17results about How to "Promote positive progress" patented technology

The invention discloses a preparation method and application of active cationic chitosan nanoparticles, which comprises the following steps: reacting a low-molecular chitosan triethylamine hydrogen sulfate ionic liquid ([(C2H5) 3NH] HSO4) solution with an aldehyde compound ethanol solution to form Schiff base protection on chitosan C2-site amino, and then reacting with 2, 3, 5, 6-tetramethyl-4-piperidine-2-one to obtain the active cationic chitosan nanoparticles. The preparation method comprises the following steps: carrying out nucleophilic substitution reaction on chitosan C6 in the presence of a basic catalyst by using 2, 3-epoxypropyl trimethyl ammonium chloride, then adding a chemical initiator, carrying out grafting reaction on chitosan C3 and acrylic acid, and then removing Schiff base protection on chitosan C2. Carboxylate anions of acrylic acid and cations of chitosan are subjected to cross-linking self-assembly through a hydrothermal reaction, and the chitosan nanoparticles which are high in stability, small in particle size, uniform in distribution and efficient and lasting in function are obtained. The prepared nanoparticles are high in reaction activity, contain a large amount of quaternary ammonium salt, amino dication groups and carboxyl groups, and have wide application prospects in the fields of dye adsorption, heavy metal adsorption, textile function finishing and the like.

The present invention discloses a pneumatic variable stiffness soft gripper based on a scissor lever mechanism, comprising: a mounting seat; a plurality of soft gripping fingers, the top ends of which are evenly fixed on the mounting seat, and a receiving groove is provided on the soft gripping fingers; a locking airbag, one side of which is fixed on a side groove wall of the receiving groove, and a flexible rack is fixed on the locking airbag; a telescopic scissor lever mechanism, which is arranged in the receiving groove, and a locking ratchet that can be meshed and connected with the flexible rack is installed on the telescopic scissor lever mechanism; and a plurality of soft driving airbags, one side of which is respectively fixedly connected with one side of the plurality of soft gripping fingers. The present invention utilizes the flexible bending and folding and retracting of the telescopic scissor lever mechanism, can passively adapt to the bending deformation of the soft gripper, realizes good rigid-soft coupling with the soft gripper, can make the soft gripper have good flexibility, and utilizes the locking of the locking ratchet and the flexible rack to improve the load capacity and stability of the soft gripper to grip objects.

The invention provides a method for preparing phosphonitrilic chloride trimer through reaction in an organic phase, and relates to the field of phosphonitrilic chloride trimer. The method for preparing hexachlorocyclotriphosphazene through reaction in the organic phase comprises the following steps: preparing pyridine hydrochloride, preparing a choline chloride / glycerol deep eutectic solvent, synthesizing hexachlorocyclotriphosphazene, and carrying out post-treatment. The method for preparing phosphonitrilic chloride trimer through reaction in the organic phase can effectively solve the problems that the reaction process is not easy to control, the reaction time is long, the reaction efficiency is low, and side reaction is easy to generate to generate a large number of by-products in the existing preparation method of phosphonitrilic chloride trimer, the post-treatment is simplified, and the yield is improved. The yield and the purity of the prepared phosphonitrilic chloride trimer are improved, and the generation of three wastes in the preparation process is reduced.

The invention relates to a membrane reactor for preparing methanol through hydrogenation catalytic conversion of CO2, which is characterized in that a Cu-ZnO-A1203-ZrO2 catalyst layer and an organic-inorganic hybrid SiO2 membrane are established in a unified system through an internal structure design, and the most reasonable distribution of the geometric structure of the reactor, the catalyst and the membrane is realized. Under the environment that the working temperature is 200-450 DEG C and the working pressure is 2-5 MPa, a special permeable membrane, namely an organic-inorganic hybrid SiO2 membrane, is creatively utilized to synchronously remove water vapor as a reaction byproduct in situ, so as to promote forward proceeding of the reaction. Meanwhile, the catalyst Cu-ZnO-A1203-ZrO2 can be effectively protected by the structure of the reactor, and the poisoning and inactivation probability of the catalyst is reduced. When the reactor disclosed by the invention is used in a specific experiment for preparing methanol by catalytic hydrogenation of CO2, namely under the conditions of 300 DEG C, 3 MPa and W / F of 10 hours, the conversion rate of CO2 is up to 27.64%, and the yield of methanol is 26.50%, which are respectively improved by 7.3 times and 7.1 times compared with the traditional fixed bed reactor.

The application discloses a Ru / CeO2-SiO2 catalyst for hydrogen production by ammonia decomposition and a preparation method thereof, and belongs to the technical field of catalyst preparation. The catalyst comprises an active component Ru and a carrier CeO2 / SiO2. The CeO2 nanoparticles are uniformly dispersed on the surface of SiO2 by using an electrostatic adsorption method, and the active component Ru nanoparticles are selectively loaded on the surface of CeO2. The CeO2 has a unique Ce 3+ -Ce 4+ The variable valence capacity can form rich oxygen vacancies. The generation of the oxygen vacancies is favorable to enhancing the interaction intensity between Ru and CeO2, improving the electronic structure of the Ru surface, activating reactants, optimizing reaction kinetics, and promoting the ammonia decomposition reaction. In addition, the Ru particles are only distributed on the surface of CeO2, and even if the CeO2 moves on the surface of SiO2 at high temperature, the active component Ru will not be agglomerated, so that the Ru / CeO2-SiO2 catalyst exhibits excellent ammonia decomposition reaction catalytic performance and good stability.

The invention discloses a preparation method and a preparation system of cyano olefine acid ester, and relates to the technical field of preparation of cyano olefine acid ester. The preparation method of the cyanoacrylate comprises the following steps: mixing cyanoacetate, a carbonyl compound, a first catalyst and a second catalyst in a container for condensation reaction to prepare the cyanoacrylate, rectifying the substances in the container to obtain a mixture containing the first catalyst and water; and separating the mixture containing the first catalyst and water to obtain the first catalyst, and introducing the first catalyst into the container. According to the technical scheme, in the reaction process, the byproduct water is continuously separated out, the first catalyst is recycled, and the recycled first catalyst is introduced into the container to continue to participate in the reaction, so that forward proceeding of a reaction system is promoted, the conversion rate and the yield of the reaction are improved, the reaction time is shortened, and the impurity content is reduced; the method can be used for solving the problems of low conversion rate, low yield and high impurity content in preparation of cyanoolefine acid ester.

The invention relates to the technical field of wood preservatives and insect repellents, and discloses a wood preservative and insect repellent and a preparation method thereof. The invention comprises the following steps: heating polyformaldehyde, acetone monomer and polyetheramine for reaction; acylation reaction of the reaction product to obtain an active agent; heating polyformaldehyde, acetone monomer and m-aminophenylacetylene for reaction to obtain an intermediate; adding benzyl azide to the intermediate under the action of tert-butyl alcohol and cuprous iodide to react to obtain a preservative; heating modified chitosan to react with activated diethyltriamine pentaacetic acid to obtain a modified chelating agent; adding the preservative to tetrahydrofuran for ultrasonic dispersion, adding the active agent and the modified chelating agent for ultrasonic dispersion, adding an insecticide and water for uniform stirring to obtain the wood preservative and insect repellent.

The utility model relates to the technical field of equipment for purifying lithium carbonate, in particular to an efficient carbonization tower for purifying lithium carbonate. The carbonization tower is specifically an internal circulation carbonization tower, a feeding port and a gas outlet are formed in the top of a tower body, and a lithium carbonate aqueous solution is introduced into the feeding port; a discharge hole and a gas inlet are formed in the bottom of the tower body, and carbon dioxide gas is introduced into the gas inlet. The carbonization barrel is sequentially provided with a heat exchange device, a stirring paddle, a sieve plate and a downcomer from bottom to top, wherein the sieve plate and the downcomer are non-uniformly arranged and play a role in flow penetration; and a catalyst is uniformly distributed on the sieve plate. The sieve plate holes and the catalyst are distributed according to the principle of denseness to sparseness from inside to outside. The high-efficiency carbonization tower disclosed by the utility model can effectively increase the gas-liquid reaction area and the reaction activity.

The invention belongs to the technical field of organic chemistry, and relates to a preparation method of 4, 6-dihydroxypyrimidine. Specifically, the preparation method of the 4, 6-dihydroxypyrimidine disclosed by the invention comprises the following steps: 1) carbonylation reaction; 2) amination reaction; 3) cyclization reaction; and 4) post-treatment process. The 4, 6-dihydroxypyrimidine is directly synthesized by adopting a one-pot method, the purification process of formamide is avoided, the atom economy is high, the raw materials are cheap and easy to obtain, the product purity and yield are high, and the method is suitable for industrial production.

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 invention provides a terahertz parametric source generation device based on pulse seed injection, which can be applied to the technical field of solid laser and nonlinear optical frequency conversion. The device comprises a laser synchronization unit which is used for carrying out light splitting on initial nanosecond pulse laser with the pulse width of nanosecond magnitude to obtain reflected nanosecond pulse laser and transmitted nanosecond pulse laser; the pumping laser generating unit is used for generating subnanosecond pulse pumping laser with the pulse width of subnanosecond magnitude according to the reflected nanosecond pulse laser and the auxiliary drifting effect; the seed laser source generation unit is used for carrying out wavelength adjustment on the transmission nanosecond pulse laser to obtain nanosecond pulse seed laser with nanosecond pulse width; and the terahertz parameter generation unit comprises a nonlinear optical crystal and is used for generating terahertz waves under the common irradiation of the subnanosecond pulse pumping laser and the nanosecond pulse seed laser so as to generate a terahertz parameter source.

The invention relates to the field of glutaraldehyde production, and discloses a tubular reaction device for preparing glutaraldehyde, the tubular reaction device comprises a kettle body, an upper partition plate horizontally arranged at the top of the kettle body and a lower partition plate horizontally arranged at the bottom of the kettle body, and a plurality of long-strip-shaped reaction tubes are uniformly arranged between the upper partition plate and the lower partition plate in a communicating manner; a plurality of rotating shafts in one-to-one correspondence with the reaction tubes are vertically and rotatably arranged at the top of the kettle body, stirring pieces matched with the reaction tubes are arranged at the bottoms of the rotating shafts, and a rotating mechanism for driving the rotating shafts to rotate is arranged at the top end of the kettle body; the reaction kettle has the effect of improving the temperature rise and heat dissipation efficiency of the reaction liquid.

The replaceable forceps group structure comprises a forceps rod and a forceps handle, the forceps handle comprises a fixed handle and a movable handle movably connected with the fixed handle, a connecting opening is formed in the end of the fixed handle, and one end of the forceps rod is clamped into the connecting opening; a transmission assembly connected with the movable handle is arranged in the fixed handle, a fixed head and a hinged movable head are arranged at the end, away from the clamp handle, of the clamp rod, a linkage rod connected with the end of the movable head is movably connected in the clamp rod, and the linkage rod and the transmission assembly are arranged in a linkage fit mode. Compared with the prior art, the replaceable forceps group structure has the advantages that operation is convenient, instrument preparation can be reduced, forceps heads can be replaced and used conveniently, and follow-up maintenance and cleaning are facilitated.

The application discloses a preparation method of a compact type ammonium manganese iron phosphate precursor, a positive electrode material and a battery. A phosphorus source is mixed with ammonia water, an alkali solution is added to adjust the pH to alkalinity, and then the mixture is mixed with manganese iron metal to obtain ammonium manganese iron phosphate monohydrate with a spherical or sea urchin shape, a primary particle size of 50-800 nm, a D50 of 10-30 um, and a tap density of the precursor of 0.6 g / cm 3 <TD<1.8g / cm 3 ,0.6m 2 / g<SSA<2.5m 2 / g. Further, the application discloses a lithium manganese iron phosphate positive electrode material prepared by using the ammonium manganese iron phosphate precursor prepared by the method, as a lithium battery material. The ammonium manganese iron phosphate precursor prepared by the application has low Na / S impurity content, high tap density and good product crystallinity.

The invention discloses a method for extracting lithium from a waste ternary positive electrode material, and belongs to the technical field of lithium battery recovery. The lithium extraction method comprises the following steps: S1, mixing a waste ternary material, elemental sulfur and a biomass carbon source, heating to a temperature T1 and a heat preservation time t1 in an inert gas atmosphere, then heating to a temperature T2 and a heat preservation time t2, and maintaining the inert gas atmosphere until cooling to room temperature to obtain a sintered product; s2, mixing the sintered product with water, adjusting the pH value, carrying out first stirring and water leaching, and filtering to obtain a first filter residue and a first lithium-containing solution; mixing the primary filter residue with water, adjusting the pH value, carrying out secondary stirring and water leaching, and filtering to obtain a secondary filter residue and a secondary lithium-containing solution; and mixing the primary lithium-containing solution and the secondary lithium-containing solution to obtain a lithium-containing mother solution, and purifying to obtain a recycled lithium material. According to the method, lithium can be efficiently extracted from the waste ternary material at low cost, and meanwhile, emission of pollutants such as acid waste gas is reduced.

The present invention discloses a device and method for synthesizing methane in a mixed ion conductor solid oxide electrolytic cell, which belongs to the field of methane synthesis. The technical scheme is as follows: a device for synthesizing methane in a mixed ion conductor solid oxide electrolytic cell, comprising a mixed ion conductor electrolytic cell, a first chamber and a second chamber separated from each other; the mixed ion conductor electrolytic cell comprises a first electrolytic cell and a second electrolytic cell; a catalyst is arranged in the second chamber; water vapor is input into the first chamber, and a first electrolysis reaction occurs in the first electrolytic cell to generate hydrogen and is discharged into the second chamber; carbon dioxide is input into the second chamber, and part of the carbon dioxide undergoes a second electrolysis reaction in the second electrolytic cell to generate carbon monoxide, and the carbon monoxide is discharged into the second chamber. The beneficial effects of the present invention are as follows: the device for synthesizing methane in a mixed ion conductor solid oxide electrolytic cell provided by the present invention promotes the methanogenic reaction to proceed in the forward direction, efficiently utilizes heat energy, has a simple structure, a compact layout, and strong practicality.

The invention belongs to the technical field of organic synthesis, and particularly relates to a 2-chloro-4, 6-dimethyl pyrimidine synthesis process, which comprises: 1) mixing 2-hydroxy-4, 6-dimethyl pyrimidine, xylene and phosphorus oxychloride, heating to a temperature of 50-60 DEG C, dropwise adding N, N-diisopropylethylamine, heating to a temperature of 80-105 DEG C after the dropwise adding is completed, carrying out a reaction for 2-3 h, removing excess phosphorus oxychloride, cooling to a room temperature, and carrying out a reaction for 2-3 h to obtain a 2-chloro-4, 6-dimethyl pyrimidine intermediate; a reaction liquid crude product is obtained; and 2) dropwise adding the crude product of the reaction liquid into a supersaturated sodium bicarbonate aqueous solution at 5-15 DEG C, keeping the water temperature in the dropwise adding process, keeping the water temperature after dropwise adding, stirring for 15-35 minutes, filtering, standing and layering filtrate, drying an organic phase by anhydrous magnesium sulfate, removing xylene, and performing reduced pressure distillation to obtain the 2-chloro-4, 6-dimethyl pyrimidine. According to the method, the dosage of phosphorus oxychloride can be reduced, hydrolysis of the product is effectively avoided, the yield of the product is improved, and the method has no obvious amplification effect and is suitable for industrial production.