191results about How to "Promote crystallization" patented technology

The invention discloses a method for activating and precipitating MHP through magnesium, and belongs to the technical field of hydrometallurgy. The method comprises the following steps: S1, mixing a magnesium-containing solution with a sodium hydroxide solution, and carrying out precipitation reaction for 3-5 minutes to obtain a precipitator; s2, immediately mixing a precipitator with the laterite-nickel ore iron and aluminum removed liquid, and then carrying out first-stage nickel and cobalt precipitation reaction to obtain first-stage nickel and cobalt precipitation slurry; s3, performing first thickening treatment on the first-section nickel and cobalt deposited slurry to obtain first dense underflow and first dense overflow; and S4, filtering the first dense underflow to obtain an MHP product. According to the method, after the magnesium-containing solution and the sodium hydroxide solution are mixed, the magnesium solution and the sodium hydroxide solution are controlled to be mixed and react for 3-5 min, then the nickel and cobalt precipitation reaction is immediately carried out, the MHP product with high purity and quality can be obtained, and the whole method is simple and convenient for large-scale industrial application.

The invention discloses a method for preparing an animal adipose tissue simulant by using soybean protein and application of the animal adipose tissue simulant, and belongs to the technical field of deep processing of vegetable protein. Soybean protein is used as a raw material, the soybean protein and polysaccharide are compounded and heated to form thermal induction gel, then microgel particles are obtained through mechanical shearing and crushing, and recombinant soybean protein emulsion gel, namely the animal adipose tissue simulant, is prepared through vegetable oil emulsification and glutamine transaminase covalent cross-linking. The fat-reducing sausage is used as a substitute of pig back fat and is applied to development of fat-reducing sausages. The animal adipose tissue simulant prepared by the invention has texture and melting characteristics similar to those of animal pig back fat. The invention provides the preparation method of the plant-based fat simulant, which meets the requirements of environmental protection and health and sustainable production, not only meets the requirements of texture and melting characteristics of solid fat, but also provides technical support for high-value application of soybean protein in the field of plant meat foods.

The invention discloses a base membrane for a composite current collector and a preparation method of the base membrane, and belongs to the technical field of current collectors for lithium batteries. Comprising two polymer polar material layers and a polymer reinforcing material layer located between the two polymer polar material layers. The polymer polar material layer comprises polyolefin, a polar polymer material, an amphoteric material and an antioxidant; the polymer reinforced material layer comprises polyolefin, a reinforced material and an antioxidant; the base film for the composite current collector is of a sandwich structure composed of the polymer polar material layer, the polymer reinforcing material layer and the polymer polar material layer, the performance of the edge layer and the performance of the core layer can be considered to the maximum extent, good temperature resistance, tensile strength and electrolyte resistance are achieved, the safety of a device is improved on the whole, and the service life of the device is prolonged. And the current collector development trend is met.

The invention discloses a low-creep PP composite material for a buckle and a preparation method of the low-creep PP composite material, the composite material is prepared from the following raw materials in parts by weight: 100-120 parts of PP master batch, 5-10 parts of modified additive, 5-8 parts of modified carbon nano tube, 0.5-0.8 part of dicumyl peroxide and 0.1-0.3 part of tetraisopropyl titanate, when the PP master batch, the modified additive and the dicumyl peroxide are melted and blended, the low-creep PP composite material is prepared from the following raw materials in parts by weight: 100-120 parts of PP master batch, 5-10 parts of modified additive, 5-8 parts of modified carbon nano tube, 0.5-0.8 part of dicumyl peroxide and 0.1-0.3 part of tetraisopropyl titanate. Polypropylene molecular chains can be recombined with unsaturated double bonds on modified additive molecules to form a cross-linked grid structure, so that slippage of the molecular chains is reduced, and the modified additive molecules contain benzene ring structures, so that rigidity can be increased, and creep resistance of the composite material is improved; the modified carbon nanotubes and tetraisopropyl titanate are added for continuous melt blending, aldehyde groups on the modified carbon nanotubes can react with amino groups on side chains of the modified additives to form imine bonds, then a reversible cross-linked network of the imine bonds is formed in the composite material, and the impact resistance is improved.

The invention provides a low-dielectric-constant electromagnetic-shielding heat-conducting polyether-ether-ketone composite material and a preparation method thereof, and belongs to the technical field of high polymer material processing, the low-dielectric-constant electromagnetic-shielding heat-conducting polyether-ether-ketone composite material comprises the following raw materials: polyether-ether-ketone resin, low-dielectric-constant glass fibers, a conductive filler, a low-dielectric-constant filler and an auxiliary agent; comprising the following steps: S1, uniformly mixing polyether-ether-ketone resin, a low-dielectric filler, a conductive filler and an auxiliary agent to obtain a mixed material; s2, the mixed material is added into a double-screw extruder from a main feeding port, the low-dielectric glass fiber is added into the double-screw extruder from a side feeding port, the mixed material and the low-dielectric glass fiber are evenly mixed in a screw cavity of the double-screw extruder, and a secondary mixed material is obtained; s3, the secondary mixed material is subjected to heating melting, extrusion granulation and sieving, and the polyether-ether-ketone composite material is obtained. According to the technical scheme provided by the invention, the composite material has the properties of low dielectric constant, strong electromagnetic shielding and high thermal conductivity at the same time.

The invention provides a preparation method of high-purity molybdenum trioxide, which belongs to the technical field of molybdenum trioxide production and comprises the following steps: S1, crushing, grinding and roasting molybdenum ore sand to obtain crude molybdenum oxide, adding the crude molybdenum oxide into a sodium hydroxide solution, heating, stirring and filtering to obtain a crude sodium molybdate solution; s2, adjusting the pH value of the crude sodium molybdate solution to 5.5-7.0, introducing the crude sodium molybdate solution into an exchange column of macroporous cation exchange resin, then adjusting the pH value of the solution to 7.0-8.5, and introducing the crude sodium molybdate solution into an exchange column filled with anion exchange resin to obtain a high-purity sodium molybdate solution; s3, excessive ammonia water is added into the high-purity sodium molybdate solution, ammonium molybdate is separated out, washing and drying are conducted, and high-purity ammonium molybdate is obtained; and S4, the high-purity ammonium molybdate is put into a rotary calcining furnace, rare earth oxide is sprayed on the inner wall of a furnace tube, and the high-purity molybdenum trioxide is prepared by adopting a calcining mode of firstly heating, then cooling and then heating. According to the invention, the purpose of producing high-purity molybdenum trioxide is realized.

The invention belongs to the field of photoelectric materials, and particularly relates to a vacuum vapor deposition perovskite material crystallization method, which is characterized in that vacuum vapor deposition of a perovskite precursor is carried out step by step, and a specific additive containing amide, amino, carboxyl and other functional groups is introduced in the deposition process to realize dynamic regulation and control of perovskite grain growth. According to the method, the perovskite crystallization kinetic process can be regulated and controlled, so that the crystallization of perovskite is optimized, the quality of the film is improved, the defects of the perovskite film are reduced, and the fluorescence quantum yield is improved.

The invention provides ionic liquid grafting modified high-temperature-resistant bio-based nylon as well as a preparation method and application thereof, and belongs to the technical field of bio-based high polymer materials. After nylon 5T salt is subjected to prepolymerization reaction, imidazolium ionic liquid is added for final polymerization, and the ionic liquid grafting modified high-temperature-resistant bio-based nylon is obtained. In the polymerization process, the imidazole ionic liquid enters a polyamide macromolecular chain, so that the intermolecular acting force can be reduced, and the molecular chain spacing can be increased, thereby reducing the melting point of the bio-based nylon, increasing the flowability of the bio-based nylon and improving the thermal property, crystallization and other behaviors of the bio-based nylon; the processing stability and the spinning performance of the bio-based nylon in the later period are effectively improved, meanwhile, the energy consumption is reduced, and the bio-based nylon with high strength, high orientation and high crystallization is obtained.

The invention discloses a co-extrusion foam board and a preparation method thereof, and relates to the technical field of plastic boards. When the co-extrusion foam board is prepared, firstly, diphenylmethane diisocyanate reacts with polycarbonate diol, hydroxyl-terminated hydrogen-containing silicone oil, diethylene glycol and ethyl alcohol to prepare polyurethane master batches; bamboo powder is subjected to secondary carbonization, iron oxide loading and silane coupling agent modification, and modified magnetic bamboo charcoal powder is prepared; the preparation method comprises the following steps: reacting phosphonitrilic chloride trimer with sodium 2-allyl phenolate and sodium phenolate to prepare a flame-retardant cross-linking agent; the preparation method comprises the following steps: blending polyurethane master batch, modified magnetic bamboo charcoal powder and a flame-retardant cross-linking agent, extruding and foaming by using supercritical carbon dioxide to obtain a foaming core layer, and co-extruding the foaming core layer and a non-foaming surface layer obtained by modifying and extruding polyethylene glycol terephthalate to obtain the co-extruded foaming board. The prepared co-extrusion foam board has good impact strength and bending strength and good flame retardance, heat insulation, sound insulation and electromagnetic shielding performance.

The invention relates to the technical field of polypropylene fibers, and discloses a modified high-strength polypropylene composite fiber and a preparation method thereof.The preparation method comprises the steps that polypropylene, modified polypropylene, aminated calcium carbonate and an antioxidant with the mass ratio being 100: (4-7): (1-3): (0.1-0.3) are subjected to melt blending and extrusion granulation in a double-screw extruder, then extrusion molding is conducted through a trace rheometer, and the modified high-strength polypropylene composite fiber is obtained. Nano calcium carbonate has excellent mechanical properties and can also be used as a heterogeneous nucleating agent to promote crystallization of polypropylene and improve heat resistance, weather resistance and processability of the polypropylene, basalt fibers in the modified polypropylene have high strength and modulus, and the modified high-strength polypropylene composite fibers have good mechanical properties. According to the polypropylene composite fiber, the tensile strength and the elongation at break of the polypropylene fiber can be improved, the strength of the polypropylene fiber is improved, after modification, the polypropylene composite fiber and the polypropylene fiber have excellent dispersity, compatibility and synergistic effect in a matrix, and the polypropylene composite fiber has excellent mechanical properties and comprehensive properties.

The invention discloses a method for preparing hexagonal SrFe by liquid phase doping 12 O 19 The invention relates to the field of permanent magnet ferrite preparation, and aims to solve the problem that the existing doping method easily leads to uneven raw material composition and the formation of mixed phases in the magnet; the invention comprises the following steps: 3+ / Sr 2+ Atomic ratio, weigh analytical pure Fe 2 O 3 、SrCO 3 ; The weighed raw materials were placed in a mortar and ground thoroughly to mix; C was added to the resulting mixture 8 H 20 O 4 Si and fully grind and mix evenly; put the ground and mixed powder into a mold for tableting to obtain a cylindrical sample; take the sample and sinter it in a muffle furnace and then cool it to room temperature with the furnace to obtain a liquid-phase doped SrM ferrite block; the present invention can use liquid C 8 H 20 O 4 Si as an additive for liquid phase doping of hexagonal SrFe 12 O 19 The saturation magnetization of ferrite is further improved, and the generation of impurity phase can be effectively suppressed.

The invention relates to a waterproof anti-cracking composite coiled material and a preparation method and application thereof. The composite coiled material comprises a paper base layer and a waterproof coating coated on the surface of the paper base layer, and the waterproof coating is formed by curing a waterproof finishing agent. The waterproof finishing agent comprises the following raw materials in parts by mass: 60-75 parts of epoxy resin, 2-5 parts of a hardening agent, 5-20 parts of rubber particles, 8-15 parts of modified bacterial cellulose, 20-30 parts of polylactic acid, 10-20 parts of polyethylene glycol and 5-10 parts of a silane coupling agent. The composite coiled material can serve as a decorative material to be attached to the surface of furniture, and due to the good flexibility, crack resistance and tensile effect, the technical problems that when traditional furniture decorative paper is attached, corners are prone to being bent and broken, and the waterproof performance is poor are solved.

The invention discloses a low-dielectric low-loss high-strength borosilicate glass ceramic composite material and a preparation method thereof, and belongs to the technical field of borosilicate glass ceramic composites.The low-dielectric low-loss high-strength borosilicate glass ceramic composite material is prepared from, by weight, 70% of low-alkali borosilicate glass ceramics with the low borosilicate ratio, 29% of Al2O3 and 1% of Bi2O3. The preparation method comprises the following steps: preparing low-alkali borosilicate glass ceramics with a high borosilicate ratio, melting the low-alkali borosilicate glass ceramics with the high borosilicate ratio and amorphous SiO2 at a set temperature to obtain the required low-alkali borosilicate glass ceramics with the low borosilicate ratio, and finally mixing and ball-milling the crushed and ground low-alkali borosilicate glass ceramics with Al2O3 and Bi2O3 to obtain the low-alkali borosilicate glass ceramics with the low borosilicate ratio. And finally, the borosilicate glass ceramic composite material is sintered at the temperature of 880-900 DEG C. The borosilicate microcrystalline glass ceramic composite material is low in dielectric, low in loss and high in strength.

The invention relates to the technical field of gas separation materials, in particular to a preparation method of a high-selectivity functionalized ZIF-7-8 mixed matrix membrane. The preparation method comprises the following steps: taking pebax-1657 as a matrix material of a mixed matrix membrane, synthesizing a ZIF-7-8 filling material by virtue of a non-solvent induced crystallization (NSIC) method, then carrying out ionic liquid impregnation on ZIF-7-8, and finally preparing the high-performance mixed matrix membrane in a blending manner, so as to obtain the functional modified ZIF-7-8 mixed matrix membrane material. 1-butyl-3-methylimidazole bis (trifluoromethanesulfonyl) imide salt ([bmim] [Tf2N]) is adopted as an ionic liquid, ZIF-7-8 is subjected to functionalization treatment through a post-synthesis method, and the ionic liquid with high affinity to CO2 is loaded in a nanomaterial pore cage, so that the adsorption capacity of the material to CO2 is improved, and the performance of the membrane material is further optimized; therefore, the purpose of improving the CO2 separation performance of the mixed matrix membrane is achieved.

The invention relates to the technical field of calcium formate production, in particular to a calcium formate efficient evaporative crystallization method which comprises the following steps: S1, mixing reaction; s2, removing impurities; s3, evaporative crystallization; s4, centrifugal drying; and S5, cooling and packaging. The method has the advantages that the whole process is simple, the production cost and the labor intensity are reduced, large-scale continuous production is easy to realize, the content of the produced calcium formate product is 99% or above, the purity is high, and the color is pure white; the triple-effect evaporation technology is adopted, energy consumption is reduced, the effects of energy conservation and emission reduction are achieved, meanwhile, crystals which are evenly distributed and large in particle size can be obtained through the last-effect DTB crystallizer, follow-up filtering and drying are facilitated, and energy consumption in the follow-up process can be greatly reduced; in the packaging process, the crystals are introduced into a cooler to be cooled and then conveyed to a cooling cyclone separator, the temperature of the crystals is reduced to 40 DEG C, it is guaranteed that particles are uniform and cannot be hardened, the quality is optimized, and the operation safety degree is also improved.

The invention discloses a preparation method of a PET foam material based on maleic anhydride grafted polypropylene modified PET, maleic anhydride (MAH) is grafted to a polypropylene chain through a chemical grafting method to form maleic anhydride grafted polypropylene (PP-g-MAH), the maleic anhydride (MAH) is a bifunctional compound with high reaction activity, and when the maleic anhydride (MAH) is grafted to the PP chain, the PP-g-MAH is grafted to the PP chain, the PP-g-MAH is grafted to the PP chain to form the PP-g-MAH. Polar groups can be provided, and the interfacial compatibility with PET is enhanced; an anhydride group of the PP-g-MAH can react with a terminal hydroxyl group in PET (Polyethylene Terephthalate), so that the PET is modified; experiments prove that the crystallization induction time of the modified PET can be effectively shortened and the crystallization rate and crystallinity can be improved in the production process of manufacturing the foam material from PET, so that the performance of the modified PET foam material is remarkably improved.

The invention discloses a perovskite solar cell which comprises a conductive glass layer, an electron transport layer, a perovskite layer, a hole transport layer and a metal electrode layer which are stacked, and the perovskite layer is made of FAPbI3; the perovskite solar cell is characterized by further comprising a 2D perovskite seed layer arranged between the electron transport layer and the perovskite layer, and the 2D perovskite seed layer provides a nucleation site for formation of an alpha-FAPbI3 phase of the perovskite layer; the 2D perovskite seed layer is prepared by the following steps: 1) dissolving organic amine, PbO and MACl in a mixed aqueous solution of HI and H3PO2, heating while stirring to react, and then cooling and separating out to obtain a 2D perovskite seed single crystal; and 2) preparing the 2D perovskite seed single crystal into a seed precursor solution, coating the surface of the electron transport layer with the seed precursor solution, and annealing to obtain the 2D perovskite seed layer.

The invention discloses a perovskite nanocrystal preparation method and device based on a second-order microfluidic system, and the method comprises the steps: injecting a cation precursor solution and a lead halide precursor solution into the microfluidic system through an injection pump, and respectively preheating the precursor solutions; and mixing the preheated precursor solution in a microfluidic system, and carrying out primary heating and secondary heating. And finally, cooling to obtain the nanocrystal at the outlet of the microfluidic system. The invention also provides a microfluidic device for realizing the preparation method, and the microfluidic device comprises an injection pump, a precursor preheating module, a multi-interface communicator, and a heating module I, a refrigeration module, a heating module II and a quenching module which are cascaded in sequence. The temperature of different reaction stages is independently adjusted through the precursor preheating module, the heating module I and the heating module II, the crystallization and growth process is optimized, the problem of micro-pipeline blockage caused by precursor precipitation at high temperature is avoided, the system stability is improved, and batch preparation of high-performance perovskite photoelectric materials is supported.

The invention discloses a lithium battery diaphragm and a preparation method thereof. The diaphragm is obtained by coating a base membrane with slurry and drying. The preparation method of the slurry comprises the steps that ceramic powder, polyvinyl alcohol, a first substance and a cross-linking agent are mixed to be uniform and dried, first powder is obtained, and the first substance is nanocellulose crystals and / or sodium carboxymethyl cellulose; uniformly mixing the first powder, water and an adhesive to obtain slurry; according to the preparation method, chemical bonds are formed between the polyvinyl alcohol and the first substance and the ceramic powder through chemical crosslinking by using the crosslinking agent, so that a compact and stable three-dimensional cross-linked network structure is obtained, the solubility of the diaphragm in water is reduced, the high-temperature resistance and the wetting ability of the diaphragm are effectively improved, and the surface tension is reduced. Intermolecular hydrogen bonds can be formed between a large number of hydroxyl groups on the surface of the first substance and hydroxyl groups on a polyvinyl alcohol molecular chain to promote crystallization and limit the movement of the polyvinyl alcohol molecular chain, so that the high-temperature resistance and the wetting ability of the diaphragm are improved, and the surface tension is reduced.

The invention relates to the technical field of solar cells, and mainly provides a solar cell and a preparation method thereof. The preparation method of the solar cell comprises the following steps: providing an N-type silicon wafer, and respectively forming a first intrinsic amorphous silicon layer and a second intrinsic amorphous silicon layer on two opposite surfaces of the N-type silicon wafer; forming an N-type doped microcrystalline silicon layer on the first intrinsic amorphous silicon layer and forming a P-type doped microcrystalline silicon layer on the second intrinsic amorphous silicon layer by using an intermittent CO2 plasma treatment process; and forming a first transparent conductive layer and a first electrode on the N-type doped microcrystalline silicon layer, and forming a second transparent conductive layer and a second electrode on the P-type doped microcrystalline silicon layer. The preparation method of the solar cell in the technical scheme of the invention can promote the crystallization of the oxygen-doped microcrystalline silicon, enhance the electrical properties of the microcrystalline silicon, properly reduce the thickness of the doped microcrystalline silicon layer, reduce the process time and reduce the production cost.

The invention discloses high-alkali-resistance glass and a preparation method and application thereof.The preparation method comprises the steps that evenly-mixed ingredients are added into a platinum crucible at the temperature of 1400-1500 DEG C, the platinum crucible is placed in a lifting furnace to be subjected to heat preservation for 60-80 min at the temperature of 1550-1580 DEG C, then the crucible is taken out, and molten liquid is poured onto a mold; after the molten liquid is formed, quickly transferring the molten liquid into an annealing furnace, keeping the temperature at 550-580 DEG C for 30 minutes, and cooling the molten liquid to room temperature along with the furnace to obtain the high-alkali-resistance glass. The corrosion rate of the prepared high-alkali-resistance glass is 7-14 mg / dm < 2 >, the alkali resistance of the high-alkali-resistance glass is far lower than the industrial standard that the alkali resistance of the high-alkali-resistance glass is smaller than or equal to 75 mg / dm < 2 >, the weight loss of the glass in a NaOH solution with the ph being larger than 12 is small, and the high-alkali-resistance glass can be used for containing strong-alkali liquid medicine such as phenytoin sodium for injection and omeprazole for injection and other injections with the ph being larger than 11. And the problems of sheet falling or influence on liquid medicine quality caused by poor alkali resistance can be avoided.

The invention discloses a compound and a preparation method thereof, a hole transport material and a perovskite solar cell, and belongs to the technical field of materials. The structure of the compound is as follows: # imgabs0 # 10lt; nlt; 10000, and n is an integer; and Ar is an aniline fluorene group or a diphenylamine group. The preparation method comprises the following steps: reacting dithienopyrrole, 4-bromobenzaldehyde and a catalyst I to obtain an intermediate I; reacting the intermediate I with bromo-succinimide to obtain an intermediate II; reacting the intermediate II, aniline fluorene or diphenylamine substances and a catalyst II to obtain an intermediate III; reacting the intermediate III with sodium borohydride to obtain an intermediate IV; reacting the intermediate IV with acryloyl chloride to obtain an intermediate V; mixing and reacting the intermediate V and an initiator to obtain the compound. As a hole transport material, the compound is relatively high in decomposition temperature, high in stability, good in film-forming property and good in mobility, and is beneficial to the photoelectric conversion effect of a perovskite solar cell.

The invention belongs to the field of solar cell materials and technologies, and particularly relates to a preparation method of a silane surfactant, a passivation modification layer and a perovskite solar cell. 3-aminopropyltriethoxysilane or 3-aminopropyltrimethoxysilane is adopted to modify and improve the interface and internal structure of the perovskite solar cell, moisture in air reacts with silane and is hydrolyzed to form a Si-O-Si conductive network, carrier transport is promoted, uncoordinated lead ions and iodine vacancies of perovskite are passivated, internal defects of a thin film are reduced, and the performance of the thin film is improved. The water erosion is reduced, and the purpose of improving the device performance is achieved. The maximum efficiency of the prepared inorganic CsPbI3 perovskite solar cell can reach 20.50%.

This invention provides a microgap suspension device and a microgap inverted suspension heat treatment process, comprising the following steps: adding p-aminobenzenesulfonic acid to a solvent, mixing thoroughly, and then adding carbon nanotubes to obtain a carbon nanotube dispersion; stirring the carbon nanotube dispersion under heating conditions to obtain a p-aminobenzenesulfonic acid-modified carbon nanotube dispersion; coating a substrate surface with a lead bromide solution, then coating the lead bromide surface with a cesium bromide solution, then coating the cesium bromide surface with the p-aminobenzenesulfonic acid-modified carbon nanotube dispersion; and finally performing heat treatment through a microgap suspension device to form a photoactive layer film. The microgap inverted suspension heat treatment process of this invention, through controllable height suspension heat treatment, ensures that the film is almost unconstrained by the rigidity of the substrate during thermal expansion and cooling contraction, thus making it suitable for flexible substrates as well. It also avoids direct contact damage to flexible substrates during high-temperature heat treatment.

The invention discloses a grain size grading design method of a low-shrinkage ceramic green body and application of the grain size grading design method in quartz ceramic preparation, and belongs to the technical field of ceramic materials. By optimizing the particle size grading of quartz, cristobalite crystallization in the preparation process of the quartz ceramic is promoted, the sintering densification is improved, and the mechanical property and the size stability of the quartz ceramic, especially the bending strength under the high-temperature condition, are remarkably improved.

This invention relates to the field of inorganic materials, specifically a method for preparing antimony trioxide from antimony concentrate. The method involves adding a DNA template and a mercapto quaternary ammonium salt ionic liquid to water to obtain a first solution, and adding antimony glycolate to ethanol to obtain a second solution. The second solution is then added to the first solution, the pH of the reaction solution is adjusted to 5-6, and a hydrolysis reaction is carried out. The collected product is then calcined to obtain antimony trioxide. Antimony trioxide exhibits great application potential as a high-performance pseudocapacitor electrode material. Its unique hollow one-dimensional channel and ultra-high specific surface area also indicate broad application prospects in flame retardant synergy, gas sensing, catalysis, and other fields.

The invention belongs to the technical field of reutilization of palm shells, and particularly relates to a method for preparing xylose by taking palm shells as a raw material. Comprising the following steps: (1) pretreatment: carrying out crushing and steam explosion pretreatment on an air-dried palm shell raw material to obtain palm shell steam explosion slag; (2) enzymolysis: mixing the steam explosion slag with a compound enzyme solution, stirring, preserving heat, performing enzymolysis, and filtering to obtain enzymolysis slag; (3) hydrolysis: adding acid into the enzymolysis residues for hydrolysis to obtain hydrolysate; (4) salting-out: adding alkali into the hydrolysate to precipitate protein, and filtering to obtain salting-out liquid; and (5) purification: carrying out activated carbon decoloration, electrodialysis and ion exchange desalination on the salting-out solution to obtain a purified solution. Hard palm shell cell walls are broken through steam explosion pretreatment, and hemicellulose and lignin are better separated during steam explosion through dilute acid soaking, so that more hemicellulose is released, and a better hydrolysis effect is obtained.

The utility model relates to the technical field of tris (2-hydroxyethyl) isocyanurate production, in particular to a tris (2-hydroxyethyl) isocyanurate crystallization separation device which comprises a reaction kettle, a heating pipe, a stirring assembly and a scraping assembly, the lower end face of the reaction kettle is connected with a plurality of supporting legs which are evenly distributed at equal intervals, and a discharging port is formed in the bottom of the reaction kettle. An electromagnetic valve is connected to the discharge port, an annular containing cavity is formed in the side wall of the reaction kettle, a plurality of circumferentially distributed heating pipes are connected into the containing cavity, and the stirring assembly and the scraping assembly are connected to the top and the bottom of the reaction kettle respectively. According to the utility model, the scraping assembly rotates to contact with the bottom surface of the reaction kettle in a use state to scrape crystals so as to enable the crystals to enter the discharge port, and the cleaning assembly in the scraping assembly can rotate to contact with the inner wall of the reaction kettle in the process of rotating along the circumferential direction of the reaction kettle, so that crystals or dirt separated out from the inner wall of the reaction kettle can be scraped.

The invention discloses an inorganic salt recovery device, which belongs to the technical field of inorganic salt recovery, and comprises a stirring mechanism and a wall scraping mechanism, the stirring mechanism comprises a recovery tank, a cover plate and a material guide cone; a stirring shaft is mounted in the recovery tank, the top end of the stirring shaft penetrates through the cover plate and is connected with a mounting plate, a driving motor is mounted on the mounting plate, and the output end of the driving motor is connected with the stirring shaft; a first steam channel is further formed in the stirring shaft, the bottom of the first steam channel is connected with a steam inlet pipeline, and the steam inlet pipeline penetrates through the material guide cone and is connected with an evaporator; a plurality of stirring rods are installed on the periphery of the stirring shaft, a second steam channel is formed in the uppermost stirring rod and communicates with the top of the first steam channel, and a plurality of steam output holes communicate with the bottom of the second steam channel; the wall scraping mechanism is connected with the stirring shaft; by means of the design, the purposes of preventing the air inlet pipe from being blocked in the evaporative crystallization process, preventing crystals from being adhered to the inner wall and drying initial crystals can be achieved.

The invention relates to a nano cerium-zirconium oxide as well as a preparation method and application thereof, and belongs to the technical field of automobile exhaust purification. Water-soluble polyamide is used as an auxiliary adsorption material, so that the utilization rate of rare earth metal elements and the dispersity of the rare earth metal elements in a final product are improved, and the material cost is reduced and the highest oxide high-temperature thermal stability is improved. Meanwhile, adsorption points of rare earth metal elements in the PAM-rare earth metal complex play a role in heterogeneous nucleation, and crystal nucleus formation can be promoted; and the water-soluble PAM is beneficial to improving the content of substances around crystal nucleuses, accelerating the crystallization process and obtaining large-size crystals, and is beneficial to shortening the crystallization aging time. Hydrophilic groups and hydrophobic groups exist in water-soluble PAM molecules at the same time, so that the water surface tension can be reduced, the dispersity of hydroxide colloid in a precipitation flocculating constituent is improved, and the reduction of the specific surface area caused by agglomeration is reduced; meanwhile, a PAM molecular chain can slow down collapse of a crystal pore channel structure caused by water loss in the process of roasting hydroxide colloid into oxide at high temperature.