Patents by Inventor Swatantra Kumar SHRIVASTAVA
Swatantra Kumar SHRIVASTAVA has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 11802044Abstract: A process is proposed for producing pure hydrogen by steam reforming of a feed gas comprising hydrocarbons, preferably natural gas or naphtha, with a simultaneously low and preferably adjustable export steam flow rate. The process includes the steam reforming of the feed gas, for which the heat of reaction required is provided by combustion of one or more fuel gases with combustion air in a multitude of burners arranged within the reformer furnace. According to the invention, the combustion air, before being introduced into the burners, is heated by means of at least one heat exchanger in indirect heat exchange with the hot flue gas to temperatures of at least 530° C.Type: GrantFiled: September 23, 2021Date of Patent: October 31, 2023Assignee: L'Air Liquide, Société Anonyme pour l'Etude et l'Exploitation des Procédés Georges ClaudeInventors: Swatantra Kumar Shrivastava, Dieter Ulber, Mirko Huebel
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Patent number: 11702336Abstract: The invention relates to a process and a plant for producing pure hydrogen from an input gas containing hydrogen and hydrocarbons, in particular from a hydrogen-containing refinery off-gas, by steam reforming in a steam reforming stage and multi-stage hydrogen enrichment. According to the invention the input gas containing hydrogen and hydrocarbons is separated in a first hydrogen enrichment stage into a hydrogen-enriched substream and a hydrogen-depleted substream, wherein at least a portion of the hydrogen-enriched substream is supplied to a second hydrogen enrichment stage or introduced into the pure hydrogen product stream and at least a portion of the hydrogen-depleted substream is supplied to the steam reforming stage as a reforming feed stream or as part thereof and/or to the burners as a fuel gas stream.Type: GrantFiled: November 24, 2020Date of Patent: July 18, 2023Assignee: L'Air Liquide, Société Anonyme pour l'Etude et l'Exploitation des Procédés Georges ClaudeInventors: Swatantra Kumar Shrivastava, Mirko Huebel, Mrityunjoy Samaddar
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Publication number: 20230072910Abstract: A method for improving a reforming process by using renewable electrical energy as a heating input to the reforming process is provided. The method includes partially preheating combustion air using a first electrical heater, wherein the first electrical heater is configured to be supplied with the renewable electrical energy generated by a renewable source, wherein the first electrical heater is integrated in between a cold air preheater and a hot air preheater of a process plant that performs the reforming process; utilizing, by the first electrical heater, a bad based on an availability of the renewable electrical energy received from the renewable source; and providing, by the first electrical heater, the preheated combustion air at an outlet of the first electrical heater to a boiler of the process plant based on the bad utilized by the first electrical heater.Type: ApplicationFiled: August 19, 2022Publication date: March 9, 2023Inventors: Mrityunjoy Samaddar, Swatantra Kumar Shrivastava
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Publication number: 20220089437Abstract: A process is proposed for producing pure hydrogen by steam reforming of a feed gas comprising hydrocarbons, preferably natural gas or naphtha, with a simultaneously low and preferably adjustable export steam flow rate. The process includes the steam reforming of the feed gas, for which the heat of reaction required is provided by combustion of one or more fuel gases with combustion air in a multitude of burners arranged within the reformer furnace. According to the invention, the combustion air, before being introduced into the burners, is heated by means of at least one heat exchanger in indirect heat exchange with the hot flue gas to temperatures of at least 530° C.Type: ApplicationFiled: September 23, 2021Publication date: March 24, 2022Inventors: Swatantra Kumar SHRIVASTAVA, Dieter ULBER, Mirko HUEBEL
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Publication number: 20220081290Abstract: The invention relates to a process and a plant for producing hydrogen by steam reforming and high-temperature electrolysis. Steam reforming produces a synthesis gas from a carbon-containing starting material and steam. Process heat generated in the context of the steam reforming is utilized for producing steam from water. Thus-produced steam is utilized as reactant for producing an electrolysis product in a high-temperature electrolysis step, wherein the electrolysis product includes at least hydrogen and oxygen. Hydrogen is separated from the synthesis gas produced by steam reforming and from the electrolysis product produced by high-temperature electrolysis.Type: ApplicationFiled: September 10, 2021Publication date: March 17, 2022Inventor: Swatantra Kumar Shrivastava
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Patent number: 11274039Abstract: The invention relates to a process and an apparatus for producing an olefin-containing feed stream for a steam reforming plant. According to certain embodiments of the invention, the olefin-containing hydrocarbon starting material is for this purpose vaporized and catalytically hydrogenated. The hydrogenation product stream obtained is separated into a gaseous reforming feed stream, which is fed to a steam reforming plant, and a gaseous recycle stream. As a result of the cooling according to the invention of the gaseous recycle stream down to at least partial condensation thereof and the separate recirculation of the gaseous partial recycle stream and of the liquid partial recycle stream, the procurement of a large and complicated circulation compressor is avoided and electric energy for operating this compressor is saved.Type: GrantFiled: November 17, 2017Date of Patent: March 15, 2022Assignee: L'Air Liquide, Societe Anonyme Pour L'Etude Et L'Exploitation Des Procedes Georges ClaudeInventors: Yue Chen, Swatantra Kumar Shrivastava, Mrityunjoy Samaddar
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Publication number: 20210155478Abstract: The invention relates to a process and a plant for producing pure hydrogen from an input gas containing hydrogen and hydrocarbons, in particular from a hydrogen-containing refinery off-gas, by steam reforming in a steam reforming stage and multi-stage hydrogen enrichment. According to the invention the input gas containing hydrogen and hydrocarbons is separated in a first hydrogen enrichment stage into a hydrogen-enriched substream and a hydrogen-depleted sub stream, wherein at least a portion of the hydrogen-enriched substream is supplied to a second hydrogen enrichment stage or introduced into the pure hydrogen product stream and at least a portion of the hydrogen-depleted substream is supplied to the steam reforming stage as a reforming feed stream or as part thereof and/or to the burners as a fuel gas stream.Type: ApplicationFiled: November 24, 2020Publication date: May 27, 2021Inventors: Swatantra Kumar SHRIVASTAVA, Mirko HUEBEL, Mrityunjoy SAMADDAR
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Patent number: 10865351Abstract: The invention relates to a process and an apparatus for producing an olefin-containing feed stream for a steam reforming plant. According to the invention, the olefin-containing hydrocarbon starting material is for this purpose heated, vaporized and catalytically hydrogenated. The hydrogenation product stream obtained is separated in a separation apparatus into a gaseous reforming feed stream, which is fed to a steam reforming plant, and a gaseous recycle stream. Here, the entry temperature of the hydrogenation input stream into the hydrogenation reactor is regulated via the degree to which it is heated and/or via the size of the recycle stream. Safe operation of the hydrogenation reactor over a wide range of olefin contents in the hydrocarbon feed is made possible in this way.Type: GrantFiled: November 17, 2017Date of Patent: December 15, 2020Assignee: L'Air Liquide Societe Anonyme Pour L'Etude Et L'Exploitation Des Procedes Georges ClaudeInventors: Swatantra Kumar Shrivastava, Mrityunjoy Samaddar
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Publication number: 20190382669Abstract: The invention relates to a process and an apparatus for producing an olefin-containing feed stream for a steam reforming plant. According to the invention, the olefin-containing hydrocarbon starting material is for this purpose heated, vaporized and catalytically hydrogenated. The hydrogenation product stream obtained is separated in a separation apparatus into a gaseous reforming feed stream, which is fed to a steam reforming plant, and a gaseous recycle stream. Here, the entry temperature of the hydrogenation input stream into the hydrogenation reactor is regulated via the degree to which it is heated and/or via the size of the recycle stream. Safe operation of the hydrogenation reactor over a wide range of olefin contents in the hydrocarbon feed is made possible in this way.Type: ApplicationFiled: November 17, 2017Publication date: December 19, 2019Applicant: L'Air Liquide, Societe Anonyme pour I'Etude et I'Exploitation des Procedes Georges ClaudeInventors: Swatantra Kumar SHRIVASTAVA, Mrityunjoy SAMADDAR
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Publication number: 20190300365Abstract: The invention relates to a process and an apparatus for producing an olefin-containing feed stream for a steam reforming plant. According to certain embodiments of the invention, the olefin-containing hydrocarbon starting material is for this purpose vaporized and catalytically hydrogenated. The hydrogenation product stream obtained is separated into a gaseous reforming feed stream, which is fed to a steam reforming plant, and a gaseous recycle stream. As a result of the cooling according to the invention of the gaseous recycle stream down to at least partial condensation thereof and the separate recirculation of the gaseous partial recycle stream and of the liquid partial recycle stream, the procurement of a large and complicated circulation compressor is avoided and electric energy for operating this compressor is saved.Type: ApplicationFiled: November 17, 2017Publication date: October 3, 2019Applicant: L'Air Liquide, Societe Anonyme pour I'Etude et I'Exploitation des Procedes Georges ClaudeInventors: Yue CHEN, Swatantra Kumar SHRIVASTAVA, Mrityunjoy SAMADDAR
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Patent number: 10155661Abstract: An improved hydrogen generation system and method for using the same are provided. The system includes an HDS unit configured to desulfurize hydrocarbons, a pre-reformer configured to convert heavy hydrocarbons within the process gas stream to methane, a reformer configured to produce a syngas stream and a flue gas, a PSA unit configured to produce a product hydrogen stream and a PSA off-gas stream, and means for cooling the flue gas against a combustion air and the PSA off-gas stream to a temperature below the dew point of sulfuric acid.Type: GrantFiled: January 27, 2017Date of Patent: December 18, 2018Assignee: L'Air Liquide Societe Anonyme Pour L'Etude Et L'Exploitation Des Procedes Georges ClaudeInventors: Taekyu Kang, Swatantra Kumar Shrivastava, Maik Lehmann
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Publication number: 20180215617Abstract: An improved hydrogen generation system and method for using the same are provided. The system includes an HDS unit configured to desulfurize hydrocarbons, a pre-reformer configured to convert heavy hydrocarbons within the process gas stream to methane, a reformer configured to produce a syngas stream and a flue gas, a PSA unit configured to produce a product hydrogen stream and a PSA off-gas stream, and means for cooling the flue gas against a combustion air and the PSA off-gas stream to a temperature below the dew point of sulfuric acid.Type: ApplicationFiled: January 27, 2017Publication date: August 2, 2018Inventors: Taekyu KANG, Swatantra Kumar SHRIVASTAVA, Maik LEHMANN