320results about "Hydrogen separation at low temperature" patented technology

The invention belongs to the technical field of ocean engineering and water electrolysis hydrogen production. In order to solve the problems that a traditional water cooling system is large in size and low in heat dissipation efficiency, a multi-scale thermal sensing network is deployed to collect data; establishing a multi-phase-change cross-scale heat transfer model; constructing a two-stage gradient composite cooling module; constructing and optimizing a cooling decision algorithm; designing a cooperative control loop; deep reinforcement learning control is implemented; creating a functional surface; and constructing a dynamic optimization system. The characteristics of part of the steps are limited, efficient heat management can be achieved, and stable operation of the floating type offshore hydrogen production platform cooling system is guaranteed.

The invention relates to a method and a system for synthesizing N-methylaniline and co-producing N, N-dimethylaniline by a gas phase method, and belongs to the technical field of chemical engineering. The system comprises a raw material gasification unit, a reaction unit, a separation and rectification unit and a hydrogen recovery unit which are connected through pipelines. The method comprises the following steps of: firstly, mainly synthesizing N-methylaniline from raw materials aniline and part of methanol in a first-methylaniline reactor, then partially or completely feeding first-methylaniline reaction gas into a second-methylaniline reactor, adding methanol steam, and further reacting to generate N, N-dimethylaniline. And after the product gas is subjected to heat exchange energy recovery, a liquid phase and a gas phase respectively enter the separation and rectification unit and the hydrogen recovery unit. The purification of N-methylaniline and N, N-dimethylaniline and the recovery of byproduct hydrogen are realized. The yield of N, N-dimethylaniline (in terms of aniline) can be adjusted in a range of 5-30% by adjusting reaction conditions and a feeding ratio.

A gas-liquid separation apparatus includes a tank and a flow reducing component. An inlet is formed in a middle of the tank. A hydrogen outlet is formed in a top of the tank. A processing chamber connected to the inlet. The flow reducing component is formed in the processing chamber and maintained above the inlet. The flow reducing component forms a flow reducing space and a flow partition chamber in a part of the processing chamber above the inlet, a gas-liquid initial separation space in the processing chamber and below the flow reducing component, at least one connection hole and a connection channel. The flow partition chamber is connected to the flow reducing space through the at least one connection hole. The gas-liquid initial separation space is connected to the flow partition chamber through the connection channel. The flow reducing space is arranged to be connected to the hydrogen outlet.

The present disclosure relates to a hydrogen purification system and method and a water electrolysis hydrogen production system. The hydrogen purification system includes three dryers, and the three dryers share a regeneration circulation module, which significantly reduces the number of heaters and coolers. Therefore, the manufacturing cost of the system is low. At the same time, a first gas-to-gas heat exchanger is provided in the regeneration circulation system, so that the low-temperature regenerated hydrogen before regeneration and the high-temperature regenerated tail gas after regeneration can exchange heat. On the one hand, this can make full use of the waste heat of the high-temperature regenerated tail gas, and on the other hand, it can significantly reduce the power consumption of subsequent heaters and regeneration coolers. Therefore, the energy consumption of the system is low.

A process for producing a hydrogen product where a carbon-containing input, by reforming and water gas shift, is converted into a synthesis gas largely consisting of hydrogen and carbon dioxide, from which a hydrogen fraction and a carbon dioxide fraction are separated, wherein the hydrogen fraction has the composition required for the hydrogen product and the carbon dioxide fraction has a purity which allows delivery thereof as a product or disposal thereof through sequestration. The characterizing feature here is that the synthesis gas consisting largely of hydrogen and carbon dioxide, by means of a first pressure swing adsorber, is fractionated into a carbon dioxide-depleted first PSA high-pressure fraction and a carbon dioxide-enriched first PSA low-pressure fraction, from which, after compression, the carbon dioxide fraction is obtained by cryogenic gas fractionation.

A compression unit for ammonia comprising a multi-stage compressor, including a first set of compressor stages adapted to compress a syngas containing hydrogen and nitrogen; and a second set of compressor stages adapted to compress a refrigerant of a refrigerant circuit. Described herein is also an ammonia production system including the ammonia compression unit and a method.

A plant and process for producing a hydrogen rich gas are provided, said process comprising the steps of: steam reforming a hydrocarbon feed into a synthesis gas; shifting the synthesis gas and conducting the shifted gas to a hydrogen purification unit, subjecting CO2-rich off-gas from the hydrogen purification unit to a carbon dioxide removal and recycling CO2-depleted off-gas rich in hydrogen to the process.

The invention discloses a high-temperature solid hydrogen storage and SOEC coupling hydrogen production and storage integrated system and method. The system comprises a water supply device, and the end of the water supply device is connected with a suction device; one end of the recovery device is connected with the suction device, and the other end is connected with a reaction device; the SOEC electrolytic reactor is connected with the reaction device, the SOEC electrolytic reactor comprises an anode end and a cathode end, and the anode end is connected with the recovery device; one end of the air delivery device is mounted between the reaction device and the SOEC electrolytic reactor, and the other end of the air delivery device is connected with a hydrogen high-temperature heat recovery device; the first end of the hydrogen medium-temperature heat recoverer is connected with the hydrogen high-temperature heat recovery device, the second end of the hydrogen medium-temperature heat recoverer is connected with the reaction device, the third end of the hydrogen medium-temperature heat recoverer is connected with a condenser, the fourth end of the hydrogen medium-temperature heat recoverer is connected with a dryer, and the condenser is connected with the dryer. Medium-temperature and high-temperature heat energy released in the hydrogen storage process of the high-temperature metal hydride is recycled through the heat recycling device and used for producing high-temperature superheated steam needed by SOEC electrolysis, and the good heat and mass synergistic effect is achieved on the whole.

A plant and process for producing a hydrogen rich gas are provided, said process comprising the steps of: reforming a hydrocarbon feed in a reforming step thereby obtaining a synthesis gas comprising CH4, CO, CO2, H2 and H2O; shifting said synthesis gas in a shift configuration including a high temperature shift step; removal of CO2 upstream hydrogen purification unit, such as a pressure swing adsorption unit (PSA), and recycling off-gas from hydrogen purification unit and mix it with natural gas upstream prereformer feed preheater, prereformer, reformer feed preheater or ATR or shift as feed for the process.

In a process in which ammonia is cracked to form a hydrogen gas product and an offgas comprising nitrogen gas, residual hydrogen gas and residual ammonia gas, residual ammonia is recovered from the offgas from the hydrogen recovery process by partial condensation and phase separation, and hydrogen is recovered from the resultant ammonia-lean offgas by partial condensation and phase separation. The recovered ammonia may be recycled the cracking process and the recovered hydrogen may be recycled to the hydrogen recovery process to improve hydrogen recovery from the cracked gas. Overall hydrogen recovery from the ammonia may thereby be increased to over 99%.

A plant including a reverse water gas shift (RWGS) section including a first feed including hydrogen to the RWGS section, and a second feed including carbon dioxide to the RWGS section, or a combined feed comprising hydrogen and carbon dioxide to the e-RWGS section, a water removal section downstream the RWGS section, a compressor downstream the water removal section, and a cryogenic CO2 separation section downstream the compressor, wherein the plant has means for recycling at least a portion of a CO2 rich condensate to the RWGS section or to a feed to the RWGS section, and wherein the RWGS section is an electrically heated RWGS (e-RWGS) section.

An embodiment described herein provides a method of treating a gas stream, where the method includes: flowing the gas stream containing H2S and CO2 into a plasma reactor; igniting a plasma in the plasma reactor containing the gas stream; decomposing the H2S to generate H2 and elemental sulfur in the plasma generating a product gas stream; condensing the elemental sulfur from the product gas stream as a liquid; and separating the H2 from the product gas stream.

Hydrogen production plant comprising: - At least one reformer (30) for converting a stream comprising a hydrocarbon feedstock (1) through conversion with steam rich in oxygen (02) into a reformed gas stream (32) comprising hydrogen, carbon monoxide, carbon dioxide and at least one hydrocarbon as impurity, said reformer (30) comprising exothermic, oxygen-based autothermal (ATR) or partial oxidation (POX) reforming and a heat recovery section (40), - A fired heater (90) configured to preheat the stream comprising the hydrocarbon feedstock (1) before entry into the at least one reformer (30), - At least one water gas shift (WGS) reactor (50) for converting the carbon monoxide of the reformed gas stream (32) into a shifted gas stream (51) containing additional carbon dioxide and hydrogen, - A Hydrogen and Carbon Dioxide Recovery Unit (60) located downstream of the WGS reactor (50) and configured to remove carbon dioxide and hydrogen from the shifted gas stream (51), and to produce a first product stream (61) enriched in carbon dioxide and a second product stream (62) enriched in hydrogen, a waste stream (63) depleted in both hydrogen and carbon dioxide, - A compressor (70) for compressing a part (65) of the waste gas stream (63) from hydrogen and carbon dioxide recovery unit (60) into a compressed gas stream (71), - A membrane separation system (80) selective for the permeation of hydrogen configured to be fed with the compressed gas stream (71) and to produce a hydrogen- enriched permeate (82) stream and a hydrocarbon-enriched retentate (81) stream, - A passageway for feeding at least part of the hydrogen-enriched permeate (82) to the fired heater (90) to be used as a low-carbon fuel by the fired heater (90), and - A passageway for recycling the hydrocarbon-enriched retentate (81) to the hydrocarbon feed (1) via a pipeline (83) and / or to the reformer (30) via the pipeline (85) and / or to the inlet to the water gas shift reactor (50) via the pipeline (87).

The power generation system comprises a fuel cell unit adapted to generate electric power using a hydrocarbon-containing gas. A water-gas shift reactor is adapted to receive flue gas from the fuel cell unit and convert carbon monoxide contained in the flue gas into carbon dioxide and hydrogen. A cryogenic carbon dioxide capture unit is adapted to receive flue gas from the water-gas shift reactor and remove carbon dioxide therefrom. A recycle line recycles carbon dioxide-depleted flue gas to the fuel cell unit.

The invention relates to an apparatus for separating a gas mixture containing CO2 and at least one component that is lighter than CO2, which comprises a separation unit (CC) for separation by partial condensation and / or distillation at a temperature lower than 0°C of the gas mixture (MG), generating a CO2-enriched fluid (P) and a first waste gas (PGR) depleted in CO2 which is substantially at the same pressure as the gas mixture and an apparatus for separation by pressure swing adsorption (CO2 PSA) of the first waste gas, producing a first CO2-enriched gas (GE) at a first pressure and a second waste gas (DGR) depleted in CO2 at a second pressure higher than the first pressure, a turbine (T1) and a pipe for sending the first waste gas (PGR) to expand in the turbine (T1) downstream of the separation unit (CC) and upstream of the apparatus for separation by pressure swing adsorption (CO2 PSA).

A method of treating an aqueous solution, where the method includes separating H2S from the aqueous solution, generating a gas stream including the H2S, flowing the gas stream into a plasma reactor, igniting a plasma in the plasma reactor including the gas stream, decomposing the H2S to generate H2 and elemental sulfur in the plasma generating a product gas stream including the H2, and condensing the elemental sulfur from the product gas stream as a liquid.

A hydrocarbon stream is combusted within a reactor to produce soot and syngas. Sub-stoichiometric combustion of the hydrocarbon stream within the reactor converts at least 10% of the carbon in the hydrocarbon stream into soot. The syngas is mixed with a steam stream to produce a hydrogenation feed stream. A shift reactor converts at least a portion of the carbon monoxide and steam to carbon dioxide and hydrogen to produce a shifted gas stream. Water is separated from the shifted gas stream to produce a dehydrated gas stream. The dehydrated gas stream is separated to produce a hydrogen product stream and a recycle stream. The recycle stream is recycled to the reactor.

The application provides a hydrogen deep removal and moisture removal method. High-concentration raw gas is dynamically mixed with dry low-concentration reflux gas in a mixer to form mixed gas, so as to reduce the hydrogen content and reduce the reaction risk. After pressurized heating, oxygen with a precisely matched hydrogen concentration is injected into a reactor for reaction. The reactor is provided with an alternating fixed and rotatable cylinder, and the inner wall of the flow channel is coated with a catalyst; the corresponding cylinder speed is automatically adjusted based on real-time hydrogen concentration detection downstream, and the speed is accelerated when the concentration exceeds the standard to strengthen turbulent contact and prolong the reaction time, combined with the concentration threshold setting decreasing along the flow direction, so that the hydrogen is deeply removed to an ultralow level. The reaction generates moisture, most of which is separated by two-stage water cooling, and then is deeply adsorbed and dried to be completely removed to an ultralow content. Finally, the gas is divided into two parts, one part is output as product gas, and the other part is completely dried reflux gas which is recycled to the initial mixing step to reduce the reaction risk of high hydrogen content.

A process for producing hydrogen from a syngas stream is provided in which carbon dioxide is removed from the syngas stream by absorption. After carbon dioxide has been desorbed from the absorption medium, the absorption medium present in the resulting carbon dioxide stream is removed by adsorption on the solid adsorbent, for example due to the molecular sieve effect. A portion of the thus obtained carbon dioxide stream now free of the absorbing medium is heated and used to regenerate the loaded solid adsorbent. The invention further provides a device for carrying out the method according to the invention.

This invention belongs to the field of hydrogen production technology, specifically relating to a method and application of hydrogen production via an oxygen-permeable membrane. The method includes the following steps: (1) introducing water vapor into a second oxygen-permeable membrane reactor R2 to generate a high-temperature reactive gas 1; (2) mixing the remaining hydrogen-containing gas on the water vapor side of the second oxygen-permeable membrane reactor R2 with the high-temperature reactive gas 1 and introducing it into a first oxygen-permeable membrane reactor R1; (3) introducing water vapor into the first oxygen-permeable membrane reactor R1, where oxygen migrates through the oxygen-permeable membrane to the oxygen side and reacts with the mixed gas 1 to generate a high-temperature reactive gas 2; (4) introducing a portion of the high-temperature reactive gas 2 as a circulating gas into the second oxygen-permeable membrane reactor R2 and mixing it with fuel; (5) introducing the remaining hydrogen-rich gas on the water vapor side of the first oxygen-permeable membrane reactor R1 into a first condenser C1 to obtain high-purity hydrogen. This invention further reduces energy consumption while increasing the production rate, providing a convenient, efficient, and economical way to produce hydrogen.

A method comprising partially condensing and separating a feed stream comprising helium and hydrogen to produce a first medium-pressure vapor stream and a first medium-pressure liquid stream; reducing the pressure of the first medium-pressure liquid stream or a stream derived from the first medium-pressure liquid stream to produce a low-pressure vapor stream and a low-pressure liquid stream; cooling the first medium-pressure vapor stream by indirect heat exchange against the low-pressure liquid stream to produce a first partially condensed medium-pressure stream; and separating the first partially condensed medium-pressure stream to produce a second medium-pressure vapor stream and a second medium-pressure liquid stream.

There are provided systems and methods for using fuel rich partial oxidation to produce an end product from waste gases, such as flare gas. Lambda sensor modifications and other control parameters that provide closed-loop mixture control at extremely fuel-rich operating conditions utilizing feed-forward and feedback approaches, physics-based engine models, novel use of a lambda sensor (02-based sensor), sensors with intermittent contact with the gas stream. In an embodiment the system and method use air-breathing engines having control systems, control parameters, sensors and input / output (I / O) for the fuel rich (ER of 1.2 and greater), partial oxidation of the flare gas to form syngas. In embodiments the syngas is further converted into an end product. In an embodiment the end product is methanol.

An apparatus for steam reforming includes a reactor, a condensate separator, a condensate stripper, and a steam boiler. The reactor produces hydrogen and is connected to the condensate separator such that a gas mixture is conducted from the reactor into the condensate separator. The condensate separator and the condensate stripper are connected so that condensate separated out in the condensate separator is conducted into the condensate stripper. The condensate separator and the steam boiler are connected such that cleaned condensate can be conducted into the steam boiler. The steam boiler is connected to the reactor and to the condensate stripper in a steam-conducting manner. The boiler water feed line of the steam boiler is connectable to the condensate stripper in a liquid-conducting manner. A supply from the boiler water feed line is at a same location of the condensate stripper as a supply of the condensate from the condensate separator.

A process for steam reforming a hydrocarbon feedstock containing one or more nitrogen compounds, including passing a mixture of the hydrocarbon feedstock and steam through a catalyst bed of one or more nickel steam reforming catalysts disposed within a plurality of externally heated tubes in a tubular steam reformer, each tube having an inlet to which the mixture of hydrocarbon and steam is fed, an outlet from which a reformed gas containing hydrogen, carbon monoxide, carbon dioxide, steam, ammonia and methane is recovered. The steam reforming catalyst at least at the outlet of the tubes comprises nickel dispersed over a porous metal oxide surface present as a coating on a non-porous metal or ceramic structure The nickel content of the metal oxide coating is in the range of 5 to 50% by weight and the thickness of the coating is in the range of 5 to 150 micrometres.

The present application relates to a process for producing synthetic ammonia by using hydrogen-containing tail gas, comprising the following steps: S1: sodium cyanide tail gas is pressurized, then heated and water-cooled. S2: the impurity-removed tail gas is desulfurized. S3: the desulfurized tail gas is mixed with chlor-alkali tail gas, the mixed gas is heated and deoxidized. S4: the deoxidized tail gas is pressurized and enters a PSA (pressure swing adsorption) device for pressure swing adsorption treatment, obtaining high-purity hydrogen. In the PSA device, dehydrating, carbon dioxide, methane, carbon monoxide and nitrogen adsorbents are sequentially arranged. The carbon dioxide adsorbent is activated carbon modified by carbonate and strong alkali, and the nitrogen adsorbent is 13X zeolite molecular sieve modified by Na + and Ba 2+ and Ca 2+ ion exchange. S5: nitrogen reacts with the high-purity hydrogen obtained in step S4 to generate ammonia. The present application can improve the adsorption capacity of the adsorbent for impurity gas, thereby reducing the replacement frequency of the adsorbent, prolonging the service period and service life of the adsorbent, and improving the production efficiency.

Systems and methods are provided for producing end products from hydrocarbon gases, such as flare gas, using partial oxidation. Methods and systems are provided for minimizing the compression work required for an air-breathing engine reformer in a gas-to-liquid system. Methods and systems are provided for minimizing the compression work required for an air-breathing engine reformer in a gas-to-liquid system and method by one or more of: (a) reducing the amount of nitrogen; (b) increasing the engine reformer back pressure from the standard 1 or 2 bar to up to 5 bar; (c) using a turbo expander to recover much of the compression work, thereby reducing, among other things, the cost of operating the plant; and (d) using an enhanced synthesis loop to achieve acceptable methanol synthesis at lower overall pressure. In one embodiment, the end product is methanol.

The present invention provides a method and system for purifying hydrogen used in polysilicon production, as well as a method and system for polysilicon production. The purification method includes the following steps: introducing hydrogen used in polysilicon production into boiling trichlorosilane so that the internal moisture reacts with trichlorosilane, and then making the gas phase escaping from trichlorosilane contact with the atomized trichlorosilane sprayed downwards so that the remaining water vapor in it reacts with trichlorosilane to obtain a water-removed gas phase; the water-removed gas phase is then condensed to liquefy the vaporized trichlorosilane in it, and hydrogen used in polysilicon production with impurities removed is obtained. The present invention can dry the moisture in hydrogen used in polysilicon production to less than 1 ppm without introducing external impurities.

A plant and process for producing a hydrogen rich gas are provided, said process comprising the steps of: steam reforming a hydrocarbon feed into a synthesis gas; shifting the synthesis gas and conducting the shifted gas to a hydrogen purification unit, subjecting CO2-rich off-gas from the hydrogen purification unit to a carbon dioxide removal in a low temperature CO2-removal section and recycling CO2-depleted off-gas rich in hydrogen to the process. A drying unit upstream the CO2-removal section is provided, under the addition of regeneration gas produced in the plant and process.

A method for producing hydrogen from biomass. For this purpose, the biomass is fed into a fluidized bed reactor, in which the biomass is converted into a flow of products. Solid particles are separated in at least one cyclone. Further solid particles and hydrocarbons are separated in a venturi scrubber. A flow of products is generated in the biodiesel scrubbing, which is fed into a water scrubbing and then to a cooling unit for separation. A flow of products is generated in the high-purification of gas, which is fed into a water gas conversion and CO2 removal. A flow of products is generated in the gas separation.

The present disclosure relates to systems and methods useful for providing one or more chemical compounds in a substantially pure form. In particular, the systems and methods can be configured for separation of carbon dioxide from a process stream, such as a process stream in a hydrogen production system. As such, the present disclosure can provide systems and method for production of hydrogen and / or carbon dioxide.