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公开(公告)号：US11059013B2
公开(公告)日：2021-07-13
申请号：US16619628
申请日：2018-06-13
Applicant: Dow Global Technologies LLC
Inventor： Matthew T. Pretz
Abstract: A method for processing a chemical stream includes contacting a feed stream with a catalyst in an upstream reactor section of a reactor having the upstream reactor section and a downstream reactor section, passing an intermediate product stream to the downstream reactor section, and introducing a riser quench fluid into the downstream reactor section, upstream reactor section, or transition section and into contact with the intermediate product stream and the catalyst to slow or stop the reaction. The method includes separating at least a portion of the catalyst from the product stream, passing the product stream to a product processing section, cooling the product stream, and separating a portion of the riser quench fluid from the product stream. The riser quench fluid separated from the product stream may be recycled back to the downstream reactor section, upstream reactor section, or transition section as the riser quench fluid.
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公开(公告)号：US10647634B2
公开(公告)日：2020-05-12
申请号：US16097719
申请日：2017-05-03
Applicant: Dow Global Technologies LLC
Inventor： Matthew T. Pretz , Lin Luo
IPC: C07C5/333
Abstract: A process for catalytic dehydrogenation comprising mixing fluidization gas a fluidization gas which comprises methane, natural gas, ethane, hydrogen, nitrogen or any combination thereof with a fluidized catalyst stream that has passed through a catalytic dehydrogenation reactor and has exited a catalyst separation zone to form a catalyst recycle stream; and recycling the catalyst recycle stream either directly or indirectly into a catalytic dehydrogenation reactor is provided.
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公开(公告)号：US10589242B2
公开(公告)日：2020-03-17
申请号：US16346586
申请日：2017-10-25
Applicant: Dow Global Technologies LLC
Inventor： Matthew T. Pretz , Mark W. Stewart , Ben J. Freireich , Madhusudhan Kodam , Brien A. Stears
Abstract: According to one or more embodiments, a fluid catalytic reactor may include a riser, a lower reactor portion, a transition portion, and a flow director. The riser may include a cross-sectional area, and the lower reactor portion may include a cross-sectional area. The transition portion may attach the riser to the lower reactor portion. The cross-sectional area of the riser may be less than the cross-sectional area of the lower reactor portion such that the transition portion is tapered inward from the lower reactor portion to the riser. The flow director may be positioned at least within an interior region of the transition portion. The flow director may include a body which affects the velocity profile of fluids moving from the lower reactor portion to the riser.
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公开(公告)号：US20200055015A1
公开(公告)日：2020-02-20
申请号：US16609905
申请日：2018-05-03
Applicant: Dow Global Technologies LLC
Inventor： Matthew T. Pretz
Abstract: A method for processing a chemical stream includes contacting a feed stream with a catalyst in a reactor portion of a reactor system causing a reaction which forms a product stream. The method includes separating the product stream from the catalyst, passing the catalyst to a catalyst processing portion of the reactor system, processing the catalyst in the catalyst processing portion, and passing a portion of the catalyst from the catalyst processing portion of the reactor system into a catalyst withdrawal system that includes a catalyst withdrawal vessel and a transfer line coupling the catalyst withdrawal vessel to the catalyst processing portion. Each of the catalyst withdrawal vessel and the transfer line include an outer metallic shell and an inner refractory lining. The method further includes cooling the catalyst in the catalyst withdrawal vessel from greater than or equal to 680° C. to less than or equal to 350° C.
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公开(公告)号：US10464036B2
公开(公告)日：2019-11-05
申请号：US15761557
申请日：2016-09-28
Applicant: Dow Global Technologies LLC
Inventor： Matthew T. Pretz , Don F. Shaw , Richard E. Walter , Madhusudhan Kodam
Abstract: A catalyst regenerator for combusting carbonaceous deposits from a catalyst comprising a first chamber which comprises a catalyst inlet for feeding spent catalyst with carbonaceous deposits to said first chamber, a supplemental fuel gas distributor, and a distributor for an oxygen containing gas for distributing oxygen containing gas into said first chamber to contact said spent catalyst and combust carbonaceous deposits and supplemental fuel which further deactivates the spent catalyst and generates flue gas; a riser section extending from said first chamber for transporting the spent catalyst and the flue gas, the riser section comprising an outer wall, at least one slot in the outer wall, and a riser termination device which comprises a substantially internally flat cover plate, at least one arm extending from the cover plate, wherein the arm extends about the slot from the outer wall, the arm comprising an outer shell that encloses the arm and wherein no internal portion of the cover plate extends above an upper surface of the outer shell of the at least one arm is provided. Further provided is a riser termination device.
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Patent Agency Ranking
66.发明申请公开(公告)号：US20190099745A1
公开(公告)日：2019-04-04
申请号：US16094582
申请日：2017-05-05
Applicant: Dow Global Technologies LLC
Inventor： Matthew T. Pretz , Liwei Li
Abstract: A process to react an oxygen containing regenerated catalyst stream prior to use in a fluidized bed reactor comprising providing a regenerated catalyst stream which comprises at least 0.001 wt % oxygen; reacting the regenerated catalyst stream with a fuel source thereby forming oxides and reducing the amount of oxygen in the regenerated catalyst stream to produce a usable regenerated catalyst stream; and injecting the usable regenerated catalyst stream into a hydrocarbon fluidized bed reactor is provided.
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公开(公告)号：US20170259238A1
公开(公告)日：2017-09-14
申请号：US15605074
申请日：2017-05-25
Applicant: Dow Global Technologies LLC
Inventor： Matthew T. Pretz
IPC: B01J8/34
CPC classification number: B01J8/34 , B01J8/0055 , B01J2208/00991 , C07C5/333 , C10G11/08 , C07C11/06
Abstract: A fluidized catalyst stripping unit for displacing entrained gas from catalyst particles comprising: a vessel housing a two stage cyclonic separation section which comprises one or more primary cyclonic separation devices and one or more secondary cyclones; a stripping section which comprises internals; and an inlet in fluid communication with a catalytic reactor to feed a particulate-fluid suspension to the two stage cyclonic separation section; wherein each primary cyclonic separation device comprises an internal cylindrical surface to separate a major fraction of the particulates from the suspension and form a vortex of reduced particulate content; a particulate discharge outlet from each secondary cyclone to the stripping section; wherein the particulate discharge outlet of the secondary cyclone is submerged in a catalyst bed located above the stripper internals, and wherein the stripping section comprises one or more bubble breaking grids within the catalyst bed and above the stripping internals is provided.
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公开(公告)号：US09725382B2
公开(公告)日：2017-08-08
申请号：US15034637
申请日：2014-10-14
Applicant: Dow Global Technologies LLC
Inventor： Matthew T. Pretz , Mark W. Stewart
CPC classification number: C07C5/3337 , C07C2521/04 , C07C2521/12 , C07C2523/08 , C07C2523/42 , C07C2523/62 , Y02P20/52 , C07C11/06
Abstract: An improved catalytic dehydrogenation process which process comprises contacting an alkane or alkyl aromatic feedstream with a dehydrogenation catalyst under catalytic conditions in an up-flow fluidized reactor, wherein the fluidized reactor comprises one or more reactors, which catalytic conditions include a temperature within a range of from 500 to 800° C., a weight hourly space velocity within a range of from 0.1 to 1000, a gas residence time within a range of from 0.1 to 10 seconds, and, subsequent to the fluidized reactor, effecting separation of entrained catalyst from reactor effluent by use of a cyclonic separation system, wherein the improvement comprises interposing a cooling means between an up-flow fluidized reactor and the cyclonic separation system to substantially halt thermal reactions, thereby effectively increasing overall molar selectivity to alkene product is provided.
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公开(公告)号：US20250128222A1
公开(公告)日：2025-04-24
申请号：US18572568
申请日：2022-06-24
Applicant: Dow Global Technologies LLC
Inventor： Matthew T. Pretz , Donald F. Shaw , Richard E. Walter , Albert Meza , Fermin Sandoval , Liwei Li
IPC: B01J3/02
Abstract: According to one or more embodiments, a plate grid distributor for distributing a fluid in a vessel or a plenum for removing a fluid from a vessel may include a plate and a skirt. The skirt may be in direct contact with the plate and may include a first portion and a second portion. The first portion may be in direct contact with the plate and the second portion may be in direct contact with the first portion. The first portion may have a first allowable stress and the second portion may have a second allowable stress. According to one or more other embodiments, a method of distributing a fluid through a plate grid distributor in a vessel may include passing the fluid into the vessel and directing the fluid through the plate grid distributor.
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公开(公告)号：US12280360B2
公开(公告)日：2025-04-22
申请号：US18257909
申请日：2021-12-15
Applicant: Dow Global Technologies LLC
Inventor： Lin Luo , Yang Yang , Matthew T. Pretz
Abstract: According to one or more embodiments of the present disclosure, a fluidization promoter useful for dehydrogenation includes from 0.1 wt. % to 10 wt. % gallium, from 5 ppm to 500 ppm platinum, less than 5 wt. % alkali metal or alkaline earth metal, and a support material. A median particle size of the fluidization promoter is from 20 μm to 50 μm. Catalyst systems useful for dehydrogenation and methods for producing olefins using the same are also disclosed.
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