs an oxidation reaction within the reactor to bring the temperature of the reactor to a temperature that is suitable for conditioning a high selectivity catalyst. The method of the present invention includes first bringing a reactor including a high selectivity catalyst to a first temperature using the external heat source to the reactor, while staying within the reactor design limitations and maintaining a gas flow to the reactor that is within 25 to 100% of the design rates. Once the reactor has achieved the first temperature, at least an olefin, e.g., ethylene, and then oxygen are introduced to the reactor feed gas. The olefin and oxygen concentrations are adjusted to have a heat of reaction that will allow raising the reactor gas flow to 100% of design and then have sufficient heat of reaction to raise the reactor temperature to a second temperature which is greater than the first temperature and greater than the temperature of the reactor achievable by the external heat source.

Classes IPC  ?

• C07D 301/10 - Synthèse du cycle de l'oxirane par oxydation de composés non saturés, ou de mélanges de composés non saturés et de composés saturés par l'air ou l'oxygène moléculaire en phase gazeuse avec des catalyseurs contenant de l'argent ou de l'or

Abrégé

A catalytic process for preparing a monoalkylene glycol from a corresponding alkylene oxide utilizing an ion exchange resin and a reactor in which an upflow process is used is provided. In particular, the process includes reacting water and an alkylene oxide in at least one reactor under conditions to form an alkylene glycol, wherein the at least one reactor includes an ion exchange resin and the reactor is operating in an upflow direction.

Classes IPC  ?

• C07C 31/18 - Alcools polyhydroxyliques acycliques

Abrégé

A catalytic process for preparing a monoalkylene glycol from a corresponding alkylene oxide utilizing an ion exchange resin and a reactor in which an upflow process is used is provided. In particular, the process includes reacting water and an alkylene oxide in at least one reactor under conditions to form an alkylene glycol, wherein the at least one reactor includes an ion exchange resin and the reactor is operating in an upflow direction.

Classes IPC  ?

• C07C 29/10 - Préparation de composés comportant des groupes hydroxyle ou O-métal liés à un atome de carbone ne faisant pas partie d'un cycle aromatique à six chaînons par hydrolyse d'éthers, y compris d'éthers cycliques, p. ex. d'oxiranes

Abrégé

The invention pertains to a catalyst useful for the epoxidation of an olefin. More particularly, the invention pertains to an improved catalyst useful for the epoxidation of ethylene to ethylene oxide. The catalyst has improved selectivity in the epoxidation process. The catalyst comprises a solid support having a surface, which has a first mode of pores which have a diameter ranging from about 0.01 μm to about 5 μm and having a differential pore volume peak in the range of from about 0.01 μm to about 5 μm. The surface then has a second mode of pores, different from the first mode of pores, which second mode of pores have a diameter ranging from about 1 μm to about 20 μm and have a differential pore volume peak in the range of from about 1 μm to about 20 μm. On the bimodal pore surface is a catalytically effective amount of silver or a silver-containing compound, a promoting amount of rhenium or a rhenium-containing compound, and a promoting amount of one or more alkali metals or alkali-metal-containing compounds.

Classes IPC  ?

• B01J 21/00 - Catalyseurs contenant les éléments, les oxydes ou les hydroxydes du magnésium, du bore, de l'aluminium, du carbone, du silicium, du titane, du zirconium ou du hafnium
• B01J 23/50 - Argent
• B01J 23/00 - Catalyseurs contenant des métaux, oxydes ou hydroxydes métalliques non prévus dans le groupe
• B01J 20/00 - Compositions absorbantes ou adsorbantes solides ou compositions facilitant la filtrationAbsorbants ou adsorbants pour la chromatographieProcédés pour leur préparation, régénération ou réactivation

Abrégé

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 the presence of a vanadium phosphorus oxide (VPO) catalyst. An improved yield and selectivity in the production of maleic anhydride is attained by the addition of a substantially pure carbon monoxide gas stream in the reactant feed stream. A process is given for the production of maleic anhydride by reacting a combination of gas streams in the presence of a VPO catalyst. The combination of gas streams comprises an n-butane gas stream, an oxygen or oxygen-containing gas stream, and a substantially pure carbon monoxide gas stream. The amount of carbon monoxide present in the combination of gas streams is from about 0.5 volume % to about 6 volume % based on the total volume of the combination of gas streams.

Classes IPC  ?

• C07D 307/60 - Deux atomes d'oxygène, p. ex. anhydride succinique

Abrégé

This invention relates to catalyst carriers to be used as supports for metal and metal oxide catalyst components of use in a variety of chemical reactions. More specifically, the invention provides a process of formulating an alpha alumina carrier that is suitable as a support for silver and the use of such catalyst in chemical reactions, especially the epoxidation of ethylene to ethylene oxide. The composition comprises at least one hydrated precursor of alpha alumina; an optional alpha alumina; and a binder. The composition is substantially free of seeding particles.

Classes IPC  ?

• C07D 301/10 - Synthèse du cycle de l'oxirane par oxydation de composés non saturés, ou de mélanges de composés non saturés et de composés saturés par l'air ou l'oxygène moléculaire en phase gazeuse avec des catalyseurs contenant de l'argent ou de l'or
• C07D 301/03 - Synthèse du cycle de l'oxirane par oxydation de composés non saturés, ou de mélanges de composés non saturés et de composés saturés
• B01J 23/50 - Argent
• B01J 21/04 - Alumine
• B01J 23/00 - Catalyseurs contenant des métaux, oxydes ou hydroxydes métalliques non prévus dans le groupe
• B01J 31/00 - Catalyseurs contenant des hydrures, des complexes de coordination ou des composés organiques

Abrégé

A carrier and a catalyst useful for the oxidation of ethylene to ethylene oxide which uses the carrier. The carrier is composed of an inert, refractory solid support such as alpha alumina and has a surface exhibiting a plurality of nanometer scale protrusions projecting outwardly from the surface, and has a catalytically effective amount of silver thereon.

Classes IPC  ?

• C07D 301/10 - Synthèse du cycle de l'oxirane par oxydation de composés non saturés, ou de mélanges de composés non saturés et de composés saturés par l'air ou l'oxygène moléculaire en phase gazeuse avec des catalyseurs contenant de l'argent ou de l'or
• B01J 23/00 - Catalyseurs contenant des métaux, oxydes ou hydroxydes métalliques non prévus dans le groupe
• B01J 29/00 - Catalyseurs contenant des tamis moléculaires
• B01J 21/00 - Catalyseurs contenant les éléments, les oxydes ou les hydroxydes du magnésium, du bore, de l'aluminium, du carbone, du silicium, du titane, du zirconium ou du hafnium
• B01J 20/00 - Compositions absorbantes ou adsorbantes solides ou compositions facilitant la filtrationAbsorbants ou adsorbants pour la chromatographieProcédés pour leur préparation, régénération ou réactivation

Abrégé

This invention relates to an improved process for preparing silver catalysts useful for the vapor phase production of ethylene oxide from ethylene and oxygen. An inert support is impregnated with a solution of a catalytically effective amount of a silver containing compound, a promoting amount of an alkali metal containing compound, and a promoting amount of a transition metal containing compound. The impregnated support is calcined by heating at a temperature of from about 200° C. to about 600° C. to convert the silver in the silver containing compound to metallic silver and to decompose and remove substantially all organic materials. The heating is conducted under an atmosphere comprising a combination of an inert gas and from about 10 ppm to about 5% by volume of a gas of an oxygen containing oxidizing component.

Classes IPC  ?

• B01J 23/00 - Catalyseurs contenant des métaux, oxydes ou hydroxydes métalliques non prévus dans le groupe
• B01J 21/00 - Catalyseurs contenant les éléments, les oxydes ou les hydroxydes du magnésium, du bore, de l'aluminium, du carbone, du silicium, du titane, du zirconium ou du hafnium
• B01J 20/00 - Compositions absorbantes ou adsorbantes solides ou compositions facilitant la filtrationAbsorbants ou adsorbants pour la chromatographieProcédés pour leur préparation, régénération ou réactivation

Produits et services

Chemicals used in industry, in particular catalysts, catalyst carriers and adsorbents. Catalytic converters. Scientific and technological services and research in connection with catalysts, catalyst carriers and adsorbents; industrial analysis and research in connection with catalysts, catalyst carriers and adsorbents.

Produits et services

Chemicals used in industry, in particular catalysts, catalyst carriers and adsorbents. Catalytic converters. Scientific and technological services and research in connection with catalysts, catalyst carriers and adsorbents; industrial analysis and research in connection with catalysts, catalyst carriers and adsorbents.

Abrégé

A catalytic process for preparing a monoalkylene glycol from a corresponding alkylene oxide utilizing an ion exchange resin and a reactor in which an upflow process is used is provided. In particular, the process includes reacting water and an alkylene oxide in at least one reactor under conditions to form an alkylene glycol, wherein the at least one reactor includes an ion exchange resin and the reactor is operating in an upflow direction.

Classes IPC  ?

• C07C 29/10 - Préparation de composés comportant des groupes hydroxyle ou O-métal liés à un atome de carbone ne faisant pas partie d'un cycle aromatique à six chaînons par hydrolyse d'éthers, y compris d'éthers cycliques, p. ex. d'oxiranes
• C07C 31/20 - Alcools dihydroxyliques

Abrégé

A process for preparing a catalyst for maleic anhydride production wherein a
+5 vanadium compound such as , an anhydrous phosphonic acid, and optionally
promoters are admixed in an organic alcohol solvent, the admixture is rapidly
brought to reflux and thereafter refluxed to reduced the vanadium compound to
the desired degree, the reflux mixture is cooled, precursor crystals are
separated by filtration and then dried and calcined.

Classes IPC  ?

• B01J 27/198 - Vanadium

Abrégé

A method to achieve a controlled start-up temperature of an expoxidation process which exceeds the maximum achievable temperature of the epoxidation reactor relative to using an external heat source. The method of the present invention employs an oxidation reaction within the reactor to bring the temperature of the reactor to a temperature that is suitable for conditioning a high selectivity catalyst. The method of the present invention includes first bringing a reactor including a high selectivity catalyst to a first temperature using the external heat source to the reactor, while staying within the reactor design limitations and maintaining a gas flow to the reactor that is within 25 to 100 % of the design rates. Once the reactor has achieved the first temperature, at least an olefin, e.g., ethylene, and then oxygen are introduced to the reactor feed gas. The olefin and oxygen concentrations are adjusted to have a heat of reaction that will allow raising the reactor gas flow to 100% of design and then have sufficient heat of reaction to raise the reactor temperature to a second temperature which is greater than the first temperature and greater than the temperature of the reactor achievable by the external heat source.

Classes IPC  ?

• C07D 301/03 - Synthèse du cycle de l'oxirane par oxydation de composés non saturés, ou de mélanges de composés non saturés et de composés saturés
• C07D 301/10 - Synthèse du cycle de l'oxirane par oxydation de composés non saturés, ou de mélanges de composés non saturés et de composés saturés par l'air ou l'oxygène moléculaire en phase gazeuse avec des catalyseurs contenant de l'argent ou de l'or

Abrégé

A process for initiating a highly selective ethylene oxide catalyst is
provided in which the highly selective ethylene
oxide catalyst is operated first as a 'standard' Ag-based catalyst (e.g., a
catalyst that contains only silver and alkali metal, especially
cesium). Moreover, the inventive initiation procedure is more efficient when
the concentration of carbon dioxide in the feed is higher
than 6 vol. %, and even more efficient when the concentration of carbon
dioxide in the feed is higher than 10 vol. %, of the feed
mixture during the initiation period.

Classes IPC  ?

• C07D 301/10 - Synthèse du cycle de l'oxirane par oxydation de composés non saturés, ou de mélanges de composés non saturés et de composés saturés par l'air ou l'oxygène moléculaire en phase gazeuse avec des catalyseurs contenant de l'argent ou de l'or