1691 results about "Electrodialysis" patented technology

The invention provides a house waterproof maintenance system based on an intelligent detection and self-repairing technology, and the system comprises an intelligent sensing layer which is used for collecting multi-dimensional physical parameters of building waterproof key nodes in real time; the edge calculation analysis layer is used for performing fusion analysis and risk prediction on the perception data; the dynamic self-repairing execution layer is used for triggering a multi-stage repairing mechanism according to an analysis result; the cloud management layer is used for realizing visual management and control and strategy optimization of the whole system, and relates to the technical field of building waterproofing, the building state is monitored in real time through a multi-mode sensing network, water leakage risk prediction is realized in combination with an edge calculation algorithm, and collaborative repair of a microcapsule repair agent, a shape memory alloy grid and an electrodialysis module is triggered; the system remarkably improves the timeliness and reliability of waterproof maintenance, reduces the manual intervention cost, and is suitable for intelligent maintenance of residential buildings, industrial buildings and historical protection buildings.

Thin film composite cation exchange membranes and systems and methods thereof, and, more particularly, thin film composite cation exchange membranes for monovalent / divalent ion separation in electrodialysis and thin film composite cation exchange membranes for achieving Li separation.

The invention relates to the technical field of cationic polymers, in particular to a high-alkali-resistance polyarylene alkylene piperidine cationic polymer as well as a preparation method and application thereof. The preparation method of the high alkali resistance poly (arylene alkylene piperidine) cationic polymer comprises the following steps: carrying out catalytic polycondensation on 1-R6-3-piperidine formaldehyde or salt or hydrate thereof and an aromatic compound to obtain a polymer with a piperidine structure; and further performing ionization reaction to obtain the polyarylene alkylene piperidine cationic polymer. The anion exchange membrane prepared based on the piperidine cationic polymer has ultrahigh alkali resistance and excellent mechanical properties and ionic conductivity, and can be used in the electrochemical energy conversion fields of fuel cells, water electrolysis hydrogen production, carbon dioxide electroreduction, flow batteries and the like, and the separation fields of electrodialysis, water treatment and the like.

The invention belongs to the technical field of wastewater treatment, and provides an ammonium nitrate production wastewater treatment process which is mainly composed of a neutralization tank, a tubular heat exchanger, a precision filter, a ceramic filter, a concentrated stock solution box, an ionic membrane concentration device, a desalination stock solution box, an ionic membrane desalination device, a reverse osmosis water inlet box, an RO security filter and a reverse osmosis device. The neutralization adjusting system enables the content of dilute nitric acid or free ammonia in the condensate to be reduced to the minimum, normal operation of subsequent treatment procedures is not affected, the condensate is filtered by the filter and then enters a concentrated stock solution box of the electrodialysis system, and stable and normal work of the electrodialysis system is ensured; the concentrated solution containing ammonium nitrate is collected by the concentrated solution box, and then is recycled to a factory area for production by the concentrated solution recycling pump; produced water enters a qualified water tank to serve as circulating water supplementary water, and concentrated liquid returns to an electrodialysis system to be treated again; recycled liquid is recycled, energy is saved, cost is saved, and environment friendliness is achieved.

The invention relates to the technical field of membrane separation and resource recovery, and discloses a bipolar membrane electrodialysis device for synchronously capturing carbon dioxide, extracting lithium and producing lithium carbonate. The device utilizes a selective bipolar membrane electrodialysis system to extract lithium ions from liquid resources such as spodumene leachate, brine, oil and gas field wastewater, seawater and the like, and converts the lithium ions into lithium hydroxide. And meanwhile, introducing flue gas containing carbon dioxide into the generated lithium hydroxide solution by using a gas disperser to generate lithium carbonate. Therefore, mineralization capture of carbon dioxide in the flue gas, extraction of lithium ions in liquid resources such as spodumene leachate, brine, oil and gas field wastewater and seawater and production of lithium carbonate are synchronously realized, waste is treated by waste, and the method has the advantages of simple process, high lithium ion yield, short period, environmental friendliness, no pollution, continuous production and the like, and is suitable for industrial production. The method has important significance on carbon dioxide capture, lithium resource recovery and development of the new energy industry.

The invention relates to layered bodies made of LiSICon material, their production, and use. The underlying objective was to provide a membrane for the deposition of lithium from contaminated lithium-containing water that is comparatively inexpensive and offers good lithium permeability during electrodialysis. This objective is achieved by coating a substrate with a LiSICon material using aerosol-based cold deposition. This process yields a layered body that, due to its specific material combination, is ideally suited as a membrane for electrodialytic lithium deposition.

The invention discloses a high-strength safety protection type electrodialyzer, and relates to the technical field of electrodialyzers, the high-strength safety protection type electrodialyzer comprises a protection frame, an electrodialyzer body is fixedly mounted in the protection frame, a rotating door is rotatably mounted on the inner wall of the protection frame, a rainproof plate is fixedly mounted on the top of the protection frame, and a heat dissipation opening is formed in the surface of the protection frame; a scraping plate is arranged on the inner wall of the heat dissipation opening; the rain and snow prevention device is arranged on the surface of the protection frame, the rain and snow prevention device comprises a supporting frame, a winding device, a linear motor, a sliding block, a fixing rod, a sliding rail, an elastic telescopic rod, a triangular block and a rotating scraping plate, the sliding block moves downwards to drive the fixing rod to move downwards, and the fixing rod moves downwards to make contact with the triangular block; the supporting frame is fixedly installed on the surface of the protection frame, a scraper blade is rotated to move downwards to scrape the filter screen, and the situation that too much dust adheres to the filter screen, the heat dissipation effect of equipment becomes poor, and normal operation of the equipment is affected is prevented.

The present invention relates to a system and a treatment method for treating high-phosphorus wastewater and resourcefully utilizing phosphorus elements. The system includes a bipolar membrane electrodialysis device, a phosphorus precipitator, and a membrane treatment device. Inside the bipolar membrane electrodialysis device, there are successively arranged a cathode, a first bipolar membrane, a main cation exchange membrane, a main anion exchange membrane, a second bipolar membrane, and an anode. Between the first bipolar membrane and the main cation exchange membrane is an alkali chamber, between the main cation exchange membrane and the main anion exchange membrane is a wastewater chamber, between the main anion exchange membrane and the second bipolar membrane is an acid chamber, the outside of the first bipolar membrane is a cathode chamber, and the outside of the second bipolar membrane is an anode chamber; the high-phosphorus wastewater is input into the wastewater chamber, the acid chamber is provided with a phosphoric acid recovery pipe, and the alkali chamber and the wastewater chamber are respectively connected to the phosphorus precipitator through an alkali liquid pipe and a first water production pipe; the phosphorus precipitator is provided with a precipitant inlet for inputting a calcium precipitant or a magnesium precipitant, the concentrated water outlet of the membrane treatment device is connected to the wastewater chamber, and the produced water of the membrane treatment device is reused as reclaimed water.

The invention discloses a method for efficiently separating and purifying plant exosomes and application, and belongs to the technical field of biological nanotechnology. The method comprises the following key steps: (1) performing sterile cleaning on plant raw materials, and then performing peeling or tissue slitting pretreatment; (2) carrying out mechanical crushing treatment by adopting a phosphate buffer solution (PBS), and filtering through a 200-mesh screen to obtain a primary extracting solution; (3) performing gradient centrifugal purification on the extracting solution, collecting supernate, and filtering the supernate through a 0.45 mu m microporous filter membrane; (4) adding 8-12% of polyethylene glycol for low-temperature phase separation and precipitation; (5) purifying by using an electrodialysis technology; and (6) carrying out final concentration by adopting a 100kDa ultrafiltration membrane to obtain the high-purity PELNs preparation. According to the method, the process, equipment and reagents are simple and easy to obtain, the final yield is high, the purity is high, particle size distribution is uniform, and an innovative solution is provided for large-scale industrial production of natural-source nano-drug carriers.

The invention belongs to the field of cation exchange membranes, and discloses a monovalent selective cation exchange membrane with crown ether encapsulated in the membrane and a preparation method of the monovalent selective cation exchange membrane. Firstly, a sulfonated chloromethylated polymer is synthesized, a solvent is evaporated to form a membrane, and a chemical reaction of chloromethyl and amido contained in the membrane endows a growth site of a covalent organic framework. And then constructing a covalent organic framework in a membrane channel by an in-situ growth method, and packaging the crown ether nano material in the membrane. A regular porous channel of the covalent organic framework and a sulfonic acid group in the base membrane have a synergistic effect, so that good ion flux of monovalent ions is ensured. Meanwhile, the crown ether structure has a special recognition complexing effect on alkali metal ions and has different affinity to different metal ions, so that the monovalent cation selective separation is achieved, and the prepared monovalent selective cation exchange membrane is suitable for an electrodialysis process.

The invention discloses a method for extracting lithium from gas field produced water with a high sodium-lithium ratio, and belongs to the technical field of chemical engineering. The mass ratio of sodium to lithium in the gas field produced water is (100-1000): 1, and the method comprises the following steps: S1, nanofiltration: carrying out nanofiltration on the gas field produced water, and intercepting divalent ions to obtain nanofiltration produced water and nanofiltration concentrated water; s2, adsorbing and extracting lithium, namely adjusting the pH value of the sodium-filtered produced water, treating the sodium-filtered produced water through a lithium-sodium adsorption and separation device filled with an adsorbent to realize sodium-lithium separation, and collecting the adsorbed lithium-extracted produced water; s3, desorption of lithium ions: eluting the adsorbent with an acid solution to desorb the lithium ions from the adsorbent, and collecting an eluent; s4, concentration: carrying out reverse osmosis treatment on the eluent, and treating the reverse osmosis concentrated solution through an electrodialysis device to obtain a concentrated lithium-containing concentrated solution; and S5, lithium precipitation: adjusting the pH value of the lithium-containing concentrated solution, adding a lithium precipitation agent, and crystallizing and precipitating lithium to obtain industrial-grade lithium carbonate. The process is simple, the lithium recovery rate during lithium precipitation can be effectively increased, and full-automatic continuous operation can be achieved.

The invention discloses an ammonia-nitrogen wastewater treatment device and method capable of generating target ammonium salt, the ammonia-nitrogen wastewater treatment device comprises a bipolar membrane electrodialysis device and a membrane contactor, the bipolar membrane electrodialysis device comprises at least one treatment unit and an anode chamber and a cathode chamber which are separated by the treatment unit; the treatment unit comprises a front bipolar membrane, a front cation exchange membrane, a middle bipolar membrane, an anion exchange membrane, a rear cation exchange membrane and a rear bipolar membrane which are sequentially arranged in the direction from the anode chamber to the cathode chamber, and a feeding chamber, an ammonia production chamber, an acid production chamber, a desalting chamber and an alkali production chamber are respectively formed in spaces generated between the corresponding membranes; the membrane contactor comprises a breathable hydrophobic membrane dividing an inner cavity of the membrane contactor into a first chamber and a second chamber, and the first chamber and the second chamber communicate with the ammonia production chamber and the acid production chamber through pipelines correspondingly. And the method has relatively high application and popularization values.

The invention belongs to the field of cation exchange membrane batteries, and particularly relates to an MXene auxiliary cation exchange membrane for electrodialysis desalination and a preparation method of the MXene auxiliary cation exchange membrane. The MXene-assisted cation exchange membrane for electrodialysis desalination comprises a matrix formed by a sulfonated polymer and an MXene nanosheet filled in the matrix. According to the MXene-assisted cation exchange membrane prepared by the invention, from the aspect of lamellar size, MXene with small lamellar size is added into a matrix formed by the sulfonated polymer, so that not only is the dispersity in the matrix increased, but also a more continuous ion transmission channel can be constructed in the matrix, and further transmission of ions is facilitated.

The invention provides a vacuum concealed pipe circulating water salt elimination system which comprises a plurality of concealed pipes which are respectively connected with a water conveying pipe through a water collecting pipe; the concealed pipe comprises a pipe body, and a plurality of water collecting holes are formed in the pipe body; each water collecting pipe is provided with a vacuum negative-pressure drainage device, the water conveying pipe is connected with a salt washing water treatment device, and the water conveying pipe is provided with a water suction pump; a water outlet pipe is further connected to the salt washing water treatment device, and the water outlet pipe is connected with an irrigation leaching water distribution device used for leaching soil; the front end of the electrodialysis treatment unit is connected with a water storage tank, and the rear end of the electrodialysis treatment unit is connected with a fresh water tank. Water and air in soil are pumped out through air pumping of the vacuum pump, negative pressure is formed, and the water drainage speed in the concealed pipe salt drainage process is increased, so that the single-time salt leaching time is shortened, the salt drainage efficiency is greatly improved, the concealed pipe laying investment cost is reduced, water is saved, and water pollution caused by direct drainage of salt washing water is prevented.

The invention relates to the technical field of coal bed gas development and gas extraction, in particular to an electrodialysis-liquid CO2 time sequence synergistic anti-reflection method and system. Comprising an electrodialysis pretreatment stage, a CO2 synergetic permeability increasing stage and a process regulation and energy recovery stage, a mixed solution is injected into a coal seam in a pulse injection mode, and energy recovery is conducted through pipeline fluid pressure in the injection stopping period. According to the technical scheme, through multi-stage cooperation of electrodialysis pretreatment, CO2 phase change fracturing and pulse consolidation and regulation, accurate transformation of the coal seam low-permeability area is achieved. According to the scheme, electrodialysis is utilized to drive an acidic working solution to target and migrate to a difficult-to-permeate area, mineral substances are dissolved, and pores are expanded; then, high-energy expansion stress is generated through liquid CO2 phase change, and a through fracture network is formed; and finally, a pulse injection and energy recovery mechanism is adopted, fracture closing is restrained, system energy consumption is reduced, and therefore the coal seam breathability and the gas extraction efficiency are integrally improved.

The utility model discloses an electrodialysis device with an automatic hydraulic station, and belongs to the field of electrodialysis devices. The hydraulic cylinder is connected with the electrodialysis assembly; an oil tank; one end of the pump body is communicated with the oil tank; the inlet end of the one-way valve is communicated with the other end of the pump body, and the outlet end of the one-way valve is communicated with the hydraulic cylinder; one end of the pressure sensor is communicated with the oil tank, and the other end of the pressure sensor is communicated between the outlet end of the one-way valve and the hydraulic cylinder; one end of the electromagnetic valve is communicated with the oil tank, and the other end of the electromagnetic valve is communicated between the outlet end of the one-way valve and the hydraulic cylinder; and the controller is electrically connected with the pressure sensor and the electromagnetic valve. The utility model has the technical effects that the pressure can be automatically controlled conveniently, and the pressure can be prevented from being too large or too small.

The invention relates to a novel composite bipolar membrane for preparing low-carbon alcohol alkali metal salt and an electrodialysis process of the novel composite bipolar membrane, and belongs to the technical field of membrane separation and electrochemical synthesis. The composite bipolar membrane comprises a cation exchange layer, a middle catalyst layer and an anion exchange layer which are sequentially laminated and compounded, the process comprises the following steps: introducing a salt solution containing alkali metal ions into an anode chamber of a bipolar membrane electrodialysis system, and introducing a low-carbon alcohol solution into a cathode chamber; applying a direct-current electric field to the two sides of the composite bipolar membrane, so that the low-carbon alcohol is dissociated at the membrane interface to generate alkoxy ions and hydrogen ions; the alkoxy ions migrate to an anode chamber to be combined with the alkali metal ions to generate low-carbon alcohol alkali metal salt; the membrane material is high in adaptability, the membrane structure is good in stability, technological parameters are mature, and the system integration degree is high.

The invention relates to a method and device for preparing formic acid and hydrogen through electrolysis. According to the method, an alkaline electrolyte containing methanol is electrolyzed, a cathode electrode for electrolysis takes foamed nickel as a base material to load iron-cobalt-nickel nanoparticles, an anode electrode takes foamed nickel as a base material to load cobalt-nickel particles, and a cathode chamber generates hydrogen; and collecting the electrolyte obtained after electrolysis in the anode chamber in the electrolysis device for bipolar membrane electrodialysis, and obtaining a primary formic acid solution in the acid chamber of the bipolar membrane electrodialysis device. The device comprises an electrolysis device and a bipolar membrane electrodialysis device, a cathode electrode, a first bipolar membrane, a positive membrane, a negative membrane, a second bipolar membrane and an anode electrode are sequentially arranged in the bipolar membrane electrodialysis device, and an acid chamber, a salt chamber and an alkali chamber are sequentially divided among the first bipolar membrane, the positive membrane, the negative membrane and the second bipolar membrane. Compared with an existing methyl formate hydrolysis method for preparing formic acid, an intermediate methyl formate is toxic to a human body, formic acid and hydrogen can be safely prepared, and production safety accidents are prevented.

The invention discloses a carbon capture system for purification and circulation of an organic amine solution, the carbon capture system comprises an absorption tower, a regeneration tower and a purification assembly, the absorption tower is used for capturing carbon dioxide in flue gas by using the organic amine solution, and the regeneration tower is connected with the absorption tower through a pipeline; the regeneration assembly comprises a multi-stage filter and an electrodialyzer, the regeneration tower is connected with the absorption tower through a pipeline and sequentially passes through the multi-stage filter and the electrodialyzer, and the regeneration tower is connected with the absorption tower through a pipeline and sequentially passes through the multi-stage filter and the electrodialyzer. And part of barren liquor flows back to the absorption tower after being filtered and desalted by the multi-stage filter and the electrodialyzer. According to the invention, heat-stable salts, high-molecular-weight degradation products and other impurity pollutants in the system are removed through the multi-stage filter and the electrodialyzer, meanwhile, the problem that alkaline wastewater is generated by amine liquid purification through an ion exchange method is avoided, cyclic utilization of resources is realized, and the efficiency and economical efficiency of the system are improved.

A method for synchronously remediating organically contaminated soil and groundwater by means of electrokinetic coupled multiphase extraction. Cathode wells and anode wells are distributed in a staggered manner in an area to be remediated; a pipe filled with an electrolyte is inserted into each of the cathode wells and the anode wells; an extraction pipe is inserted into each cathode well; electrodes are connected to an electrokinetic remediation system; the extraction pipes are connected to a multiphase extraction system; by means of electrokinetic remediation, persulfate anions in a catholyte are injected into a stratum from the cathode wells and are then migrated to an anode by means of the action of electromigration, iron ions released by a sacrificial anode in an anolyte are migrated to a cathode by means of the action of electromigration and electrodialysis, and persulfate in soil and groundwater are activated during "opposite-direction" migration; then, the direction of an electric field is switched, and at the same time, electrolytes are added to corresponding electrode wells for "opposite-direction" migration, and remediation treatment is performed according to the above electrode-based remediation method and an electrode-based remediation method in which an electrode direction is switched, until organically contaminated soil and groundwater in the area to be treated are completely remediated at the same time; and the multiphase extraction system is started after the electrode-based remediation, and the electrolytes in the electrode wells are depleted. Further disclosed is the use of the method for synchronously remediating organically contaminated soil and groundwater by means of electrokinetic coupled multiphase extraction in in-situ remediation of organically contaminated soil.

According to the portable seawater desalination device provided by the scheme, a miniature magnesium air battery is used as a power supply, and a [Fe (CN6)] < 4-> / [Fe (CN6)] < 3-> redox medium is added into a cathode chamber and an anode chamber of an electrodialysis unit to form a high-concentration redox electrolyte, so that the current density and the ion migration rate are improved. A magnesium electrode is adopted as an anode and cooperates with a miniature magnesium air battery, the electrochemical environment is optimized, efficient and high-water-recovery-rate seawater desalination is achieved, seawater can be stably desalted into fresh water (TDS is smaller than or equal to 1000 mg / L) meeting the drinking water standard, and the seawater desalination device is suitable for outdoor exploration, emergency and other scenes.

The invention relates to the technical field of biology, and particularly discloses a method for removing lactulose-based isomers in an oligosaccharide separation and purification process. The method comprises the following steps: taking oligosaccharide fermentation liquor for producing oligosaccharide through fermentation by using lactose as a substrate, sequentially carrying out thallus removal, decoloration, electrodialysis desalination, ion exchange resin desalination, concentration, sequential simulated moving bed chromatographic purification, ultrafiltration, re-concentration and spray drying, and detecting the oligosaccharide and the lactulose-based isomer in the oligosaccharide. According to the method disclosed by the invention, the content of lactulose-based isomers in the separation and purification process is greatly reduced, so that the product purity is effectively improved; the method can be applied to the synthesis process of other milk oligosaccharides such as fucose lactose (FL), lactose-N-tetraose (LNT), lactose-N-neotetraose (LNnT), lactose-N-fucopentasaccharide (LNPFI) and the like or other carbohydrates containing a lactosyl group, has a very high application value, and accords with laws and regulations.

The invention relates to a method of preparing a lactose-reduced milk product by e.g. ultrafiltration which method involves recovery of at least some of the mineral from the ultrafiltration permeate by electrodialysis.

The invention relates to the technical field of water pollution control and treatment, and particularly discloses a method for deeply treating wastewater based on an adsorbent, which comprises the following steps of: firstly, introducing a mixed gas of carbon dioxide and air into fly ash water washing liquid, and removing calcium ions in the water washing liquid in a calcium carbonate precipitation form in a continuous introducing process; interference of calcium ions on adsorption and electrodialysis processes in the subsequent treatment process is avoided, heavy metals in the water washing liquid are accurately adsorbed and removed while the iron-sulfur loaded magnetic mesoporous biochar is used for activating efficient oxidation of persulfate, finally, electrodialysis treatment is performed on the water washing liquid by using a self-made bipolar membrane, chlorine in water is taken out, and the heavy metals in the water washing liquid are removed. And the washing liquid can meet the requirement of wastewater discharge.

The application discloses a bipolar membrane electrodialysis device, which comprises an outer box body and further comprises a liquid inlet mechanism, a plurality of electrodialysis mechanisms and a plurality of filtering mechanisms. The filtering mechanism comprises a filtering box, a driving filtering assembly and a liquid feeding assembly. The driving filtering assembly comprises a motor installed on the top of the filtering box, the output shaft of the motor is fixedly connected with a threaded rod, the outer periphery of the threaded rod is threadedly connected with a filtering plate slidingly connected to the inner wall of the filtering box, and the bottom inner wall of the filtering box is fixedly connected with a plurality of plug rods matched with filtering holes of the filtering plate. Raw water is delivered to the inside of the filtering box through the liquid inlet mechanism, is actively filtered without turbulence through the driving filtering assembly, is delivered to the corresponding electrodialysis mechanism through the liquid feeding assembly and is further subjected to electrodialysis treatment. The filtering plate and other components are arranged to filter out the solid impurities mixed in industrial glucose acid salt, so that the bipolar membrane electrodialysis process and the bipolar membrane body are not affected.

The invention relates to the technical field of waste liquid treatment, in particular to a method for efficiently separating nickel, hypophosphorous acid and ammonia from chemical nickel plating waste liquid, which comprises the following steps: S1, nanofiltration: carrying out nanofiltration separation on chemical nickel plating waste water by using a roll type nanofiltration membrane to obtain nickel-containing waste water and waste water containing hypophosphorous acid and ammonia; s2, bipolar membrane electrodialysis: setting an arrangement mode of a bipolar membrane electrodialysis system as follows: sequentially arranging an anode, a first bipolar membrane, an anionic membrane, a cationic membrane, a second bipolar membrane and a cathode, introducing wastewater containing hypophosphorous acid and ammonia into a desalination chamber, and adding deionized water into an acid chamber and an alkali chamber to obtain a hypophosphorous acid solution and ammonia gas; separation of hypophosphorous acid and ammonia is realized; according to the method, hypophosphite and ammonium in the chemical nickel-plating waste liquid are efficiently separated, and the method has important significance on improving the resource utilization efficiency of phosphorus and ammonia in the chemical nickel-plating waste liquid and reducing the treatment difficulty and treatment cost of the chemical nickel-plating waste liquid.

The invention relates to the field of functional nutritional seasonings, and particularly discloses an abalone umami peptide prepared from an abalone cooking waste liquid and a preparation method thereof, and the preparation method comprises the following steps: (1) removing solid impurities from the abalone cooking waste liquid, and removing heavy metals by using electrodialysis; (2) adding the material obtained in the step (1) into specific protease accounting for 0.1-1% of the weight of the solid in the material obtained in the step (1), and carrying out an enzymolysis reaction under the conditions that the enzymolysis pH value is 6-7, the reaction temperature is 40-60 DEG C and the reaction time is 0.5-2 hours; and 3) removing impurities by using a nanofiltration membrane, and carrying out spray drying to obtain the abalone umami peptide. According to the abalone flavor peptide prepared by the method, the problem of environmental pollution caused by a large amount of abalone cooking waste liquid is solved, waste is turned into wealth, and a new way of resource utilization of the abalone cooking waste liquid is realized. The ratio gt of the molecular weight of the abalone umami peptide is 1-2KD; the seafood seasoning not only is high in antioxidant biological activity and low in heavy metal content, but also has rich seafood flavor, and can be widely applied to the field of functional nutritional seasonings.

A sequentially stacked multi-stage desalination system includes a single pair of electrodes, including an anode and a cathode; at least one ion concentration polarization device; and at least one electrodialysis device coupled with the ion concentration polarization device and configured to receive liquid flow from the ion concentration polarization device. Each ion concentration device and electrodialysis device is positioned between the anode and the cathode.

Plant for electrically producing sodium carbonate or bicarbonate Plant for electrically producing sodium carbonate (Na2CO3) comprising: (A) an electrodialyzer cellstack to electrodialyze a sodium chloride (NaCl) aqueous solution into a sodium hydroxide (NaOH) solution and into a hydrochloric acid (HCl) solution, wherein the electrodialyzer cellstack is operated in at least 2 production rates on a given time period; (B) carbonating mean(s) to partially or totally carbonate the NaOH solution with CO2 into a Na2CO3 solution; (C) storage mean(s) of the NaOH solution or of the Na2CO3 solution; (D) a crystallizer equipment to concentrate Na2CO3 solution and to produce Na2CO3 crystals and a mother liquor; and wherein the storage means of the NaOH solution, or of the Na2CO3 solution, is of a volume sufficient to operate the crystallizer equipment in a constant production rate in the said time period.

The invention belongs to the technical field of green processing of biomass materials, and particularly relates to a green preparation process of high-deacetylation-degree chitin. The preparation method aims at the problem of high energy consumption of existing high-deacetylation-degree chitin preparation. According to the method, raw materials are pretreated by utilizing a compound enzyme system under a low-temperature condition, chitin crystal lattices are preliminarily dissociated by combining a deep eutectic solvent at a medium temperature, high deacetylation conversion is realized through short-time dissolution of an ionic liquid, and meanwhile, a membrane separation-electrodialysis-gradient freezing crystallization three-stage recycling technology is matched, so that recycling of the solvent is realized; the method greatly reduces the reaction temperature and energy consumption, avoids the use of corrosive reagents, and has the advantages of environmental protection, low energy consumption, high deacetylation degree of the product, excellent quality and the like.