23results about How to "Reduced Diffusion Resistance" patented technology

The invention discloses a lithium manganate positive electrode material, a preparation method and an applied lead-lithium battery, relates to the technical field of lithium manganate positive electrode materials, and solves the problems that the existing lithium manganate positive electrode material is poor in structure and interface stability and poor in rate and cycle performance. The positive electrode material is composed of a lithium manganate matrix and a double-layer composite coating, the matrix is prepared by taking lithium carbonate and manganous-manganic oxide as raw materials and doping magnesium hydroxide, aluminum hydroxide and titanium dioxide multi-plasma phase; the lithium manganate positive electrode material is prepared by uniformly compounding a lithium manganate matrix modified by a spinel inner layer, vinyl functionalized MOF and a polyvinylidene fluoride-hexafluoropropylene copolymer on the surface of an aluminum foil receiver through an electrospinning-electrospray synergistic process. The material is applied to the lead-lithium battery, shows excellent electrochemical performance and has good practical application value.

The invention discloses a method for synthesizing mesalazine and application of mesalazine. The method comprises the following steps: introducing p-nitrophenol, formic acid and a Cu-Co-coated MFI-NS molecular sieve catalyst into a continuous flow reaction zone, and sequentially carrying out electrophilic substitution and nitro hydrogenation cascade reaction at normal pressure and 50-70 DEG C; the catalyst has a micropore-mesopore stepped pore channel, and contains a Cu0 metal cluster and a framework Co < 2 + > acid site. And separating, acidifying and crystallizing the reaction liquid to obtain a finished product. According to the invention, the shape-selective selectivity and difunctional synergistic effect of the molecular sieve are utilized, high conversion rate (gt, 98%) and high selectivity (gt, 94%) under mild conditions are realized, the product purity is greater than or equal to 99.5%, and the Cu / Co residue meets the ICHQ3D standard. The catalyst can be recycled for 10 times or more, the yield is reduced by 5% or less, iron mud pollution of a traditional iron powder method and the metal leaching risk of a noble metal catalyst are thoroughly eliminated, and the method has the remarkable advantages of being environmentally friendly, efficient, low in cost, easy to industrially amplify and the like and is suitable for preparing the medicine for treating the inflammatory bowel disease.

This invention relates to the field of freeze-drying technology, specifically to an intelligent vacuum freeze dryer and its usage method. The dryer includes a main unit and a pre-freezing vacuum chamber within it, a shelf placed inside the pre-freezing vacuum chamber, the shelf having an internal cavity and a main gas inlet at its bottom for gas to enter the internal cavity; a carrying tray with multiple evenly arranged internal components for storing materials, the tray having multiple planar grids and heating elements for releasing heat, multiple push rods for moving materials within the planar grids, and an adjustment component for adjusting the position of the push rods according to different usage environments; and side rotating columns with multiple evenly rotatable components connected to the sidewalls of the carrying tray, each side rotating column having multiple exhaust ports, and the carrying tray having an efficiency-enhancing component for driving the side rotating columns.

The invention discloses a method for preparing durene by utilizing unsym-trimethylbenzene and methanol, which comprises the following steps: mixing unsym-trimethylbenzene, methanol and hydrogen, heating and gasifying, feeding into a fixed bed reactor, and carrying out alkylation reaction through a molecular sieve catalyst with hierarchical pore distribution to prepare durene, after a reaction product flowing out of the alkylation reactor is subjected to gas-liquid separation and oil-water separation, liquid-phase hydrocarbon components enter a rectification separation system, and light hydrocarbon with the carbon number of C6 or below, methylbenzene, xylene, trimethylbenzene, tetramethylbenzene and aromatic hydrocarbon fractions with the carbon number of C11 or above are separated out. The mesoporous channel of the catalyst increases the contact probability of the raw material and the active site of the molecular sieve, promotes the playing of the activity of the catalyst in a fixed bed, reduces the diffusion resistance of the raw material and the product, promotes the rapid diffusion of the product, and reduces the occurrence of side reactions, so that the conversion rate of unsym-trimethylbenzene and the selectivity of durene are improved; therefore, high durene yield can be obtained.

This invention discloses a method for preparing an internally pressurized MOF-based hollow fiber composite membrane module, belonging to the field of membrane separation technology. The invention involves introducing an aqueous solution containing metal ions and an organic solution containing organic ligands into the shell side and tube side of a hollow fiber membrane module, respectively. By controlling the number of reactions between metal ions and organic ligands on the inner surface of the hollow fiber membrane, a continuous MOF functional layer is precisely constructed. Subsequently, a low-concentration polymer solution is used to repair defects in the MOF layer, resulting in an internally pressurized MOF-based hollow fiber composite membrane module, which is then applied to pervaporation ethanol / water separation. This method simplifies the preparation process of the internally pressurized hollow fiber composite membrane module; the thin inner surface MOF layer reduces molecular diffusion resistance and enhances molecular mass transfer; the surface-coated polymer matrix effectively repairs MOF layer defects, further enhancing molecular separation selectivity and effectively protecting the MOF functional layer; and it enhances the long-term stability of the membrane module.

The application relates to a preparation method and a phased application method of an aging SBS modified asphalt regenerant with diffusion and enhancement, and belongs to the technical field of road engineering materials and waste asphalt regeneration. A first agent and a second agent are used in stages, the first agent comprises naphthenic base oil and / or aromatic base regenerative oil, epoxy vegetable oil and / or fatty acid ester, a surface active diffusion promoter, a small molecule compatibilizer and an antioxidant, the second agent comprises maleic anhydride grafted SBS and / or maleic anhydride grafted SEBS, liquid rubber and / or hydroxyl-terminated polybutadiene, an epoxy reactive compatibilizer, tackifying resin, a non-amine type interface stabilizing aid and a complexing aid of a hindered amine light stabilizer and an ultraviolet absorber. The application can solve the problems that softening and enhancement of a traditional single-dose regenerant are difficult to be considered, the two-component synchronous adding mode is insufficient in stage control, aging SBS modified asphalt diffusion softening is insufficient, SBS elastic network repair is uneven and the durability after regeneration is insufficient.

The present application relates to adsorption separation of bisphenol A and 2,4-bisphenol A adsorbent and its adsorption separation process; the adsorbent is a high-silicon Y molecular sieve containing rare earth, the molar ratio of the contained silicon oxide and aluminum oxide is 2.5:1-15:1, the contained rare earth metal is one or a combination of multiple of lanthanum, cerium, scandium and yttrium, the content of rare earth metal is 10:1-1000:1 in terms of the molar ratio of silicon and rare earth metal, and the rare earth metal exists in the form of metal ions. The adsorption separation process is to contact the mixture containing bisphenol A, 2,4-bisphenol A, triphenol and chroman in the crystallization mother liquor with the adsorbent in the adsorption separation reactor to carry out adsorption separation, and the obtained bisphenol A and 2,4-bisphenol A after adsorption separation enter the isomerization reaction unit; the obtained triphenol and chroman after adsorption separation enter the cracking reaction unit. Phenol is used as the eluent, has strong affinity with the adsorbent, and the elution efficiency reaches more than 95%.

The invention discloses a catalyst for improving an octane number in light naphtha isomerization and a preparation method of the catalyst. The catalyst comprises 40-70wt% of a carrier, 5-15wt% of a dispersing agent, 15-25wt% of a pore forming agent and 8-20wt% of transition metal, wherein the transition metal is based on the oxide thereof. The two active centers of the ZSM-5-5at-ZrO2 composite molecular sieve catalyst cooperate to catalyze cracking and alkylation, and due to the mesopores of the shell, the diffusion resistance is reduced, and the diffusion of reactants and products is accelerated, so that the ZSM-5-5at-ZrO2 composite molecular sieve catalyst has the characteristics of good accessibility of the catalytic active centers, high catalytic activity, good stability and the like.

The invention discloses hollow Silicalite-1 zeolite with controllable mesopores as well as a preparation method and application of the hollow Silicalite-1 zeolite, and the obtained Silicalite-1 zeolite is composed of a mesoporous shell with adjustable pore diameter and a hollow inner cavity. The Silicalite-1 zeolite is provided with a hollow cavity, sufficient space is provided for amine loading, a shell layer is provided with a mesoporous structure with the pore diameter adjustable in the range of 2-20 nm, and amine molecule dispersion and CO2 diffusion efficiency are both considered. The invention further provides a solid amine CO2 adsorbent, high-capacity loading and good dispersity of amine and efficient diffusion of CO2 are synchronously achieved through a composite structure of a hollow cavity and a controllable mesoporous shell layer of a zeolite carrier, and the tradeoff limitation of a traditional carrier between mass transfer and loading is broken through. The adsorbent can be used for capturing CO2 in medium and low temperature flue gas. According to the invention, the problems of poor amine dispersibility, large CO2 diffusion resistance, low adsorption capacity, easy inactivation and the like caused by narrow pore channels of the zeolite carrier of the existing solid amine adsorbent are solved.

The utility model discloses a naphtha dechlorination device, which relates to the technical field of dechlorination equipment and comprises a tank body, a mounting shell is mounted at the top end of the tank body, a rotating component is mounted in the mounting shell and comprises a rotating motor mounted in the mounting shell, and the output end of the rotating motor is connected with a first bevel gear. One side of the top end of the first bevel gear is in meshed connection with a second bevel gear, the middle of the second bevel gear is fixedly connected with a first rotating rod, one side of the bottom end of the first bevel gear is in meshed connection with a third bevel gear, the first rotating rod is arranged on the inner wall of the third bevel gear in a sleeving mode and is rotationally connected, and a fixing support is installed on the inner wall of the tank body; according to the utility model, the inner stirring blade and the outer stirring blade respectively rotate in opposite directions by utilizing the rotating assembly to form a complex three-dimensional flow field, and when the inner-layer stirring blade rotates in the forward direction, materials in a central area are driven to quickly circulate, so that a dechlorinating agent is quickly dispersed into a naphtha main body.

This invention discloses a method for preparing a catalyst for hydrodenitrification and decarbonization of heavy oil, comprising the following steps: (1) mixing boehmite powder, boron-containing micron-sized spherical activated carbon, and water into a slurry, then separating the solid and liquid phases, drying the solid phase material, then kneading, molding, drying, and calcining under an inert atmosphere to obtain an alumina support precursor, and then loading boron to obtain a boron-modified alumina support precursor; (2) adding the boron-modified alumina support precursor and propylene oxide aqueous solution into a closed high-pressure reactor, reacting at 60-100℃ for 1-4 hours, then raising the temperature to 110-180℃ for 2-6 hours, drying, and calcining to obtain an alumina support, and then loading hydrogenation active components to obtain the catalyst product. The catalyst prepared by this method has a worm-like particle morphology on its surface, and the pores formed by the accumulation of worm-like particles are open. The catalyst also has suitable Brønsted acid and Lewis acid content. This catalyst is suitable for hydrodenitrification and decarbonization reactions of inferior heavy oil.

This invention relates to a negative electrode for a secondary battery and a secondary battery including the same. The negative electrode for the secondary battery comprises: a current collector; and a negative electrode active material layer formed on the current collector, containing a negative electrode active material, satisfying the following relation 1: [Relation 1] D < 1.9·10 ‑3 In Equation 1, D is the diffusion coefficient of lithium ions within the negative electrode, derived mathematically as follows: D = σ 2 ·τ d ‑γ σ is the thickness (cm) of the negative electrode active material layer, and τ d Here, γ is the diffusion time (s), and γ is the dispersion parameter, satisfying 0.8 ≤ γ ≤ 0.95. The electrode of this invention forms fine and dense pores, thereby reducing diffusion resistance within the electrode and thus enabling a battery with high output performance.

This invention discloses a hierarchical guanidine resin-based CO2 adsorbent material and its preparation method, belonging to the field of polymer synthesis technology. The adsorbent material prepared by this invention has a composite spherical structure and a hierarchical pore structure, including micropores, mesopores, and macropores. By introducing a hierarchical pore structure, the adsorption capacity of the material for CO2 is effectively improved. The introduction of hierarchical pores can significantly reduce molecular diffusion resistance and increase the contact area between the adsorbent and CO2 molecules, thereby achieving rapid adsorption. Furthermore, pyridyl, polyamino compounds, and guanidine groups have strong basicity and chemical affinity for CO2. Through surface functionalization modification, the number of active sites on the material surface is significantly increased, thereby further improving the CO2 adsorption capacity and selectivity.

This invention discloses a reinforced separator material for power batteries and its preparation method, belonging to the field of separator material technology. By acid-activating and hydrothermally coating boehmite powder, polydopamine-coated powder is obtained, improving the thermal stability of the powder and the strong bonding force between subsequent slurry components. Then, through ion exchange, zinc-intercalated montmorillonite is obtained, expanding the interlayer spacing to facilitate efficient lithium-ion transport and reduce battery internal resistance. Next, through polar gradient dispersion and high-pressure homogenization, the two are mixed with other components to obtain a premixed slurry. Polyether-modified silicone oil is added to the premixed slurry to obtain a mixed slurry. The mixed slurry is then coated on both sides of a pretreated PE separator and cured in stages to obtain a reinforced separator material for power batteries. This achieves strong interfacial bonding, high mechanical strength, and high thermal stability in the separator material.

The invention discloses a microporous carbon-coated core-shell nano composite material, a preparation method and application, and relates to the technical field of lithium batteries, and the preparation method comprises the following steps: uniformly dispersing silicon powder and graphite in a solvent to form a core material suspension; dopamine hydrochloride and hydrogen peroxide are added into the nuclear material suspension, polymerization reaction is carried out at the temperature of 60-85 DEG C, composite slurry is obtained, and the ratio of the total mass of the silicon powder and the graphite to the mass of the dopamine hydrochloride is 1: (0.1-0.5); carrying out spray drying treatment on the composite slurry to obtain precursor powder; sintering the precursor powder at high temperature to obtain a microporous carbon coated core-shell nano composite material; the microporous carbon-coated silicon / graphite core-shell nano composite material is prepared by adopting a polydopamine in-situ polymerization technology initiated by hydrogen peroxide and combining a subsequent spray drying and carbonization process, and the material has good rate capability, cycling stability, charge-discharge efficiency and low interface impedance.

The invention provides a secondary battery and electric equipment. The secondary battery comprises a positive pole piece, a diaphragm and a negative pole piece, the negative pole piece comprises a negative current collector and a negative active layer arranged on at least one side surface of the negative current collector, and the negative active layer comprises a negative active material, a binder and a conductive agent; the negative electrode active material comprises graphite, the binder comprises gel modified styrene-butadiene rubber, the gel of the gel modified styrene-butadiene rubber comprises a polyacrylic acid chain segment, a polyethylene oxide chain segment, a poly (N-isopropylacrylamide) chain segment and a polyvinyl alcohol chain segment, and the effective ion transmission efficiency of the graphite is defined and screened, so that the effective ion transmission efficiency of the graphite is improved. And in combination with the binder, the electrolyte absorption and retention capability of the pole piece can be improved, the ionic conductivity can be improved, the diffusion impedance of ions can be reduced, the dynamics can be improved, and the cycle performance of the secondary battery can be improved.

The application discloses a kind of multi-lithium salt composite organic electrolyte suitable for low temperature environment, comprising: lithium salt system and organic solvent system;Wherein, the lithium salt system includes lithium tetrafluoroborate, lithium bisfluorosulfonylimide and lithium bis (oxalate) borate;Organic solvent system includes carbonate solvent, linear ether solvent and weak solvent molecule;The application aims at providing a kind of multi-lithium salt composite organic electrolyte suitable for low temperature environment, can have good ion transport capacity, interface stability and cycle life under low temperature environment, can maintain higher reversible capacity and stable charge-discharge platform, capacity decay rate is significantly slowed down, meet the application demand of high reliability and high stability of low temperature lithium ion battery.

The present application relates to the technical field of caffeine extraction, and particularly relates to a device and a method for supercritical high-efficiency extraction of caffeine in coffee beans; the device can optimize the internal structure of an extraction kettle, greatly prolong the effective travel of supercritical CO2 fluid in the kettle, improve the fluid utilization rate and the caffeine extraction efficiency, realize high-efficiency extraction of caffeine, improve the quality of caffeine coffee products, and improve the production economy and environmental protection; the device comprises a CO2 storage tank, a high-pressure pump, a heat exchanger, an extraction kettle, a separation kettle and a crystallization kettle; the CO2 storage tank is used for feeding supercritical CO2 into the extraction kettle; the high-pressure pump and the heat exchanger are used for adjusting the gas inlet pressure and the gas inlet temperature of CO2 into the extraction kettle; the extraction kettle is used for extraction of whole coffee beans; the separation kettle is used for separation of crude caffeine; the crystallization kettle is used for fine crystallization of crude caffeine; and the extraction kettle is provided with an "S"-shaped flow channel for prolonging the travel of coffee beans in the extraction kettle.

The invention discloses a fast-charging high-voltage positive electrode material and a preparation method thereof, and the preparation method comprises the following steps: 1, carrying out a co-precipitation reaction on a first feed liquid containing nickel ions, cobalt ions and manganese ions to obtain a slurry I; step 2, adding a second feed liquid containing nickel salt, cobalt salt and manganese salt into the slurry I, and carrying out a co-precipitation reaction to obtain slurry II; step 3, adding a third feed liquid containing nickel salt, cobalt salt and manganese salt into the slurry II, and carrying out a co-precipitation reaction to obtain slurry III; 4, the gradient cobalt-rich precursor, a lithium source and a high-entropy doping source are mixed and then subjected to calcination treatment, and a doped gradient cobalt-rich matrix is obtained; and fifthly, the surface of the doped gradient cobalt-rich matrix is coated with a coating, and then calcination treatment is conducted. Through the gradient multi-element doping technology, the doping uniformity of elements in the inner layer and the outer layer of the material is guaranteed, and the rate capability and the high-temperature stability of the material are remarkably improved.

The invention relates to the technical field of lithium ion batteries, in particular to a gradient cobalt-rich ternary positive electrode material and a preparation method and application thereof. The invention discloses a gradient cobalt-rich ternary positive electrode material which comprises a nickel-cobalt-manganese base material, and the base material comprises a first doping element, a second doping element and a third doping element. In the matrix material, the content of Co element is gradually increased from the core to the shell of the material. According to the invention, the precursor is subjected to cobalt-rich gradient design, so that the outer layer of the material has higher cobalt content, the dynamic performance of lithium ions of the material under high voltage is improved, the diffusion impedance of the lithium ions is reduced, and the dynamic performance of the lithium ions is remarkably improved, thereby improving the rate stability of the material.

The application discloses a kind of anion-rich hydrogel electrolyte and its preparation method and application.The hydrogel electrolyte is composed of acrylamide monomer, polymerizable functional monomer containing anion group, natural polymer material, and zinc salt for building water-based metal battery.In the preparation process, the above-mentioned functional monomer, acrylamide and natural polymer material are dissolved in zinc salt solution and uniformly mixed, and then initiator and crosslinking agent are introduced, and thermal polymerization reaction is carried out at 40~80℃ to obtain anion-rich gel electrolyte.The gel electrolyte shows good thermal stability, ion conductivity and cycle performance in various water-based metal batteries, providing a new electrolyte design strategy for high-performance water-based metal batteries.

This invention relates to the field of cathode materials for aqueous zinc-ion batteries, and discloses a Ce-α-MnO2 / CNTs nanowire, its preparation method and application, an aqueous zinc-ion battery cathode sheet and its preparation method, and an aqueous zinc-ion battery. The preparation method of Ce-α-MnO2 / CNTs nanowires includes: first mixing multi-walled carbon nanotubes, trivalent cerium salt, and manganese sulfate in the presence of an inorganic solvent to obtain a mixture I; second mixing potassium permanganate solution with the mixture I to obtain product I; subjecting product I to a hydrothermal reaction to obtain product II; and drying product II to obtain Ce-α-MnO2 / CNTs nanowires. The Ce-α-MnO2 / CNTs nanowires of this invention, as a cathode material, have a high specific capacity, can improve the charge and discharge rate of aqueous zinc-ion batteries, and thus enhance the overall performance of aqueous zinc-ion batteries.

This invention provides a nano-flower-like HZSM-5 molecular sieve, its preparation method, and its applications. The nano-flower-like HZSM-5 molecular sieve is an aggregate formed by assembling nanorod-shaped particles, and it contains mesopores. The cross-sectional diameter of the nanorod-shaped particles is 5–40 nm. This nano-flower-like HZSM-5 molecular sieve possesses advantages such as high catalytic activity, high selectivity for low-carbon olefins, and long service life.