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公开(公告)号：US11577955B2
公开(公告)日：2023-02-14
申请号：US16540300
申请日：2019-08-14
Inventor： Ramesh Gupta , Sumathy Raman , Hugo S. Caram , David C. Dankworth
Abstract: Systems and methods for molten media pyrolysis for the conversion of methane into hydrogen and carbon-containing particles are disclosed. The systems and methods include the introduction of seed particles into the molten media to facilitate the growth of larger, more manageable carbon-containing particles. Additionally or alternatively, the systems and methods can include increasing the residence time of carbon-containing particles within the molten media to facilitate the growth of larger carbon-containing particles.
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Patent Agency Ranking
公开(公告)号：US20240425759A1
公开(公告)日：2024-12-26
申请号：US18274021
申请日：2022-01-27
Inventor： Guang Cao , James R. Bielenberg , August W. Bosse , David C. Dankworth , Sumathy Raman , Michael Siskin
Abstract: Methods are provided for upgrading of pyrolysis carbon in order to allow for conversion of the pyrolysis carbon into higher value products. Instead of attempting to convert methane into a high value carbon product (such as carbon nanotubes) and H2 in a single reaction step, pyrolysis conditions can be used to form H2 and pyrolysis carbon. The pyrolysis carbon can then be treated in order to convert the pyrolysis carbon (H to C atomic ratio of less than 0.20) into a product with a higher hydrogen content (H to C atomic ratio of 0.25-0.9 or 2.0-7.0 wt % H). The treatment can correspond to exposing the pyrolysis carbon with hydrogen in the presence of a catalyst, exposing the pyrolysis carbon to conditions for alkylation, or a sequential combination thereof. This can convert the pyrolysis carbon into heavy hydrocarbon products that are resin-like solids at room temperature.
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公开(公告)号：US11591212B2
公开(公告)日：2023-02-28
申请号：US16540277
申请日：2019-08-14
Inventor： Ramesh Gupta , Sumathy Raman , Hugo S. Caram , David C. Dankworth
Abstract: Systems and methods for molten media pyrolysis for the conversion of methane into hydrogen and carbon-containing particles are disclosed. The systems and methods include the introduction of seed particles into the molten media to facilitate the growth of larger, more manageable carbon-containing particles. Additionally or alternatively, the systems and methods can include increasing the residence time of carbon-containing particles within the molten media to facilitate the growth of larger carbon-containing particles.
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公开(公告)号：US20240140792A1
公开(公告)日：2024-05-02
申请号：US18499472
申请日：2023-11-01
Inventor： Everett J. O'NEAL , David C. Dankworth , Lu Han , Sarah E. Feicht , Anastasios I. Skoulidas
CPC classification number: C01B3/26 , B01J19/0066 , B01J19/2485 , C01B2203/0238 , C01B2203/06 , C01B2203/1235
Abstract: Systems and methods are provided for performing both reforming and partial oxidation as part of the reaction step of a reaction cycle in a cyclic reaction environment such as a reverse flow reaction environment, where heat is provided by direct heating during a regeneration step. In some aspects, performing a combination of reforming and partial oxidation can allow for higher conversion of hydrocarbons than reforming alone while reducing or minimizing the peak temperatures within the cyclic reaction environment. In some aspects, performing both reforming and partial oxidation can also allow for an improved molar ratio of H2 to CO in the resulting effluent from the conversion reaction (relative to partial oxidation) while still maintaining high total conversion.
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公开(公告)号：US20240109775A1
公开(公告)日：2024-04-04
申请号：US18477591
申请日：2023-09-29
Inventor： Everett J. O'Neal , David C. Dankworth , Keith R. Hajkowski
CPC classification number: C01B3/386 , B01J19/0013 , B01J19/2485 , C01B3/384 , B01J2219/2413 , C01B2203/0233 , C01B2203/0811 , C01B2203/1241
Abstract: Systems and methods are provided for performing reforming in a manner where the flows for providing heat for the endothermic reforming reaction are counter-current to the flows for the reforming reaction. Although the flows are counter-current, the systems and methods also allow the heating profile of the reactor to have a temperature peak toward the middle of the reactor, as opposed to at the end of the reactor. This shift of the temperature peak toward the middle allows for improved heat utilization and recovery during operation of the reactor.
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公开(公告)号：US11629056B2
公开(公告)日：2023-04-18
申请号：US17124113
申请日：2020-12-16
Inventor： Ramesh Gupta , Sumathy Raman , Amrit Jalan , Hugo S. Caram , David C. Dankworth
IPC: C01B32/162 , B01J6/00
Abstract: Systems and methods are provided for production of carbon nanotubes and H2 using a reaction system configuration that is suitable for large scale production. In the reaction system, a substantial portion of the heat for the reaction can be provided by using a heated gas stream. Optionally, the heated gas stream can correspond to a heated H2 gas stream. By using a heated gas stream, when the catalyst precursors for the floating catalyst-chemical vapor deposition (FC-CVD) type catalyst are added to the gas stream, the gas stream can be at a temperature of 1000° C. or more. This can reduce or minimize loss of catalyst precursor material and/or deposition of coke on sidewalls of the reactor. Additionally, a downstream portion of the reactor can include a plurality of flow channels of reduced size that are passed through a heat exchanger environment, such as a shell and tube heat exchanger. This can provide cooling of the gas flow after catalyst formation to allow for carbon nanotube formation, while also reducing the Reynolds number of the flow sufficiently to provide laminar flow within the region where carbon nanotubes are formed.
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