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71.发明授权公开(公告)号：US11186656B2
公开(公告)日：2021-11-30
申请号：US16421529
申请日：2019-05-24
IPC分类号： C08F10/02
摘要： Silica composites and supported chromium catalysts having a bulk density of 0.08 to 0.4 g/mL, a total pore volume of 0.4 to 2.5 mL/g, a BET surface area of 175 to 375 m2/g, and a peak pore diameter of 10 to 80 nm are disclosed herein. These silica composites and supported chromium catalysts can be formed by combining two silica components. The first silica component can be irregularly shaped, such as fumed silica, and the second silica component can be a colloidal silica or a silicon-containing compound, and the second silica component can act as a glue to bind the silica composite together.
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72.发明授权公开(公告)号：US11173475B2
公开(公告)日：2021-11-16
申请号：US16571224
申请日：2019-09-16
发明人： Kathy S. Clear , Max P. McDaniel , William C. Ellis , Eric D. Schwerdtfeger , Deloris R. Gagan , Carlos A. Cruz , Masud M. Monwar
IPC分类号： B01J23/26 , B01J31/34 , C08F4/22 , C08F4/78 , C08F210/16 , C08F10/02 , B01J31/12 , B01J8/08 , B01J8/18 , B01J19/12 , C08F110/02 , B01J21/08 , B01J37/16 , B01J37/34
摘要： Catalyst preparation systems and methods for preparing reduced chromium catalysts are disclosed, and can comprise irradiating a supported chromium catalyst containing hexavalent chromium with a light beam having a wavelength within the UV-visible light spectrum. Such reduced chromium catalysts have improved catalytic activity compared to chromium catalysts reduced by other means. The use of the reduced chromium catalyst in polymerization reactor systems and olefin polymerization processes also is disclosed, resulting in polymers with a higher melt index.
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公开(公告)号：US11149098B2
公开(公告)日：2021-10-19
申请号：US16577423
申请日：2019-09-20
IPC分类号： C08F10/02 , C08F110/02 , C08F4/24
摘要： Processes for activating chromium polymerization catalysts, which can use lower maximum activation temperatures and shorter activation times than conventional activation methods, and provide polyethylenes with high melt indices, broader molecular weight distributions, and lower long chain branching content. The activation process can comprise heating a supported chromium catalyst in an inert atmosphere to a first temperature (T1) for a first hold time (tH1), followed by allowing the chromium catalyst to attain a second temperature (T2) in the inert atmosphere, then contacting the chromium catalyst with an oxidative atmosphere for a second hold time (tH2), in which T2 can be less than or equal to T1. Additional activation treatments and conditioning steps are disclosed which can be used to enhance the melt index potential of Phillips (Cr/silica) catalysts.
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公开(公告)号：US20210077981A1
公开(公告)日：2021-03-18
申请号：US17019428
申请日：2020-09-14
IPC分类号： B01J23/26 , C07C51/215 , C07C29/50 , B01J38/02 , B01J21/08 , B01J35/10 , B01J35/02 , B01J21/06 , C07C45/33 , C07C37/58
摘要： Processes for converting a hydrocarbon reactant into an alcohol compound and/or a carbonyl compound are disclosed, and these processes include the steps of forming a supported chromium catalyst comprising chromium in a hexavalent oxidation state, irradiating the hydrocarbon reactant and the supported chromium catalyst with a light beam at a wavelength in the UV-visible spectrum to reduce at least a portion of the supported chromium catalyst to form a reduced chromium catalyst, and hydrolyzing the reduced chromium catalyst to form a reaction product comprising the alcohol compound and/or the carbonyl compound. The supported chromium catalyst can be formed by heat treating a supported chromium precursor, contacting a chromium precursor with a solid support while heat treating, or heat treating a solid support and then contacting a chromium precursor with the solid support.
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75.发明申请公开(公告)号：US20200369796A1
公开(公告)日：2020-11-26
申请号：US16421529
申请日：2019-05-24
IPC分类号： C08F10/02
摘要： Silica composites and supported chromium catalysts having a bulk density of 0.08 to 0.4 g/mL, a total pore volume of 0.4 to 2.5 mL/g, a BET surface area of 175 to 375 m2/g, and a peak pore diameter of 10 to 80 nm are disclosed herein. These silica composites and supported chromium catalysts can be formed by combining two silica components. The first silica component can be irregularly shaped, such as fumed silica, and the second silica component can be a colloidal silica or a silicon-containing compound, and the second silica component can act as a glue to bind the silica composite together.
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公开(公告)号：US10722874B2
公开(公告)日：2020-07-28
申请号：US16774891
申请日：2020-01-28
发明人： Max P. McDaniel , Kathy S. Clear , Jeremy M. Praetorius , Eric D. Schwerdtfeger , Mitchell D. Refvik , Mark L. Hlavinka
摘要： A method comprising a) contacting a solvent, a carboxylic acid, and a peroxide-containing compound to form an acidic mixture wherein a weight ratio of solvent to carboxylic acid in the acidic mixture is from about 1:1 to about 100:1; b) contacting a titanium-containing compound and the acidic mixture to form a solubilized titanium mixture wherein an equivalent molar ratio of titanium-containing compound to carboxylic acid in the solubilized titanium mixture is from about 1:1 to about 1:4 and an equivalent molar ratio of titanium-containing compound to peroxide-containing compound in the solubilized titanium mixture is from about 1:1 to about 1:20; and c) contacting a chromium-silica support comprising from about 0.1 wt. % to about 20 wt. % water and the solubilized titanium mixture to form an addition product and drying the addition product by heating to a temperature in a range of from about 50° C. to about 150° C. and maintaining the temperature in the range of from about 50° C. to about 150° C. for a time period of from about 30 minutes to about 6 hours to form a pre-catalyst.
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公开(公告)号：US10669362B2
公开(公告)日：2020-06-02
申请号：US16387199
申请日：2019-04-17
IPC分类号： C08F110/02 , B01J37/02 , B01J21/08 , B01J23/26 , C08F10/02 , B01J37/08 , B01J31/04 , B01J31/34 , B01J31/38 , B01J21/06 , B01J31/02
摘要： A method of preparing a catalyst comprising a) contacting a titanium-containing compound, a solvating agent, and a solvent to form a solution; b) contacting the solution with a chrominated silica-support to form a pre-catalyst; and c) thermally treating the pre-catalyst by heating to a temperature of from about 400° C. to about 1000° C. for a time period of from about 1 minute to about 24 hours to form the catalyst.
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公开(公告)号：US10543480B2
公开(公告)日：2020-01-28
申请号：US15953930
申请日：2018-04-16
发明人： Max P. McDaniel , Kathy S. Clear , Jeremy M. Praetorius , Eric D. Schwerdtfeger , Mitchell D. Refvik , Mark L. Hlavinka
IPC分类号： B01J21/08 , B01J21/12 , B01J23/26 , B01J27/24 , B01J31/02 , B01J31/34 , B01J35/10 , B01J37/02
摘要： A pre-catalyst composition comprising a) a silica support comprising silica wherein an amount of silica ranges from about 70 wt. % to about 95 wt. % based upon a total weight of the silica support, b) a chromium-containing compound wherein an amount of chromium ranges from about 0.1 wt. % to about 5 wt. % based upon the amount of silica, c) a titanium-containing compound wherein an amount of titanium ranges from about 0.1 wt. % to about 20 wt. % based upon the amount of silica, d) a carboxylic acid wherein an equivalent molar ratio of titanium-containing compound to carboxylic acid ranges from about 1:1 to about 1:10, and e) a nitrogen-containing compound with a molecular formula containing at least one nitrogen atom wherein an equivalent molar ratio of titanium-containing compound to nitrogen-containing compound ranges from about 1:0.5 to about 1:10.
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公开(公告)号：US10323108B2
公开(公告)日：2019-06-18
申请号：US15298540
申请日：2016-10-20
IPC分类号： B01J21/08 , B01J23/26 , B01J37/08 , C08F4/78 , C08F110/02 , C08F10/02 , C08F210/02 , B01J35/10 , C08F4/18
摘要： A polymer having a long chain branching content peaking at greater than about 20 long chain branches per million carbon atoms, and a polydispersity index of greater than about 10 wherein the long chain branching decreases to approximately zero at the higher molecular weight portion of the molecular weight distribution. A polymer having a long chain branching content peaking at greater than about 8 long chain branches per million carbon atoms, a polydispersity index of greater than about 20 wherein the long chain branching decreases to approximately zero at the higher molecular weight portion of the molecular weight distribution. A polymer having a long chain branching content peaking at greater than about 1 long chain branches per chain, and a polydispersity index of greater than about 10 wherein the long chain branching decreases to approximately zero at the higher molecular weight portion of the molecular weight distribution.
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80.发明申请公开(公告)号：US20170198075A1
公开(公告)日：2017-07-13
申请号：US15334329
申请日：2016-10-26
IPC分类号： C08F210/16
CPC分类号： C08F210/16 , B01J23/26 , B01J27/132 , B01J27/135 , B01J35/1019 , B01J35/1023 , B01J35/1047 , B01J37/08 , B01J37/26 , C08F110/02 , C08F110/06 , C08F2410/01 , C08F10/02 , C08F4/24 , C08F4/025 , C08F210/14 , C08F2500/12 , C08F2500/04 , C08F2500/09
摘要： Methods for preparing a fluorided chromium catalyst can include a step of calcining a supported chromium catalyst at a peak calcining temperature to produce a calcined supported chromium catalyst, followed by contacting the calcined supported chromium catalyst at a peak fluoriding temperature with a vapor comprising a fluorine-containing compound to produce the fluorided chromium catalyst. The peak fluoriding temperature can be at least 50° C. less, and often from 200° C. to 500° C. less, than the peak calcining temperature. Polymers produced using the fluorided chromium catalyst can have a beneficial combination of higher melt index, narrower molecular weight distribution, and lower long chain branch content.
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