9results about How to "Uniform particles" patented technology

The invention belongs to the technical field of dibromohydantoin production, and particularly provides a dibromohydantoin synthesis method which comprises the following steps: S1, preparing a raw material aqueous solution, namely respectively mixing dimethyl hydantoin, sodium bromide and liquid caustic soda NaOH with deionized water to form a dimethyl hydantoin aqueous solution, a sodium bromide aqueous solution and a liquid caustic soda NaOH aqueous solution; s2, premixing the raw material aqueous solution, namely mixing the aqueous solution of dimethyl hydantoin, sodium bromide and caustic soda liquid NaOH prepared in S1 to obtain a premix; s3, electrochemical in-situ bromination reaction: introducing the premix into a micro-channel reactor provided with an electrolysis electrode, and applying current to the premix to obtain a dibromohydantoin initial solution; and S4, crystallizing, separating and drying the product, carrying out cooling crystallization through a three-stage stepped cooling method to obtain a dibromohydantoin crystal, carrying out centrifugal separation to obtain a dibromohydantoin wet product, and then drying to obtain a dibromohydantoin finished product. The method can improve the generation stability and the product quality of the dibromohydantoin.

The application provides a BiFeO3-graphitic carbon nitride photocatalyst and a preparation method and application thereof, relates to the field of photocatalysis technology, and the preparation method comprises the following steps: dissolving a bismuth source and an iron source in a solvent, mixing with a mineralizer, and performing a hydrothermal synthesis reaction to obtain BiFeO3; performing first calcination treatment on a nitrogen-containing organic precursor to obtain graphitic carbon nitride; and performing grinding treatment and second calcination treatment on the mixture of BiFeO3 and graphitic carbon nitride to obtain the BiFeO3-graphitic carbon nitride photocatalyst. The preparation method can construct a Z-type heterojunction at the interface of the separately prepared BiFeO3 and graphitic carbon nitride, form an internal electric field, efficiently separate photo-generated electrons and holes, effectively inhibit the recombination of the photo-generated electrons and holes, finally significantly enhance the redox capacity of the material, and make the material exhibit excellent photocatalytic performance, high selectivity and good cycle stability.

This invention relates to the field of ion sieve technology, providing a titanium-based lithium-ion adsorbent, its preparation method, and its applications. The invention involves pyrolyzing NH2-MIL-125(Ti), then mixing it with lithium carbonate for calcination, granulating it using an ethylene-vinyl alcohol copolymer as a binder, and finally acid washing to obtain the titanium-based lithium-ion adsorbent. This invention integrates metal-organic framework (MOF)-derived carbon intercalation, nitrogen doping, and polymer-assisted granulation into a single process, preparing a particulate adsorbent with a hierarchical porous structure, strong hydrophilicity, and abundant active sites, showing great potential for industrial applications. Example results show that the adsorbent of this invention, under conditions of pH=12 and 25℃, exhibits a high Li-ion concentration of 24 h. + The adsorption capacity reached 33.95 mg / g. After five cycles of adsorption and desorption, the adsorption capacity could still reach 96.9% of the initial adsorption capacity, and the titanium dissolution loss in each cycle was only about 0.4%.

This invention belongs to the field of peroxide production technology, specifically relating to a continuous production apparatus and method for lauroyl peroxide. The continuous production apparatus for lauroyl peroxide includes a primary reactor, to which a secondary reactor, a tertiary reactor, and a filter tank are sequentially connected. Each of the primary, secondary, and tertiary reactors is equipped with a stirrer, with a spiral plate threaded onto its upper part. A motor is connected to the top of the stirrer. A conveyor belt is installed inside the filter tank, and a mother liquor outlet is located in the center of the bottom plate. The bottom plates on both sides of the mother liquor outlet are inclined. A primary washing tank, a secondary washing tank, and a tertiary washing tank are sequentially connected to the filter tank. Each of the primary, secondary, and tertiary washing tanks is equipped with a filter screen and a sprayer. This invention employs a multi-reactor series continuous production process, resulting in higher production efficiency and more stable operation.

The utility model relates to ink processing technical field, the utility model provides a kind of high-efficiency sand mill for ink processing, it includes base, the top of base is fixedly connected with sand mill, the top one side of sand mill is fixedly connected with feed pipe, the top inner wall of feed pipe is fixedly connected with discharge pipe, the top of discharge pipe is fixedly connected with pretreatment box, worm drives worm wheel rotation and further drives transmission shaft rotation, reduce by worm and worm wheel, transmission shaft rotation drives incomplete gear rotation, rack drives movable rod and baffle to move, baffle movement makes the shielding failure of discharge pipe, material is ground into sand mill by feed pipe, when rack and incomplete gear do not contact, spring reset drives movable rod reset, and further makes baffle reset and shields discharge pipe, realizes intermittent feeding. By the above technical scheme, the technical problem of low processing efficiency in the prior art is solved.

This invention discloses a method for low-temperature pressing purification and dewaxing of Torreya grandis kernels, comprising at least the following steps: S5.1 Pre-preparation of a composite filter layer: After pre-cooling the filter chamber of a vacuum filtration device, a filter screen and a filter membrane are laid in sequence, and nitrogen is introduced to remove impurities; S5.2 Gradient negative pressure filtration: The initially dewaxed oil is injected into the filter chamber at low temperature, first pre-filtered at -0.05MPa to -0.06MPa for 10 minutes, then deep filtered at -0.08MPa to -0.09MPa for 20 to 30 minutes to retain trace wax crystals; S5.3 Nitrogen purging to remove water: The dewaxed oil is introduced into a low-temperature oil storage tank, and nitrogen is continued to be introduced to remove water and prevent oxidation; S5.4 Finished product fine filtration: The dewaxed oil is slowly heated and then finely filtered through a filter screen to obtain Torreya grandis finished oil. Gradient negative pressure filtration retains trace wax crystals in Torreya grandis oil. This invention employs a gradient negative pressure dewaxing step, which ensures sufficient driving force to accelerate the filtration speed and utilizes the formed filter cake layer as a secondary filtration medium to efficiently retain trace amounts of residual wax crystals. This approach ensures a high dewaxing rate while shortening the filtration time and improving production efficiency.

A kind of high-temperature evaporation equipment for manufacturing nanometer metal powder, including water-cooled barrel shell, water-cooled hemispherical shell, evaporation chamber, cooling water inlet A, cooling water cavity A, cooling water inlet C, plasma cathode column, cooling water inlet D, hemispherical shell cooling water passage, cooling water inlet B, crucible wall petal, cooling water outlet A, plasma anode terminal stud, crucible bottom, cooling water outlet B, hemispherical shell cooling water passage, barrel shell cooling water passage;Its characterized in that: the upper portion of hemispherical shell cooling water passage is equipped with cooling water cavity A;Due to the effect that the hemispherical shell cooling water flow channel of high-temperature evaporation equipment is equipped with cooling water cavity A, the gathered water can be effectively and evenly distributed to hemispherical shell cooling water flow channel and barrel shell cooling water flow channel, so that the cooling efficiency of hemispherical shell cooling water flow channel is high, which is conducive to the evaporation of metal vapor, thereby promoting the production quality of nanometer metal powder;The service life of high-temperature evaporation equipment is improved.

The utility model discloses a multilayer screening device for peanut processing, including base, the top fixed mounting of base has the screening box, the top fixed feed hopper of screening box, the inside slide mounting of screening box has upper limit position bottom plate and lower limit position bottom plate, the top of upper limit position bottom plate is located and has upper filter box, the bottom slide mounting of upper filter box has first filter screen plate, the top of lower limit position bottom plate is located and has lower filter box, the both sides below the ball are all provided with fixed wheel, the outside fixed connection of fixed wheel has hydraulic telescopic handle. Compared with prior art device, through hydraulic telescopic handle can drive fixed wheel and carry out horizontal direction's relative movement, can pass the both sides of ball in turn in the process of fixed wheel movement, because the height difference of ball and both sides, thereby can make upper limit position bottom plate and screening box and take place up and down and shake, and two mesh diameter different upper filter boxes can filter and screen peanuts in turn.

The application discloses a cobalt-iron catalyst and a preparation method and application thereof. The cobalt-iron catalyst is composed of iron elements, cobalt elements, metal element A and metal element B; the metal element A is at least one selected from Mn, Cu, Zn, Ti, Al, Cr, Ni, Ce and Zr; the metal element B is at least one selected from Li, Na, K, Rb, Cs, Be, Mg, Ca, Sr and Ba; in the cobalt-iron catalyst, the metal elements exist in the form of elements, oxidation states or carbonization states; in the cobalt-iron catalyst, taking the total mass of the metal elements as 100 wt%, the content of the iron elements is 30-99 wt%, the content of the cobalt elements is 30-99 wt%, the content of the metal element A is 0.1-60 wt%, and the content of the metal element B is 0.01-50 wt%.