21results about How to "Mild reaction temperature" patented technology

The present invention relates to an electrochemical synthesis method of 2-aminothiazole compounds with the structural formula shown below: 1 =4‑Me‑, 3‑Me‑, 2‑Me‑, 4‑Et‑, 4‑MeO‑, 4‑OH‑, 4‑F‑, 4‑Cl‑, 3‑Cl‑, 2‑Cl‑.R 2 =H, Me, Et, Ph. The main process is: in a single-chamber electrolytic cell, ketone (0.589 g, 3 mmol), thiourea (0.076 g, 1 mmol), anhydrous ammonium iodide (0.145 g, 1 mmol), TsOH·H 2 O (0.951g, 5mmol), DMSO (10ml), H 2 O (5ml). Both the cathode and the anode are inserted into graphite sheets, and the current density is 5mA / cm 2 The reaction temperature was 70°C and the current was 3F / mol. The corresponding 2-aminothiazole compound 3 was obtained with a yield of 38-72%.

A preparation method and application of a pyrimidine-coated gold nanoparticle antibacterial material, the invention belongs to the technical field of antibacterial nanomaterials. The invention aims to solve the problem that the existing gold nanoparticle antibacterial material has a complicated synthesis process and cannot have an antibacterial effect on both Gram-negative bacteria and Gram-positive bacteria. Method: 1. Prepare a CMTPC solution; 2. Mix the CMTPC solution with a chloroauric acid solution, and then drop a NaOH solution; 3. Heat the reaction. The invention is used for the preparation and application of a pyrimidine-coated gold nanoparticle antibacterial material.

The invention relates to modified epoxy resin and a preparation method thereof.The preparation method comprises the steps that S1, nano aluminum nitride and mesoporous silica are subjected to an ultrasonic reaction in an organic solvent, then a reaction product is sequentially subjected to centrifugal separation, filtering, washing and drying, and a precursor AlN-coated SiO2 is obtained; s2, the precursor AlN-coated SiO2 and epoxy resin are mixed and then heated to a molten state, heat preservation is conducted in the molten state, modified epoxy resin is obtained, and the modified epoxy resin is used as a heat conduction epoxy plastic packaging material for semiconductor structure packaging. Nanometer aluminum nitride and mesoporous silica are subjected to an ultrasonic reaction to obtain a precursor AlN-coated SiO2, and the precursor AlN-coated SiO2 is doped with epoxy resin, so that the heat-conducting property of the modified epoxy resin is remarkably enhanced, the modified epoxy resin can provide an additional heat dissipation way when being applied to semiconductor structure packaging, the requirement of electronic packaging for a high-heat-conducting packaging material is met, and the service life of the high-heat-conducting packaging material is prolonged. Meanwhile, the modified epoxy resin has good thermal property and mechanical property.

The present invention belongs to the technical field of synthesis of genipin derivatives, and specifically relates to a method for preparing a 1-O-alkyl genipin derivative. The present invention mixes genipin, a low-carbon alcohol, a catalyst and a polar organic solvent for alkoxylation reaction; the catalyst is fluoroboric acid or a mixture of fluoroboric acid and boric acid or a mixture of boron trifluoride etherate and water; when the catalyst is fluoroboric acid or a mixture of fluoroboric acid and boric acid, the temperature of the alkoxylation reaction is ≥rt; when the catalyst is a mixture of boron trifluoride etherate and water, the temperature of the alkoxylation reaction is ≥0°C. The preparation method provided by the present invention can achieve 1-O-alkyl genipin derivatives with high R configuration selectivity under mild reaction temperature conditions by selecting fluoroboric acid or a mixture of fluoroboric acid and boric acid or a mixture of boron trifluoride etherate and water as a catalyst for alkoxylation reaction, and the preparation method is simple, the reaction conditions are mild, and it is more suitable for industrial production.

The invention relates to the technical field of polymer degradation, in particular to a method for preparing diesel oil by catalyzing polyethylene degradation through an aluminum oxide loaded transition metal catalyst. The method for preparing diesel oil by catalyzing polyethylene degradation with the aluminum oxide-loaded transition metal catalyst comprises the following steps: uniformly mixing polyethylene and the aluminum oxide-loaded palladium catalyst, reacting at 150-180 DEG C for 3-8 hours, and carrying out solid-liquid separation, thereby obtaining the diesel oil. According to the method for preparing the diesel oil by catalyzing the polyethylene degradation by using the aluminum oxide loaded transition metal catalyst as the catalyst, the corresponding catalyst is utilized, the reaction under high pressure is not needed, the reaction temperature is relatively mild, the implementation condition is simple, the energy is saved, and the method can be popularized in a large range. According to the method for preparing the diesel oil by catalyzing polyethylene degradation by using the aluminum oxide loaded transition metal catalyst as the catalyst, the molecular length range of components in the prepared diesel oil is relatively concentrated, impurities are fewer, and the oil product is better.

The invention provides RAFT (reversible addition-fragmentation chain transfer) polymer resin as well as a preparation method and application thereof. The preparation method comprises the following step: carrying out free radical reaction on an RAFT polymer and a monomer under the action of a free radical type initiator. According to the preparation method of the RAFT polymer resin, provided by the invention, a coupling phenomenon is avoided while a terminal thiocarbonyl group is completely removed, so that the performance of the resin is kept stable; the prepared resin is narrow in molecular weight distribution; the method has the advantages of simple steps, mild reaction temperature, short reaction time, no need of pressurization in the reaction process and low requirements on equipment.

The invention discloses benzaldehyde p-toluenesulfonyl hydrazone and a synthesis method thereof, and belongs to the technical field of organic compounds. The preparation method comprises the following steps: mixing benzaldehyde, p-toluenesulfonyl hydrazide and water, and carrying out condensation reaction to obtain benzaldehyde p-toluenesulfonyl hydrazone. According to the method, green and environment-friendly water is adopted as a solvent, the reaction temperature is mild, purification is easy, the requirement for equipment is low, the purity of the obtained benzaldehyde p-toluenesulfonyl hydrazone is larger than 99.5%, and the yield reaches up to 99.9% or above.

The invention relates to the field of high polymer chemistry, in particular to a preparation method of high-softening-point and high-epoxy-equivalent novolac epoxy resin, and novolac epoxy resin with different softening points and epoxy equivalents is obtained under different raw material proportions at different reaction temperatures and reaction time.

The invention relates to a preparation method of a baloxvir intermediate, and belongs to the technical field of medicine synthesis. The preparation method comprises the following steps: reacting a compound 02 with 2-fluorobenzaldehyde in the presence of an alkaline reagent, and carrying out post-treatment to obtain a compound 03. And carrying out cyclization reaction on the compound 03 in the presence of acid to obtain a compound 04. The preparation method provided by the invention is short in reaction time, mild in reaction, easy in reagent obtaining, safe to operate, high in product yield, high in product purity, capable of reducing the cost and beneficial to industrial implementation.

The application relates to the field of lithium ion battery electrolyte additives, in particular to a high-yield synthesis method of high-purity tris(trihydrocarbylsilyl)borate, and the synthesis steps are as follows: first, urea and hexahydrocarbyldisilazane are reacted to prepare hexahydrocarbyldisilourea; second, boric acid and the hexahydrocarbyldisilourea are reacted to obtain tris(trihydrocarbylsilyl)borate crude product; third, the crude product is purified to obtain high-purity tris(trihydrocarbylsilyl)borate. The synthesis method provided by the application has the advantages of high reaction conversion rate and yield, high product purity, recyclable filter residue and solvent after reaction, reduced waste emission and green and environment-friendly process.

The application discloses a preparation method of an enzyme-catalyzed bio-based nylon auxiliary, and belongs to the technical field of enzyme catalysis synthesis. Furan dicarboxylic acid dialkyl ester and tetramethyl piperidine amine are used as raw materials, and under the catalysis of an enzyme catalyst, the reaction is carried out in an organic solvent at a low reaction temperature. After the reaction is completed, the target product, bio-based nylon auxiliary N,N'-bis (2,2,6,6-tetramethyl-4-piperidyl) 2,5-furan dicarboxamide, is obtained by post-treatment of the reaction mixture. The method disclosed by the application does not involve high-risk and toxic reagents such as metal catalysts and alkalis. The method does not involve high-temperature conditions, the reaction temperature is 30 DEG C to 45 DEG C, the reaction temperature is mild and safe, and the requirement for equipment is low. The content of the obtained product on a gas chromatograph can reach more than 99%, and the yield can reach more than 95%.

The present application relates to solid waste resource utilization and environmental catalytic material technical field, disclose a kind of silicon carbide supported zero-valent iron type photocatalyst and its preparation method and application.The present application uses the crystal silicon recovered from waste photovoltaic panel and graphite recovered from waste lithium battery negative as raw material, under the condition without deep impurity removal purification, realizes solid phase activation and uniform mixing using mechanical chemical ball milling, and iron salt is added as iron source in the ball milling process, then low-temperature calcination is carried out to obtain silicon carbide supported zero-valent iron composite photocatalyst.The catalyst obtained by the present application has good light response and active site dispersion characteristics, and can be used for efficient degradation of metformin hydrochloride in water, and has the advantages of short preparation process, low cost, suitable for large-scale and high-value utilization of solid waste, etc.

The application discloses a zirconium-based porous metal organic framework catalyst, a preparation method and application. The catalyst is an MOF808 catalyst prepared from Zr salt and 1,3,5-benzene tricarboxylic acid in a molar ratio of 1:1. The catalyst, benzoic acid, benzylamine and a reaction solvent are placed in a reaction container, and an amine acid condensation reaction is carried out under nitrogen protection to obtain N-benzyl benzamide. The reaction temperature of the amine acid condensation reaction is 40-120 DEG C, and the reaction time is 2-24 h. The catalyst can efficiently and selectively condense benzoic acid and benzylamine to prepare N-benzyl benzamide under the condition that the reaction temperature is 90 DEG C and the solvent is tetrahydrofuran, and has the advantages of high conversion efficiency, good product selectivity, mild reaction condition, easy recycling and the like.

The invention belongs to the technical field of compounds and application thereof, and relates to a tryptanthrin compound, and a synthesis method and application thereof. The tryptophan compound is a compound a, a compound b or a compound c; the structural formula of the tryptophan compound is # imgabs0, and the tryptophan compound has an inhibiting effect on tumor cells and can be used for preparing tumor treatment drugs; synthesis is simple, reaction temperature is mild, and industrial production is easy to achieve.

The utility model relates to a reaction extraction device for producing hydroxylamine sulfate, which comprises a mixed solution feeding pipe and a sulfuric acid feeding pipe which are arranged on the outer wall of a reaction extraction tower, a crude product discharging pipe is arranged at the bottom of the reaction extraction tower, and a crude product conveying pump and a crude product refining device are sequentially arranged on the crude product discharging pipe; a stirring paddle is arranged in the reaction extraction tower and is powered by a driving motor, the outer wall of the reaction extraction tower is of a jacket structure, and a jacket layer is connected with a reboiler through a pipeline. The utility model has the beneficial effects that no extra catalyst is needed, and the production cost is low; extra reagents do not need to be introduced, the light components cyclohexanone and cyclohexane after reaction extraction are returned to the heterogeneous ammoximation device for cyclic utilization, and the technological process is simple; 0.1 MPa low-grade steam which is a byproduct of a factory is fully utilized as a heat source of the reboiler, so that comprehensive utilization of heat energy is achieved; the reaction temperature and pressure are mild, and safe and environment-friendly green production is achieved; no side reaction occurs in the reaction, and the subsequent hydroxylamine sulfate refining difficulty is reduced.

The invention provides a production process of norbornene, and belongs to the technical field of norbornene synthesizing.The production process comprises the steps that a dicyclopentadiene solution and ethylene are fed into a first radial tubular reactor to react, the reaction temperature is 200-280 DEG C, the reaction pressure is 4-10 MPa, the reaction time is 1-2 h, and the reaction time is 1-2 h; the retention time of the dicyclopentadiene solution and the ethylene is 0.1-2 hours; the materials are fed into a second radial tubular reactor for a reaction, the reaction temperature is 160-260 DEG C, the reaction pressure is 4-10 MPa, and the retention time is 0.1-1 h; carrying out gas-liquid separation and rectification separation to obtain norbornene; and the first radial tubular reactor and the second radial tubular reactor are filled with inert fillers. According to the invention, mixing and mass transfer are enhanced, the process flow time is shortened, the process severity is reduced, the reaction conditions are milder, and the operation cost is reduced.

The present application relates to the technical field of organic synthesis, and particularly relates to an environment-friendly synthesis method of 6-chloro-2-hydroxyquinolin. The specific scheme is that p-chloro-o-nitroacetacetanilide is closed under the action of a certain concentration of liquid alkali, electrolytic reduction is used instead of traditional reductant reduction to prepare a sodium salt, and the sodium salt is subjected to acidification treatment to obtain a pyridyl-quinoline intermediate (6-chloro-2-hydroxyquinolin). The method greatly reduces the discharge of sulfur-containing wastewater, has mild reaction conditions, short reaction period, protects the environment, and reduces the cost of synthesizing the pyridyl-quinoline intermediate (6-chloro-2-hydroxyquinolin).

The preparation method comprises the following steps: S1, adding an alcohol copolymer, acid anhydride and a solvent into a reaction container, stirring and reacting under a heating condition to obtain a modified alcohol copolymer, cooling, adding the solvent and chloroplatinic acid again, stirring at 50-100 DEG C for 2-10 hours, and cooling to obtain the modified alcohol copolymer; performing reduced pressure distillation to remove the solvent to obtain a catalyst; s2, adding allyl glycidyl ether, methanol, a catalyst and a co-catalyst into a reaction container, uniformly stirring, starting to heat, dropwise adding trimethoxyhydrosilane when the temperature reaches 48-52 DEG C, and reacting for a period of time after dropwise adding to obtain a crude product; and S3, transferring the crude product into distillation equipment, firstly carrying out atmospheric distillation to separate out a solvent methanol, then carrying out reduced pressure distillation to separate out front and rear fractions, and finally obtaining the product gamma-glycidoxypropyltrimethoxysilane. The preparation method provided by the invention has the advantages of lower cost, higher yield and the like.

The invention relates to the technical field of solid waste resource utilization and environmental catalytic materials, and discloses a silicon carbide loaded zero-valent iron type photocatalyst as well as a preparation method and application thereof. Crystalline silicon recycled from waste photovoltaic panels and graphite recycled from negative electrodes of waste lithium batteries are used as raw materials, solid-phase activation and uniform mixing are achieved through mechanochemical ball milling under the condition that deep impurity removal and purification are not conducted, and ferric salt is added in the ball milling process to serve as an iron source; and calcining at low temperature to obtain the silicon carbide loaded zero-valent iron composite photocatalyst. The obtained catalyst has good photoresponse and active site dispersion characteristics, can be used for efficient degradation of metformin hydrochloride in a water body, and has the advantages of being short in preparation process, low in cost, suitable for large-scale and high-value utilization of solid waste and the like.

The present invention belongs to the field of fluorine chemical industry, and specifically relates to a fluorinated liquid and a preparation method thereof. The preparation method comprises the following steps: using hexafluoropropylene oxide oligomers and hexafluoropropylene as starting materials and placing them in a solvent, reacting under the catalysis of a catalyst to obtain a perfluoropolyether fluorinated liquid; the reaction formula is shown in formula (I): wherein n is a 2-4 integer. The present application has a mild reaction temperature, a fast reaction speed, a high reaction yield, a safe process, and almost no three wastes are produced, so that the amplification of the product is easy to achieve.

This invention provides 13 High-abundance CO was prepared by CuO catalytic oxidation. 13 This invention relates to a CO2 apparatus and method, belonging to the field of stable isotope-labeled compound preparation technology. The apparatus described in this invention is an integrated unit comprising a feed gas supply unit, a fixed-bed reaction unit, a cryogenic collection unit, a partial pressure purification unit, and a tail gas treatment unit connected in series. The fixed-bed reaction unit includes a fixed-bed reactor, a heater, and a temperature sensor. This invention utilizes high-temperature calcined modified CuO catalyst particles, combined with a composite bed structure design of "quartz wool-quartz sand-catalyst-quartz sand," significantly improving conversion efficiency and selectivity; optimizing the purification process, achieving product quality that meets high-end application standards; featuring a novel apparatus design with greatly improved sealing and stability; simple and controllable operation, facilitating industrial scale-up; and being green, safe, and environmentally friendly, aligning with industrial development trends.