399 results about "Re crystallization" patented technology

The invention provides a method for preparing FAPbBr3 quantum dots, which comprises the following steps: S1, preparation of a precursor solution: respectively dissolving a lead source precursor, a bromine source precursor and acid in water and stirring to obtain the precursor solution; s2, formation of nucleation sites: adding an FA precursor into the precursor solution prepared in the step S1, stirring, and reacting and crystallizing in water to form floccules capable of being used as the nucleation sites; s3, construction of a substrate layer: adding silane into the solution prepared in the step S2, stirring, heating and drying to obtain a FAPbBr3-coated SiO2 quantum dot crude product, and coating the exterior of FAPbBr3 with SiO2 generated by hydrolysis of the silane in an acidic solution to serve as the substrate layer; s4, ball-milling recrystallization: carrying out ball-milling recrystallization on the FAPbBr3-coated SiO2 quantum dot crude product prepared in the step S3; wherein the object of ball milling is a substrate layer, and the object of recrystallization is FAPbBr3 quantum dots. The solvent of the system is an aqueous solution, so that the problems of recycling, discharging and the like of organic solvents are solved.

The invention belongs to the technical field of forest chemical industry and natural perfume extraction and separation, and particularly discloses a superheated steam distillation separation and recovery method for perfume components in cinnamon oil rectifying still residues. The method comprises the following steps: processing the cinnamon oil rectifying still residues by adopting a steam distillation method taking normal-pressure superheated steam as a desorption medium, carrying out condensation cooling and phase separation on distilled oil-water mixed gas, and collecting oily liquid or crystalline solid containing cinnamon spice components, and carrying out one or more physical isolation methods such as freezing crystallization, vacuum fractionation or rectification, recrystallization and the like to obtain natural cinnamon monomer spices such as o-methoxycinnamaldehyde, o-methoxycinnamic acid, phenethyl alcohol and the like. The method has the advantages of low equipment investment, simple and feasible operation, low production cost, clean and pollution-free process, good operation safety, high industrial application feasibility and the like.

The invention belongs to the technical field of chemical synthesis, and relates to a method for continuously synthesizing 4-bromo-2-p-chlorophenyl-5-trifluoromethyl pyrrole-3-nitrile by a microchannel reactor, which comprises the following steps: pumping a substrate solution to a first plate type micro-reaction module; respectively pumping the bromination reagent solution to a first plate type micro-reaction module, a second plate type micro-reaction module and a third plate type micro-reaction module to obtain a reaction base solution; the reaction base solution is introduced into a fourth plate type micro-reaction module, n-heptane is pumped to the fourth plate type micro-reaction module and a fifth plate type micro-reaction module, deionized water is pumped to the fourth plate type micro-reaction module and the fifth plate type micro-reaction module, and extract liquor is obtained; and carrying out separation, evaporation recovery and recrystallization to obtain a finished product. Through the multi-stage series design of the micro-channel reactor, catalytic bromination replaces traditional bromine oxidation and reaction-extraction in-situ integration, and the three major problems of low efficiency, serious pollution and poor safety of an intermittent process are solved.

The invention provides a bio-based crude terephthalic acid hydrofining method, and belongs to the technical field of terephthalic acid hydrofining. The method comprises the following steps: carrying out recrystallization pretreatment on bio-based crude terephthalic acid, mixing the pretreated bio-based crude terephthalic acid with a solvent, adding a catalyst, carrying out a hydrofining reaction, replacing the solvent after the reaction is finished, carrying out recrystallization treatment on a hydrofined product, washing with water, and drying to obtain refined terephthalic acid, the method disclosed by the invention has the advantages of high impurity removal rate, mild reaction conditions and small process pollution, the refining of the bio-based crude terephthalic acid is realized, the obtained terephthalic acid can meet the requirements of an existing industrial method, and the concentration of impurities p-carboxybenzaldehyde is less than or equal to 25ppm and the concentration of methyl benzoic acid is less than or equal to 180ppm.

The invention relates to a synthesis process of an omarigliflozin intermediate, and belongs to the technical field of drug synthesis, one-step efficient conversion is adopted in the process of synthesizing the omarigliflozin intermediate, p-bromophenylhydrazine hydrochloride is used as a starting raw material, and a target product is obtained through indole cyclization, alkali precipitation and acidification crystallization. Toluene plays a role in cyclization and dehydration in a high-temperature reflux process, in a purification process of alkali precipitation and acidification crystallization, a sodium hydroxide aqueous solution is utilized to hydrolyze and convert a product into water-soluble sodium salt, the water-soluble sodium salt enters a water phase, a toluene layer containing a large amount of organic impurities and the water phase are layered in a standing and layering process, and the organic impurities in the toluene layer are removed; the preparation method comprises the following steps of: preparing a sodium salt, acidifying in a water phase by using hydrochloric acid, changing the sodium salt form of the product into an acid form, and crystallizing from the water phase, which is equivalent to recrystallization purification, so that the prepared product has higher purity, the purity is stabilized at 98% or above, and the purity of the product can meet the quality standard of medical intermediates.

The invention relates to a method for purifying an electronic-grade sulfonium salt photoacid generator. The method comprises the following steps: heating, preparing a photoacid generator stock solution, purifying through ion exchange resin, cooling, recrystallizing, carrying out solid-liquid separation, washing crystals and the like to obtain the high-purity photoacid generator, so that the metal content in the photoacid generator can be effectively reduced, the single metal content is less than 5ppb, and the yield is up to 80-90%. And mother liquor is collected and purified by resin and can be used for preparing photoacid stock solution again. The operation effectively reduces the use of an organic solvent and the generation of wastewater, can further improve the recrystallization yield, and meets the requirements of green and sustainable development.

The invention discloses a preparation process of high-purity dotenorad, and belongs to the technical field of organic synthesis route design and raw material medicine and intermediate preparation. Benzothiazole is used as a starting material, reduction, acylation, amide condensation, oxidation, demethylation and other reactions are sequentially carried out, a dotenorad crude product is synthesized, and the required crystal form is obtained through recrystallization. The raw materials of the preparation method are cheap, easy to obtain and high in stability, the defect that the raw materials of other preparation processes are poor in stability is overcome, and the preparation method is convenient to operate and suitable for industrial production; the total yield of the prepared dotenorad in each step is 66.80%, and the purity of the dotenorad can reach 99.99%.

The invention belongs to the technical field of food processing, and particularly relates to a preparation method and application of resistant starch. By optimizing drying process parameters (temperature, humidity control and the like), the damage of spray drying (high-temperature hydrogen bond damage), vacuum freeze drying (water loss of a crystal channel caused by sublimation of ice crystals) and traditional hot air drying (untimely loss of bound water caused by unregulated moisture distribution) to the starch double-helix structure in the prior art is effectively avoided. By maintaining a moisture environment required by recrystallization of starch molecules, ordered arrangement of starch chains is promoted, the relative crystallinity of the resistant starch is remarkably improved, and the problems of incomplete crystal structure and limited digestion resistance caused by an existing drying process are solved; and a key technical support is provided for large-scale application in the fields of baked foods, meal replacement products, pharmaceutical preparations and the like.

To provide a method for manufacturing a graphite crucible hard to be exhausted even when put at high temperature.SOLUTION: A method for manufacturing a single crystal growth graphite crucible, capable of growing the single crystal on the main surface of a seed crystal substrate by a sublimation recrystallization method comprises: the molding step of molding a raw material including coke mainly constituted of needle coke and binder pitch; the calcination step of calcining the molded molding to obtain a calcined product; the first impregnation calcination step of performing the impregnation and calcination of additional binder pitch once or more to the calcined product to obtain an impregnation calcination product; the graphitization step of heating and graphitizing the impregnation calcination product at 2000°C or more to obtain a graphitization product; and the second impregnation calcination step of performing the impregnation and calcination of additional binder pitch once or more to the graphitization product.SELECTED DRAWING: Figure 1

The invention discloses a treatment method of electroplating wastewater, and belongs to the technical field of electroplating wastewater treatment. The process comprises the following steps: electrically adjusting the pH value of the electroplating wastewater to 2.5-4.0, adding ferrite, adopting a Ti / PbO2 anode and a graphite cathode, controlling the current density to 15-30mA / cm, introducing air, reacting for 40-80 minutes, and adjusting the pH value to 6.0-7.0 after the reaction; introducing the wastewater into a chelating resin column, wherein the chelating resin is an amino phosphonic acid type or iminodiacetic acid type; the method comprises the following steps of: introducing into a built-in filter column, loading two layers of recrystallized silicon carbide honeycomb ceramic membranes in the filter column in parallel, performing cross-flow filtration under the conditions that the operation pressure is 0.8-2.0 MPa, the temperature is 25-40 DEG C and the cross-flow velocity is 1.5-3m / s, and collecting permeate; the permeate liquid is used for backwashing every 8-12 hours of operation. According to the method, heavy metal ions in the electroplating wastewater can be effectively removed, and the treatment efficiency of the electroplating wastewater is improved.

The invention discloses a ferrocene-based D-A type multi-system conjugated small molecule synthesis method, which comprises: carrying out a heating reaction in an organic solvent by using a ferrocenyl compound and a bromophenyl compound as raw materials and using a palladium complex as a catalyst, and after the reaction is completed, carrying out extraction, column chromatography and recrystallization to prepare an intermediate; the obtained intermediate and a 4-pyridine boric acid compound are used as raw materials, a palladium complex is used as a catalyst, a heating reaction is conducted in an organic solvent, and after the reaction is finished, cooling, extraction, column chromatography and recrystallization are conducted to prepare the D-A type multi-system conjugated small molecules. The invention also discloses a memory device with a sandwich structure and application of the memory device to ultra-high density information storage. The small molecular material prepared by the invention not only can realize ternary information storage performance, but also greatly improves the stability of the device through stable redox cycle of the ferrocene group, and realizes long-time stable ultrahigh-density information storage.

The invention relates to an oil-water separation membrane as well as a preparation method and application thereof, and belongs to the field of gas field brine pretreatment. The oil-water separation membrane comprises a nanofiber membrane substrate and an MOFs layer loaded on at least part of the surface of the nanofiber membrane substrate, and the MOFs layer comprises two-dimensional MOFs nanosheets; the nanofiber membrane substrate is prepared by performing electrospinning on three-dimensional MOFs and an organic polymer; the two-dimensional MOFs nanosheet is obtained by secondary growth on the surface of the nanofiber membrane substrate through hydrothermal recrystallization. The oil-water separation membrane can be used for efficiently separating petroleum pollutants and solid suspended matters in the oil and gas field produced wastewater, and can be coupled with an advanced oxidation process based on sulfate free radicals to realize synchronous and efficient removal of oil, suspended particles and organic matters in the oil and gas field produced wastewater.

The invention relates to the technical field of food freezing, and discloses a composite refrigerating fluid for rapid steeping and freezing of beefsteak, and the core of the technical scheme is that the refrigerating fluid comprises the following components in percentage by weight: 20-30% of L-proline, 0.01-0.05% of nano silicon dioxide, 5-10% of sodium chloride, 5-10% of propylene glycol and the balance of water. The innovation mechanism of the invention lies in the synergistic effect of the four components: sodium chloride and propylene glycol construct an efficient heat transfer basis capable of maintaining a liquid state at a cryogenic temperature; the nano silicon dioxide is used as a uniformly dispersed ice nucleating agent, a large number of fine ice crystals are formed on the surface of the beef steak and in the refrigerating fluid through induction, and the macroscopic heat conduction efficiency is improved, so that quick freezing is realized; the core component L-proline is used as an efficient cryoprotectant, and is combined with water molecules to form a glassy network, so that growth and recrystallization of ice crystals in the freezing process are effectively inhibited, and the integrity of a muscle cell structure is protected.

The invention relates to a continuous production method of ultra-pure 2, 3, 4, 4 '-tetrahydroxybenzophenone, which comprises the following steps: completely dissolving p-hydroxybenzoic acid in high-boiling range petroleum ether, and completely dissolving pyrogallic acid in the high-boiling range petroleum ether; the preparation method comprises the following steps: adding a p-hydroxybenzoic acid solution and a pyrogallic acid solution into an ultra-pure continuous reactor group, adding boron trifluoride diethyl etherate into the ultra-pure continuous reactor group at a flowing speed, reacting at 110-140 DEG C, adding the obtained reaction solution into the next ultra-pure continuous reactor group, stirring in ice water, filtering, washing and recrystallizing to obtain the 2, 3, 4, 5-tetramethyl-3, 5-dihydroxybenzoic acid. According to the present invention, the reaction time is substantially shortened, the conversion rate is 70-80%, the purity of the obtained electronic product is more than or equal to 99.2%, the content of the metal ions such as sodium, aluminum, copper, iron, calcium, zinc and boron is less than or equal to 60 ppb, the reaction materials, the reaction temperature and the reaction rate are controllable, the reaction is sufficient, the yield of the obtained target product is stable, and the method can be used for continuous production.

The application belongs to the technical field of medicine synthesis and provides a preparation method of phosphonic acid levomoxiflazine disodium, which comprises the following steps: taking levomoxiflazine as raw material, performing esterification through phosphorus oxychloride and hydrolysis to obtain a reaction solution containing phosphonic acid levomoxiflazine; slowly and uniformly adding a sodium hydroxide methanol solution, first adjusting pH to 6.3-7.6, filtering out impurities, then adjusting pH to 9.1-9.8, crystallizing and drying to obtain a crude product; and performing recrystallization through a water-ethanol-acetone mixed system, filtering and drying to obtain a high-purity product. The application solves the problems of high impurity content and low yield in the prior art by optimizing the amount of esterification reagent, the pH adjustment mode and the recrystallization system, the HPLC purity of the obtained phosphonic acid levomoxiflazine disodium is greater than or equal to 99.97%, the maximum single impurity content is less than or equal to 0.02%, the process is simple, easy to operate, stable and suitable for industrial amplification production.

This invention relates to the field of hydrometallurgical technology and discloses a method for purifying and recovering ammonium perrylate using a combination of electrodialysis and ion exchange. The method first adjusts the pH of the rhenium-containing feed solution, then selectively enriches perrylate ions using electrodialysis to obtain a high-concentration rhenium-rich solution. Subsequently, the rhenium-rich solution is subjected to deep adsorption purification through an anion exchange column. Next, rhenium is eluted from the saturated resin using an eluent to obtain a pure ammonium perrylate solution. Finally, high-purity ammonium perrylate crystals are obtained through evaporation, concentration, cooling, crystallization, and drying. Optionally, the obtained crystals can be recrystallized to further improve purity. This invention ensures the purity and process stability of the rhenium-rich solution obtained in the pre-enrichment stage, improves the overall adsorption capacity, desorption rate, and reliability of the process operation of the resin, and guarantees the stability of the final ammonium perrylate product purity and the economic benefits of the entire process recovery.

The invention discloses a powdery emulsion explosive with eutectic inorganic salt as an internal phase and a preparation method, and relates to the technical field of powdery emulsion explosives, the powdery emulsion explosive comprises the following raw materials by weight: 90-110 parts of eutectic inorganic salt and 5-7 parts of a composite oil phase; wherein the eutectic inorganic salt is prepared by recrystallizing ammonium nitrate and sodium chloride. Ammonium nitrate and sodium chloride are combined in a recrystallization manner, so that sodium chloride is uniformly distributed in ammonium nitrate crystals in a lattice doping manner, a molecular-level dispersion effect is realized, and the flame inhibitor is more uniformly dispersed in an inner phase; secondly, the eutectic inorganic salt has a synergistic decomposition peak at 210-240 DEG C, and chloride ions are released in advance to interact with active groups generated by explosion; under the combined action of the two factors, sodium chloride is used as a flame inhibitor to play a role more effectively at the flame front, the flame temperature is reduced, and flame propagation is inhibited.

The invention relates to the technical field of industrial wastewater treatment, in particular to a treatment method for treating high-sulfonic-group wastewater by advanced oxidation, which comprises the following steps: regulating the pH value of the wastewater to 3.0-4.0, then carrying out photo-Fenton oxidation, controlling the molar ratio of H2O2 to Fe < 2 + > to be 300: 1-400: 1, regulating the pH value of the effluent to 5.0-6.0, adding sodium sulfite to quench residual H2O2 and flocculate and precipitate iron mud, and finally, carrying out secondary oxidation on the wastewater to obtain the high-sulfonic-group wastewater. Performing anaerobic-aerobic biochemical treatment on the supernate, adding sodium carbonate and sodium hydroxide into biochemical effluent to soften and descale, concentrating in a mechanical vapor recompression evaporator, washing and recrystallizing crystallized mother liquor, and adsorbing and purifying the crystallized mother liquor with activated carbon to obtain an industrial salt product. The problem of MVR evaporation scaling is effectively solved by accurately controlling the neutralization pH and combining the softening step, finally, wastewater standard treatment and salt high-quality recovery are achieved, the COD removal rate can reach 95% or above, and excellent environmental and economic benefits are achieved.

A recovery system for preparing magnesium sulfate using sulfuric acid waste liquid is provided. [Solution] The recovery system for preparing magnesium sulfate using sulfuric acid waste liquor according to the present invention comprises a reactor 1, a crystallizer 3, a dehydrator 4, and a dryer 5. The reactor 1 removes hydrogen peroxide from the sulfuric acid waste liquor and produces a magnesium sulfate solution. The crystallizer 3 continuously recrystallizes the magnesium sulfate solution by lowering its temperature, obtaining magnesium sulfate crystals and their mother liquor. The dehydrator 4 removes the mother liquor, and the dryer 5 dries the solution at different temperatures to obtain magnesium sulfate hydrates containing different amounts of water of crystallization.

The invention belongs to the technical field of biochemical engineering, and relates to an industrial extraction method and application of L-hydroxyproline adapted to the scale of a 30T fermentation tank, and the extraction method comprises the following steps: preparing raw materials; recycling membrane filtration and mother liquor; decoloring is performed; decarburization; evaporating, concentrating and crystallizing; performing centrifugal separation; drying and crushing. The method solves the technical problems that the yield is low (generally less than 70%), the process flow is long (multiple times of chromatography / recrystallization is needed), the product purity is difficult to reach the standard (most 98-99.5%) and the like, the L-hydroxyproline fermentation liquor produced by a 30T fermentation tank is used as a treatment object, efficient extraction is realized through a pretreatment-purification-refining three-stage process system, and the method is suitable for industrial production. According to the method, the primary mother liquor generated by centrifugal separation is innovatively applied to the next batch of membrane filtration process, so that raw material recycling is realized, the purity of the final product stably reaches 99.9%, the overall yield is increased to 75%, and the method has the advantages of simplified process, stable yield and controllable quality, and can be directly applied to large-scale industrial production of L-hydroxyproline.

The application discloses a production system of o-nitrobenzenesulfonyl chloride, which comprises an etherification reaction kettle, a material transfer structure, a recrystallization pool, a separation mechanism and a chlorination reaction kettle. The material transfer structure comprises a rotary driving mechanism, a rotating disc and a charging disc. A plurality of rotating rods are fixedly connected to the rotating disc. The bottom of the charging disc is provided with a filter screen. A filtering station, a recrystallization station, a first drying station, a chlorination station, a second drying station and a discharging station are sequentially arranged around the rotating disc. The recrystallization pool is located directly below the recrystallization station. Drying boxes are respectively arranged below the first drying station and the second drying station. The chlorination reaction kettle is located directly below the chlorination station. The production system of o-nitrobenzenesulfonyl chloride realizes continuous and automatic production of o-nitrobenzenesulfonyl chloride through the arrangement of the recrystallization station and the multiple chlorination stations, guarantees the purity and yield of the product and improves the production efficiency.

The present application relates to the technical field of wastewater treatment, and specifically discloses a method for recycling fluorine from copper smelting flue gas, which comprises the following steps: adding water glass with a certain concentration into flue gas scrubbing liquid in a certain proportion, obtaining waste acid original solution by power wave scrubber, adding potassium permanganate into the waste acid original solution, obtaining transformation slag and post-transformation liquid, adding water and alkaline compounds into the transformation slag for hydrolysis, obtaining neutralization liquid, adding oxidizing agent and reducing agent into the neutralization liquid, obtaining purification slag and post-purification liquid, obtaining crude potassium fluoride crystal by concentrating and crystallizing the post-purification liquid, and obtaining refined potassium fluoride crystal and post-recrystallization liquid by recrystallizing the crude potassium fluoride crystal. The method can recycle most of the fluorine-containing pollutants in the copper smelting flue gas, and convert them into potassium fluoride, an important industrial product, which not only solves the corrosion of fluorine to process equipment and the pollution to the environment, but also greatly improves the economic benefits of enterprises.

This invention provides a method for recovering and utilizing distillation residue after solvent removal from homohydric anhydride, relating to the field of fine chemical technology. The method includes anhydride treatment, vaporization and sublimation, dissolution and recrystallization, distillation, and water washing. In this invention, the distillation residue is anhydride-treated under high temperature and negative pressure, followed by vaporization and sublimation under vacuum to separate mechanical impurities and high-boiling substances. Then, through dissolution and recrystallization, the difference in solubility between homohydric anhydride and metahydric anhydride in polar solvents is utilized to preferentially crystallize out the homohydric anhydride. The mother liquor is distilled to remove the solvent, and then colored impurities are removed by hot water washing and activated carbon adsorption. Finally, it is cooled and crystallized to obtain trimellitic acid. The homohydric anhydride obtained by this invention has a purity ≥95% and a yield of 84-89%, and the trimellitic acid has a purity ≥97% and a yield of 81-86%. This method achieves effective recovery of high-value-added components from distillation residue, demonstrating significant economic and environmental benefits and promising application prospects.

The invention discloses a perovskite light absorption layer penetrating through large crystal grains and preparation and application thereof, and a preparation method comprises the following steps: K1, obtaining a perovskite thin film with multiple layers of crystal grains; k2, treating the perovskite thin film in an anti-solvent / solvent co-evaporation atmosphere; and K3, annealing the processed perovskite thin film in an inert atmosphere to obtain the perovskite light absorption layer penetrating through the large crystal grains. The flow velocity of the anti-solvent / solvent co-evaporation atmosphere is 0.5-2 L / min; a recrystallization atmosphere is obtained by using a method of co-evaporating a mixed solution composed of an anti-solvent / solvent, the crystallized perovskite thin film is transferred to the recrystallization atmosphere to be treated, small crystal grains on the upper layer of the perovskite thin film are selectively dissolved, large-size crystal grains on the lower layer absorb the selectively dissolved small crystal grains and are recrystallized upwards under thermal driving, and the perovskite thin film is obtained. Therefore, the through perovskite thin film with a large grain size is obtained, and the efficiency and the stability of the perovskite solar cell are improved.

The invention provides a production process of pyridaben, and belongs to the technical field of pesticides, and the production process comprises the following steps: adding a dichloropyridazinone-methanol solution and p-tert-butyl benzyl mercaptan into a condensation reaction kettle, dropwise adding an acid-binding agent, and carrying out a condensation reaction to obtain a pyridaben mixed solution; transferring the pyridaben mixed solution into a heating kettle, heating to completely dissolve the pyridaben, then carrying out filter pressing by a filter press into a crystallization kettle, carrying out cooling recrystallization, and then carrying out centrifugal separation and drying to obtain the pyridaben. According to the invention, pyridaben is produced by adopting a new process of directly heating, filtering and recrystallizing after condensation reaction, so that the use of high-toxicity and high-risk organic solvents such as methylbenzene in the recrystallization process is effectively avoided, the original production process is simplified, the product content is increased, the production cost is reduced, and the market demand can be fully met.

The invention relates to a production method and device for preparing ammonium / alkali through a microreactor, and belongs to the technical field of safety, environmental protection, energy conservation and water conservation. The method comprises the following steps: simultaneously feeding a saturated aqueous solution of sodium chloride and a sodium bicarbonate solution into a mixing zone for premixing, and feeding into a reaction zone for reaction through shunting to obtain a reaction mixed solution; crystallizing, filtering, washing and drying the reaction mixed solution to obtain sodium bicarbonate; performing crystallization, chemical sublimation, precipitation and recrystallization on the mother liquor obtained by filtering to obtain ammonium chloride, and recovering ammonia gas generated in the crystallization, chemical sublimation, precipitation and recrystallization processes of the mother liquor; calcining the sodium bicarbonate to obtain sodium carbonate, and recovering carbon dioxide released in the calcining process; the recovered ammonia gas, carbon dioxide and water are prepared into a sodium bicarbonate solution to be used as a reaction base solution. According to the invention, liquid-gas reaction is improved into liquid-liquid reaction, and the microreactors connected in series and in parallel are improved, so that the yield and purity of the product are improved.

The present application relates to aripiprazole synthesis technical field, specifically to a kind of preparation of 1-(2,3-dichlorophenyl) piperazine hydrochloride substantially without following dimer impurity compound (I), the structure of the impurity is determined to clarify the generation mechanism of the impurity, provide the train of thought for better control of the impurity and make corresponding judgment to the impurity derived subsequently, provide help to the quality research of subsequent intermediates and finished products;The present application replaces the existing multiple recrystallization process by means of filtration and salting-out, which can effectively simplify the operation and greatly reduce the use of organic solvents.

The invention relates to a method for separating nickel sulfate from nickel, lithium and sodium ternary sulfate. The method comprises the following steps: (1) carrying out evaporative crystallization on a nickel-lithium-sodium ternary sulfate solution, carrying out heat preservation and sedimentation, and then carrying out solid-liquid separation to obtain a first mother solution and a first crystal; (2) carrying out cooling crystallization on the first mother liquor, and carrying out solid-liquid separation to obtain a second crystal; (3) carrying out first washing treatment on the second crystal, and carrying out solid-liquid separation to obtain a third crystal; (4) heating and dissolving the third crystal, cooling, recrystallizing, and carrying out solid-liquid separation to obtain a fourth crystal; and (5) carrying out second washing treatment on the fourth crystal, carrying out solid-liquid separation, and drying an obtained fifth crystal to obtain the nickel sulfate product. According to the method, the nickel sulfate crystal can be directly separated from the high-concentration nickel-lithium-sodium sulfate, the process is simple, other impurities are not introduced, the purity of the target product is high, and industrial implementation is easy.

Disclosed in the present application are a quaternary sulfate molten salt heat storage material, a composite heat storage material, and a preparation method therefor and the use thereof. The preparation method for the quaternary sulfate molten salt heat storage material comprises: subjecting first sulfate-type salt lake raw brine to freezing and recrystallization treatments to obtain sodium sulfate decahydrate; subjecting second sulfate-type salt lake raw brine to evaporative crystallization and recrystallization treatments to obtain magnesium sulfate heptahydrate; and mixing the sodium sulfate decahydrate, the magnesium sulfate heptahydrate, potassium sulfate, and calcium sulfate, heating the mixture at a first heating rate to a first dehydration temperature for a first heat treatment, then heating at a second heating rate to a second dehydration temperature for a second heat treatment, and then heating at a third heating rate to a molten blending temperature for a third heat treatment, and thereby obtaining the quaternary sulfate molten salt heat storage material. In the present application, a quaternary sulfate molten salt heat storage material is prepared by a one-step method using dehydration and coupling technology. Moreover, the specific heat of the composite heat storage material is improved by adding nanoparticles to the quaternary sulfate molten salt heat storage material.

The present application belongs to the field of fusion reactor filter target plate cooling, and particularly relates to a filter target plate with composite micro-channel and super-vaporization structure cooling. The filter target plate comprises a plasma-facing material layer, a stress buffer layer, a micro-channel and super-vaporization composite structure heat sink, and a stainless steel cover plate. The micro-channel cooling is used in the micro-channel and super-vaporization composite structure heat sink corresponding to the strike point area of the target plate, and the super-vaporization channel cooling is used in the micro-channel and super-vaporization composite structure heat sink corresponding to the remaining area of the target plate. The present application can significantly reduce the surface temperature of the plasma-facing material in the strike point area of the target plate, prolong the service life of the filter target plate, and more efficiently transfer the ultra-high heat load deposited in the strike point area of the filter target plate, so as to ensure that the temperature of the plasma-facing material is lower than the recrystallization temperature of the material.