7results 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 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.

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 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.