107results about How to "Short reaction cycle" patented technology

The invention discloses a crystalline polyaryletherketone surface grafted carbon fiber and a preparation method thereof, and belongs to the technical field of carbon materials.The preparation method comprises the following steps that an amino end-capping reagent containing sulfuryl, a difluoro monomer, a bisphenol monomer and potassium carbonate are placed in sulfolane to be subjected to a polymerization reaction, and amino-terminated polyarylether is obtained; carrying out diazonium salt reaction on the amino-terminated polyarylether and nitrite tetrafluoroborate to obtain diazonium salt-terminated polyarylether; connecting the carbon fiber with a cathode, immersing the carbon fiber in an electrolyte containing diazonium salt terminated polyarylether, and applying a reduction potential for reaction to obtain polyarylether grafted carbon fiber; and carrying out hydrolysis reaction on the carbon fiber grafted with polyarylether in an acid environment to obtain the crystalline polyaryletherketone surface grafted carbon fiber. According to the crystalline polyaryletherketone surface grafting modified carbon fiber prepared by the invention, the carbon fiber is directly connected with a polymer through high-temperature-resistant and corrosion-resistant phenyl and sulfuryl, so that the crystalline polyaryletherketone surface grafting modified carbon fiber has better high-temperature resistance and corrosion resistance.

The invention relates to the technical field of organic silicon elastomers, in particular to a multi-synergistic self-repairing polysiloxane elastomer and a preparation method thereof, and the preparation method is based on a dynamic borate bond and imine bond synergistic preparation process and a hydrogen bond and dynamic borate bond / imine bond synergistic preparation process. Compared with a single dynamic imine bond or borate bond self-repairing system, the preparation method of the multi-synergetic self-repairing polysiloxane elastomer has the advantages that the mechanical property and the self-repairing efficiency of a material are improved by utilizing a strong and weak dynamic bond synergetic system, the process for preparing the organic silicon elastomer is simple, convenient and feasible, the reaction period is short, and the cost is low. The reaction can be completed under the room temperature condition, the self-healing condition is mild, a sample can be self-repaired only under the room temperature condition, industrial production and practical application are greatly facilitated, and the method is expected to be applied to sealing materials and flexible electronic devices. The used raw materials are commercially available, so that large-scale production in industrialization is facilitated.

The invention provides a tackifying filtrate reducer, a preparation method thereof and a drilling fluid, and belongs to the technical field of synthesis of treating agents for oil field drilling fluids. The preparation method comprises the following steps: dissolving raw materials N-vinyl pyrrolidone, 2-acrylamide-2-methylpropanesulfonic acid and allyl glyceryl ether in water according to a mass ratio of (1-3): (5-7): (1-4) to prepare an aqueous solution, adjusting the pH value of the aqueous solution, adding a cross-linking agent and an initiator, and carrying out cross-linking copolymerization to obtain the tackifying filtrate reducer. The tackifying filtrate reducer for the drilling fluid can resist the temperature of 200 DEG C, has good tackifying, shearing force improving and filter loss reducing effects, can be widely applied to a high-temperature solid-free drilling fluid system and other various water-based drilling fluid systems, and has a wide application prospect.

The invention discloses a metal-free catalyst ZrC whisker as well as a preparation method and application thereof, and belongs to the technical field of ultrahigh-temperature ceramic materials. The preparation method comprises the following steps: dissolving a zirconium source and sodium fluoride in N-N, dimethylformamide to prepare a metal salt solution; adding a carbon source into the metal salt solution to obtain a spinning precursor solution; wherein the carbon source is simultaneously used as a carbon source and a spinning auxiliary agent, and the carbon source is polyacrylonitrile or polyvinylpyrrolidone; carrying out electrostatic spinning by adopting the spinning precursor solution to obtain a primary spun yarn; and carrying out high-temperature carbonization on the initial spinning yarns to obtain the ZrC crystal whiskers. As no metal catalyst is used, the ZrC whisker prepared by the method is free of impurities and high in purity, and large-scale and simple preparation of the ZrC whisker can be realized.

The invention discloses a preparation method of a carbon fiber cloth coated SixFe1-xO2 nanorod material, which comprises the following steps: dissolving a silicon source and an iron source in a mixed solution of ethanol and ethylene glycol, adding hexamethylenetetramine and urea step by step, stirring and dissolving to obtain a mixed solution, then putting the mixed solution and carbon fiber cloth into a high-pressure reaction kettle together, and stirring for 30-60 minutes to obtain the carbon fiber cloth coated SixFe1-xO2 nanorod material. The preparation method comprises the following steps: adding a carbon fiber cloth coated SixFe1-x (OH) 4 nanorod material into a reaction kettle, reacting at a certain temperature in a constant-temperature drying box, then naturally cooling to room temperature, washing and drying to obtain the carbon fiber cloth coated SixFe1-x (OH) 4 nanorod material, putting the carbon fiber cloth coated SixFe1-x (OH) 4 nanorod material into a muffle furnace, and annealing in an air environment to obtain the carbon fiber cloth coated SixFe1 The synthesis process is simple, the cost is low, the requirement for equipment is low, the controllable degree is high, and the obtained product is uniform and novel in morphology, has high charging and discharging capacity and long cycle life as a flexible negative electrode material, and has wide application in the fields of flexible batteries, photoelectric devices and the like.

The invention belongs to the technical field of biological medicine, and particularly relates to sterile cefepime hydrochloride and a direct preparation method thereof. The method comprises the following steps: firstly, carrying out condensation reaction on a 7-MPCA solution and an AE active ester solution through a solid base catalyst column at the same time; then, carrying out extraction phase separation, two times of pH regulation crystallization, activated carbon decoloration and sodium sulfite reduction on the condensation liquid to obtain a cefepime hydrochloride liquid to be crystallized; and then taking a part of the cefepime hydrochloride to-be-crystallized liquid to prepare a seed crystal mixed liquid, and adding the rest of the cefepime hydrochloride to-be-crystallized liquid and the crystallization solvent into the seed crystal mixed liquid at a specific speed to obtain the sterile cefepime hydrochloride. According to the method disclosed by the invention, the continuous production of the sterile cefepime hydrochloride is realized, the preparation period of the sterile cefepime hydrochloride is greatly shortened, side reactions and product degradation are reduced, the quality and yield of the obtained cefepime hydrochloride product are relatively high and stable, and industrial production is facilitated.

The invention belongs to the technical field of selective catalytic hydrogenation, and provides a method for preparing imine through selective hydrogenation of nitrile compounds. The method for preparing imine through selective hydrogenation of the nitrile compound comprises the following steps: fully dissolving the nitrile compound in a solvent, uniformly mixing, adding a transition metal loaded M / SiC-Bx catalyst, fully mixing to form a suspension, then transferring the suspension into a reaction kettle, sealing, purging with hydrogen, maintaining the hydrogen pressure to be 0.1-5MPa, keeping the pressure of the hydrogen to be 0.1-5MPa, and carrying out vacuum drying to obtain the imine. Under the stirring condition, the temperature of the reaction system is kept at 30-150 DEG C, the reaction is carried out for 0.5-12 hours, the imine compound can be obtained, and x is any numerical value between 0.01 and 2. After the transition metal is loaded on the B-doped SiC, the surface of the SiC becomes rich in electrons, so that the capability of activating reaction substrates (nitrile compounds) and hydrogen overflow is obviously improved, and the activity of the catalyst is further improved.

The invention discloses a FeCoNiMnRu high-entropy alloy catalyst which is prepared by the following steps: preparing a high-entropy alloy spinning film from a Fe source, a Co source, a Ni source, a Mn source and a Ru source through an electrostatic spinning method, and then preparing the FeCoNiMnRu high-entropy alloy catalyst through a two-stage calcination method, the first-stage pre-oxidation calcination of the two-stage calcination method is used for realizing the pre-oxidation of the high-entropy alloy spinning membrane, and the second-stage carbonization reduction calcination is used for realizing the carbonization of the high-entropy alloy spinning membrane and the reduction of metal. The preparation method comprises the following steps: 1, preparing a FeCoNiMnRu high-entropy alloy electrostatic spinning membrane; and 2, the FeCoNiMnRu high-entropy alloy is prepared. When the catalyst is applied to catalysis in the aspect of hydrogen production through hydrolysis of ammonia borane, the hydrogen evolution conversion frequency is 50-70 mol H2. Mol Ru <-1 >. Min <-1 >, the hydrolysis hydrogen evolution time is 110-150 s, and the activation energy Ea is 40-50 kJ. Mol <-1 >; and after 5 cycles, 40-50% of initial catalytic activity is maintained.

The utility model relates to a system for treating sludge drying flue gas based on hydrodynamic cavitation. The system comprises cyclone dust removal equipment, a centrifugal fan, spray washing equipment, hydrodynamic cavitation equipment, a gas-liquid separator and an activated carbon adsorber which are connected in sequence, one end, far away from the spraying and washing equipment, of the liquid discharging pipeline is connected with the water tank, an inlet of the filtering equipment is provided with a first pipeline connected with the water tank, an outlet of the filtering equipment is provided with a second pipeline connected with the reaction liquid storage tank, and an outlet of the reaction liquid storage tank is provided with a third pipeline; a delivery pump is arranged at one end, far away from the reaction liquid storage tank, of the third pipeline, a fourth pipeline connected with the hydrodynamic cavitation equipment is arranged at an outlet of the delivery pump, and the ozone generator is connected with the fourth pipeline through a fifth pipeline. The ozone is coupled in the hydrodynamic cavitation section, so that the mass transfer effect of the ozone can be enhanced, the oxidation effect of the ozone is further enhanced, and the effects of short reaction period, high stability, low cost and high efficiency are achieved.

The invention discloses a synthesis method of a high thickening lithium magnesium silicate, and belongs to the technical field of preparation of silicate materials. It uses sodium silicate, magnesium salt, and lithium salt as raw materials, and water as the main solvent, and reacts in a closed stirring reactor, the reaction temperature is 180-300 ° C, and carbon dioxide is introduced to control the reaction pressure at 2-6MPa. Carbon dioxide in a near-critical state acts as a secondary solvent and water to dissolve, transfer mass, and transfer heat, and reacts for 2-4 hours before separation and drying, and finally obtains lithium magnesium silicate with small particle size and low layer charge. The lithium magnesium silicate has excellent thickening ability, and its aqueous dispersion has extremely high light transmittance.

The present invention relates to a method for preparing 9,9-dioctyl-2-fluorene boric acid, industrial 2-bromofluorene, sodium tert-butoxide, n-hexane, 1-bromooctane and activating agent are added to a reaction bottle, reacted at room temperature for 1-3 hours, and then n-hexane, 1-bromooctane and activating agent are extracted in turn by vacuum distillation, and an equal amount of n-hexane solution is added again; the temperature is cooled to 40-80°C, n-butyl lithium is added, and stirred for 0.5-1 hour; trimethyl borate is added again, and stirred for 1-2 hours; after completion of the reaction, the temperature is controlled to be lower than 20-0°C, hydrochloric acid solution is dripped, reacted for 1-4 hours, and then warmed to 0-20°C for reaction for 3-6 hours; liquid separation, organic layer is washed with saturated salt water, and water layer is extracted 3 times with n-hexane; after the organic layers are mixed, the solvent is recovered by vacuum distillation; the filter cake is washed with deionized water to pH=6-7, and the finished product is obtained after drying. The present invention meets the production requirements of economic efficiency and high yield.

The invention discloses a process for continuously synthesizing m-trifluoromethyl acetophenone oxime by adopting a microchannel reactor. The process comprises the following steps: reacting m-trifluoromethyl aniline with sodium nitrite and sulfuric acid to obtain a diazonium salt solution; the method comprises the following steps: adding a copper salt catalyst, acetaldoxime, sodium acetate and water into a temperature-controlled stirring kettle as an initial circular reaction solution, and regulating the pH value of the circular reaction solution in real time by adding alkali liquor; the method comprises the following steps: quickly mixing a diazonium salt solution, an organic extraction solvent and a circular reaction solution through a micro-mixer, carrying out reaction and product in-situ extraction on the obtained mixed solution in a micro-channel reactor, and then separating through a phase splitter to obtain a water phase and an organic phase; the water phase returns to the temperature control reaction kettle for continuous recycling, and the organic phase is subjected to post-treatment to obtain the m-trifluoromethyl acetophenone oxime. The method disclosed by the invention is simple in process, continuous in operation, short in reaction period, high in safety controllability and high in production efficiency, and effectively solves the problems in the intermittent kettle type process for preparing the m-trifluoromethyl acetophenone oxime by utilizing the m-trifluoromethyl aniline at present.

This invention discloses a solid-phase thickening reactor for PETG chips, belonging to the field of polyester chip processing technology. It includes an outer cylinder with an inlet pipe and an outlet pipe installed at its top and bottom, respectively. Support legs are installed on the side of the outer cylinder. Inside the outer cylinder are a supporting cylinder and four movable inner cylinders. Connecting rings connect the supporting cylinder to the movable inner cylinders and between adjacent movable inner cylinders. This invention ensures that each chip can undergo sufficient and uniform heat exchange with the heat medium, eliminating heating "dead zones" and temperature differences in traditional equipment. Based on the synergistic effect of uniform dispersion, controllable feeding, and a three-dimensional thermal field, the raw material can undergo a thickening reaction in the reactor in an optimal state. This ensures the uniformity and thoroughness of the reaction, effectively avoiding quality problems such as chip viscosity differences and yellowing caused by uneven heating or inconsistent reaction times. Therefore, it significantly improves the final product quality, production efficiency, and batch stability of the PETG chips.

The invention relates to a process system for preparing lactide through cooperation of microwaves and ultrasonic waves, and belongs to the field of lactide material preparation. The microwave and ultrasonic synergistic technology is combined with the conventional lactide preparation technology, the microwave lactic acid dehydrator is used for removing water in lactic acid, the horizontal microwave and ultrasonic synergistic lactide preparation device decomposes the polycondensation and depolymerization reaction process into a plurality of reaction units for gradual polycondensation and depolymerization reaction, and the yield of lactide is improved. And respectively collecting the prepared lactide steam in different time periods according to temperature intervals. The process system has the advantages of continuous flow of process materials, continuous reaction, controllable process, rapid heating response, rapid and thorough dehydration, no use of a powder catalyst, no catalyst residue, timely volatilization of reactants, low vacuum degree requirement, and low energy consumption. The problems that volatilization of system products is hindered due to gradual increase of the viscosity of a reaction system, the reaction is inhibited from proceeding in the forward direction, and kettle residues are increased are solved, so that the purpose of preparing high-purity lactide at low cost is achieved.

The wastewater treatment system comprises a wastewater treatment tank mechanism, and the wastewater treatment tank mechanism comprises a main tank body base, a main tank body, an auxiliary tank base, an auxiliary tank body, a heating opening, a liquid inlet, an auxiliary tank liquid outlet, a main tank liquid inlet pipe, a liquid inlet control valve, a main tank liquid outlet, a left sealing end cover, a right sealing end cover, a heat preservation layer and a lining layer. The main tank body is fixedly arranged on the main tank body base, the auxiliary tank bodies are fixedly arranged on the main tank body through the multiple sets of auxiliary tank bases, a liquid inlet is fixedly formed in the top of each auxiliary tank body, and a heating opening is formed in the end face of one side of each auxiliary tank body. The whole tank body is optimized for anti-corrosion treatment, so that the production cost of equipment is reduced; the corrosion to the inner wall of the tank body in a wastewater preheating link is improved. The pressure control precision is improved, the oxygen inlet mode is improved, and the phenomenon that the tank body and the pipeline are blocked due to the fact that inorganic salt settles or is attached to the pipe wall due to the long reaction period is reduced.

The present invention belongs to the technical field of hydrogenation methanol catalytic materials, and particularly relates to a method for preparing a high-surface-area amorphous zirconium oxide catalytic material, which comprises the following steps: S1, adding zirconium nitrate to ethanol, ultrasonically dissolving, adding propylene oxide for a first contact reaction, and obtaining solution I; S2, subjecting solution I to a hydrothermal reaction, drying and crushing the obtained substance, and obtaining amorphous zirconium oxide; S3, adding amorphous zirconium oxide to water, ultrasonically dispersing, adding a metal salt for a second contact reaction, and obtaining solution II; S4, adding an aqueous solution of ammonium carbonate to solution II for a third contact reaction, and after the reaction is completed, centrifuging, drying, crushing, and calcining the obtained substance to obtain a product. It has the advantages of low preparation cost, simple and safe operation, short reaction cycle, and good product repeatability; the obtained amorphous zirconium oxide catalytic material with a high surface area has the advantages of low cost, high catalytic activity, and high thermal stability.

The invention discloses a preparation method of a 2-ethyl-6-methylaniline compound, which comprises the following steps: adding a supported catalyst into a reaction device, adding 1-methoxy-2-propanol and 2-methyl-6-ethylaniline as initial raw materials, and reacting at the temperature of 60-80 DEG C for 1-2 hours to obtain the 2-ethyl-6-methylaniline compound. According to the method, 1-methoxy-2-propanol and 2-methyl-6-ethylaniline are subjected to a reaction in the absence of a solvent under the action of a supported catalyst so as to generate the 2-ethyl-6-methylaniline compound. The 2-ethyl-6-methylaniline compound is one or two of 2-ethyl-N-(2-methoxyl-1-methylethylene)-6-methylaniline and 2-ethyl-N-(2-methoxyl-1-methylethyl)-6-methylaniline, and the 2-ethyl-6-methylaniline compound is one or two of 2-ethyl-N-(2-methoxyl-1-methylethyl)-6-methylaniline and 2-ethyl-N-(2-methoxyl-1-methylethyl)-6-methylaniline. The preparation method disclosed by the invention is simple in reaction process, high in product yield and adjustable in product proportion.

The application provides a high and low temperature resistant modified PBS material, a preparation method and an application. The modified PBS comprises the following raw materials in parts by weight: succinic acid: 100 parts; 1,4-butanediol: 110-130 parts; norbornene dimethylol succinic acid prepolymer: 15-30 parts; polyethylene glycol: 5-15 parts; a catalyst: 0.05-0.2 parts; an antioxidant: 0.1-0.5 parts; wherein the number average molecular weight of the norbornene dimethylol succinic acid prepolymer is 1000-2000 g / mol; and the number average molecular weight of the polyethylene glycol is 500-2000 g / mol. By introducing rigid norbornene bicyclic structure and flexible polyethylene glycol segments through chemical bonding, the high and low temperature performance of the PBS is synergistically improved, the modified PBS material can maintain stable mechanical properties in the range of-20 DEG C to 130 DEG C, meanwhile, the modified PBS material has excellent biodegradability, compatibility and processing performance, and the preparation process is simple and controllable, and is suitable for industrial large-scale production.

The invention discloses photocatalytic stereoselective E-type olefination of alkynyl amide and a preparation method of the alkynyl amide. The method is carried out in a water-phase micelle reaction system and is completed under the driving of visible light. According to the method, an alkynyl amide compound is taken as a raw material, sodium ascorbate is taken as a green reducing agent, Ru (bpy) 3 (PF6) 2 or [Ir (dtbpy) (ppy) 2] PF6 is taken as a photocatalyst in a water-phase micelle environment formed by a surfactant lauryl sodium sulfate (SDS), and under the protection of inert gas, catalytic circulation is initiated by visible light irradiation at 20-40 DEG C, so that the alkynyl amide compound is highly selectively converted into an E-type olefin product. The method is mild in condition, simple in step, high in stereoselectivity, environment-friendly and safe to operate, the problem that flammable and explosive reagents or harsh reaction conditions need to be used in a traditional method is solved, and a green and efficient preparation way is provided for preparation of the E-type acrylamide compound.

The invention provides a method for circularly producing refined glufosinate ammonium salt in an organic solvent, which comprises the following steps: mixing refined glufosinate ammonium hydrochloride with an alcohol solvent, introducing ammonia gas, and carrying out ammonification reaction to obtain refined glufosinate ammonium salt and mother liquor 1; distilling the mother liquor 1 under reduced pressure, recovering the alcohol solvent and ammonium chloride, distilling, and collecting to obtain mother liquor 2; mixing the mother liquor 2, refined glufosinate-ammonium hydrochloride and a recovered alcohol solvent, and introducing ammonia gas to carry out ammoniation reaction to obtain refined glufosinate-ammonium salt and mother liquor 3; distilling the mother liquor 3 under reduced pressure, recovering the alcohol solvent and ammonium chloride, distilling, and collecting to obtain mother liquor 4; and repeating the steps to continuously circulate to produce the refined glufosinate ammonium salt. By optimizing the reaction conditions and recycling the organic solvent, the yield of the L-glufosinate ammonium salt can be improved, the production period can be shortened to 4-6 hours, and complete recycling of the organic solvent can be realized, so that the production cost is reduced, and the economic benefit is improved.

The invention belongs to the technical field of fine chemical engineering, and particularly relates to a method and device for producing nicotinamide through continuous cyanopyridine enzyme hydrolysis. 3-cyanopyridine and a buffer solution are mixed as a raw material solution in a hydrolysis reactor, and 3-cyanopyridine is hydrolyzed under the catalytic action of hydrolase to produce nicotinamide; wherein a hydrolase supplementing system, a hydrolase transferring system and an inactivated enzyme filtering system are arranged in the hydrolysis reactor. A filter screen is arranged in an inner cavity of the hydrolysis reactor and divides the hydrolysis reaction area into an upper section and a lower section, the upper section of the hydrolysis reaction area is provided with a hydrolase supplementing system and a hydrolase transferring system, and the lower section of the hydrolysis reaction area is provided with an inactivated enzyme filtering system; fresh hydrolase enters the upper section of the hydrolysis reaction area through the hydrolase supplementing system, the hydrolase transferring system directly transfers the hydrolase with reduced activity in the upper section of the hydrolysis reaction area to the lower section of the hydrolysis reaction area, and the inactivated enzyme filtering system filters the inactivated hydrolase in the lower section of the hydrolysis reaction area and then discards the inactivated hydrolase. Therefore, the replacement of the hydrolase and the graded utilization of different enzyme activities are completed. The method provided by the invention realizes continuous production of nicotinamide through enzymatic hydrolysis of 3-cyanopyridine by a biological method, the production operation condition is stable and easy to control, the reaction period is shortened, and the problems of intermittent production, complex and difficult control of process operation conditions and reduction of enzyme activity of hydrolase caused by continuous increase of product concentration in a traditional biological method are avoided. And the quality of products is uneven.

The present invention belongs to the field of electrochemical energy storage technology, and discloses a porous sulfide bond functionalized carbon material, a preparation method and an application. The preparation method comprises: mixing sodium chloride, glucose, thiourea and water and stirring them evenly to obtain a solution A; freezing, vacuum freeze drying and grinding the solution A in sequence to obtain a precursor powder; pyrolysis carbonization treatment, washing, vacuum drying and grinding the precursor powder in sequence to obtain a porous sulfide bond functionalized carbon material. The present invention can assemble the prepared porous sulfide bond functionalized carbon material into a sodium battery as an active electrode material. The porous sulfide bond functionalized carbon material of the present invention has great application potential in safe, low-cost, high-energy and long-life (RT) Na-S batteries.

This invention relates to the field of organic compound preparation technology, specifically a method for preparing 11-triglycerides of carbonate via low-temperature acylation. This method uses glycerol and undecanoyl chloride as raw materials, employing a synergistic system of a "composite acid-binding agent + Lewis acid catalyst," and combines in-situ dehydration technology and a stepwise heating strategy in a dual-solvent environment to achieve efficient synthesis. The specific steps include: under nitrogen protection, dissolving glycerol in a dichloromethane-toluene dual solvent, adding a composite acid-binding agent of pyridine and N,N-diisopropylethylamine, anhydrous zinc chloride catalyst, and 4A molecular sieve for in-situ dehydration; dropwise adding undecanoyl chloride at a low temperature of 5-10°C, followed by sequential heating to 30°C for 2-3 hours and then reacting at 50°C for 12-16 hours; and post-processing using a combined process of filtration-multi-stage extraction-membrane separation-column chromatography. This invention provides mild reaction conditions, effectively suppresses side reactions, produces high-purity products, increases molar yield, and reduces solvent toxicity and purification costs.

The application discloses a kind of carbon black supported iron manganese composite oxide cluster catalyst's Joule heat preparation method and its application in electrocatalytic nitrate reduction preparation ammonia, belong to electrocatalytic ammonia preparation technical field.The catalyst Ketjenblack EC-600JD carbon black is used as carbon carrier, iron manganese composite oxide cluster is uniformly dispersed on the surface of carbon carrier, and the carbon carrier is worm-like mesoporous structure, with high specific surface area and high defect concentration.The application uses sodium citrate as complexing agent, acetylacetone iron and manganese acetate as metal precursor, after complexing, loading, gelation, freeze drying, the target catalyst is prepared by Joule heat instantaneous heat treatment under nitrogen atmosphere;The preparation process has high heat conversion efficiency, low energy consumption, can realize atomic dispersion of iron manganese composite oxide cluster, effectively improves the exposure degree of catalytic active site.The catalyst shows high catalytic activity, high selectivity and excellent stability in electrocatalytic nitrate reduction preparation ammonia reaction, and the ammonia preparation faraday efficiency can reach more than 85%, and the preparation process does not need noble metal and toxic reagent, and the process is green and efficient, easy to scale production, can efficiently convert nitrate wastewater into ammonia, with environmental governance and nitrogen resource recycling value.

This invention discloses a cerium-doped calcium-based photothermal catalyst supported on carbon nanotubes and its application in the preparation of biodiesel, belonging to the field of catalysis technology. The photothermal catalyst is prepared by the following method: a calcium source and a cerium source are mixed and dissolved in an aqueous ethanol solution, then multi-walled carbon nanotubes are added and stirred to load the calcium and cerium sources onto the surface of the multi-walled carbon nanotubes. The mixture is then dried to remove the solvent; calcined under nitrogen protection; and after calcination, naturally cooled to obtain the cerium-doped calcium-based photothermal catalyst supported on carbon nanotubes. This invention utilizes the strong electronic interaction between cerium and calcium to regulate the structure of active sites, inhibiting the aggregation and loss of active components, while simultaneously enhancing the catalyst's broad-spectrum light absorption and photothermal conversion capabilities, thereby achieving efficient and green biodiesel production.

The invention belongs to the technical field of bearing materials, and discloses vinyl hyperbranched polysiloxane, a polyvinyl composite material bearing and a preparation method.The preparation method of the vinyl hyperbranched polysiloxane comprises the following steps that a first siloxane monomer containing at least four vinyl groups and a second siloxane monomer containing sulfydryl are mixed, then adding a photoinitiator, uniformly mixing, and performing ultraviolet irradiation to obtain an intermediate; and slowly dropwise adding an aqueous medium into the intermediate, adding a catalyst at the same time, and then reacting at 60-90 DEG C for 4-8 hours to obtain the vinyl hyperbranched polysiloxane. According to the invention, an efficient and mild vinyl hyperbranched polysiloxane synthesis system is constructed, and the controllability and storage stability of the product structure are improved. According to the invention, high-efficiency compatibility of inorganic filler and a polyethylene matrix is realized by virtue of the synthesized vinyl hyperbranched polysiloxane, and the comprehensive performance and service reliability of the polyethylene-based composite material bearing are greatly improved.

The application discloses a preparation method of alpha-tuliketone, relates to organic synthesis technology utilization, and the preparation is that 4,8-dimethyl-3,7-nonadiene-2-ketone and triacetal are subjected to aldol condensation reaction under the action of acid-base bifunctional catalyst to generate alpha-tuliketone; the acid-base bifunctional catalyst is obtained by grafting organic base onto carboxylic acid functionalized mesoporous material.The acid-base bifunctional catalyst is simple in preparation, good in stability and reusable, is used for catalyzing the reaction of 4,8-dimethyl-3,7-nonadiene-2-ketone and triacetal, can directly generate target product alpha-tuliketone by one-pot method, is high in reaction activity, short in reaction period, simple in post-treatment, simplifies process, is high in yield, and the yield can reach more than 95%.

The present invention relates to the field of enzyme catalysis technology, in particular to an aspartate β-decarboxylase mutant, whose amino acid sequence is shown in SEQ ID NO: 3, and has higher thermal stability than wild-type aspartate β-decarboxylase. The aspartate β-decarboxylase mutant of the present invention has a more lasting activity at 45°C-60°C, which can effectively shorten the reaction cycle; the mutant has low requirements for the cooling system of the reaction, thereby reducing energy consumption and reducing costs. Moreover, it can be transported and stored at room temperature, effectively extending the shelf life. In addition, under the condition of high-temperature catalytic reaction, the growth opportunity of miscellaneous bacteria is avoided, thereby reducing the contamination of the product by bacterial metabolites, helping to increase the solubility of the substrate and improve the production efficiency per unit volume.

The application belongs to the field of enzyme engineering and biological catalysis technology, and particularly relates to a carboxylate reductase SeCAR capable of efficiently catalyzing conversion of acetic acid and ammonia water into acetamide, and a preparation method and application of the enzyme. The application discloses a carboxylate reductase SeCAR capable of catalyzing conversion of acetic acid and ammonia water into acetamide, wherein an amino acid sequence is shown as SEQ ID NO. 1, and a nucleotide sequence is shown as SEQ ID NO. 2. The application also discloses a recombinant engineering bacterium containing the carboxylate reductase SeCAR, a construction method, and a method for inducing expression of the carboxylate reductase SeCAR by the recombinant engineering bacterium. The application discloses, for the first time, the SeCAR enzyme capable of directly catalyzing conversion of acetic acid and ammonia water into acetamide, and the preparation method is simple, which fills the blank of no special enzyme for catalyzing the reaction in the prior art. The prepared SeCAR enzyme has high catalytic efficiency, short reaction period, and high acetamide yield, and meets the development trend of green chemical industry.

The present invention belongs to the technical field of emulsion preparation, and specifically relates to an ultrasound-assisted preparation of an octenylsuccinic acid cyclodextrin ester-allicin inclusion complex and its application in the preparation of a high internal phase Pickering emulsion. Under the condition of pH 8.0, octenylsuccinic anhydride is added to a β-cyclodextrin solution, and modified OS-β-CD particles are obtained after ultrasonic treatment. The obtained particles are embedded with allicin to obtain an OS-β-CD-allicin inclusion complex. The OS-β-CD-allicin inclusion complex obtained by the present invention has good emulsifying properties and antibacterial properties, and the prepared high internal phase Pickering emulsion can significantly improve the quality and shelf life of meat products.