| SD LIZENZVERWERTUNGSGESELLSCHAFT MBH & CO. KG Patent applications |
| Patent application number | Title | Published |
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| 20120041217 | TWO-STAGE CALCINATION FOR CATALYST PRODUCTION - 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. | 02-16-2012 |
| 20110257420 | CATALYST WITH BIMODAL PORE SIZE DISTRIBUTION AND THE USE THEREOF - 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. | 10-20-2011 |
| 20100314236 | METHOD OF CORROSION PREVENTION - This invention relates to a process for reducing the corrosion rate of iron-containing vessels within an ethylene glycol distillation system. The inventive process includes the addition of an additive component of sodium nitrite and sodium hypophosphite into such iron-containing vessels, to thereby react with iron of the inside walls and form a protective coating thereon. This process reduces the corrosion rate in iron-containing vessels of the apparatus, and reduces the catalytic effects of iron corrosion products within the system. Thus, not only is the on-stream time of the vessels extended, but also product quality is improved by reducing the aldehyde content of the final ethylene glycol product. | 12-16-2010 |
| 20100179336 | CARRIER FOR OLEFIN OXIDE CATALYST - 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. | 07-15-2010 |
| 20090277305 | RECOVERY OF RHENIUM - 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. | 11-12-2009 |
| 20090227820 | GEOMETRICALLY SIZED SOLID SHAPED CARRIER FOR OLEFIN EPOXIDATION CATALYST - 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. | 09-10-2009 |
| 20090099393 | SOLID CATALYST USEFUL FOR CONVERTING AN ALKYLENE OXIDE TO AN ALKYLENE GLYCOL - 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. | 04-16-2009 |
| 20090082584 | PROCESS FOR INITIATING A HIGHLY SELECTIVE ETHYLENE OXIDE CATALYST - 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. | 03-26-2009 |
| 20090069944 | CHEMICAL PROCESS OPTIMIZATION METHOD THAT CONSIDERS CHEMICAL PROCESS PLANT SAFETY - 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 particular chemical process within the particular chemical process plant, a pressure rise rate following a deliberate contained ignition of at least one material used within the particular chemical process. From the resulting plurality of pressure rise rates that corresponds with the plurality of sets of proposed process conditions a particular pressure rise rate that allows for a safe operation of the particular chemical reaction within the particular chemical process plant may be selected. The particular chemical process may be implemented within the particular chemical process plant while using a particular set of process conditions from the plurality of sets of process conditions that corresponds with the selected pressure rise rate. As an adjunct, the particular chemical reaction may also be subsequently and additionally optimized with respect to an ancillary parameter, such as product yield or feedstock utilization. | 03-12-2009 |
| 20090069583 | ETHYLENE OXIDE PRODUCTION USING FIXED MODERATOR CONCENTRATION - 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. | 03-12-2009 |
| 20090062557 | PROCESS FOR PRODUCTION OF AN OLEFIN OXIDE - 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. | 03-05-2009 |
| 20090062556 | CARRIER FOR OLEFIN OXIDE CATALYST - 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. | 03-05-2009 |
| 20080306291 | START-UP OF HIGH SELECTIVITY CATALYSTS IN OLEFIN OXIDE PLANTS - 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. | 12-11-2008 |
| 20080300431 | PROCESS FOR PREPARING AN ALKYLENE GLYCOL - 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. | 12-04-2008 |
