-
公开(公告)号：US11584700B2
公开(公告)日：2023-02-21
申请号：US17433800
申请日：2020-02-04
Applicant: Dow Global Technologies LLC
Inventor： Hangyao Wang , Yu Liu , Ernest R. Frank , Lin Luo
IPC: C07C5/09
Abstract: A method for selectively hydrogenating acetylene in a cracked gas from a steam cracking unit for producing olefins may include separating a hydrogenation feed from the cracked gas. The hydrogenation feed may include acetylene, hydrogen, carbon monoxide, and at least one product. The method may further include contacting the hydrogenation feed with an acetylene hydrogenation catalyst, the contacting causing hydrogenation of at least a portion of the acetylene of the hydrogenation feed to produce a hydrogenation effluent. In response to a change in a composition of a feedstock to the steam cracking unit that results in a change in a hydrogen concentration in the hydrogenation feed, the method may further include determining the hydrogen concentration in the hydrogenation feed and increasing or decreasing a temperature of the hydrogenation feed based on the determined hydrogen concentration of the hydrogenation feed.
-
公开(公告)号：US11203559B2
公开(公告)日：2021-12-21
申请号：US17256688
申请日：2019-06-26
Applicant: Dow Global Technologies LLC
Inventor： Matthew T. Pretz , Hangyao Wang , Lin Luo
IPC: C07C5/333
Abstract: According to one or more embodiments presently disclosed, a method for processing a chemical stream may include contacting a feed stream with a catalyst in a reactor portion of a reactor system that includes a reactor portion and a catalyst processing portion. Contacting the feed stream with the catalyst may cause a reaction forming an effluent. The method may include separating the effluent stream from the catalyst, passing the catalyst to the catalyst processing portion, and processing the catalyst in the catalyst processing portion. Processing the catalyst may include passing the catalyst to a combustor, combusting a supplemental fuel stream in the combustor to heat the catalyst, and treating the heated catalyst with an oxygen-containing gas. The supplemental fuel stream may include at least 1 mol % of one or more hydrocarbons, and a weight ratio of catalyst to hydrocarbons in the combustor may be at least 300:1.
-
公开(公告)号：US20210371357A1
公开(公告)日：2021-12-02
申请号：US17272741
申请日：2019-08-15
Applicant: Dow Global Technologies LLC
Inventor： Lin Luo , Matthew T. Pretz
Abstract: According to one or more embodiments disclosed herein, methods for operating dehydrogenation processes during non-normal operating conditions, such as at start-up, shut-down, system recycle, or unit trip, are described. The methods may include contacting a feed stream with a catalyst in a reactor portion of a reactor system to form a reactor effluent stream, separating at least a portion of the reactor effluent stream from the catalyst, passing the catalyst to a catalyst processing portion and processing the catalyst, wherein processing the catalyst comprises contacting the catalyst with oxygen, passing the catalyst from the processing portion to the reactor portion, wherein the catalyst exiting the processing portion comprises at least 0.001 wt. % oxygen, and contacting the catalyst with supplemental hydrogen, the contacting removing at least a portion of the oxygen from the catalyst by a combustion reaction.
-
公开(公告)号：US10654035B2
公开(公告)日：2020-05-19
申请号：US16079362
申请日：2017-02-22
Applicant: Dow Global Technologies LLC
Inventor： Andrzej Malek , David Gordon Barton , Lin Luo
IPC: B01J38/44 , B01J38/18 , B01J23/62 , B01J23/96 , B01J38/30 , B01J38/34 , B01J23/08 , B01J23/92 , C07C5/32 , B01J38/14 , B01J35/10 , B01J38/02 , B01J35/02 , B01J21/12
Abstract: The present disclosure provides an air-soak containing regeneration process reducing its time. The process includes (i) removing surface carbon species from a gallium-based alkane dehydrogenation catalyst in a combustion process in the presence of a fuel gas; (ii) conditioning the gallium-based alkane dehydrogenation catalyst after (i) in air-soak treatment at a temperature of 660° C. to 850° C. with (iii) a flow of oxygen-containing gas having (iv) 0.1 to 100 parts per million by volume (ppmv) of a chlorine source selected from chlorine, a chlorine compound or a combination thereof; and achieving a predetermined alkane conversion percentage for the gallium-based alkane dehydrogenation catalyst undergoing the air-soak containing regeneration process using (i) through (iv) 10% to 50% sooner in air-soak treatment than that required to achieve the same predetermined alkane conversion percentage for the gallium-based alkane dehydrogenation catalyst undergoing the air-soak containing regeneration process using (i) through (iii), but without (iv).
-
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.
-
Patent Agency Ranking
公开(公告)号：US20240100510A1
公开(公告)日：2024-03-28
申请号：US18257909
申请日：2021-12-15
Applicant: Dow Global Technologies LLC
Inventor： Lin Luo , Yang Yang , Matthew T. Pretz
CPC classification number: B01J23/62 , B01J35/40 , C07C5/325 , C07C2523/08 , C07C2523/42 , C07C2523/62
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.
-
公开(公告)号：US11773038B2
公开(公告)日：2023-10-03
申请号：US17621919
申请日：2020-06-08
Applicant: Dow Global Technologies LLC
Inventor： Lin Luo , Hangyao Wang , Yu Liu , Matthew T. Pretz , Andrzej Malek
CPC classification number: C07C5/3337 , B01J23/62 , C07C4/04 , C07C5/333 , C07C7/167 , C07C2523/62
Abstract: A method for operating an acetylene hydrogenation unit in an integrated steam cracking-fluidized catalytic dehydrogenation (FCDh) system may include separating a cracked gas from a steam cracking system and an FCDh effluent from an FCDh system into a hydrogenation feed and an acetylene-depleted stream, the hydrogenation feed comprising at least hydrogen, CO, and acetylene. During normal operating conditions, at least 20% of the CO in the hydrogenation feed is from the cracked gas. The method may include contacting the hydrogenation feed with an acetylene hydrogenation catalyst to hydrogenate at least a portion of the acetylene in the hydrogenation feed to produce a hydrogenated effluent. The steam cracking is operated under conditions that increase CO production such that a concentration of CO in the cracked gas is great enough that when a flowrate of the FCDh effluent is zero, a CO concentration in the hydrogenation feed is at least 100 ppmv.
-
8.发明申请公开(公告)号：US20220340505A1
公开(公告)日：2022-10-27
申请号：US17860357
申请日：2022-07-08
Applicant: Dow Global Technologies LLC
Inventor： Matthew T. Pretz , Mark W. Stewart , Lin Luo , Hangyao Wang
IPC: C07C5/333 , B01J8/00 , B01J8/18 , B01J8/24 , B01J21/12 , B01J23/62 , B01J23/96 , B01J38/02 , B01J38/12
Abstract: A method for processing a chemical stream includes contacting a feed stream with a catalyst in a reactor portion of a reactor system that includes a reactor portion and a catalyst processing portion. The catalyst includes platinum, gallium, or both and contacting the feed stream with the catalyst causes a reaction which forms an effluent stream. The method includes separating the effluent stream from the catalyst, passing the catalyst to the catalyst processing portion, and processing the catalyst in the catalyst processing portion. Processing the catalyst includes passing the catalyst to a combustor, combusting a supplemental fuel in the combustor to heat the catalyst, treating the heated catalyst with an oxygen-containing gas to produce a reactivated catalyst, and passing the reactivated catalyst from the catalyst processing portion to the reactor portion. The supplemental fuel may include a molar ratio of hydrogen to other combustible fuels of at least 1:1.
-
公开(公告)号：US20220251005A1
公开(公告)日：2022-08-11
申请号：US17621945
申请日：2020-06-08
Applicant: Dow Global Technologies LLC
Inventor： Hangyao Wang , Lin Luo , Yu Liu , Matthew T. Pretz , Andrzej Malek
Abstract: A method for operating an acetylene hydrogenation unit of a steam cracking system that integrates a fluidized catalytic dehydrogenation (FCDh) effluent from a fluidized catalytic dehydrogenation (FCDh) system may include separating a cracked gas from the steam cracking system into at least a hydrogenation feed comprising at least acetylene, CO, and hydrogen, introducing the FCDh effluent to the separation system, combining the FCDh effluent with the cracked gas upstream of the separation system, or both. The method may include hydrogenating acetylene in the hydrogenation feed. Elevated CO concentration in the hydrogenation feed due to the FCDh effluent may reduce a reaction rate of acetylene hydrogenation. The acetylene hydrogenation unit may operate at an elevated temperature relative to normal operating temperatures when the portion of the FCDh effluent is not integrated, such that a concentration of acetylene in the hydrogenated effluent is less than a threshold acetylene concentration.
-
公开(公告)号：US20220024838A1
公开(公告)日：2022-01-27
申请号：US17496308
申请日：2021-10-07
Applicant: Dow Global Technologies LLC
Inventor： Matthew T. Pretz , Hangyao Wang , Lin Luo
IPC: C07C5/333
Abstract: According to one or more embodiments presently disclosed, a method for processing a chemical stream may include contacting a feed stream with a catalyst in a reactor portion of a reactor system that includes a reactor portion and a catalyst processing portion. Contacting the feed stream with the catalyst may cause a reaction forming an effluent. The method may include separating the effluent stream from the catalyst, passing the catalyst to the catalyst processing portion, and processing the catalyst in the catalyst processing portion. Processing the catalyst may include passing the catalyst to a combustor, combusting a supplemental fuel stream in the combustor to heat the catalyst, and treating the heated catalyst with an oxygen-containing gas. The supplemental fuel stream may include at least 1 mol % of one or more hydrocarbons, and a weight ratio of catalyst to hydrocarbons in the combustor may be at least 300:1.
-
-
-
-
-
-
-
-
-
Search Results
40
records
(took 0.057 seconds)
