摘要:
Chemical production processes are provided that include exposing a reactant composition to a catalyst composition to form a product composition, with the reactant composition including a multihydric alcohol compound and the catalyst composition being effective to dehydrate at least a portion of the multihydric alcohol compound. Embodiments of the process provide that the reactant composition is exposed to the catalyst composition for less than about 0.25 seconds and/or that the catalyst is maintained at a temperature of from about 280° C. to about 320° C. Processes utilizing a reactant composition including a multihydric alcohol compound and an inert compound are also provided.
摘要:
Chemical production processes are provided that can include exposing a reactant composition to a catalyst composition to form a product composition. The reactant composition can include a multihydric alcohol compound and the product composition can include a carbonyl compound. The catalyst composition can include a metal effective to facilitate catalyst activation. Processes disclosed also include supplementing a dehydration catalyst with a promoter, and activating the supplemented catalyst in the presence of oxygen. Processes also include providing a supplemented dehydration catalyst to within a reactor, and exposing a multihydric alcohol compound to the dehydration catalyst, with the exposing forming coke within the reactor. Oxygen can be provided to the reactor to remove at least a portion of the coke.
摘要:
Chemical production processes are provided that can include exposing a reactant composition to a catalyst composition to form a product composition. The reactant composition can include a multihydric alcohol compound and the product composition can include a carbonyl compound. The catalyst composition can include a metal effective to facilitate catalyst activation. Processes disclosed also include supplementing a dehydration catalyst with a promoter, and activating the supplemented catalyst in the presence of oxygen. Processes also include providing a supplemented dehydration catalyst to within a reactor, and exposing a multihydric alcohol compound to the dehydration catalyst, with the exposing forming coke within the reactor. Oxygen can be provided to the reactor to remove at least a portion of the coke.
摘要:
Chemical production processes are provided than can include exposing a reactant composition to a catalyst composition to form a product composition, with the reactant composition including a multihydric alcohol compound and product composition including a carbonyl compound. The catalyst composition can include one or more elements of groups 5 and 6 of the periodic table of elements. Catalyst compositions are provided that can include one or more of niobia, hydrated niobia, tungstic acid, phosphotungstic acid, and phosphomolybdic acid.
摘要:
Chemical production processes are provided that can include exposing a reactant composition to a catalyst composition to form a product composition. Catalyst compositions are also provided that can include metal phosphate compositions, metal phosphorous compositions, and/or solid support compositions with the solid support compositions including one or more of F—Al2O3, ZrO2—CO2, SiO2—Al2O3—CO2, SiO2 Al2O3, Alundum, and Silica such as Ludox AS-30
摘要翻译:提供化学生产方法,其可以包括将反应物组合物暴露于催化剂组合物以形成产物组合物。 还提供催化剂组合物,其可以包括金属磷酸盐组合物,金属磷组合物和/或固体支持组合物,其中固体支持组合物包括F-Al 2 O 3,ZrO 2 -CO 2,SiO 2 -Al 2 O 3 -CO 2,SiO 2 Al 2 O 3,Alundum中的一种或多种 ,和二氧化硅如Ludox AS-30
摘要:
Chemical production processes are provided that can include exposing a reactant composition to a catalyst composition to form a product composition. Catalyst compositions are also provided that can include metal phosphate compositions, metal phosphorous compositions, and/or solid support compositions with the solid support compositions including one or more of F—Al2O3, ZrO2—CO2, SiO2—Al2O3—CO2, SiO2 Al2O3, Alundum, and Silica such as Ludox AS-30.
摘要翻译:提供化学生产方法,其可以包括将反应物组合物暴露于催化剂组合物以形成产物组合物。 还提供催化剂组合物,其可以包括金属磷酸盐组合物,金属磷组合物和/或固体支持组合物,其中固体支持组合物包括F-Al 2 O 3,ZrO 2 -CO 2,SiO 2 -Al 2 O 3 -CO 2,SiO 2 Al 2 O 3,Alundum中的一种或多种 ,和二氧化硅如Ludox AS-30。
摘要:
Hydrogenolysis processes are provided that can include providing a hydrogenolysis reactor having a catalyst therein. The catalyst can be exposed to a reducing agent in the absence of polyhydric alcohol compound while maintaining a temperature of the catalyst above 290° C. Hydrogenolysis processes can also include providing a passivated catalyst to within a reactor and exposing the catalyst to a reducing atmosphere while maintaining the catalyst at a temperature less than 210° C.Hydrogenolysis catalyst preparation methods are provided that can include exposing the catalyst to a first reducing atmosphere while maintaining the catalyst at a first temperature to reduce at least a portion of the catalyst. The method can also include passivating at least the portion of the catalyst and depassivating the portion of the catalyst in the presence of a second reducing atmosphere while maintaining the portion of the catalyst at a second temperature less than the first temperature.
摘要:
An in-vivo sensor assembly includes an assembly body having a body proximal end and a body distal end, a plurality of sensor elements including at least an analyte sensor element containing an enzyme that is a substrate of the analyte to be measured, a reference sensor element and a temperature sensor element disposed at or near the body distal end wherein the at least an analyte sensor element and the reference sensor element are exposed to the sample fluid and the temperature sensor is capable of measuring the temperature of and adjacent to the analyte sensor element, and an electrical coupling means disposed at the body proximal end and configured to couple to the at least an analytical sensor element, the reference sensor element and the temperature sensor element.
摘要:
An attachment mechanism for attaching a component to a cylindrical instrument having a centerline. The attachment mechanism includes legs having respective first and second ends. The legs are pivotally connected relative to each other at the first ends such that the second ends of the legs can be pivoted away from each other and toward each other. The legs are configured to be connected to the component. Each leg has an engagement piece at its second end. The engagement piece is configured to engage around the cylindrical instrument. Each engagement piece is oriented toward its corresponding leg at a fixed angle. The orientation of each of the engagement pieces to its corresponding leg positions the engagement pieces to contact the instrument at contact points in order that the component is located at a known and constant distance from the centerline regardless of the diameter of the instrument.
摘要:
The present invention relates to the use of at least one acid and at least one base and/or at least one reductant and at least one oxidant that when used with a polymerization catalyst in a polymerization process results in the controllable generation of a catalyst inhibitor that renders the polymerization catalyst substantially or completely inactive.