441 results about "Adsorption separation" patented technology

The invention relates to the technical field of methanol resource utilization, and discloses a system for preparing methanol based on SOEC-CH4 electrolysis, which is characterized in that a cathode subsystem main body reacts to generate water vapor and H2 mixed gas, the water vapor and H2 mixed gas are condensed and separated to obtain H2, and most of H2 is conveyed to an H2 storage buffer tank and stored; the anode subsystem for preparing CO2 comprises a CH4 tank, an anode subsystem main body and an electrolytic bath anode of an SOEC electrolytic bath which are communicated in sequence, and the anode subsystem main body reacts to generate water vapor, CH4 and CO2 mixed gas; the mixed gas of the water vapor, CH4 and CO2 is subjected to condensation and adsorption separation to obtain CO2, and most of CO2 is conveyed to a CO2 storage buffer tank to be stored; and the methanol preparation subsystem reacts to obtain methanol. According to the system for preparing methanol through electrolysis, methane is introduced to prepare carbon dioxide, the technical problems of high energy consumption and low comprehensive utilization rate of waste heat and wastewater are solved, and cost is greatly reduced to prepare methanol.

The invention provides a method for recovering platinum group metal from a waste automobile exhaust purification catalyst, and belongs to the field of precious metal recovery. The method comprises the following steps: carrying out crushing and impurity removal pretreatment on the waste catalyst to obtain solid residues; mixing the obtained solid slag with alkali liquor, and performing hot-pressing activation to obtain active slag; leaching the active slag by using an acid leaching system of hydrochloric acid-hydrogen peroxide-sodium chloride to obtain a leaching solution enriched with platinum group metals; adjusting the acidity of the leachate, adding a first adsorption material, selectively adsorbing platinum and palladium, and separating supernate and a platinum / palladium enrichment material; adjusting the acidity of the supernate, adding a second adsorption material, selectively adsorbing rhodium, carrying out solid-liquid separation, and collecting a rhodium enrichment material; respectively eluting and refining the platinum / palladium enrichment material and the rhodium enrichment material, and recovering platinum, palladium and rhodium; through the optimally designed recovery method of alkaline hot-pressing activation-mild acidic directional leaching-two-stage magnetic adsorption separation, efficient recovery of platinum, palladium and rhodium in the waste automobile exhaust catalyst is realized.

The invention provides a crown ether functionalized covalent organic framework material and a preparation method and application thereof, the crown ether functionalized covalent organic framework material has a structure as shown in a general formula A. Benzocrown ether functional groups are introduced into the structure of the covalent organic framework material through a bottom-to-top method for adsorption separation of lithium ions; and the lithium adsorption capacity is good.

The invention relates to the technical field of rare earth element separation methods, in particular to a method for separating ytterbium and lutetium by using a phosphate adsorbent, which comprises the following steps: loading a phosphate solution on a porous solid-phase carrier by using a vacuum impregnation method, and carrying out reduced pressure evaporation and drying to obtain a phosphate solid adsorbent; filling an exchange column with the solid adsorbent to obtain the exchange column filled with the solid adsorbent; enabling a nitric acid solution containing ytterbium and lutetium to flow through an exchange column filled with a solid adsorbent to complete a column adsorption process; and performing elution, performing desorption by using a desorption solution to obtain the regenerated exchange column filled with the solid adsorbent, respectively collecting the ytterbium solution and the lutetium solution, completing the separation process, and repeating the steps. By adopting the steps, the separation of ytterbium and lutetium is directly realized from the nitric acid solution containing ytterbium Yb and lutetium Lu through column adsorption separation, leaching and desorption processes, and high-purity ytterbium and lutetium products are prepared.

The invention discloses a carboxyl-functionalized porous organic polymer, a preparation method thereof and application of the carboxyl-functionalized porous organic polymer in ammonia gas adsorption separation and sensing. The polymer is obtained by free radical polymerization, hydrolysis and acidification of monomers containing vinyl and ester groups, and has a mesoporous structure and a skeleton carboxyl functional group. The preparation method is simple and mild in condition. The polymer has excellent adsorption selectivity and high adsorption capacity on ammonia gas, the static adsorption capacity on the ammonia gas under the conditions of 298 K and 1 bar is not lower than 6.5 mmol / g, the ammonia gas can be efficiently separated from NH / N / H and NH / COs mixed gas, and the cycling stability is good. An ammonia gas sensor prepared by taking the graphene oxide as a sensitive material has linear or piecewise linear response to ammonia gas with the concentration of 1-100 ppm at room temperature, the detection limit is lower than 30 ppb, and the selectivity is excellent. The invention overcomes the defects of the existing ammonia gas adsorption separation material and sensor, has important significance for optimizing the ammonia production process and reducing pollution, and has wide application prospects.

The invention discloses a preparation method and application of a metal covalent organic framework material, and the prepared metal covalent organic framework material can be used for adsorption separation of elemental iodine pollutants and shows excellent iodine adsorption capacity and rate. According to the preparation method, 1H-pyrazole-4-formaldehyde and copper nitrate trihydrate are subjected to a solvothermal reaction to prepare a copper ion ring trinuclear metal complex with an aldehyde group, and the copper ion ring trinuclear metal complex and 1, 3, 5-tri (4-aminophenyl) benzene are further subjected to a Schiff base reaction to prepare the metal covalent organic framework material containing copper ions. According to the metal covalent organic framework material disclosed by the invention, copper ion active adsorption sites in a chemical structure are also retained while a developed microporous structure is maintained, and the interaction strength of pore channels to iodine is remarkably enhanced, so that the iodine adsorption rate and capacity are remarkably improved. The preparation method is simple, convenient, universal and high in controllability, and large-scale production and manufacturing of the metal covalent organic framework adsorption material can be achieved.

The present invention relates to the technical field of polymer preparation. Disclosed are a covalent organic framework material, and a preparation method therefor and a use thereof. The preparation method for the covalent organic framework material comprises the following step: subjecting an organic aldehyde and an organic amine to a condensation reaction in a deep eutectic solvent to obtain the covalent organic framework material, wherein the deep eutectic solvent is a two-component eutectic liquid composed of menthol and acetic acid. The temperature for the reaction is 25-120ºC, and the time for the reaction is 1-72 hours. The deep eutectic solvent composed of menthol and acetic acid used in the present invention has good dissolution properties for organic matters, and can also efficiently catalyze the condensation reaction between the organic amine and the organic aldehyde. The prepared covalent organic framework material exhibits high crystallinity and has good applications in the fields of adsorptive separation, heterogeneous catalysis, energy storage, etc. The present method has mild reaction conditions, simple operation, and good universality, is conducive to industrial large-scale production, and conforms to the concept of green chemistry.

The invention relates to an adsorbent based on an X molecular sieve and preparation and application thereof, and a preparation method of the adsorbent comprises the following steps: (1) mixing the X molecular sieve with a binder, molding and roasting to obtain a molded body; (2) treating the molded body obtained in the step (1) with an alkali solution to perform in-situ crystallization on the binder in the molded body to obtain a crystallized product; (3) carrying out partial barium ion exchange on the crystallized product obtained in the step (2) by using a barium salt solution, and drying to obtain a dried product; (4) carrying out ammonium ion exchange on the dried product obtained in the step (3) by using an ammonium salt solution, and roasting in a flowing atmosphere to obtain a roasted product; and (5) performing barium ion exchange and optional potassium ion exchange on the roasted product obtained in the step (4), and then drying to obtain the adsorbent. The adsorbent has at least two kinds of mesoporous channels with different apertures, has high barium ion exchange capacity, high adsorption capacity and compressive strength, and shows good adsorption selectivity and mass transfer performance when used for adsorption separation of p-xylene.

The invention discloses a composite membrane with adsorption separation and catalytic degradation functions as well as a preparation method and application of the composite membrane. The composite membrane is supported by a porous base membrane, a polyamide separation layer formed by reaction of a 3, 4-dihydroxyphenylethylamine and 2, 3-diaminophenol comonomer and acyl chloride is constructed on the surface of the porous base membrane through interfacial polymerization, and FeCo-g-C3N4 nanosheets are anchored in situ; the membrane can efficiently activate peroxymonosulfate (PMS) to generate free radicals under the nearly neutral condition, efficient interception and catalytic degradation of organic pollutants (such as antibiotics) are synchronously achieved, and heavy metal ions (such as Pb < 2 + > and Cd < 2 + >) are adsorbed through a functional monomer structure; the invention provides an interfacial polymerization preparation method of the membrane. The composite membrane breaks through the limitation of'only interception but not degradation 'of a traditional membrane, realizes integration of'separation-adsorption-degradation', can remarkably reduce the volume of concentrated water and reduce the toxicity of the concentrated water, and is suitable for advanced treatment of wastewater containing composite pollutants in the industries of pharmacy, printing and dyeing and the like.

The invention relates to the technical field of separation, and discloses a molecular sieve separation system for medical oxygen production, which comprises an adsorption separation group, a fluid control valve group, a pressure monitoring unit and a self-adaptive control center, the self-adaptive control center executes capacity locking logic and regeneration clamping logic based on fluid impedance fingerprint characteristics, monitoring the actual pressurizing duration of the adsorption pressurizing stage in real time, calculating a deviation value between the actual pressurizing duration and the reference adsorption duration, and generating a primary switching instruction; meanwhile, the real-time residual desorption pressure of the other adsorption bed layer is obtained and compared with a regeneration end point pressure threshold value, a final step sequence switching instruction is output when the conditions are met, and self-adaptive locking of the real adsorption capacity of the molecular sieve is achieved by recognizing the adsorption capacity saturation characteristics and decoupling gas source fluctuation.

The invention discloses a photo-thermal carbon dioxide adsorbent as well as a preparation method and application thereof. The photo-thermal carbon dioxide adsorbent is green in production process and wide in raw material source, chitosan which is high in natural abundance and low in price is directly used as a raw material, and the energy consumption in the preparation process is effectively reduced through a composite pore-forming strategy that an activating agent, a pore-forming agent and a nitrogen source are introduced through a one-pot method. The photo-thermal carbon dioxide adsorbent provided by the invention can realize direct carbon capture in normal-temperature air or adsorption separation of CO2 in flue gas, and then realizes zero-carbon desorption under sunlight irradiation, thereby providing a new idea for capture, utilization and storage of carbon dioxide.

The invention discloses an adsorbent material for removing perfluorinated and polyfluoroalkyl substances in water and a preparation method thereof, and belongs to the technical field of adsorption separation. The preparation method of the adsorbent material for removing perfluorinated and polyfluorinated alkyl substances in water comprises the following five steps: preparing melamine cyanurate in-situ coated lignin, preparing a precursor, carbonizing, activating with water vapor, and performing hydrothermal secondary activation. The specific surface area of the adsorbent material for removing perfluorinated and polyfluoroalkyl substances in water is 1109-1205m < 2 > / g, the average pore size is 24.2-30.7 nm, and the saturated adsorption capacities of the adsorbent material for PFOS, PFOA and PFBA are respectively 158-183mg / g, 163-177mg / g and 161-170mg / g.

The invention belongs to the field of heavy metal adsorption separation and solid adsorbents, and provides a dendritic polyethyleneimine surface modified GO / MXene nano adsorbent as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing a graphene oxide dispersion liquid with a Ti3C2Tx colloidal solution, and carrying out dispersion treatment to obtain a GO-Ti3C2Tx mixed solution with a certain concentration; adding dendritic polyethyleneimine, and carrying out covalent modification and electrostatic assembly strategy reaction to obtain a dendritic polyethyleneimine modified GO / MXene reaction solution; and centrifuging, washing and drying to obtain the dendritic polyethyleneimine surface modified GO / MXene adsorbent. According to the invention, the nitrogen-rich cationic polymer is introduced, so that the adsorption capacity of graphene oxide to Cr (VI) is improved; the preparation process is simple, green and environment-friendly; the obtained adsorbent can efficiently remove Cr (VI) in a water body, and has a good adsorption effect on Cr (VI).

The invention provides a method for preparing a ceramic material from lithium slag obtained by extracting lithium through a spodumene acid method, and relates to the technical field of energy conservation and environmental protection. The method for preparing the ceramic material by extracting the lithium slag through the spodumene acid method comprises the following steps: S1, component analysis: carrying out comprehensive component analysis on the lithium slag; s2, magnetic separation iron removal: enabling the lithium slag to pass through a magnetic field by using a magnetic separator, so that magnetic iron impurities in the lithium slag are adsorbed and separated; s3, particle size adjustment is conducted, and mechanical equipment is adopted for conducting particle size grading and grinding treatment on the lithium slag; step S4, mixing and ball-milling: according to a preset formula proportion, adding the lithium slag, kaolin, feldspar, quartz and an additive into a ball mill in proportion, adding a proper amount of water, and carrying out ball-milling and mixing for 2-4 hours, so that the raw materials are fully and uniformly mixed to obtain uniform ceramic blank slurry; finally, the problems that the lithium slag is difficult to treat, the requirement for ceramic materials is large, the preparation cost is high and the performance needs to be improved are solved, and energy-saving and environment-friendly treatment and resource recycling of lithium slag resources are achieved.

The invention discloses an indium-based metal-organic framework material based on a pyridine hexacarboxylic acid ligand as well as a preparation method and application of the indium-based metal-organic framework material, the chemical formula is {[NH2Me2] 2 [In4 (mu2-O) (H6L) 2 (H2O) 2]. 3DMF. 10H2O} n, and H6L is an organic ligand 4, 4 ', 4' '-(pyridine-2, 4, 6-triyl) triisophthalic acid. The material has excellent thermal stability and chemical stability, and due to the frame charge characteristic and the excellent pore structure of the material, the metal organic frame material shows efficient dye selective adsorption and separation performance, can selectively adsorb cationic dye methylene blue MB and repel anionic dye methyl orange MO at the same time. In conclusion, a new design thought is developed for the novel indium-based metal organic framework material based on the pyridine hexacarboxylic acid ligand, and meanwhile, a new candidate is provided for developing a high-efficiency dye wastewater purification material.

A novel production scale-up adsorption separation device relates to the technical field of bioengineering product adsorption separation, and the technical scheme is: a filter is provided, the filter comprises an outer column pipe, an inner column pipe is arranged in the outer column pipe, and a hole is arranged in the inner column pipe; the filter is one or more than one; when the filter is one, a connecting piece is arranged in the middle of the outer column pipe, and N baffles are arranged on the connecting piece; the beneficial effects of the technical scheme are that the addition of the baffles enables the inner column pipe to form a relatively independent processing space, and liquid is circulated and communicated outside, so that the stability and uniformity of the fluid in the column pipe during the processing process are ensured, the production scale is expanded, the advantages of the original single equipment are guaranteed, the production land is saved, a plurality of single equipment is connected in series, each step is coordinated, the production efficiency is greatly improved, the utilization efficiency of the equilibrium liquid, the eluent and the like is improved, the cost is saved, and long-time automatic operation is realized.

The invention discloses a method for preparing gamma aluminum oxide nanosheets based on precise regulation and control of complex precipitation, which comprises the following steps: introducing an organic complexing agent into a water phase system, constructing an organic-inorganic mixed solvent environment, and inducing an aluminum precursor to generate two-dimensional oriented growth under an alkaline condition to obtain a flaky boehmite precursor; then carrying out high-temperature calcination to prepare gamma aluminum oxide nanosheets; the preparation method is simple in process, mild in condition and easy for large-scale preparation, and the prepared gamma aluminum oxide nanosheet can still keep stable sheet-shaped morphology and gamma phase structure after being re-sintered for five times at 1000 DEG C, has a hierarchical pore structure and a specific surface area of more than 40 m < 2 > / g, and shows excellent high-temperature structural stability; the material can be widely applied to the fields of high-temperature catalyst carriers, adsorption separation materials, advanced ceramics and the like, and has a good application prospect.

This invention discloses a covalent organic framework material for selective solid-phase adsorption and separation, its preparation method, and its applications. The material is prepared by polycondensation reaction of electron-deficient triazine rings with short-chain linkers such as hydrazine hydrate, forming a layered structure with a high specific surface area of ​​602 m² / g and a concentrated pore size of 2.0 nm to 3.0 nm. This structure exhibits high adsorption capacity (up to 1.0 mg / g), rapid adsorption kinetics, and excellent selectivity for PAHs in organic solutions through strong π-π interactions and pore confinement effects. The preparation process is simple and the conditions are mild. The material has good thermal stability (>300℃), and its performance retention rate is higher than 92% after 5 cycles. When applied to the solid-phase adsorption of PAHs in petroleum products such as lubricating oil and white oil, it effectively eliminates matrix interference, allowing direct analysis without complex purification steps after adsorption. This overcomes the limitations of traditional materials such as silica gel and activated carbon, which have weak adsorption capacity and require cumbersome post-treatment, providing a new high-performance adsorption material solution for the efficient detection of trace PAHs in petroleum products.

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.

This invention relates to the field of natural product separation technology, specifically to coumarin compounds isolated from *Hypericum perforatum*, their preparation methods, and applications. The preparation method of these coumarin compounds includes alcohol extraction from *Hypericum perforatum*, followed by macroporous resin adsorption separation and column separation. The coumarin compounds of this invention can be used for anti-inflammatory purposes, exhibiting inhibitory activity against RAW264.7 cells and the expression of TNF-α, IL-1β, and IL-6 proteins.

The application relates to an IGCC system coupled with biomass and near-zero emission high-purity CO2 capture and a working method thereof, and belongs to the field of coal gasification combined cycle power generation coupled with biomass, in particular to an IGCC system coupled with biomass and near-zero emission high-purity CO2 capture and a working method thereof. The application is used for solving the problems that the existing IGCC system has low CO2 capture rate, high energy consumption, low power generation efficiency, and a large amount of nitrogen generated in the oxygen taking process and difficult to effectively utilize. The application comprises an air separation device, a gasification furnace, a sensible heat recovery device, a purification device, a gas power generation unit, a waste heat recovery unit, a steam power generation unit, a biomass fermentation device, a methane reforming unit, an adsorption separation unit and an ammonia synthesis tower. The application is based on the overall coal gasification combined cycle power generation system of post-combustion CO2 capture and oxygen-enriched combustion technology, introduces a biomass ammonia synthesis process, generates H2 and CO through biomass fermentation and reforming, utilizes N2, and improves the system efficiency.

The application belongs to the technical field of membrane and adsorption separation material preparation, and particularly relates to a MOFs composite film rich in nitrogen atoms and a preparation method and application thereof. The preparation method comprises the following steps: firstly, synthesizing UiO-66-NH2, introducing aldehyde groups on the surface of the UiO-66-NH2 through a condensation reaction, then performing amino functionalization, and finally mixing and crosslinking to obtain the MOFs film rich in nitrogen atoms. The MOFs composite film prepared by the application has good uniformity, high mechanical strength and good flexibility, and is simple and convenient to form into a film, can be used as a separation membrane for adsorbing and removing heavy metal ions in water, and can also be used for enriching and recycling rare and precious metals in metallurgical wastewater. The MOFs composite film prepared by the application has high selectivity and large adsorption capacity for molybdenum ions, and has very significant application value.

The utility model discloses a magnetic microsphere cleaning and separating device which comprises a box body, a cleaning barrel is arranged on the inner side of the box body; a stirring device is arranged on the box body, is positioned above the cleaning barrel, extends into the inner side of the cleaning barrel and is used for stirring and cleaning the magnetic microsphere dispersion liquid; the stirring device comprises a magnetic stirring rod, and when the stirring device is moved out of the cleaning barrel, the magnetic microspheres are adsorbed and separated; the magnetic stirring rod capable of being taken out is designed, after cleaning is conducted through the ultrasonic generator and the stirring device, the permanent magnet is rapidly taken out, the magnetic microspheres adsorbed to the outer side naturally slide down, water is added for continuous stirring and cleaning, ultrasonic cleaning, magnetic stirring and separation are integrated, cleaning and separation work of a large number of magnetic microspheres can be rapidly completed, and high efficiency and convenience are achieved.

The application discloses an adsorbent for removing trace metal ions in alcohol ether solvents and a preparation method and application thereof, and belongs to the field of chemical separation technology. The adsorbent is a zirconium-based metal organic cage material with discrete structure formed by coordination self-assembly of a zirconium metal salt and a nitrogen-containing polycarboxylic acid organic ligand. The adsorbent has specific ion nanowells, and can form a strong limited synergistic effect with metal ions. The adsorbent is suitable for adsorption and separation of trace metal ions in various alcohol ether solvents, and has high metal ion adsorption and removal efficiency.

The utility model relates to two sets of adsorption production systems in an aromatic hydrocarbon factory, in particular to a raffinate tower top heat exchange system of an adsorption separation unit of an aromatic hydrocarbon combination device, which comprises a raffinate tower and a desorption agent regeneration tower, and the raffinate tower is connected to a raffinate tower return tank through a raffinate tower gas phase outlet pipeline. The raffinate tower reflux tank is connected to the raffinate tower through a raffinate reflux pipeline and a raffinate reflux pump, and a raffinate tower top air cooler is arranged on a gas phase outlet pipeline of the raffinate tower; the desorption agent regeneration device is connected to the raffinate tower through a regeneration tower gas phase outlet pipeline, and a regeneration tower gas phase control valve is arranged on the regeneration tower gas phase outlet pipeline; and the regeneration tower gas phase outlet pipeline and the raffinate tower gas phase outlet pipeline are connected through a first overline and a second overline. The tower top flow of the raffinate tower exchanges heat with the tower top flow of the desorption agent regeneration tower, so that the temperature of an outlet of an air cooler at the top of the raffinate tower is increased, the anti-freezing effect is achieved, a heat tracing pipeline is not needed, and the energy loss is reduced.

The invention relates to the technical field of chemical separation, in particular to a three-dimensional flexible metal organic framework material and a preparation method and application thereof. The structural general formula of the metal organic framework material is A (TIB) 2, A is a transition metal cation, and TIB is 1, 3, 5-tri (1H-imidazole-1-yl) benzene. Transition metal cations and TIB are self-assembled in an octahedral hexa-coordination mode to form a two-dimensional layered frame, and the two-dimensional layered frame is further stacked to form a three-dimensional flexible structure. The material has a two-dimensional layered skeleton with high stability and a pore surface with a partial electrostatic potential, not only shows a strong capture capability on carbon dioxide, but also provides a suitable storage space for acetylene, can selectively adsorb and separate an acetylene / carbon dioxide / ethylene mixed system, and realizes one-step purification of ethylene from a ternary mixture. In addition, due to excellent cyclic regeneration performance, solvent stability and thermal stability, the adsorbent is expected to be an efficient adsorbent applied to industrial adsorption separation.

This invention discloses the preparation and gas adsorption separation application of pyrazole-3,4,5-tricarboxylic acid ligand heteronuclear metal-organic framework materials, comprising the following steps: 1) Weighing CuCl2·2H2O, Ba(NO3)2, and 1H-pyrazole-3,4,5-tricarboxylic acid as raw materials; 2) Placing the raw materials in a polytetrafluoroethylene-lined reactor, adding distilled water, and adjusting the pH to 2-4 with malonic acid; 3) Sealing the reactor and heating the reaction, raising the temperature from room temperature to 80-120℃ over 0-12 hours, holding the temperature for 70-75 hours, and then lowering it to room temperature over another 0-12 hours; 4) Collecting the product, washing, and vacuum drying to obtain the chemical formula [Cu2Ba(HL)2(H2O)3]. n The crystal is a pyrazole-3,4,5-tricarboxylic acid. By combining the multi-site coordination advantages, heterometallic node construction advantages, and pore functionalization control advantages of pyrazole-3,4,5-tricarboxylic acid, a stable framework structure can be constructed while simultaneously adjusting pore size, optimizing pore wall polarity, and constructing local adsorption sites, thereby enhancing the material's application potential in SF6 capture and separation, and C2 gas adsorption and storage.

The invention discloses a metal ion induced alginate aerogel fiber as well as preparation and application thereof. The method comprises the following steps: pre-mixing a sodium alginate solution with a coagulating bath solvent to obtain a uniform spinning solution; extruding the spinning solution into an alcohol coagulating bath through wet spinning to form sodium alginate primary gel fibers; then, introducing the nascent fiber into a calcium ion cross-linking solution with a specific concentration for cross-linking and curing; and finally, drying at normal temperature and normal pressure to obtain the calcium alginate aerogel fiber. The method is simple in process and low in cost, and the obtained fiber has wide application prospects in the fields of adsorption separation, heat insulation, tissue engineering and the like.

An adsorptive separation method is disclosed. The adsorptive separation method of the present invention is a method for adsorptively separating a first gas from a mixed gas using a plurality of adsorption beds provided with an adsorbent selectively adsorbing the first gas, characterized by comprising an adsorption step, a depressurization step, a first rinse step, a second rinse step, a depressurization desorption step, a purge step, a pressurization step, a pressure increasing equalization and step, a repressurization step. According to the present invention, in the second rinse step, a high-purity first gas is introduced into the adsorption bed at a first pressure, and in the depressurization desorption step, the first gas is compressed to the first pressure by a compressor in a process of being transferred to a high-pressure product vessel, thereby making it possible to provide an adsorptive separation method configured to reduce power consumption by pressurizing a product gas of atmospheric pressure or higher discharged in a blowdown step to a pressure at which a rinse is performed, and to reduce power consumption used to create a recirculation stream used for the rinse.

The present disclosure relates to a method for separating naphtha, comprising: feeding naphtha and a first desorbent into a first adsorption separation tower for first adsorption separation to obtain a first extract and a first raffinate; feeding the first raffinate into a first rectifying tower for first rectification treatment to obtain a first stream mainly containing cycloalkanes and alkanes; feeding the first stream and a second desorbent into a second adsorption separation tower for second adsorption separation to obtain a second extract and a second raffinate; feeding the second raffinate into a second rectifying tower for second rectification treatment to obtain a second stream mainly containing alkanes; feeding the first extract and the second extract into a third rectifying tower for third rectification treatment to obtain a third stream mainly containing aromatic hydrocarbons and cycloalkanes; wherein the first desorbent is selected from heavy aromatic hydrocarbon components, and the second desorbent is selected from light hydrocarbon components. The method of the present disclosure has low cost, simple process, high separation purity and high yield.