42 results about "Trimethyl borate" patented technology

The invention relates to the field of filter materials, and discloses a denitration catalyst-loaded filter bag and a preparation method thereof, the filter bag comprises interface modifier impregnated modified polytetrafluoroethylene fiber and a catalytic additive loaded on the modified polytetrafluoroethylene fiber, the interface modifier is prepared by carrying out hydrolysis-polycondensation on ethyl orthosilicate, perfluorooctyl ethyl trimethoxy silane, trimethyl borate and 3-(2, 3-epoxypropoxy) propyl trimethoxy silane, and the interface modifier is prepared by carrying out hydrolysis-polycondensation on ethyl orthosilicate, perfluorooctyl ethyl trimethoxy silane, trimethyl borate and 3-(2, 3-epoxypropoxy) propyl trimethoxy silane; the catalytic additive is prepared by using polyether PluronicF127, 1, 3, 5-trimethylbenzene and dopamine as raw materials through emulsion-induced interface assembly and externally introducing mesoporous silica to prepare a hollow spherical catalyst carrier, then loading cerium and manganese precursors onto the surface of the hollow spherical catalyst carrier, and coating with a titanium dioxide shell layer. The filter bag prepared by the invention has good denitration activity, sulfur resistance, water resistance, hydrophobicity and friction resistance.

The invention relates to a synthetic method of p-chlorophenylboronic acid, which belongs to the technical field of organic synthesis, and comprises the following steps: S1, synthesis of p-chlorophenylboronic acid: adding magnesium chips and anhydrous tetrahydrofuran into a reaction container, adding p-bromochlorobenzene in batches while stirring, automatically initiating a reaction liquid, heating and blackening, stopping adding p-bromochlorobenzene, and cooling to room temperature to obtain p-chlorophenylboronic acid; adding p-bromochlorobenzene when the temperature is reduced to 60 DEG C, repeating the operation, adding p-bromochlorobenzene until all p-bromochlorobenzene is added, carrying out cold bath when the temperature is reduced to 40 DEG C, adding trimethyl borate at 10-15 DEG C, and continuing stirring when the reaction system becomes viscous; and S2, purification of p-chlorophenylboronic acid: adding a hydrochloric acid aqueous solution, stirring, standing to separate out organic phases, extracting a water layer with ethyl acetate, combining the organic phases, drying with anhydrous sodium sulfate, filtering, reducing pressure to remove the solvent to obtain white solids, and drying overnight to obtain gray solids, namely p-chlorophenylboronic acid. The method is simple in process step, safe and environmentally friendly, and the chromatographic purity of the prepared p-chlorophenylboronic acid can reach 99.0% or above.

The invention discloses a refrigerator material, a preparation method thereof and a refrigerator, and belongs to the technical field of refrigerator materials. Comprising the following steps: mixing polystyrene granules and a covalent organic framework adsorbing sufficient nitrogen, and extruding to obtain the refrigerator material, the covalent organic framework capable of adsorbing sufficient nitrogen is obtained by the following method: sequentially and slowly adding ZnCl2 and an alkali metal solution as counter ion donors into a mixed solution of 2, 3, 6, 7, 10, 11-hexahydroxy triphenylene and trimethyl borate, uniformly dispersing, transferring into a coaxial tubular open type plasma reactor, and reacting for 2-4 hours to obtain the covalent organic framework capable of adsorbing sufficient nitrogen. Preparing a covalent organic framework under a DBD plasma condition; and heating and vacuumizing the covalent organic framework, adding nitrogen, and cooling to obtain the covalent organic framework adsorbing sufficient nitrogen. The material is applied to the aspect of refrigerator materials, solves the technical problem that existing materials do not meet the requirements of refrigerators on low peculiar smell, high strength and antibacterial property, and has the characteristics of low peculiar smell, high strength and antibacterial property.

The invention discloses a synthesis method of high-purity triethyl silane, and belongs to the technical field of organosilicon compound synthesis. The method solves the problems of low purity, poor stability and serious pollution of the existing synthesis method, sodium hydride and trimethyl borate are used as starting raw materials, a trimethoxy sodium borohydride solution is generated in situ under a low-temperature condition, then the trimethoxy sodium borohydride solution and accurately metered triethyl chlorosilane are subjected to a mild and controllable reduction reaction, and the high-purity triethyl chlorosilane is obtained. According to the method, the dependence of a traditional process on a noble metal catalyst or a highly toxic reducing agent is abandoned, the reaction safety is improved from the source, the complete reaction is promoted by adopting the composite catalyst, and the hydrophobic modified 3A molecular sieve is innovatively utilized for low-temperature adsorption purification, so that key impurities such as trace moisture and chloride ions can be efficiently removed; and finally, high-vacuum precise rectification is combined, so that a high-purity triethyl silane product can be obtained.

The invention discloses a preparation method of lithium difluoro (oxalato) borate. Lithium hydroxide, trimethyl borate, dimethyl oxalate and anhydrous ammonium bifluoride steam are used as raw materials to react in an ionic liquid medium. The method adopts a plasma activation technology, can be efficiently carried out in a low-temperature environment without traditional heating, not only shortens the reaction period, but also can inhibit fluorine source decomposition, oxalate hydrolysis and other side reactions, improves the selectivity of a target product, and uses the ionic liquid as a reaction medium, and the high polarity and low volatility of the ionic liquid can ensure the uniform dispersion of raw materials. Meanwhile, supercritical carbon dioxide extraction replaces traditional recrystallization, one-step purification is achieved by means of the selective dissolution characteristic of supercritical carbon dioxide extraction, the process steps are simplified, and solvent residues are reduced.

The application provides a lithium ion electrolyte additive, a lithium ion electrolyte and a preparation method thereof, a lithium battery and an electrical equipment, and relates to the field of lithium batteries. The lithium ion electrolyte additive is 5-trifluoromethylpyridine-2-lithium trimethylborate. The preparation method comprises the following steps: mixing 2-hydroxy-5-trifluoromethylpyridine, lithium bis(trimethylsilyl)amide and a first organic solvent, and stirring and reacting to obtain 5-trifluoromethylpyridine-2-lithium hydroxide; and dropping trimethyl borate into a second organic solvent containing 5-trifluoromethylpyridine-2-lithium hydroxide, and reacting to obtain 5-trifluoromethylpyridine-2-lithium trimethylborate. The additive has a low oxidation potential, can form an effective CEI film before LNMO deintercalates lithium ions, thereby inhibiting the decomposition of the electrolyte in the subsequent reaction, reducing the generation of harmful substances HF, and further protecting the structure of the material.

The invention relates to the technical field of diamond functional structures and preparation, and discloses a preparation method and application of an oxygen-terminated hydrophobic nano-strip diamond film, and the preparation method comprises the following steps: step 1, grinding a silicon, molybdenum or titanium substrate with nano-diamond powder for 15-30 minutes, and placing the substrate in nano-diamond turbid liquid for ultrasonic treatment for 30 minutes; and 2, taking out the substrate slice, placing the substrate slice in a reaction chamber of a chemical vapor deposition (CVD) device, and taking hydrogen, methane and hydrogen carrying trimethyl borate as raw materials. According to the preparation method of the oxygen terminal hydrophobic nano-strip diamond film, coating films such as a copper film and a gold film are not needed, and the oxygen terminal hydrophobic diamond film can be obtained only by etching a non-diamond phase under the condition that diamond and non-diamond coexist; the oxygen terminal hydrophobic diamond film is used as a hydrophobic electrode of an electrochemical sensor, is applied to electrochemical detection of an endocrine disrupter-nonyl phenol, and has the advantages of lower cost, very good sensitivity and wide application prospect.

The invention discloses a lithium battery polymer protective coating as well as a preparation method and application thereof, and belongs to the technical field of lithium batteries, the preparation method of the coating comprises the following steps: adding a macromolecular fluorine-containing polymer, boric acid ester-containing branched polyether and a lithiated mesoporous molecular sieve into a solvent, and stirring and dispersing to obtain a coating; coating the coating on the surface of a metal lithium negative electrode, and performing vacuum drying to form a lithium battery polymer protective coating; the boric acid ester-containing branched polyether is obtained by sequentially reacting hyperbranched polyglycidyl with long-chain alkyl succinic anhydride and trimethyl borate; according to the invention, a high-efficiency and stable lithium battery negative electrode protection system is constructed by introducing functional groups such as long-chain alkyl, carbonyl, borate group and the like on the structure of hyperbranched polyglycerol and utilizing the characteristics of the branched structure and the lithiated mesoporous molecular sieve. The system can effectively inhibit the growth of lithium dendrites, improve the safety of the battery and prolong the cycle life of the battery.

The invention discloses a high-performance boron nitride nano ceramic and a preparation method thereof, and relates to the technical field of ceramics. The preparation method comprises the following steps: S1, mixing trimethyl borate, urea and ethanol according to a molar ratio of 1: (1.2-1.5): (5-8) to obtain a mixed solution, then adding nano carbon powder, and carrying out a stirring reaction to obtain transparent boron nitride precursor sol; s2, freeze-drying the boron nitride precursor sol to obtain fluffy boron nitride precursor powder; s3, heating the boron nitride precursor powder to 800-1000 DEG C in an ammonia gas atmosphere, and keeping the temperature for 2-3 hours to obtain boron nitride nano-powder; and S4, carrying out spark plasma sintering on the boron nitride nano powder to obtain the high-performance boron nitride nano ceramic. The aluminum nitride ceramic with the grain size of 20-50nm, high density and thermal conductivity and excellent comprehensive performance is obtained through multi-step synergistic interaction and precise control of process parameters.

The embodiment of the invention relates to the technical field of chemical devices, in particular to an esterification device and a system for manufacturing boric acid. The esterification device comprises an esterification container, a heating piece and a stirring assembly, the esterification container forms an esterification chamber and a liquid inlet, a feed port and a discharge port which are communicated with the esterification container, the liquid inlet is used for introducing a boron trifluoride-methanol complex into the esterification chamber, the feed port is used for introducing a solid defluorination agent into the esterification chamber, and the discharge port is used for discharging the boron trifluoride-methanol complex into the esterification chamber; the boron trifluoride-methanol complex and the solid defluorinating agent are subjected to an esterification reaction in the esterification chamber to generate trimethyl borate and a solid by-product; the heating piece is arranged to heat the esterification chamber and keep the temperature in the esterification chamber stable; the stirring assembly is used for stirring the materials in the esterification chamber, so that the materials are uniformly mixed. According to the esterification device, the temperature in the esterification chamber is kept constant through the heating piece, the reaction process is accelerated through the stirring assembly, and the esterification reaction rate and the material conversion rate can be increased.

In a method of producing metal borohydride, M(BH4)n, from metal metaborate, M(BO2)n, in which M is a metal, such as a metallic metal, an alkali metal, an alkaline earth metal, a transition metal or a chemical compound behaving as a metal, and n is a valence value of the metal, metal borohydride is formed through a reaction of metal hydride, MHn, with trimethyl borate, B(OMe)3, and metal trimethyl borate is formed through a reaction of boric acid, H3BO3, with methanol, MeOH, under removal of water, H2O. An electrochemical cell is used for the conversion of metal metaborate and water, H2O, to boric acid, in the electrochemical cell. The electrochemical cell has an anodic half-cell and a cathodic half-cell separated by a cation exchange membrane, and a solvent and water is provided to both the anodic half-cell and the cathodic half-cell. Metal metaborate is provided to the anodic half-cell, where acid ions, H+, and electrons, e−, are generated at the anode from electrolysis of water, and H reacts with metal metaborate and water. The cation exchange membrane passes metal ions, Mn+, from the anodic half-cell to the cathodic half-cell, and metal hydroxide, M(OH)n, is formed in the cathodic half-cell.

The present invention relates to a kind of preparation method of 9 anthracene boronic acid, belong to the field of chemical synthesis technology.The preparation method of 9 anthracene boronic acid that the present invention is provided, using refined anthracene, diboric acid as raw material, under the effect of catalyst, ligand and oxidant, by one-step C H boration reaction prepares 9 anthracene boronic acid.In prior art, the preparation of 9 anthracene boronic acid mainly often first uses refined anthracene as raw material to synthesize 9 bromoanthracene (Path B) through bromination reaction, then using 9 bromoanthracene, n-butyllithium and trimethyl borate etc. as raw material, at 78 DEG C, low temperature lithiation boration reaction prepares 9 anthracene boronic acid (Path A), reaction process is complicated, condition is harsh;And the present invention solves the above problem from the root, directly using cheap refined anthracene, diboric acid as raw material, one-step C H boration reaction obtains product 9 anthracene boronic acid, compared with prior art, reactions steps is short, without intermediate product, also saves the steps such as intermediate product purification, purification, more simple and efficient.

The invention provides a wide-temperature-range electrolyte and a preparation method thereof, a battery and electric equipment. Relates to the technical field of lithium batteries. The preparation method comprises the following steps: mixing fluoroethylene carbonate, perfluorohexanoic acid and diethyl tetrafluoroborate for reaction to obtain a functional solution; trimethyl borate and sulfuric acid are used for carrying out surface modification treatment on carbon nanofibers to form a B-CNF material; and embedding the B-CNF material into the hydrogen bond dynamic network of the functional solution to obtain the wide-temperature-range electrolyte. According to the preparation method, by constructing a hydrogen bond dynamic network and embedding the modified B-CNF material, the balance of low viscosity at low temperature and high stability at high temperature is realized, meanwhile, the ion conduction performance is improved, the performance of the battery in a wide temperature range is remarkably enhanced, and the high-temperature adaptability requirement is met.

The invention provides a preparation method of a mixed nitride composite material special-shaped antenna window, which belongs to the technical field of composite materials, and comprises the steps of mixed weaving, washing, pretreatment, vapor deposition, dipping curing, cracking, rough machining, finish machining and finished product obtaining. The pretreatment comprises the following steps: mixing silicon tetrachloride with absolute ethyl alcohol, stirring, adding triton X-100 and trimethyl borate, and uniformly stirring to obtain a pretreatment solution; immersing the washed antenna window prefabricated part into the pretreatment liquid, placing the washed antenna window prefabricated part into a supercritical reaction kettle, introducing carbon dioxide, heating to 38-42 DEG C, controlling the pressure to 9-12MPa, stirring for 1.5-2.5 hours, taking out, standing and drying, and keeping the temperature at 570-590 DEG C for 1.8-2.5 hours and keeping the temperature at 880-910 DEG C for 2.7-3.2 hours in an air atmosphere to obtain an initial antenna window; the prepared antenna window is high in strength, excellent in high temperature resistance and good in ablation resistance.

The invention relates to the technical field of helicene compound synthesis processes, in particular to red-light nitrogen-thia-bis (9-helicene) and a synthesis method and application thereof.The red-light nitrogen-thia-bis (9-helicene) is characterized in that benzothiophene-2-boric acid is used as a raw material, 2-bromo-4-(tert-butyl)-1-iodobenzene, a catalyst and anhydrous potassium carbonate are added, and a compound 2 is obtained through heating reaction; taking the compound 2 as a raw material, adding n-butyllithium for reaction, and then adding trimethyl borate to obtain a compound 3; taking the compound 3 as a raw material, adding 1-bromo-3, 6-diiodocarbazole, a catalyst and anhydrous potassium carbonate, and carrying out heating reaction to obtain a compound 4; taking the compound 4 as a raw material, and adding an anhydrous ferric trichloride solution dissolved by nitromethane to obtain a compound 5; the preparation method comprises the following steps: taking a compound 5 as a raw material, adding sodium tert-butoxide, a catalyst and a phosphine ligand, carrying out a heating reaction to obtain a compound 6, i.e., red-light aza-bis (9-helicene), and embedding an anti-aromaticity module into a bis-helicene system to finally obtain the aza-bis (9-helicene) compound with exocarpium citri grandis fluorescence emission.

The invention provides a preparation method of a boron nitride fiber reinforced ceramic-based composite material, and belongs to the technical field of boron nitride fiber reinforced ceramic-based composite materials. The preparation method comprises the steps of mixed slurry preparation, fiber cloth pretreatment, coating curing and sintering. The step of preparing the mixed slurry comprises the steps of preparing silicon-boron-oxygen-nitrogen powder, coating and pulping; the preparation method of the silicon-boron-oxygen-nitrogen powder comprises the following steps: mixing tetraethoxysilane and absolute ethyl alcohol, uniformly stirring, dropwise adding trimethyl borate at a dropwise adding rate of 1-2 mL / min while maintaining a stirring speed of 480-520 r / min, adjusting the pH value to 3-4 after dropwise adding, adding hexamethyldisilazane, stirring at 40-50 DEG C for 2-3 h to obtain sol, standing, aging, drying and roasting to obtain the silicon-boron-oxygen-nitrogen powder. The silicon-boron-oxygen-nitrogen powder is obtained; the composite material prepared through the method is high in mechanical property, good in high temperature resistance and excellent in long-term service performance.

This invention relates to the field of trimethyl borate processing technology, specifically to a distillation and dehydration apparatus and method for the preparation of trimethyl borate. The dehydration apparatus includes a support plate, a distillation tank, and a dehydration chamber. A gas guide box connects the distillation tank and the dehydration chamber, and a condensing plate is installed on the inner wall of the gas guide box. Inside the dehydration chamber, there is a collection chamber and a dehydration chamber connected to the original liquid chamber. During the liquid storage stage, a pushing mechanism is installed inside the dehydration chamber, and a reciprocating mechanism is installed below the pushing mechanism. The static pressure from the increased liquid level in the original liquid chamber drives the pushing plate downwards. The downward movement of the pushing plate forces the two peeling plates to separate relative to each other. The peeling plates then peel off the upper layer of solution and transfer it to the collection chamber, achieving initial peeling. Simultaneously, the support plate presses air into the air cushion and forces the air cushion to expand, raising the liquid level of the upper layer of solution in the dehydration chamber and placing it on the peeling path of the peeling plates, thereby improving the peeling effect of the upper layer of solution and reducing waste.

The invention relates to the technical field of high polymer material preparation, in particular to high-temperature-resistant cyanate ester resin for a carbon fiber composite core and a preparation method of the high-temperature-resistant cyanate ester resin. The high-temperature-resistant cyanate resin for the carbon fiber composite core is prepared from the following raw materials in parts by weight: 45 to 60 parts of bisphenol A dicyanate, 25 to 35 parts of bisphenol E dicyanate, 4 to 8 parts of nano aluminum nitride, 8 to 10 parts of modified polyether-ether-ketone microspheres, 5 to 10 parts of tri (4-cyanophenyl) borate and 2 to 5 parts of molybdenum disulfide nanosheets. The tri (4-cyanophenyl) borate is prepared from the following raw materials: trimethyl borate, p-hydroxybenzonitrile and potassium carbonate; according to the modified polyether-ether-ketone microspheres, chitosan and gamma-methacryloxy propyl trimethoxy silane are adopted as a modifying agent. The carbon fiber composite core prepared from the high-temperature-resistant cyanate ester resin prepared by the invention has excellent high-temperature resistance and aging resistance.

The invention provides a method and equipment for separating and removing trimethyl borate from methanol waste liquid, and relates to the technical field of methanol solvent recovery. The separation method comprises the following steps: (1) mixing the methanol waste liquid with a basic catalyst to form a mixed liquid; the basic catalyst is selected from at least one of sodium methoxide, lithium methoxide and sodium hydroxide; and (2) transferring the mixed solution into a methanol rectifying tower, continuously separating the mixed solution in the methanol rectifying tower, collecting methanol at the tower top, and enabling tower bottoms to flow out from the tower bottom. The number of theoretical plates of the methanol rectifying tower is 50-76, the reflux ratio of the tower top is (2-4): 1, the operating temperature of the tower top is 67-68 DEG C, and the operating temperature of a tower kettle is 70-80 DEG C. According to the method, the content of trimethyl borate in methanol is reduced to be below 10 ppm, the method is simple and high in feasibility, the treated methanol can be completely applied to an original reaction or any other application, the production cost is reduced, and the method is environmentally friendly.

The present invention discloses a method for preparing methylboronic acid d3. The method comprises reacting methyl iodide d3 with magnesium shavings to produce methylmagnesium iodide d3, which is then reacted with trimethyl borate to produce dimethyl methylborate. The product is then quenched with acid for hydrolysis and purified to obtain methylboronic acid d3. The product prepared by the present invention has high purity, high yield, and high degree of deuteration.

The title of the invention is boron-containing adhesion promoter compositions and methods thereof. The adhesion promoter composition includes a substance that can include BH x and a solvent. Embodiments of the adhesion promoter composition can include methods of providing a substrate with a stable surface modification. The adhesion promoter composition can include a surfactant, such as an anionic surfactant, a cationic surfactant, or a non-ionic surfactant, such as polyethylene glycol p-(l,l,3,3-tetramethylbutyl)-phenyl ether, crown ether, polysorbate, or combinations thereof. The adhesion promoter composition can include an activator, such as ferric chloride, trimethyl borate, titanium tetrachloride, or combinations thereof. The substance that includes BH x may include ammonia borane, dimethylamine borane, trimethylamine borane, triethylamine borane, dicyclohexylamine borane, ethylenediamine bisborane, t-butylamine borane, diphenylphosphine borane, pyridine borane, borohydride, or combinations thereof.

The invention discloses a safe silicon-carbon negative electrode lithium ion battery and a preparation method thereof, and belongs to the technical field of lithium ion batteries. The lithium ion battery comprises a positive plate, a negative plate, a diaphragm, electrolyte and a shell, the positive plate comprises a positive current collector, a prime coating and a positive active coating; the prime coating comprises ceramic powder, a single-walled carbon nanotube and a binder; the negative plate comprises a negative current collector and a negative active coating; the diaphragm comprises a base membrane and a ceramic coating coated on the surface of the base membrane, wherein oil coatings composed of aramid fibers, PVDF and an organic solvent are coated on the two surfaces of the ceramic coating; the electrolyte comprises a lithium salt, an organic solvent and a flame retardant additive composed of trimethyl phosphate, trimethyl borate and chloroethylene carbonate. According to the lithium ion battery disclosed by the invention, the puncture resistance and the safety can be greatly improved under the condition that the performance of the battery is kept unchanged, the qualified rate of a needling test is high, and the daily use high-safety requirement of the battery with a wearable silicon-carbon negative electrode within 2Ah can be met.

The invention relates to a continuous production process of trimethyl borate, which comprises the following steps: 1) mixing methanol and boric acid according to the molar ratio of (4.0-4.5): 1, feeding into a pre-reactor, and dissolving and pre-reacting at 64-66 DEG C; (2) continuously feeding the pre-reacted material into the middle upper part of an esterification rectifying tower, continuously carrying out esterification reaction and rectifying separation, controlling the tower top temperature at 53-55 DEG C, and extracting an azeotrope of trimethyl borate and methanol; (3) conveying a methanol-water mixed solution discharged from the bottom of the esterification rectifying tower to a methanol recovery tower, controlling the temperature of the tower top at 62-64 DEG C, directly introducing the extracted gas-phase methanol into the middle part or the lower part of the esterification rectifying tower, and discharging the total amount lt of boric acid / trimethyl borate from the tower bottom; and 0.5% of water. Compared with the prior art, the energy consumption can be saved by more than 50% under the condition of ensuring that the one-time conversion rate of boric acid is greater than or equal to 99.6%, the diameter and the height of the esterification rectifying tower are greatly reduced under the same productivity, and the equipment cost is reduced.

The invention discloses an inorganic zinc-rich primer coating composition, a coating as well as a preparation method and application of the inorganic zinc-rich primer coating composition. The inorganic zinc-rich primer coating composition comprises a first component and a second component, the first component comprises zinc powder and basalt fibers, and the second component comprises ethyl polysilicate, polyvinyl butyral, ethanol, water, hydrochloric acid, a specified solvent and trimethyl borate. According to the inorganic zinc-rich primer coating composition provided by the invention, the basalt fiber and the polyvinyl butyral are introduced to modify a traditional inorganic zinc-rich coating, so that the compactness, the corrosion resistance, the thermal conductivity and the irradiation resistance of a coating are remarkably improved, the coating is free of cracking under the dry film thickness of 150 microns, the salt spray resistance exceeds 3500 hours, and the coating has a good application prospect. And the protective paint can effectively pass LOCA (loss of coolant accident) superposition test, shows excellent decontamination performance and radiation stability, and completely meets the technical requirements of national and No.1 nuclear power plants on the protective paint.

The invention belongs to the field of trimethyl borate production, and particularly relates to a method for producing high-purity trimethyl borate by using a five-tower series connection process and integrating reactive distillation, pressure swing distillation and thermal coupling distillation technologies, which comprises a reactive distillation tower, a methanol recovery tower, an azeotrope distillation tower, a pressurized distillation tower and a trimethyl ester refining tower. The reaction rectifying tower completes the reaction of boric acid and methanol and realizes the preliminary separation of a product, the methanol recovery tower and the azeotrope rectifying tower recover methanol to realize cyclic utilization, the pressurized rectifying tower obtains a trimethyl borate crude product, and the refining tower obtains a high-purity trimethyl borate product. According to the invention, a third component does not need to be added, heat integration is realized through heating medium circulation, refining modes are flexibly switched to adapt to impurity fluctuation, and green and low-carbon continuous production can be realized.

This invention discloses a method for preparing a slow-release lithium iron phosphate cathode material, belonging to the technical field of lithium iron phosphate cathode material preparation. The method includes the following steps: S1. Introducing a doped carbon source into a lithium silicate precursor for CVD carbon coating to obtain a carbon-coated lithium replenishing agent; the doped carbon source is a carbon source and a dopant source; the carbon source is at least one of methane, acetylene, ethylene, and propylene; the dopant source is at least one of trimethyl borate, triethyl borate, triisopropyl borate, and trimethylcycloborane; S2. Sintering the lithium iron phosphate precursor slurry and the carbon-coated lithium replenishing agent to obtain a slow-release lithium iron phosphate cathode material. This invention forms a uniform carbon layer on the surface of lithium silicate using a gas-phase carbon source to obtain a slow-release lithium replenishing agent; then, it is blended with the lithium iron phosphate precursor slurry and sintered to obtain a cathode material with both high capacity and long cycle life. This cathode material exhibits excellent battery capacity and excellent cycle life, and its battery capacity is not easily decayed.

The utility model discloses a trimethyl borate salting-out treatment device which comprises a device box body, supporting legs are arranged on the two sides of the bottom of the device box body, a stirring motor is installed in the middle of the top of the device box body, a salting-out chamber is arranged in the device box body, and a stirring shaft is arranged in the middle of the interior of the salting-out chamber. An output shaft of the stirring motor penetrates through the top of the device box body and is connected with a coupler, the top of the stirring shaft penetrates through the top of the salting-out chamber and is connected with the lower end of the coupler, a discharging opening is formed in the bottom of the salting-out chamber, a feeding opening is formed in the upper left end of the salting-out chamber, and a filter screen is arranged in the feeding opening. According to the utility model, the feeding hole is formed in the left upper end of the salting-out chamber, and the filter screen is arranged in the feeding hole, so that raw material particles and liquid for preparing trimethyl borate are filtered to remove impurities through the filter screen, and the purity of the trimethyl borate obtained after salting-out treatment is improved.

The present invention relates to the technical field of polymer material preparation, and in particular to a high-temperature resistant cyanate resin for a carbon fiber composite core and a preparation method thereof. The high-temperature resistant cyanate resin for the carbon fiber composite core, in parts by weight, comprises the following raw materials: 45 to 60 parts of bisphenol A dicyanate, 25 to 35 parts of bisphenol E dicyanate, 4 to 8 parts of nano-aluminum nitride, 8 to 10 parts of modified polyetheretherketone microspheres, 5 to 10 parts of tris(4-cyanophenyl) borate, and 2 to 5 parts of molybdenum disulfide nanosheets; the tris(4-cyanophenyl) borate is made from the following raw materials: trimethyl borate, p-hydroxybenzonitrile, and potassium carbonate; the modified polyetheretherketone microspheres use chitosan and γ-methacryloxypropyltrimethoxysilane as modifiers. The carbon fiber composite core made of the high-temperature resistant cyanate resin prepared by the present invention has excellent high-temperature resistance and aging resistance.

The invention discloses a biomass-based hard carbon material with a closed-pore structure optimized by a boron-based template agent, a preparation method of the biomass-based hard carbon material and application of the biomass-based hard carbon material in a sodium-ion battery. The preparation method comprises the following steps: (1) carrying out solid-liquid mixing on biomass and an aqueous solution of a boron template agent, and drying; the selected boron template agent comprises at least one of boric acid, borax, triethyl borate, trimethyl borate, metaboric acid, sodium metaborate and potassium borate. And (2) carbonizing the dried mixed material twice, naturally cooling, pickling, and removing the template to leave a rich pore structure. And performing high-temperature re-carbonization on the carbon material, cooling, and sequentially performing crushing, acid pickling, water washing and drying. The obtained biomass-based hard carbon material has a pore structure with a large specific surface area and closed pore volume, the defect density of a graphite structure is reduced to slow down sodium death caused by an SEI film, and more pore-filled sodium storage sites are provided, so that the first coulombic efficiency and sodium storage performance of a battery are improved.

The invention relates to the technical field of trimethyl borate processing, in particular to a rectification dehydration device and method for trimethyl borate preparation. The dehydration device comprises a supporting plate, a distillation retort and a dehydration box, a gas guide box is communicated between the distillation retort and the dehydration box, a condensation plate is arranged on the inner wall of the gas guide box, and a liquid collection bin and a dehydration bin communicated with the stock solution bin are further arranged in the dehydration box; in the liquid storage stage, a pushing mechanism is arranged in the dewatering bin, and a reciprocating mechanism is arranged below the pushing mechanism. Static pressure generated when the liquid level in a stock solution bin rises serves as power to drive a pushing plate to move downwards, the pushing plate moves downwards to force stripping plates on the two sides to move relatively to be separated, the stripping plates strip an upper-layer solution and transfer the upper-layer solution into a liquid collecting bin, preliminary stripping is achieved, meanwhile, a bearing plate presses air into an air cushion, and the air cushion is forced to expand; the liquid level of the upper-layer solution in the dewatering bin rises and appears on the stripping path of the stripping plate, so that the stripping effect on the upper-layer solution is improved, and waste is reduced.