107results about How to "Enhanced mass transfer" patented technology

This invention relates to the field of air pollution control technology, and in particular to a spray tower for effectively purifying air pollution. The spray tower includes an air inlet fixed to the bottom of one side, a suction hood fixed to the upper surface of the spray tower, and an exhaust pipe fixed to the top of the suction hood. An anti-clogging recovery component and a spraying mechanism are installed inside the spray tower, and a collection box is fixed to one side of the spray tower corresponding to the position of the anti-clogging recovery component. This invention utilizes a spray pipe mechanism to enhance the rate of the neutralization reaction through the synchronous rotation of a rotating disk and a rotating block, and enhances the spatial separation of the two solutions through centrifugal force, reducing cross-mixing. This avoids ineffective neutralization of acid and alkali solutions and achieves continuous and efficient treatment. Combined with the anti-clogging recovery component, the activated carbon balls inside the fixed cylinder are promptly recovered and cleaned, ensuring that efficiency is not reduced due to clogging during air pollution purification, and preventing ineffective adsorption of activated carbon balls due to prolonged use.

The utility model relates to a reaction kettle which comprises a kettle body and a driving mechanism arranged on the kettle body, a guide cylinder and a stirrer linked with the driving mechanism are arranged in the kettle body, a plurality of transverse baffle rings are arranged on the inner circumferential wall of the guide cylinder, and a plurality of openings positioned on the lower side of each transverse baffle ring are formed in the circumferential wall of the guide cylinder. An annular frame linked with the driving mechanism is further rotatably arranged on the peripheral wall of the flow guide cylinder, a plurality of arc-shaped plates capable of covering the openings are arranged on the annular frame, the number of the arc-shaped plates corresponds to that of the openings, and when the annular frame rotates, the arc-shaped plates alternately open or close the openings, so that the flow in the flow guide cylinder flows from top to bottom under the action of the stirrer, and the flow in the flow guide cylinder is uniform. The flowing sectional area of the fluid at each transverse baffle ring is shrunk and expanded, so that the fluid is accelerated and then decelerated, and multi-stage shearing and turbulent flow are generated; meanwhile, the opening circulation on the guide cylinder is opened and closed, so that the dynamic change of the flow field structure between multi-stage shunting circulation and single bottom return is realized, and the mixing efficiency of the reaction kettle is improved.

The invention provides an electrochemical method, an electrode and a system for synthesizing hydrogen peroxide without aeration, and relates to the technical field of electrochemical preparation of hydrogen peroxide. The multistage hole penetrating type cathode with a specific multistage hole channel structure is adopted, the oxygen-containing electrolyte penetrates through the multistage hole penetrating type cathode for electrochemical reaction under the non-aeration condition, dissolved oxygen in fluid is forced to make efficient contact with catalytic active sites through the multistage hole channel structure, the mass transfer process is greatly enhanced, and the catalytic activity of the catalyst is improved. And the diffusion limitation of the traditional flow-through electrode is overcome. And meanwhile, the structure required for synthesizing hydrogen peroxide is simplified by an aeration-free operation mode, and the energy consumption and the cost are reduced. Finally, through the synergistic effect of the technical characteristics, the high-yield and high-flux synchronous output of hydrogen peroxide can be realized under the condition that an expensive catalyst and external gas aeration are not needed.

The invention belongs to the technical field of anhydrous magnesium chloride production, and particularly relates to a preparation process of anhydrous magnesium chloride, which comprises the following steps: firstly, dissolving magnesium chloride hexahydrate in absolute ethyl alcohol to form a magnesium chloride ethanol aqueous solution, and then dehydrating the magnesium chloride ethanol aqueous solution by using a molecular sieve to obtain the magnesium chloride ethanol solution; carrying out secondary cooling, stirring crystallization, secondary solid-liquid separation and vacuum drying on the magnesium chloride ethanol solution to obtain high-purity anhydrous magnesium chloride; and recycling ethanol liquid obtained by solid-liquid separation and ethanol gas obtained by vacuum drying. The technical scheme provided by the invention is simple in process flow, low in energy consumption, low in equipment requirement, high in product yield and high in purity, and can be directly applied to the fields of electrolytic preparation of magnesium, catalyst carriers and the like.

The invention discloses a method for selectively separating valuable metals from a positive electrode material of a waste lithium battery, and belongs to the technical field of resource recycling of waste lithium ion batteries. The method comprises the following steps: preparing an aprotic deep eutectic solvent (DES) as a leaching agent and an electrolyte at the same time; the method comprises the following steps: adding a waste positive electrode material into DES, and leaching to obtain a DES leaching-electrolyte system; according to the method, the pulse voltage is applied in stages, selective separation of nickel, cobalt and manganese is achieved by controlling the pulse peak voltage (the first stage is-0.8 V to-1.0 V, the second stage is-1.0 V to-1.2 V, and the third stage is-1.2 V to-1.5 V), and the pulse frequency and the duty ratio are used for regulating and enhancing mass transfer and restraining side reactions. According to the method, the metal deposition potential difference is expanded through DES coordination regulation and control, efficient selective separation of nickel, cobalt and manganese is achieved in combination with pulse step-by-step voltage control, and the method has the advantages of being high in separation efficiency, few in side reaction, simplified in process, high in product purity and the like.

The invention provides a method for continuously and efficiently synthesizing 2, 6-diamino piperazine-1-oxide, which comprises the following steps: S1, preparing an N-nitroso iminodiacetonitrile solution at room temperature, and stirring and dissolving for 5 minutes; s2, sequentially adding hydroxylamine salt and alkali into a solvent, stirring at room temperature for 10-15 minutes for pre-dissolving, adding a proper amount of metal salt catalyst into the obtained solution, and continuously stirring for 5-10 minutes; s3, exhausting the continuous tubular reactor by using a hydroxylamine solution until the continuous tubular reactor is full of the solution; s4, feeding the N-nitrosoiminodiacetonitrile solution and the hydroxylamine solution into a continuous tubular reactor through a mixer according to a certain proportion by adopting a delivery pump, and optimizing the flow velocity and temperature of the reaction solution and the pressure in the continuous tubular reactor; and S5, enabling the reaction liquid to flow out from an outlet of the continuous tubular reactor, performing suction filtration, washing a filter cake with an alcoholic solution, and drying. The method can obviously improve the reaction rate, reduce the generation of impurities and improve the production efficiency.

The application discloses a micro-bubble stripping device and application thereof in ammonia-nitrogen wastewater treatment. The device comprises a micro-bubble dispersion device, an absorption device and a gas-liquid separation device which are connected by pipelines in sequence. The micro-bubble dispersion device is filled with Janus hollow fiber membranes. The inner diameter of the Janus hollow fiber membranes is 0.1-2.0 mm, the wall thickness is 0.05-0.6 mm, the pore size is 0.05-2.0 um, the water contact angle of the hydrophilic layer is less than 65 DEG, and the water contact angle of the hydrophobic layer is greater than 110 DEG. Air is dispersed into micro-bubbles and contacted with ammonia-nitrogen wastewater. The micro-bubbles have the advantages of large specific surface area, high mass transfer efficiency and long gas-liquid contact time, so that the mass transfer of ammonia-nitrogen in water to gas phase is strengthened, the gas-liquid ratio is reduced, the energy consumption in the stripping process is reduced, and the equipment investment and operation cost in the stripping process are reduced.

The present application relates to a kind of equipment and method for producing cyclohexanone by oxidizing cyclohexene with adipic acid production exhaust gas, raw gas A containing nitrous oxide in adipic acid production line is entered into raw gas A storage tank, then enter the deoxygenation device of pressure swing adsorption and remove oxygen, enter raw gas B storage tank, enter adipic acid production exhaust gas measuring tank;Through nitrogen tank, cyclohexene measuring tank, adipic acid production exhaust gas measuring tank, high-pressure heat exchanger, high-pressure preheater, fixed bed reactor, high-pressure cooler, high-pressure separator, deep cooling gas discharge tank and low-pressure separator processing generates cyclohexanone.The main purpose product cyclohexanone is generated, the selectivity of cyclohexene to cyclohexanone is greater than 98.0%, the conversion rate of nitrous oxide is greater than or equal to 99.9%, the exhaust gas containing nitrous oxide in adipic acid production line is only treated by removing oxygen, other gases contained do not need to be separated, the gas part of process device high-pressure separator refluxes in certain proportion, more stable.

The present application relates to the technical field of battery preparation, and more particularly to a dry method multi-layer composite electrode film, a preparation method thereof, an electrode sheet and a battery. The dry method multi-layer composite electrode film comprises an electrolyte induction layer, an active material layer, a structure layer and a buffer layer. The electrolyte induction layer is formed by a polar organic high-molecular cross-linked organic film base material, and the electrolyte is better infiltrated into the electrode interior through the attraction of polar molecules to the electrolyte. The structure layer is supported by a high-strength organic film, which improves the structure and tensile strength of the dry method electrode self-supporting film. The buffer layer is formed by an elastic organic high-molecule film, which sets an elastic buffer layer for the multi-layer electrode sheet structure, plays a buffering role when the active material particles swell and shrink, and prevents the destruction of the PTFE fiber filament structure or the electrode sheet structure caused by the volume change of the particles. The present application solves the problems of low mechanical tensile strength, poor electrolyte infiltration and weak volume change resistance in the prior art.

This invention discloses a high-efficiency separation device and method for oily sludge. The device includes a shell, within which, from top to bottom, are sequentially arranged interconnected strong mixing and dispersion unit, thermal vibration polymerization unit, and three-phase separation unit, respectively used for primary demulsification of strong mixing and dispersion, secondary demulsification of thermal vibration polymerization, and three-phase separation of oily sludge. By integrating the strong mixing and dispersion unit, thermal vibration polymerization unit, and three-phase separation unit into a single device, this invention efficiently solves the technical problem of difficult efficient separation of oily sludge in the prior art. It features small footprint, compact design, low maintenance cost, stable and reliable operation, strong adaptability, low secondary pollution, and high separation efficiency.

The application discloses a SiC reactor for cyclohexanone aminooxidation and a design method thereof, and relates to the technical field of chemical reactors. The SiC reactor comprises a reactor shell, a plurality of reaction channels, a plurality of composite plates, and a plurality of reaction channels. The axis direction of the reaction channel is parallel to the axis direction of the reactor shell. The plurality of composite plates are arranged in the plurality of reaction channels. The flat plate and the corrugated plate made of silicon carbide are arranged in the axial direction of the reaction channel and matched with the rhombic through-hole structure. The fluid in the reaction channel can be disturbed, the radial diffusion effect of the fluid is improved, and the effective residence time of the fluid is prolonged. Based on the excellent heat conduction performance of silicon carbide and the plate combination structure, the heat exchange between the wall surface and the fluid is strengthened, the temperature field distribution in the channel is optimized, the mass transfer and heat transfer conditions of the material are improved, and the generation effect of cyclohexanone oxime is improved.

The invention discloses a metal composite molecular sieve catalyst and a preparation method and application thereof. The metal composite molecular sieve catalyst provided by the invention comprises the following components in percentage by mass: a) 50-95% of a metal-loaded micron ZSM-5 molecular sieve; b) 5-50% of a nano molecular sieve; wherein the metal is selected from at least one of zinc, gallium, silver, copper, nickel or molybdenum. The catalyst provided by the invention is used in a methanol-to-light aromatic hydrocarbon reaction, and has the advantages of high catalytic activity, high light aromatic hydrocarbon yield, good stability and the like.

The invention discloses a multi-stage plate-type electro-catalytic membrane reactor for degrading organic matters in reverse osmosis concentrated water of coking wastewater and application of the multi-stage plate-type electro-catalytic membrane reactor. The multi-stage plate-type electro-catalytic membrane reactor is internally provided with a chamber for electrochemical reaction, and consists of a plurality of cathode chambers and anode chambers which are the same in number and are uniformly alternated, a conductive contact pin, a water inlet end and a water outlet end, the distance between every two cavities is 10 mm, the multiple cathode chambers and the multiple anode chambers which are the same in number and are evenly and alternately arranged are detachable plate faces, operation is convenient, and environment friendliness is achieved. The multi-stage plate-type electro-catalytic membrane reactor is simple in design, wastewater runs in the reactor in a circulation mode, mass transfer can be improved, the electrochemical active surface area can be increased, the current utilization efficiency can be improved through a parallel power connection mode, and the service life of the reactor is prolonged. The device has the advantages of high organic matter removal efficiency, convenience in actual operation, automatic management, good stability, low operation energy consumption, reusability and the like, and has research significance in the field of electrochemical water treatment.

The invention discloses gallium ion imprinted amidoxime-based macroporous resin as well as a preparation method and application thereof, and belongs to the technical field of functional polymer materials and separation. The method comprises the following steps: pre-assembling a gallium trichloride template and monomers such as acrylonitrile, generating monodisperse liquid drops by utilizing a microfluidic technology, polymerizing by combining ultraviolet light, eluting the template by hydrochloric acid, and performing amidoximation modification by a hydroxylamine hydrochloride alkaline solution, thereby obtaining the resin. The resin is a monodisperse spherical microsphere, has a macroporous structure, has high selective recognition capability and high adsorption capacity on gallium ions, is fast in adsorption kinetics and good in regeneration performance, and is suitable for selectively separating or enriching gallium ions from a complex solution system.

This invention belongs to the field of photocatalyst materials technology, specifically relating to a three-dimensional graphene aerogel photo-self-propelled Fenton catalyst, its preparation method, and its application. The preparation method includes: mixing a graphene dispersion containing ethylenediamine with a phenolic resin prepolymer containing ferrocene, phenols, and an alkaline catalyst; followed by a one-step hydrothermal reaction, washing, and freeze-drying to obtain the three-dimensional graphene aerogel photo-self-propelled Fenton catalyst. This catalyst can be used to degrade organic pollutants in water under visible light irradiation.

The invention provides a proton exchange membrane electrolysis water membrane electrode and a preparation method thereof. The proton exchange membrane electrolysis water membrane electrode comprises a proton exchange membrane, an anode catalyst layer and a cathode catalyst layer, the anode catalyst layer contains an anode catalyst and an ionomer sub-conductor; based on the area of the anode catalyst layer, the content of Ir is 0.02-2.0 mg / cm < 2 >; the mass ratio of the ionomer sub-conductor to the anode catalyst is (1: 2)-(1: 10); the anode catalyst is a ruthenium-iridium-terbium nano-catalyst, the molecular formula of the ruthenium-iridium-terbium nano-catalyst is Tb2RuxIr (2-x) O7, 0 lt; xlt; 2. According to the membrane electrode and the preparation method thereof provided by the invention, the catalyst layer in which noble metals are uniformly distributed can be obtained, and the membrane electrode catalyst layer is uniform and consistent in microstructure and good in continuity, so that the water electrolysis activity and stability of the membrane electrode catalyst layer are favorably improved.

The utility model relates to primary amine production technical field, concretely is primary amine rectification purification system. Primary amine rectification purification system, including storage tank, storage tank is connected with rectifying column through heat exchanger, and the bottom of rectifying column is connected with membrane evaporator through pipeline, and the inside of rectifying column is equipped with primary condenser, and rectifying column is connected with gas -liquid separation tank through secondary condenser. The system is through the additional membrane evaporator, and the liquid phase material of rectifying column bottom discharge is handled again. The unique structure design of membrane evaporator makes it can distribute liquid material into film shape evenly, greatly increases evaporation area, strengthens mass transfer process, further separates the primary amine and impurity remaining in liquid phase, significantly improves the purity of product, satisfies the strict requirement of high -end application field to primary amine high purity.

The application discloses a chemical hydrocracking catalyst and a preparation method and application thereof. The chemical hydrocracking catalyst contains 25-60%, preferably 30-50% of modified EMT molecular sieve based on the weight of the catalyst, and the modified EMT molecular sieve has the following properties: a silicon-aluminum ratio (molar ratio of SiO2 / Al2O3) of 10-30, preferably 15-20, a pyridine infrared acid amount of 0.5-1.2 mmol / g, preferably 0.7-1 mmol / g. The preparation method of the hydrocracking catalyst comprises mixing the modified EMT molecular sieve, a binder and a hydrogenation active metal to obtain the chemical hydrocracking catalyst or loading the hydrogenation active metal on the modified EMT molecular sieve and the binder after shaping to obtain the chemical hydrocracking catalyst. The hydrocracking catalyst has the advantages of high reaction activity, high product liquid yield, high heavy naphtha fraction yield, high aromatic potential of the heavy naphtha, low tail oil BMCI value and the like in a heavy oil hydrocracking process.

This invention discloses a method for preparing functional carbon materials with atomically dispersed Lewis acid-base sites, comprising: (1) polymer preparation to obtain a polymer sample; (2) polymer modification to obtain a modified polymer sample; (3) polymer carbonization: the modified polymer sample is heat-treated in a non-oxidizing atmosphere to carbonize the modified polymer sample; after carbonization, the system is naturally cooled; then, after washing and drying, the target functional carbon material is obtained. This invention utilizes atomically dispersed Lewis acidic metal sites and basic N sites to modify carbon materials in situ. The prepared functional carbon material has a large specific surface area, well-developed pore structure, abundant acid-base sites, and an atomically distributed structure, which can significantly improve the density of functional sites on the surface of the carbon material and its adsorption efficiency for boron, phosphorus, and metal impurities. Its application in the purification of chlorosilanes can greatly reduce the load of subsequent distillation and impurity removal, and improve the yield and quality of high-purity chlorosilanes.

The application discloses a seabed carbon dioxide hydrate storage device and method, and relates to the technical field of deep-sea carbon storage. The storage device comprises a nozzle main body, a rotational flow cavity and a cavitation cavity are sequentially arranged in the nozzle main body along the liquid flow direction, the rotational flow cavity is used for applying rotational flow shearing action to liquid carbon dioxide, and the cavitation cavity is used for reducing the local pressure of the liquid flow to make the liquid carbon dioxide generate cavitation bubbles and make the cavitation bubbles collapse through subsequent pressure recovery. Through two-stage crushing and atomization of rotational flow and cavitation, the liquid drops can be crushed into smaller liquid drops, the hydrate nucleation energy barrier is reduced, the nucleation induction time is shortened, the mass transfer boundary layer on the surface of the liquid drops is destroyed, the continuous hydrate shell layer is rapidly generated on the surface of the liquid drops, the density inversion settlement is triggered, the floating diffusion risk of the carbon dioxide is further inhibited, and the storage efficiency and stability are improved.

This invention relates to a flow-type electrolysis device for enhancing carbon dioxide mass transfer and its application, comprising: a clamping assembly including a first clamping plate and a second clamping plate; at least one set of electrode assemblies, each including a cathode plate and an anode plate, the cathode plate being connected to the first clamping plate and the anode plate being connected to the second clamping plate, the cathode plate having a cathode medium outlet and a cathode medium inlet, and the anode plate having an anode medium outlet and an anode medium inlet; and a bipolar plate located between the cathode plate and the anode plate; wherein the diameter of the bipolar plate outlet is smaller than the diameter of the bipolar plate inlet. This invention utilizes the electrolyte flow characteristics to solve the problems of difficult water management and poor stability caused by salt deposition in traditional membrane reactors, ultimately achieving both high current density and stability in the electrocatalytic reduction of carbon dioxide. This enhances the carbon dioxide mass transfer process.

The application discloses a preparation method of a pyrrolidone derivative. Under the action of a non-precious bimetallic multifunctional catalyst, an acetylenic acid derivative shown in formula I is reacted with an amine, a nitro compound or a nitrile compound shown in formula II in a reaction solvent under the heating and stirring of hydrogen gas to prepare a pyrrolidone derivative shown in formula III, and a reaction formula is as follows: the non-precious bimetallic multifunctional catalyst is a nitrogen-doped carbon-based carrier NC derived from a metal-organic framework material ZIF-8 and an effective active ingredient embedded on the carrier NC; the effective active ingredient comprises two metals, one metal is Co, and the other metal is any one of Ni or Cu. The yield of the pyrrolidone derivative synthesized by the method can reach 77% to 100%. The method has the advantages of simple process, high selectivity of the target product, cleanness and environmental protection, small catalyst consumption, low cost, simple catalyst preparation, high catalytic stability and suitability for industrial production.

This invention belongs to the field of electrode material technology, specifically relating to an anode foil, its preparation method, and an aluminum electrolytic capacitor. The preparation method of the anode foil includes performing a secondary porosimetry etching on the aluminum foil after primary porosimetry etching. The secondary porosimetry etching includes multiple stages of porosimetry etching, with a mid-treatment process between each adjacent stage. This preparation method involves multiple stages of porosimetry etching, and the mid-treatment process between each adjacent stage effectively increases the pore size of the etched foil, making it suitable for preparing ultra-high voltage anode foils with low loss and high specific capacitance.

This invention discloses an alumina-based catalytic ceramic membrane loaded with a high content of iron oxide, its preparation method, and its application, belonging to the technical field of inorganic functional ceramic microfiltration membranes and their preparation. This invention solves the problems of low catalyst loading limiting the catalytic activity of existing catalytic ceramic membranes, as well as the complex and costly preparation processes. In preparing the alumina-based ceramic membrane, this invention adds silica to generate a liquid phase during sintering to promote sintering, and adds the catalyst α-Fe₂O₃ to the ceramic powder before sintering. A one-step co-sintering method is used to prepare a ceramic membrane with catalytic function, simplifying the preparation process while increasing the α-Fe₂O₃ content on the surface and inside of the ceramic membrane, utilizing Fe… 3+ It activates the crystal lattice and promotes sintering. Furthermore, with the increase of α-Fe2O3 addition, small pores are expelled during sintering, pore walls shrink, large pores are generated, the pore size of the ceramic membrane gradually increases, and the permeation flux of the ceramic membrane is improved.

The spray drying device comprises a bottom plate, the middle side of the upper end of the bottom plate is connected with a machine body, the lower side of the interior of the machine body is connected with a hot air pipe, and the lower side of the machine body is connected with a discharging pipe; an atomizer is arranged on the middle side of the upper end of the machine body, a stirring structure is connected to the middle side in the machine body, and the stirring structure comprises a connecting plate, a motor and a connecting wheel; and the connecting pipe is mounted on the outer side of the hot air pipe, the upper side of the connecting pipe is connected with a mounting plate, the outer side of the upper end of the mounting plate is connected with a flow guide plate, a scraping structure is mounted on the outer side of the mounting plate, and the scraping structure comprises a scraping plate and a fixing plate. According to the spray drying device for preparing the enrofloxacin water emulsion particles, the stirring structure is arranged, mass transfer can be promoted, the material uniformity can be guaranteed, and therefore the drying effect of enrofloxacin water emulsion is improved, and the scraping structure is arranged, so that the inner wall of the drying device can be cleaned.

The application belongs to the field of grinding wheel grinding, and provides a portable retractable grinding wheel ultrasonic electrolytic machining device and method, which comprises a driving shaft and a variable amplitude rod arranged coaxially, one end of the variable amplitude rod is movably abutted against a workpiece to be machined, and the other end is movably inserted into the driving shaft to form a gas pressure flow channel and an electrolyte flow channel which are not connected with each other in the driving shaft; a plurality of ultrasonic vibration devices are arranged on the outer wall of the variable amplitude rod in sequence along the axial direction of the variable amplitude rod, and the plurality of ultrasonic vibration devices are movably abutted against each other and used for generating high-frequency ultrasonic vibration. Compared with the prior art, the application has the advantages that the gas pressure is used to drive the outer diameter of the retractable grinding wheel to be away from the precision selection of a suitable retractable grinding wheel, and different machining requirements are adapted; meanwhile, the ultrasonic vibration and electrolytic machining operation are combined, the cutting force in the machining process is effectively reduced, the deformation and surface damage of the workpiece are reduced, the vibration energy is uniformly transmitted to the grinding wheel and the workpiece, and the machining precision and efficiency are ensured.

This invention discloses a method and apparatus for extracting tellurium from tellurium-containing materials, comprising the steps of: mixing a sulfur-containing leaching agent with the tellurium-containing material to obtain a mixed slurry; subjecting the mixed slurry to cyclone electrolysis to obtain an anodic precipitate and a cathode product; and purifying the cathode product to obtain cathode tellurium. This invention combines selective leaching and electrowinning recovery of metallic tellurium into a single process, and utilizes the synergistic oxidation of anodic electro-oxidation and oxygen generation during electrolysis to destroy the difficult-to-leach elemental and alloy components in the tellurium-containing material, achieving one-step selective and efficient separation of tellurium-containing materials and preparation of high-purity tellurium products. By employing cyclone electrolysis to prepare cathode tellurium, this invention avoids the adverse effects of slow solution flow leading to reduced current efficiency and increased concentration polarization in traditional tellurium electrolysis, shortens the tellurium electrolysis cycle, and reduces the required concentration of impurity elements in the electrolyte, offering advantages such as high selectivity, high current density, and high product purity.

A method for preparing a hydrodemetallization catalyst, belonging to the field of catalyst preparation technology, includes the following steps: impregnating spherical carbon particles with an iron-containing solution and drying them; mixing the dried carbon particles uniformly with alumina sol and forming droplets; drying and calcining the formed products to obtain an iron-modified alumina support; immersing the iron-modified alumina support in an organic ammonium solution for a first and second hydrothermal treatment; drying and calcining the treated products to obtain a treated alumina support; impregnating the treated alumina support with an active component impregnation solution; drying and calcining the impregnated support to obtain the hydrodemetallization catalyst. The catalyst prepared by this method exhibits high dehydrogenation, Ni removal, and V removal activity, while also possessing high tolerance for metal impurities. This catalyst is particularly suitable for the hydrotreating of heavy oil with high Ni impurity content.

This application discloses a multi-stage enhanced photocatalytic treatment device for odorous gases, belonging to the field of environmental protection and air pollution control technology. It includes a housing with an air inlet at the bottom and an air outlet at the top; and a multi-stage layered photocatalyst, comprising horizontal high-density layered photocatalysts and vertical high-density layered photocatalysts, each with at least one stage. The odorous gas is sequentially treated through the horizontal and vertical high-density layered photocatalytic reactors, resulting in uniform gas distribution, improved mass transfer in the photocatalytic reaction, and increased reaction efficiency.

The utility model relates to a reaction kettle for mixing a composite herbicide, and belongs to the field of herbicide production. The mounting shells are fixedly connected to the left side and the right side of the kettle body respectively, the air cylinders are fixedly connected to the inner bottom walls of the mounting shells, the fixing plates are fixedly connected to the top ends of piston rods of the air cylinders, the mounting plate is fixedly connected between the upper surfaces of the fixing plates on the left side and the right side, and a stirring structure for mixing herbicide is arranged on the upper surface of the mounting plate; the stirring structure comprises a servo motor fixedly connected to the upper surface of the mounting plate and a transmission rod fixedly connected to an output shaft of the servo motor. According to the reaction kettle for mixing the composite herbicide, through meshing transmission of the transmission gear and the driven gear, simultaneous rotation of the first stirring paddle and the second stirring paddles on the two sides is achieved, the rotation directions are opposite, and therefore three-dimensional fluid movement is formed; and comprehensive contact and rapid mixing of the raw materials are promoted.