106results about "Methane capture" patented technology

The invention relates to a preparation method of a normal-temperature normal-pressure efficient gas adsorption composite material. The method comprises the following steps: firstly, pretreating activated carbon to obtain surface-OH modified mesoporous activated carbon; then modifying the surface-OH modified mesoporous activated carbon with the ZIF-8 material to obtain ZIF-8 (at) OH-AC; and finally, performing surface hydrophobization modification to obtain the adsorption material. Wherein in the modification process, ZIF-8 is firmly loaded and uniformly distributed on the surface of hydroxyl-modified mesoporous activated carbon by adopting an in-situ growth technology, the interface bonding force is enhanced, the loading capacity of the activated carbon on the MOFs material is improved, and by utilizing the chemical adsorption effect of ZIF-8 Zn < 2 + > and methane and the high porosity of the mesoporous activated carbon, the MOFs material can be prepared. The adsorption capacity of the composite material to methane is greatly improved, meanwhile, the moisture resistance of the composite material is effectively improved, the composite material can still keep stable and efficient adsorption performance in a high-humidity environment, and the problem that an existing material is prone to inactivation in a humid environment is solved.

Disclose is a separator for separating liquid from a fluid stream including a mixture of gas and liquid. The separator comprises a first vessel including an outlet and an inlet for receiving the fluid stream, the first vessel in fluid communication with a second vessel via a first valve, the second vessel in fluid communication with a liquid outlet via a second valve, wherein the first vessel is arranged to enable the liquid to flow into the second vessel. The separator also has a second valve for controlling release of liquid from the second vessel, the first and second valves being pneumatically operated, the pneumatic operation of the first and second valves allowing only one of the first and second valves to be open during operation of the separator.

The application discloses a preparation method of a carbon molecular sieve adsorbent for methane-nitrogen separation. The method comprises the following steps: 1) grinding graphite powder and placing the same in a metal salt solution, drying after sufficient stirring to obtain modified graphite; 2) placing phenolic resin powder in a metal salt solution, drying after sufficient stirring to obtain modified resin; 3) mixing the modified graphite and the modified resin, adding tar into the mixture, kneading and then extruding into a strip shape; 4) sufficiently drying the formed material, then transferring the material into a gas atmosphere calcination furnace, and calcining the material under an inert gas atmosphere for a certain time; and 5) performing programmed temperature heating on the obtained material under an inert gas atmosphere, introducing a carbon source, and depositing pyrolytic carbon on the surface of the material by a gas phase deposition method to obtain a carbon molecular sieve adsorption material. The carbon molecular sieve material is used as an adsorbent by adopting a pressure swing adsorption technology, has high adsorption capacity for nitrogen and high methane-nitrogen selectivity in methane-nitrogen separation application, and has a good industrial application prospect.

The invention belongs to the technical field of gas separation, and particularly relates to application of a tetramethylammonium-modified EMT zeolite molecular sieve in CH4 / N2 adsorption separation. According to the invention, tetramethylammonium ions (TMA < + >) are introduced into the zeolite molecular sieve EMT, so that the EMT which has no performance originally shows efficient CH4 / N2 separation performance. Due to the introduction of TMA, the SBET value of the EMT molecular sieve is obviously reduced compared with that of the original EMT molecular sieve, but the adsorption capacity of methane is increased. Due to the introduction of TMA, the interaction affinity of CH4 and a zeolite framework is enhanced. Under the conditions that the K is 298 K, the pressure is 1 bar and the pressure is 10 bar, the EMT-TMA shows relatively high CH4 / N2 selectivity of 5.43 and 7.48.

The invention provides an inorganic membrane for extracting helium as well as a preparation method and application of the inorganic membrane. The inorganic membrane comprises a molecular sieve membrane and a protective coating, the molecular sieve membrane comprises a carrier and a molecular sieve layer, the protective coating is located on the surface of the side, away from the carrier, of the molecular sieve layer, and the protective coating comprises beta-cyclodextrin and / or polydimethylsiloxane. The inorganic membrane for helium extraction comprises the molecular sieve membrane and the protective coating, the protective coating comprises beta-cyclodextrin and / or polydimethylsiloxane, and due to the existence of the protective coating, the separation selectivity of the inorganic membrane on helium in mixed gas containing helium and methane can be high.

The application relates to the technical field of gas filtering materials, in particular to a polyimide film composite material and a preparation method and application thereof, the composite material is mainly made of polyimide and Zn / g-C3N4, Zn / g-C3N4 accounts for 10-20 wt% of the mass of the polyimide; the preparation method is that the polyimide is stirred in a solvent to obtain a polyimide casting solution, then Zn / g-C3N4 is poured into the polyimide casting solution, stirring is carried out at 60-80 DEG C for 8-12 h, cooling is carried out to room temperature for 1-4 h, the defoaming casting solution is poured on a glass plate, a film with a thickness of 50-80 mu m is scraped out by using a coating machine, the scraped film is dried under vacuum at 100-120 DEG C for 8-12 h, peeling is carried out, annealing is carried out at 200-230 DEG C for 8-12 h, the obtained Zn / g-C3N4 composite polyimide film is placed in a plasma reactor for plasma treatment, and the polyimide film composite material is obtained. The polyimide film composite material can be used for efficient purification of helium, high selectivity is achieved while high flux is met, and high stability is also achieved.

There is described a methane oxidation device for oxidation of methane from a digestive cavity associated with an animal, the device comprising a methane oxidation unit for oxidising methane; wherein the methane oxidation unit comprises an inlet portion in fluid communication with the external environment, the inlet portion further configured to be mounted to a hollow member in fluid communication with a digestive cavity associated with an animal, and further when the methane oxidation unit comprises an outlet portion in fluid communication with the external environment, so that methane from a digestive cavity associated with an animal is oxidised in the oxidisation unit prior to release into the external environment. There is further described an installation gun for installing a methane oxidation device.

A processing facility is provided that includes a feedstock separation system configured to separate a feed stream into a light stream and a heavy stream, a hydrogen production system configured to produce hydrogen and carbon dioxide from the light stream, and a carbon dioxide conversion system configured to produce synthetic hydrocarbons or carbon dioxide. The processing facility also includes a hydrotreating system configured to process the heavy stream, and a hydrotreater separation system configured to separate the hydrotreating system effluent into a separator tops stream and a separator bottoms stream, the separator bottoms stream being fed to the hydrogen production system.

Disclosed is a greenhouse gas reduction device combining EGR and iCER for a ship, including: an exhaust gas receiver 110 temporarily storing exhaust gas discharged from each cylinder of a ship engine 10 and removing pulsation; a supercharger 120 compressing and supplying combustion air by means of exhaust gas supplied from the exhaust gas receiver 110; a washing section 130 spraying washing water to exhaust gas supplied through the supercharger 120, washing and removing SO X and soot, and circulating coolant to cool exhaust gas; a CO2 absorbing section 140 spraying absorbing liquid to exhaust gas passing through the washing section 130 to absorb and remove CO2; a combustion air receiver 150 temporarily storing combustion air compressed by the supercharger 120, removing pulsation, and supplying air to each cylinder of the ship engine 10; and an exhaust gas circulation section 160 supplying exhaust gas passing through the CO2 absorbing section 140 to the supercharger 120 so as to be mixed with outside air; by combining EGR with iCER, it is possible to reduce NO X generation by means of EGR, while absorbing CO2 and SO X x and converting them into substances that do not affect the environment, prevent corrosion of the engine, improve combustion quality, improve engine efficiency by means of iCER, and reduce methane escape.

Injecting CO2 that is diluted within water, into a coal seam, which allows for the sequestering and control of downhole CO2 within connected fractures without damaging the subterranean formation.

The invention discloses a SiOC aerogel-molecular sieve composite material with a coating structure for protecting a methane gas sensor and a preparation method of the SiOC aerogel-molecular sieve composite material, the SiOC aerogel-molecular sieve composite material adopts a structural design of coating a molecular sieve with SiOC aerogel, and the inner core structure adopts a molecular sieve with micron-scale granularity and nano-scale internal pores; and the SiOC aerogel coated outside is prepared by adopting methyl trimethoxy silane and vinyl triethoxy silane as silicon sources and adopting a sol-gel method. On one hand, defects caused in the preparation process of the aerogel can be reduced as much as possible, on the other hand, interface contact between the aerogel and the molecular sieve can be effectively ensured, the specific surface area and the micropore porosity of the aerogel are further improved while the structural stability of the aerogel is ensured, and the preparation method is simple and convenient. Therefore, the SiOC aerogel and molecular sieve composite material has better gas adsorption and filtration capacity and can be stably applied to a methane gas sensor protection material.

An air conditioning and filtering system 10 is provided that includes a pre-treatment system 12 for initially filtering air drawn from an external environment, a pressurizing means 50 for pressurizing the air filtered by the pre-treatment system 12 to a positive pressure, and at least one circulation means 106. Each circulation means 106 draws air from the external environment through the pre-treatment system 12 and the pressurizing means 50, and air from at least one enclosed area 1, to combine into an air flow. The air flow is then directed to at least one set of a filtering means 94 and an air conditioning means 96 before being conveyed to at least one of the at least one enclosed area 1.

The invention discloses a method for high-selectivity separation of low-concentration coal bed gas by a hydrate method using tri-n-butylphosphine oxide as a thermodynamic accelerant. The method comprises the following steps: carrying out hydrate generation and separation on low-concentration coal bed gas in a 5 wt% tri-n-butyl phosphine oxide solution under the conditions of 277.15 K and 4 MPa, and increasing the methane concentration from 30.07 mol% to 88.17 mol% after purification; the separation performance is improved by further adding 0.5 wt% of a kinetic accelerator (preferably cocamidopropyl dimethylamine), and experimental results show that the methane concentration after single-stage separation can be improved from 30.07 mol% to 92.84 mol%, the separation factor reaches 40.93, and the system is in slurry dispersion and has no wall climbing phenomenon. The method is safe to operate, the accelerant can be recycled, and the method is suitable for efficient purification and resource utilization of methane in mixed gas such as low-concentration coal bed gas, biogas and coke-oven gas.

The application provides a detection method of methane and non-methane total hydrocarbon in gas, and relates to the technical field of gas component detection and analysis. The detection method first enriches the sample gas to be detected by using an enrichment tube, then sequentially performs first desorption and second desorption, separates methane and non-methane total hydrocarbon from the enrichment tube, and then respectively detects the content of methane and non-methane total hydrocarbon; wherein the elution volume of the first desorption is greater than the elution volume of methane under the same desorption temperature and filler mass conditions, and is less than the elution volume of ethane under the same desorption temperature and filler mass conditions. The application can realize the measurement of methane and non-methane total hydrocarbon by using only one enrichment tube and one sampling cycle through the secondary desorption mode, and effectively avoids the loss of low-carbon hydrocarbon such as ethane in the separation process compared with the existing method for measuring methane and non-methane total hydrocarbon by using a PQ column and a methane quantitative ring.

The application discloses a method for adsorbing and separating He / N2 / CH4 mixed gas and relates to the technical field of gas separation. The adsorbing and separating method provided by the application adopts a triple reflux variable pressure adsorption process to separate the three-component gas of He / N2 / CH4 mixed gas, high-purity three kinds of product gas are obtained by reasonably setting a process time sequence and filling specific adsorbents in different bed layers, and the recovery rate is excellent. In the obtained three kinds of product gas, the purity of methane is 75-81%, the recovery rate is 80-92%, the purity of nitrogen is 90-96%, the recovery rate is 80-92%, and the purity of helium is 75-93%, and the recovery rate is 75-84%.

The invention discloses a metal organic framework material for adsorbing and separating methane and nitrogen in wharf oil gas as well as a preparation method and application of the metal organic framework material. The metal organic framework material is a modified Al-fumarate material which is obtained by performing organic liquid post-treatment on a framework material formed by complexing an aluminum metal node and fumaric acid. According to the method for modifying the Al-fumarate metal organic framework material based on organic matter aftertreatment, Al-fumarate material basic powder is prepared through a simple hydrothermal process, pretreatment is performed through vacuum high-temperature degassing, then aftertreatment modification is performed through organic liquid, and the high-performance methane nitrogen adsorption and separation material is prepared. And optimization of methane adsorption capacity and methane nitrogen selectivity is realized. The material can be applied to methane adsorption and recovery in the wharf oil gas treatment process, has the technical advantages of simple preparation conditions, easily available raw materials and excellent adsorption performance, and overcomes the bottleneck of the existing material in methane adsorption.

An apparatus and method are provided for reducing methane emissions from ruminant animals by combusting methane gas extracted from the rumen. The system comprises a conduit configured to transport methane from the animal's rumen to a combustion module mounted externally or implanted partially or fully in a subdorsal position. The combustion module includes a pressure-activated valve, air intake, ignition system, and combustion chamber enclosed by a heat-absorbing roof structure. A control unit monitors internal gas pressure and triggers a spark ignition circuit when combustion conditions are satisfied. An upward-facing camera inhibits ignition if flammable obstructions are detected above the module. A water-filled thermal buffer integrated into the chamber roof moderates exhaust temperature, reducing wildfire risk. Power is supplied by a solar panel and rechargeable battery. The system intermittently converts methane into carbon dioxide and water vapor, significantly mitigating the greenhouse gas impact of enteric fermentation in ruminant livestock.

A system for removing methane oxidation catalyst (MOC) poisons from an exhaust gas includes a methane abatement unit capable of receiving an exhaust gas containing methane (CH4) and MOC poisons. The methane abatement unit includes a guard bed capable of removing MOC poisons from the exhaust gas and generating an intermediate exhaust gas containing CH4 and free of MOC poisons. The guard bed includes an MOC poison capture component having a first transition metal oxide, an aluminum oxide (Al2O3) support material, and a dolomite-derived support material. The methane abatement unit also includes an MOC bed fluidly coupled to and positioned downstream of the guard bed. The MOC bed includes MOC and is capable of removing CH4 from the intermediate exhaust gas to generate a treated exhaust gas having less than about 200 parts per million by volume (ppmv) of CH4.

The invention relates to the technical field of gas separation membranes, in particular to a cross-linked BPDA-based polyimide separation membrane for extracting helium from natural gas, which is prepared by copolymerizing diamine with TPEQ and BPDA, carrying out thermal crosslinking to synthesize a plurality of cross-linked polyimides, carrying out imidization treatment to prepare a membrane casting solution, and carrying out vacuum drying on the membrane casting solution to obtain the cross-linked BPDA-based polyimide separation membrane for extracting helium from natural gas. The crosslinking type polyimide separation membrane for extracting helium from natural gas is prepared through the prepared membrane casting solution, adopted diamine comprises DABA, ppd and ODA, and three polyimide materials with different polarities and crosslinking densities are synthesized by precisely regulating and controlling the chemical structure and network form of crosslinking type polyimide. Preferential permeation of He is promoted by optimizing the structural advantages of diamine; in this way, the technical problems that in the prior art, a separation membrane material is difficult to meet the requirements of high permeation flux and high selectivity at the same time, and the stability is insufficient under complex working conditions are solved.

The invention discloses a silicon-boron-carbon-nitrogen gel-reduced graphene-zeolite three-dimensional structure composite material as well as a preparation method and application thereof.The structural design that reduced graphene oxide is used for modifying SiBCN aerogel and a molecular sieve is compounded is adopted, and assembly of the SiBCN aerogel is promoted and assisted through the powerful self-assembly capacity of rGO; the rGO is filled in macroporous structures of the SiBCN aerogel to relieve collapse of pores and reduce the number of the macroporous structures, and meanwhile, a carbon-rich phase and a graphene phase generated in situ during preparation of the SiBCN aerogel are beneficial to adsorption and filtration of interference gas. By controlling the heat treatment system, the prepared composite material has a more stable three-dimensional pore structure, can be applied to various complex gas monitoring environments, is beneficial to stable work of a combustible gas sensor, and is not influenced by various interference gases.

The invention belongs to the technical field of separation membrane preparation, and provides a method for preparing a polyimide gas separation membrane through in-situ fluorination, and the method comprises the steps of preparation of polyamide acid, imidization of polyamide acid, in-situ fluorination of polyimide and preparation of the polyimide gas separation membrane, the air pressure is 1-6 bar, and the fluorinated gas is introduced for 0-30 min. According to the invention, nitrogen and fluorine are introduced after imidization of polyamide acid, and the temperature, air pressure and introduction time of the reaction kettle are controlled, so that the fluorination degree of polyimide is more effectively improved compared with the traditional way of introducing a fluorinated group by synthesizing polyimide with a fluorine-containing monomer; compared with the mode of purely introducing the fluorinated gas into the reaction kettle, the mode of introducing the fluorinated gas into the solution from the bottom of the reaction kettle has the advantages that the fluorination efficiency is higher, the fluorination degree is deeper, the overall operation is simple and feasible, the cost is favorably reduced, and the method is suitable for large-scale popularization.

The invention belongs to the technical field of gas separation and purification, and particularly relates to a preparation method of a coal carbolic oil-based adsorption material and a coal carbolic oil-based carbon adsorption material. The preparation method comprises the following steps: extracting phenolic substances in coal carbolic oil serving as a raw material by using a KOH solution, then adding aldehyde substances to polymerize, and then carbonizing a polymer at high temperature to prepare the porous adsorption material. According to the method, phenolic substances can be obtained without acid liquid replacement, generation of waste acid and waste salt is reduced, meanwhile, KOH can serve as a basic catalyst to catalyze polymerization of the phenolic substances and aldehyde substances and can also serve as a pore forming agent, and therefore the porous adsorption material generated after high-temperature carbonization is moderate in pore and concentrated in pore distribution. According to the method disclosed by the invention, carbolic oil extraction, polymer synthesis and high-temperature carbonization are coupled into a whole, so that the use of an alkaline agent is effectively reduced, and the prepared adsorption material is high in methane selectivity and large in adsorption capacity.

A biogas collection and purification system that includes a plurality of sources of biogas and a network of conduits configured to convey the biogas from the sources to a central processing facility for processing the biogas into methane. The central processing facility removes impurities to convert biogas to biomethane and may include an H2S removal stage; an activated carbon scrubber; a gas drier; and a carbon dioxide removal stage. The facility also has a biomethane gas compressor configured to deliver the biomethane for use in power plants, for CNG production. Ancillaries to the system include fuel cells for direct electricity generation from biogas / biomethane.

The invention relates to a monolithic catalyst based on an organic metal framework (MOF) derived structure and a preparation method and application thereof, and relates to the technical field of catalysts, the catalyst is composed of carrier foamed nickel (NF) and transition metal (Ni, Co), the preparation method comprises the following steps: adding a certain amount of nickel nitrate, cobalt nitrate, 2-methylimidazole and pretreated NF into a reaction kettle together for hydrothermal reaction, and calcining to obtain the modified integral foam nickel catalyst prepared by deriving bimetallic MOF, and the modified integral foam nickel catalyst has excellent catalytic activity, extremely strong stability and relatively strong water poisoning resistance. The preparation method is low in cost, easy and convenient to operate, excellent in effect, high in repeatability and suitable for industrial application with the complex environment.

Method for the aftertreatment of the exhaust gas of an internal combustion engine (1) burning a gaseous fuel, namely a gas engine or a dual-fuel engine which can be operated in a gas fuel operating mode, wherein the exhaust gas is passed over a CH4 oxidation catalyst (7) and over an SCR reduction catalyst (8), which are designed as separate catalysts, wherein the CH4 oxidation catalyst (7) for CH4 oxidation and thus as an active compound comprises at least one pyrochlore, wherein the at least one pyrochlore is selected from the following group: Sm2Zr2O7, Sm2Mo2O7, La2Ti2O7, La2Co x Sn 2-x O 7-δ , La2Co x Zr 2-x O 7-δ , Mn2Co x Zr 2-x O 7-δ , Pr2Ru2O7, ZrTiGd2O7, Pr2Co2O7 and Pr2Co x Zr 2-x O 7-δ , where 0 ≤ δ ≤ 2 and where 0 ≤ x ≤ 1, wherein NH3 or an NH3 precursor substance is introduced into the exhaust gas upstream of the CH4 oxidation catalyst (7) as a reducing agent for the SCR reduction catalyst (8).

A biogas collection and purification system that includes a plurality of sources of biogas and a network of conduits configured to convey the biogas from the sources to a central processing facility for processing the biogas into methane. The central processing facility removes impurities to convert biogas to biomethane and may include an H2S removal stage; an activated carbon scrubber; a gas drier; and a carbon dioxide removal stage. The facility also has a biomethane gas compressor configured to deliver the biomethane for use in power plants, for CNG production. Ancillaries to the system include fuel cells for direct electricity generation from biogas / biomethane.

The invention discloses a helium purification method based on multistage membrane separation, and belongs to the field of gas purification, and the helium purification method comprises the following steps: S1, raw material gas pretreatment: carrying out primary treatment on helium-containing raw material gas to remove large solid particle impurities, water and oil stains in the helium-containing raw material gas; s2, primary membrane separation, to be more specific, pressurizing the pretreated raw material gas, and feeding the pressurized raw material gas to a primary membrane separation component which adopts a helium selective separation membrane to obtain helium-rich primary permeable gas and helium-poor primary tail gas mainly containing nitrogen and methane; and S3, secondary membrane separation: pressurizing the permeated gas obtained by the primary membrane separation again, and feeding the pressurized permeated gas to a secondary membrane assembly, wherein the secondary membrane assembly adopts a fluorine-containing polymer membrane. According to the helium purification method based on multistage membrane separation, efficient purification of helium is achieved, the helium purity and separation efficiency are remarkably improved, meanwhile, different raw material gas working conditions are adapted by means of flexible stage adjustment and diversified pretreatment assemblies, and high reliability and economical efficiency are achieved.

The invention provides a silver modified AFX molecular sieve as well as a preparation method and application thereof, and relates to the technical field of molecular sieves. The method comprises the following steps: mixing an AFX molecular sieve with an AgNO3 solution, and carrying out ion exchange to obtain the silver-modified AFX molecular sieve. Silver ions with electronegativity are introduced into AFX molecular sieve pores through ion exchange, and the CH4 / N2 selectivity is improved by utilizing the polarizability difference of CH4 and N2. The prepared silver modified AFX molecular sieve is applied to adsorption separation of methane and nitrogen, and has high separation selectivity on methane and nitrogen and high methane adsorption capacity in a low-pressure area. The result of the embodiment shows that the prepared silver-modified AFX molecular sieve shows excellent methane capture capability in a low-pressure area (the adsorption capacity of 0.2 bar can reach 15 cm < 3 >. G <-1 > or above), and shows excellent separation performance (the IAST selectivity is greater than 6 and can reach 25 or above) when the methane / nitrogen gas composition is 20 / 80.

The invention relates to the technical field of methane catalytic oxidation, in particular to a methane-poor gas catalyst and a preparation method and application thereof.The preparation method comprises the steps that S1, nickel salt, ferric salt, chromium salt and water are mixed, and a mixed solution is obtained; s2, mixing the mixed solution, a precipitant and water, stirring, co-precipitating, aging and drying to obtain an aged product; and S3, calcining the aged product in a mixed atmosphere to obtain the methane-poor gas catalyst. The methane-poor gas catalyst obtained by the preparation method disclosed by the invention can realize 50% of methane conversion rate at 250 DEG C and 90% of conversion rate at 410 DEG C under the condition of not containing noble metal, and has excellent low-temperature catalytic activity. For the methane-poor gas with the volume concentration smaller than 1%, the activity is high in the low-temperature section (150-550 DEG C), the methane removal rate is high, and almost all the gas is converted into CO2 with the relatively low greenhouse effect after the reaction.

System to control a biogas collection plant (1) having a manifold (18) and a plurality of collection units (2) connecting respective capturing wells to the manifold (18) and having respective biogas flow rate regulation valves (17); the system having a control board (38) with a pressure sensor (39), a methane sensor (40), an oxygen sensor (41), a biogas pressure monitoring network (43) connecting the pressure sensor (39) to the collection units (2) by means of respective control valves (49), and a chemical biogas monitoring network (51) connecting the methane sensor (40) and the oxygen sensor (41) to the collection units (2) by means of as many control valves (54); the control board (38) selectively controlling the control valves (49, 54) to measure pressure (Pa), methane concentration (CH4) and oxygen concentration (02) of the biogas in the collection units (2) and controlling the regulation valves (17) as a function of the pressure (Pa) and methane and oxygen concentration (CH4, 02) values measured.