16results about How to "High separation factor" patented technology

The application provides a preparation method of Zr-BDC film and application of the Zr-BDC film in separation of organic matters. The application directly uses zirconium propoxide as the only zirconium source in a mother liquor, and continuously synthesizes Zr-BDC film through a solvothermal method; the content of the metal source in the mother liquor is extremely low, so that the film thickness is still thin after three times of solvothermal growth, and the preparation of a high-flux film is facilitated. The application uses a ligand / metal molar ratio of up to 20, and provides application of the Zr-BDC film with less defect sites in separation of MeOH / MTBE. The Zr-BDC film prepared by the application exhibits optimal separation performance of MeOH / MTBE, and when 5wt.% MeOH / MTBE is separated at 40 DEG C, the film flux can reach 5.68kg·m ‑2 ·h ‑1 -1h-1, the separation factor is up to 25802, and the operation stability is greater than 5 days.

The invention relates to a solvent extraction method for improving a separation factor of trivalent americium and curium, which comprises the following steps: preparing an extraction organic phase solution containing an extraction agent and a synergistic extraction agent, the extraction agent being dithiophosphonic acid with long chain hydrocarbon substituents on two substituted benzene rings on phosphorus atoms; then co-extracting Am (III) / Cm (III) by using an extraction organic phase solution; carrying out selective reverse extraction on Cm (III) by adopting a water-phase solution containing a water-soluble complexing reverse extraction agent; and finally, carrying out primary reverse extraction on the residual Am (III) in the organic phase by using HNO3. According to the method provided by the invention, the separation factor of the trivalent americium and curium is increased from about 4 to more than 10, so that the separation factor of the americium and curium is greatly increased. Compared with the prior art, the extraction agent adopted in the method is higher in stability, the separation factor of americium and curium is high, and separation of trivalent actinide lanthanum and americium and curium can be achieved in one extraction and separation process in a synergistic extraction and complexing reverse extraction mode.

The invention provides an antimony soot arsenic-antimony separation method based on a TBP and TOA synergistic extraction system, and relates to the technical field of solid waste metal recovery technologies. An antimony soot arsenic and antimony separation method based on a TBP and TOA synergistic extraction system comprises the following steps that S1, hydrochloric acid lixivium pretreatment and raw material treatment are conducted, antimony soot is leached through hydrochloric acid, and after solid-liquid separation is conducted, acid lixivium is obtained; s2, preparing a mixed extraction agent; s3, countercurrent extraction separation; s4, carrying out reverse extraction on the loaded organic phase to recover arsenic; and S5, treating the raffinate to recover antimony. The As (III) / Sb (III) mixed solution is directly treated without oxidation / reduction pretreatment; the arsenic-antimony separation coefficient is greatly improved through the synergistic effect of the extraction agent; the reagent loss and wastewater discharge are reduced, and the industrial continuous production requirement is met.

This invention relates to the field of food filtration technology and discloses a mango juice black spot filtration device and its filtration method. The device includes a frame, a motor fixedly connected to one side of the top of the frame, an organic housing fitted and fixedly connected to the inner wall of the top of the frame, a rotating shaft fixedly connected to the output end of the motor, and a belt fitted and rotatably connected to the outer wall of the rotating shaft. It also includes a black spot filtration mechanism, comprising a drive shaft rotatably connected to the inner wall of the belt at the end away from the rotating shaft. One end of the drive shaft passes through the housing and extends to the outside of the housing. A feed pipe is connected to the top of one side of the housing. During debugging, the residence time of the material in the nylon filter screen can be increased by adjusting the angle of the brush, thereby increasing the output. Furthermore, appropriately increasing the frequency of the inverter can improve the separation factor, increase the centrifugal force of the material, and increase the throughput of the nylon filter screen, thus further increasing the output. Adjusting the angle of the frame makes it easier to discharge the black spots.

The invention belongs to the technical field of novel separation membrane materials, and discloses an ionic covalent organic framework membrane as well as a preparation method and application thereof. An amine monomer and an aldehyde monomer are respectively dissolved in water and an organic solvent, and the continuous defect-free ionic covalent organic framework membrane is formed by in-situ growth on the surface of a carboxylated porous support base membrane through a limited interface polymerization method. And the membrane structure and the separation performance can be optimized by regulating and controlling the monomer concentration and the reaction time. The preparation process is simple, convenient and controllable, the prepared membrane is applied to pervaporation butanol-water separation, high permeability and high selectivity are shown, and good long-term operation stability is achieved. In addition, the prepared membrane can also be applied to separation of other types of alcohol-water and separation of pervaporation salt-water, and has good universality application.

The application discloses a liquor tailing acid substance extraction method in liquor brewing and liquor, and comprises the following steps of pretreatment, selective adsorption, gradient desorption, membrane separation and purification and liquor body blending. The chelation precipitation-microfiltration coupling process is adopted in the pretreatment to remove metal ions and colloidal impurities; the acid substances are specifically adsorbed through a hexanoic acid molecular imprinting polymer adsorbent, and step-by-step elution is realized by combining with gradient pH desorption; high-purity acid concentrated solution is obtained through nanofiltration membrane separation and activated carbon adsorption, and after screening, the high-purity acid concentrated solution is blended with a base liquor body to improve the quality of the liquor.

This invention discloses a method for separating vanadium and chromium in a vanadium-chromium solution, belonging to the field of wet separation of vanadium-chromium solutions. This method addresses the problem that existing technologies cannot achieve deep separation of vanadium and chromium. The method first adds a reducing agent to the vanadium-chromium solution, converting the highly soluble hexavalent chromate anion into a lower valence state, easily precipitated Cr. 3+ Cations, then add Mn 2+ The chromium removal agent efficiently precipitates trivalent chromium ions from vanadium-containing solutions, achieving deep separation of vanadium and chromium in the liquid phase. Compared with traditional chemical precipitation methods, the vanadium-chromium separation method of this invention has advantages such as high separation coefficient, simple and easy-to-use process, low equipment requirements, convenient operation, and suitability for industrial production.

The invention belongs to the technical field of chemical separation, and particularly relates to a binder-free copper molecular sieve adsorbent and a preparation method thereof. Mixing clay, a molecular sieve, cuprous chloride and a bonding aid to prepare a raw powder material; taking part of the raw powder material, adding water for mixing and kneading, granulating by adopting a strip extruding and granulating integrated machine, then placing the granules in a ball rolling machine for rolling and pelletizing, adding the raw powder material in the ball rolling process for rolling and growing, and drying and roasting to prepare spherical adsorbent precursor granules; and finally, carrying out ion exchange on the adsorbent precursor particles by using a cuprous salt solution, and drying and roasting to prepare the binder-free copper molecular sieve adsorbent. The adsorbent is spherical particles, the problem of pulverization caused by strip-shaped particle sections is solved, the adsorbent is high in strength and resistant to scouring, the binder is free of binder after being subjected to ion exchange through cuprous chloride, and the active component cuprous chloride is good in stability; the adsorbent is large in adsorption capacity, simple in preparation method and suitable for large-scale industrial production.

The present invention discloses a method for preparing a two-dimensional material composite proton exchange membrane for hydrogen isotope separation, comprising the following steps: (1) preparing a PFSA type polymer solution; (2) preparing a nanosheet dispersion; (3) preparing a composite proton exchange membrane: adding the nanosheet dispersion to the PFSA type polymer solution, mixing evenly, pouring the nanosheet dispersion into a mold under heating conditions and standing to form a membrane, finally cooling to room temperature, and taking out the formed membrane, which is the two-dimensional material composite proton exchange membrane for hydrogen isotope separation. The two-dimensional material composite proton exchange membrane prepared by the present invention has good mechanical properties and hydrogen isotope screening ability, and can be applied to a proton exchange membrane (PEM) electrolyzer to significantly reduce the energy consumption of electrolytic separation of protium and tritium, and improve the protium and tritium separation coefficient.

The invention provides an ionic liquid-covalent organic framework with a positive local electric field as well as a preparation method and application of the ionic liquid-covalent organic framework in carbon capture, and belongs to the technical fields of composite material preparation, carbon capture and mixed matrix membrane preparation. The ionic liquid-covalent organic framework composite material is prepared on the basis of host-guest interaction between ionic liquid and a covalent organic framework; in the composite material, bromide ions in the imidazolyl ionic liquid are more likely to be combined with methoxyl groups in the covalent organic framework through non-covalent interaction, so that the ionic liquid is confined in pore channels of the covalent organic framework; the ionic liquid-covalent organic framework composite material can be used as a filler to prepare a mixed matrix membrane, the preparation process of the mixed matrix membrane is simple, the reaction is controllable, the raw materials are cheap and easy to obtain, the conditions are mild, and the ionic liquid-covalent organic framework composite material has good application in carbon capture, especially separation of CO2 / CH4, CO2 / N2 and CO2 / H2 mixed gas.

The invention discloses a metal organic framework composite membrane for helium and methane mixed gas separation and a preparation method and application thereof. The metal organic framework composite membrane comprises a porous base membrane and a metal organic framework ZIF-8 membrane layer arranged on at least one surface of the porous base membrane, the metal organic framework ZIF-8 film layer is formed by self-assembling metal ions and imidazole ligands on the surface of the porous base film, and the imidazole ligands comprise 2-methylimidazole and other imidazole ligands; the other imidazole ligands are benzimidazole substituted by alkyl and / or halogen. The invention further provides a method for preparing the composite membrane through diffusion growth. The metal organic framework ZIF-8 prepared through the method is continuous and compact in membrane layer, stable in structure and high in permeation capacity. The metal organic framework composite membrane is used for separating helium and methane mixed gas, the helium permeation flux can reach 700 * 10 <-9 > mol m <-2 > s <-1 > Pa <-1 > or above, the separation selectivity reaches 280, and meanwhile the helium permeation flux is not lower than 100 * 10 <-9 > mol m <-2 > s <-1 > Pa <-1 >.

The invention relates to the field of hydrometallurgy, and particularly discloses a method for efficiently extracting lithium from a lithium-containing mother solution under the catalysis of carbon dioxide without alkali consumption, which comprises the following steps: S1, introducing carbon dioxide into the lithium-containing mother solution to adjust the pH value of the lithium-containing mother solution; s2, mixing a polyfluoro-substituted diketone extraction agent, a synergistic extraction agent and a diluent to prepare an extraction agent; s3, mixing the prepared extracting agent with the lithium-containing mother liquor with the adjusted pH value, and extracting according to a certain phase ratio to obtain raffinate and loaded organic matter; carrying out washing and reverse extraction on the loaded organic matter to obtain lithium-containing reverse extraction liquid; and S4, preparing battery-grade lithium sulfate or battery-grade lithium hydroxide or battery-grade lithium carbonate. The method adopts carbon dioxide to adjust pH, does not need to consume a large amount of acid and alkali, can prepare high-purity battery-grade lithium carbonate or lithium hydroxide monohydrate and battery-grade lithium sulfate products by recycling carbon dioxide generated in the extraction process, and has the advantages of easy control, simple operation, short process flow and high lithium recovery rate of the whole extraction system. The method has breakthrough significance in the battery recovery industry.

The application discloses an extraction solvent and an extraction method for stepwise recovery of vanadium and chromium in a solution by steric hindrance effect of an amide extractant, wherein the extraction solvent is composed of extraction solvent A and extraction solvent B; the extraction solvent A is composed of a large steric hindrance amide extractant and diluent A; the extraction solvent B is composed of a small steric hindrance amide extractant and diluent B; the large steric hindrance amide extractant and the small steric hindrance amide extractant are both alkyl-substituted amide extractants; and the diluent A and the diluent B are both inert organic solvents. The steric hindrance effect of the amide extractant in the extraction solvent is utilized to stepwise recover vanadium and chromium in the solution, and high-purity chromium-containing stripping liquid and vanadium-containing stripping liquid are obtained, which has the advantages of high extraction rate, high separation coefficient, high product purity, fast extraction kinetics, good regeneration of the extraction solvent and green harmlessness.

The present invention discloses a gel polymer electrolyte membrane for lithium isotope separation, and its preparation method and application. The preparation method comprises: fully mixing a polymer monomer, an ionic liquid, a first chelating agent, an initiator and a cross-linking agent, and then heating and reacting in a vacuum to obtain a gel polymer electrolyte membrane for lithium isotope separation; wherein the first chelating agent comprises any one of benzoquinoline, 10-hydroxybenzoquinoline, 4-methyl-10-hydroxybenzoquinoline, 3-methylbenzoquinoline, 8-hydroxybenzoquinoline, 1-(phenylazo)-2-naphthol, 1-[(2,4-xylyl)azo]-2-naphthol, or a combination of two or more thereof. The enriched 7 Li + The gel polymer electrolyte membrane can make 6 Li + can freely penetrate the membrane; at the same time, the present invention combines electromigration technology with membrane separation technology to improve 6 Li + / 7 Li + The separation factor can achieve the separation and enrichment of lithium isotopes.

This application belongs to the field of hydrometallurgical technology, specifically relating to an efficient method for recovering molybdenum during the sulfuric acid-enhanced decomposition of tungsten ore. The method includes the following steps: S1, obtaining tungsten ore, mixing it with concentrated sulfuric acid, and roasting it to obtain a roasting product. The roasting product, by mass percentage, includes: WO3: 10%-60%, Mo: 0.01%-5%; S2, mixing the roasting product with acidic washing liquid to obtain a first mixture. Under stirring conditions, a selective complexing agent is added to the first mixture to induce a complexation reaction, resulting in a second mixture. The second mixture is then subjected to solid-liquid separation to obtain a solid slag and a complexing liquid. The selective complexing agent includes at least one of thiourea and its derivatives or sulfur-containing organic compounds; S3, recovering molybdenum from the complexing liquid. This application, by introducing selective complexation during the washing stage, enriches the complexing liquid with over 98.5% of the molybdenum, while the residual rate of tungsten in the complexing liquid is ≤0.01%, thus solving the problem of molybdenum dispersion and loss in the slag phase and washing water.