36 results about "Ion exchange" patented technology

The present disclosure relates to methods for isolating, amplifying, and/or analyzing nucleic acids in the presence of an anion exchange material by performing the isolation, amplification and/or analysis step in the presence of at least one anionic compound.

A catalytic composition is described for the alkylation and/or transalkylation of aromatic hydrocarbons consisting of beta zeolite, as such or modified by the isomorphous substitution of aluminum with boron, iron or gallium or by the introduction of alkaline and/or earth alkaline metals following an ion-exchange process, and an inorganic ligand, wherein the extrazeolite porosity, i.e. the porosity obtained by adding the mesoporosity and macroporosity fractions present in the catalytic composition itself, is such that a fraction of at least 25% is composed of pores with a radius higher than 100 ANGSTROM , said composition being characterized by a total volume of extrazeolitic pores greater than or equal to 0.80 ml/g.

Embodiments in accordance with the present invention relate to packed-column nano-liquid chromatography (nano-LC) systems integrated on-chip, and methods for producing and using same. The microfabricated chip includes a column, frits/filters, an injector, and a detector, fabricated in a process compatible with those conventionally utilized to form integrated circuits. The column can be packed with supports for various different stationary phases to allow performance of different forms of nano-LC, including but not limited to reversed-phase, normal-phase, adsorption, size-exclusion, affinity, and ion chromatography. A cross-channel injector injects a nanolitre/picolitre-volume sample plug at the column inlet. An electrochemical/conductivity sensor integrated at the column outlet measures separation signals. A self-aligned channel-strengthening technique increases pressure rating of the microfluidic system, allowing it to withstand the high pressure normally used in high performance liquid chromatography (HPLC). On-chip sample injection, separation, and detection of mixture of anions in water is successfully demonstrated using ion-exchange nano-LC.

The invention discloses a full extracting process for preparing ultra-pure gadolinium oxide and a product thereof. Compared with the traditional ion exchange and chromatography extraction method, the process has the characteristics of large yield and low cost. The primary-pure gadolinium oxide (Gd2O3 at the grade of 99.99 percent) is obtained in advance by adopting a rough gadolinium enriching substance (Gd3O3 at the grade of 10-90 percent) as a raw material and adopting a mixed extracting agent of P507 and P204 through optimized control of factors, such as material liquid concentration, grade, phase ratio, acidity, and the like and classical extraction and separation in two steps; then the electrochemical reduction and the fully-closed type extraction and separation are performed for carrying out deep purification, and trace rare-earth element impurities are removed; and finally, the ultra-pure gadolinium oxide product with the rare-earth impurity content below 0.5ppm is obtained.

The invention discloses a copper and iron compound honeycomb coating type denitrification catalyst as well as a preparation method and application thereof. The catalyst provided by the invention takesa copper-based molecular sieve prepared through an ion exchange method or an immersion method as an active component, ferric polysilicate is added as a co-catalysis component, a honeycomb cordieriteceramic block is used as a carrier and an aluminum sol is used as as a binder. The catalyst prepared by the invention is prepared through a vacuum coating method; the preparation method is simple to operate, holes are not liable to block in a coating process and large-scale production is easy to realize; a coating has a large capacity and the coating fastness of active components is high; a good cooperative catalysis effect is formed between duplex metal including copper and iron, the denitrification activity of the catalyst is improved and the anti-H2O performance and anti-SO2 performance ofthe catalyst are also improved. The catalyst provided by the invention has a denitrification efficiency of 90 percent or more in a range of 220 to 510 DEG C and has a good application prospect in a stationary source denitrification direction.

The invention relates to the field of lithium carbonate preparation, in particular to a method for extracting lithium from brine to prepare battery-grade lithium carbonate by an ion exchange method. The method includes the steps of 1), removing magnesium by a coprecipitation method; 2), adsorbing to extract the lithium by a manganese adsorbent; 3), preparing the battery-grade lithium carbonate, namely adding alkaline liquor into a desorption solution in the step 2), regulating a pH value to 7-12, producing manganese hydroxide precipitate, filtering the manganese hydroxide precipitate, concentrating filtrate until the lithium content reaches 20-30 g/L, filtering to remove sodium chloride, adding a saturated sodium carbonate solution to react, filtering, and subjecting filter cakes to water scrubbing so as to obtain the battery-grade lithium carbonate. The method has the advantages that hydrotalcite is obtained after magnesium removal, so that the problem of recycling the magnesium in the brine is solved; the content of various impurity ions in the desorption solution can be controlled effectively by removing the magnesium and extracting the lithium by adsorption sequentially, and then the battery-grade lithium carbonate is prepared.

The invention discloses an ultraviolet light-cured acrylate-layered double hydroxide nano composite material and a preparation method thereof; the preparation method is characterized in that a long-chain anionic surfactant is used for modifying inorganic layered double hydroxide by anion exchange; next, an acrylate modifier with isocyanate groups is used for modifying the surface hydroxyls of the layered double hydroxide, a large amount of high-reactivity acrylate groups are grafted; and finally, the layered double hydroxide used with modified surface is mixed with acrylate monomers, acrylate oligomer and an ultraviolet light initiating agent to obtain the ultraviolet light-cured acrylate-layered double hydroxide nano composite material. The preparation method has simple and easy operation, realizes high-degree delamination and good dispersion of the layered double hydroxide in a polymeric matrix. Compared with the pure acrylate material, the ultraviolet light-cured acrylate-layered double hydroxide nano composite material has high strength, high hardness and good thermal stability after being cured by the ultraviolet light, thus having wide industrial application prospect.

The present invention discloses one kind of nanometer zirconium salt modified polyphenylene oxide composite proton exchange film material, which consists of modified polyphenylene oxide, imidazole or benzimidazole, and nanometer level zirconium salt. The modified polyphenylene oxide has the chemical structure as shown, characteristic viscosity of 0.50-0.80 dl/g and ion exchange capacity of 2.0-4.0 meq/g; and the nanometer level zirconium salt is zirconium phosphate or zirconium citrate. The nanometer zirconium salt modified polyphenylene oxide composite proton exchange film material has ion exchange capacity of 1.9-5.0 meq/g, thickness of 60-200 microns, excellent mechanical performance, high heat stability, low cost, high operation temperature and high conductivity. It may be applied in proton exchange film fuel cell and redox fluid flow cell.

The invention discloses an Escherichia coli camp receptor protein mutant, a genetic engineering strain and an application. A strain CRPG is obtained through mutating an amino acid I of a 112 positionof a camp receptor protein (CRP) of Escherichia coli into L, mutating T of a 127 position into G and mutating A of a 144 position into T and is applied to the Escherichia coli for producing xylitol ina manner of being combined with a ptsG gene knockout [delta]ptsG scheme, a CCR effect of the strain is thoroughly eliminated, and the concentration and production efficiency of the xylitol are greatly increased; and meanwhile, the tolerance of the strain to toxicants and inhibiting factors in hydrolyzate raw materials is improved, the xylitol is efficiently produced by directly utilizing a hemicellulose hydrolyzate prior to ion exchange, a raw material treatment process is simplified, the equipment investment is reduced, the production cost is reduced, and sewage emission is reduced.

The invention discloses a method for preparing a high-performance molecular sieve membrane through ion exchange at a melting state. The method comprises the steps of loading metal salt with the melting point being lower than a roasting temperature onto a molecular sieve membrane with a template agent being removed, drying the molecular sieve membrane, and carrying out melting-state ion exchange under the situation that the temperature is lower than the roasting temperature and higher than the melting point of metal salt to obtain the ion exchange molecular sieve membrane, wherein the roasting temperature is generated when the template agent in the molecular sieve membrane is removed. By the method, the CO2/CH4 selectivity of the molecular sieve membrane can be remarkably improved.

The invention relates to a mixed alkaline residue treatment method during indigo production, first alkaline residue solid waste which is rich in sodium carbonate and organic impurities and carries 20-30% of NaOH and KOH mixed alkaline is added into a reactor, wherein the alkaline residue solid waste is precipitated during the process of concentration of indigo oxidation filter pressing mother liquor, proper amount of water is added, after stirring even, carbon dioxide is introduced until hydroxy radicals are completely neutralized, by one-time centrifugal separation, sodium carbonate is separated to use as a byproduct for sell; then filtrate is extracted by an organic solvent for separation of an organic phase and a water phase, most of phenylamino acetate and by-product anthranilate enters the organic phase, the extracted water phase and organic phase are respectively distilled, after distillation, the solvent in the organic phase is recycled to use in the extraction process, the distilled water phase returns to the mixed alkaline concentrated by indigo oxidation filter pressing mother liquor, through ion exchange and secondary centrifugation separation, solid sodium carbonate is separated, and the separation mother liquor returns to the indigo production alkali balance system.

The present invention provides an improved method for the purification of a mixture of complexes comprising a stress protein complexed to a peptide or peptide fragment from a source mixture, typically a cell lysate. The method of the invention provides for protein complexes to be purified using ion exchange chromatography based methods, wherein a modified buffer solution is used which results in the purified stress protein complexes being more immunogenic than protein complexes obtained using conventional methodology. The purified complexes can be used to produce improved vaccine preparations which elicit enhanced immune responses in the subjects to whom the vaccine compositions are administered.

A method for preparing [¹⁸F]fallypride is disclosed, which comprises a first step for trapping a fluorine-18 to a polymer ion exchange cartridge; a second step for extraction of fluorine-18 by inputting low base concentrations: 5.0˜25 μL of 40% TBAHCO₃ or K2.2.2./K₂CO₃ (5˜25 mg/0.5˜3.0 mg) as a phase-transfer catalyst in a mixture of alcohol/water (1.0/0.2 (v/v)) or alcohol as a solvent into the polymer ion exchange cartridge trapped by the fluorine-18; a third step for preparing a [¹⁸F]fallypride product by removing the solvent from the trapped fluorine-18, by inputting tosylate precursor in CH₃CN as a solvent into a reactor and by reacting the same for 5˜35 minutes at 50˜120° C.; and a fourth step for preparing a pure [¹⁸F]fallypride by purifying the prepared [¹⁸F]fallypride product.

The invention relates to an MLDH (magnetic layered double hydroxides)-Fluorescein intercalation assembled type fluorescent probe. The invention is characterized in that the MLDH-Fluorescein intercalation assembled type fluorescent probe is prepared by a low-temperature ion exchange reaction, with MLDH as carriers and fluorescein as an intercalation object. The synthesized MLDH-Fluorescein probe has superparamagnetism, bright fluorescence signals, high thermal stability, strong nuclear targeting property in cell transmission, and capability of quickly infiltrating a cell membrane and passing through cytoplasm to deliver a fluorescent material to cell nucleus and enrich the fluorescent material to a nucleolus, so that the MLDH-Fluorescein probe can be used as a fluorescent probe for researching a cell transport mechanism of an MLDH system and evaluating the nuclear targeting transmission efficiency. The MLDH-Fluorescein intercalation assembled type fluorescent probe is applicable to establishment of a fluorescein, fluorandiol marked medicament or biomolecular targeting transport system and has the advantages of bright fluorescence signals, high storage stability, integration of multiple functions, simplicity in operation, low cost and the like.

The invention provides easily founded lithia-alumina-silica glass suitable for a low temperature type ion exchange process and chemical toughening. The lithia-alumina-silica glass comprises the following components in percentage by weight: 55 to 61.5 percent of SiO2, 5 to 13 percent of Al2O3, 13 to 20 percent of Na2O, 3.5 to 8 percent of K2O, 0 to 5 percent of ZnO, 0 to 8 percent of MgO, 0.5 to 5 percent of Li2O, and 0 to 1.5 percent of Sb2O. Through the reasonable setting of the components, the invention reduces the glass manufacturing difficulty, obviously decreases the glass founding temperature, and facilitates the energy consumption reduction and finished product yield improvement. Under the conditions of the toughening temperature of 380 to 500 DEG C and the toughening time of 4 to 12 hours, the surface bearing stress of the obtained glass reaches 340 to 700 MPa, the depth of the stressed layer reaches 20 to 60mu m, and the glass is reinforced and has high shock resistance.

An ion exchange resin tower including a tank, a supply line, an output line, and a plurality of sampling tubes is provided. The supply line guides a liquid into the tank, such that an ion exchange occurs between the liquid and the ion exchange resin in the tank. The processed liquid is guided out of the tank via the output line. The sampling tubes are disposed on a sidewall of the tank to sample the liquid flowing through the resin.

The invention provides a method for preparing calcium sulfate from ardealite. The method comprises the following steps: (1) adding a sodium hydroxide or potassium hydroxide solution into ardealite and stirring; and after room-temperature reaction, performing solid-liquid separation to obtain filter residue and a sulfate solution; and washing the filter residue to obtain calcium slag; (2) treating the sulfate solution obtained in the step (1) to obtain a sodium hydroxide or potassium hydroxide solution and a sulfuric acid solution, wherein the treatment method is electrodialysis or ion exchange; (3) adding a first acid solution into the calcium slag obtained in the step (1), and dissolving the calcium slag to obtain a solution containing calcium ions, wherein the first acid solution is hydrochloric acid or acetic acid; and (4) mixing the sulfuric acid solution obtained in the step (2) with the solution containing calcium ions obtained in the step (3) for exchange reaction to obtain a calcium sulfate precipitate. According to the method, a main product, namely calcium sulfate with relatively high purity and additional value, is obtained by a chemical reagent cycling treatment method, and high-efficiency comprehensive utilization of ardealite is realized.

The invention discloses BaKL zeolite rich in mesopores and a preparation method of the BaKL zeolite. The BaKL zeolite rich in mesopores is prepared by a method comprising the following steps: mixing K2O, Al2O3, SiO2, H2O and BaO into gel according to the molar ratio of (4-22.5) K2O: Al2O3: (10-25) SiO2: (180-350) H2O: (0.02-0.2) BaO, then standing for aging for 12-72 h at the temperature of 10-60DEG C to obtain a guiding agent; mixing K2O, Al2O3, SiO2 and H2O into gel according to the molar ratio of (4-12) K2O: Al2O3: (10-30) SiO2: (120-300) H2O, successively adding an organic pore-enlargingagent which accounts for 5-20% of the mass of added solid substances for synthesizing the gel and a guiding agent which accounts for 10-40% of the mass of the added solid substances for synthesizing the gel, crystallizing the gel at the temperature of 100-200 DEG C for 12-72 h, and finally filtering, washing, drying and roasting to obtain the BaKL zeolite rich in mesopores. The invention further provides a Pt/BaKL catalyst prepared by loading the BaKL zeolite with Pt through an ion exchange method, and the Pt/BaKL catalyst has excellent aromatic hydrocarbon selectivity and one-way service life.

The invention discloses a treatment system and method for mixed waste liquid of drilling wastewater and fracturing flowback fluid. The system comprise a wastewater storage unit, a flocculant filling unit, a coagulant aid filling unit, a static mixing unit, a micro-chemical flocculation unit, a gravity settling unit, an ion masking agent filling unit and an ion exchange unit. A flocculant is addedto the mixed waste liquid of the drilling wastewater and the fracturing flowback fluid sequentially and evenly mixed with the mixed waste liquid, a coagulant aid is added to the mixed waste liquid ofthe drilling wastewater and the fracturing flowback fluid for reaction, floating matter and precipitates are finally removed by standing, corresponding treatment agents are selected according to the characteristics of different metal ions in the wastewater to remove calcium, magnesium and boron ions in the wastewater, and treatment can be completed with the process. After treatment with the process, the concentration of suspended matter in water is lower than or equal to 10 mg/L, the concentration of calcium ions is lower than or equal to 300 mg/L, the concentration of magnesium ions is lowerthan or equal to 150 mg/L, and the concentration of boron ions is lower than or equal to 10 mg/L. The treated mixed waste liquid of the drilling wastewater and the fracturing flowback fluid can be used for guanidine gum fracturing water in tight gas wells, and reuse of water resources is realized.

The invention discloses an ion exchange technology based energy-saving water purifier. The ion exchange technology based energy-saving water purifier comprises a water purifier body, wherein three functional chambers are arranged inside the water purifier body and comprise a filter chamber, a purification chamber and a water storage chamber sequentially from left to right, the filter chamber is incommunicating connection with the purification chamber, and the purification chamber is in communicating connection with the water storage chamber; and a convenient filter element replacement deviceis arranged in the purification chamber and comprises a hollow cylindrical pipe and a mounting column connected with the hollow cylindrical pipe, a limiting bar is arranged on the hollow cylindrical pipe, an ion exchange filter element is arranged on the hollow cylindrical pipe in a sleeve manner, threads are formed in the top of the mounting column, a rotary hand grip is mounted at the top end ofthe mounting column, and the mounting column is rotatably connected to the top of the water purifier body. According to the ion exchange technology based energy-saving water purifier, the drainage rate of wastewater is low, and water resources are saved; and meanwhile, the filter element is convenient and fast to replace, so that the ion exchange technology based energy-saving water purifier is worthy of popularization.

The invention discloses a whole-process automatically controlled electrolytic manganese wastewater ion exchange treatment system. A water outlet of a wastewater storage tank (4) is connected with lower liquid accesses of an ion exchanger A (1) and an ion exchanger B (2) respectively, a water outlet of a regenerated liquid distribution tank (3) is connected with an upper liquid accesses of the ion exchanger A (1) and the ion exchanger B (2) respectively, the lower liquid access and the upper liquid access of the ion exchanger A (1) are also connected with a drainage port A (7) respectively, the lower liquid access and the upper liquid access of the ion exchanger B (2) are also connected with a drainage port B (10) respectively, and an electric valve is arranged on a pipeline and electrically connected with a PLC (programmable logic controller). The system has the beneficial effects that the PLC control program automatically runs in the whole process, so that the automation degree of equipment is improved, and the running efficiency of the system is improved; the two ion exchangers arranged in parallel ensure continuous adsorption of the equipment.

The invention discloses a membrane-method salt separation resourceful treatment system for high-salinity wastewater in the petroleum refining industry. The system comprises an efficient sedimentationtank, a tubular ultrafiltration system, an ion exchange system, a first-stage reverse osmosis system, an A/O + MBR device, a first-stage nanofiltration system, a second-stage nanofiltration system, asecond-stage reverse osmosis system, a high-valence salt evaporation crystallizer, a low-valence salt evaporation crystallizer and a miscellaneous salt evaporation crystallizer. The system employs thetwo-stage reverse osmosis system, a two-stage nanofiltration system and an A/O + MBR device as main treatment units, and a pretreatment process and an evaporative crystallization technology are combined to form a membrane-method salt separation resourceful treatment process for high-salinity wastewater in the petroleum refining industry, so that the defects that the high-salinity wastewater in the petroleum refining industry is difficult to resist impact of organic matters and poor in salt separation effect and a high-grade industrial-level product is difficult to product can be solved; besides, zero emission and resource utilization of high-salinity wastewater in the petroleum refining industry are achieved, and the recovery rate is increased.

The invention discloses an electroplating wastewater treatment process applied to circuit boards and an electroplating wastewater treatment system. The electroplating wastewater treatment process includes the following steps: the production workshop obtains "copper-containing wastewater" during the electroplating process; injects the "copper-containing wastewater" into the "wastewater collection pool"; adjusts the pH value of the "copper-containing wastewater"; Wastewater" is pre-treated to remove suspended solids and organic matter; ion exchange treatment is performed on "copper-containing wastewater"; reverse osmosis treatment is performed on "copper-containing wastewater"; the concentrated water obtained from reverse osmosis treatment flows into the "heavy metal collection The reused water obtained by infiltration treatment flows back into the production workshop. An electroplating wastewater treatment process applied to circuit boards and an electroplating wastewater treatment system of the present invention, through the improvement of the process method and treatment system, can effectively treat the wastewater generated during the electroplating process of printed circuit boards .

Application of brine to boiler softened water in stead of industrial salts comprises sodium hydroxide, a brine storage tank A, a precision filter, a brine storage tank B, an electromagnetic valve, a delivery pump and an ion exchanger. The sodium hydroxide is connected to the brine storage tank A which is connected to the precision filter; the precision filter is connected to the brine storage tank B; the brine storage tank B is downwards connected to the electromagnetic valve; the electromagnetic valve is downwards connected to the delivery pump; and the delivery pump is downwards connected to the ion exchanger. The ion exchanger sends out a control signal which is connected to the delivery pump and the electromagnetic valve simultaneously. According to the invention, brine is taken as a regenerant in stead of the industrial salts and used as the regenerant for the ion exchanger; and as brine can cause influence on resins in use since containing few ions of calcium, magnesium and iron, the sodium hydroxide is firstly added to the brine storage tank to adjust the PH value to about 9 before use. The application of the brine is simple in integrated process, convenient for operation and use, good in stability and high in reliability; and the fault rate of equipment is greatly reduced.