1104results about How to "Increase reaction rate" patented technology

The invention relates to a catalyst for ethylene oxide ring-opening polymerization and a preparation method thereof, and belongs to the technical field of high polymer material synthesis, and the catalyst is a composite structure based on a silicon dioxide nanoparticle loaded bimetal organic complex; a modified nitrogen-containing polydentate ligand is prepared by adopting a special method, is coordinated with metal ions through covalent bonds and is loaded on silicon dioxide nanoparticles; by utilizing the high dispersity and stability of the silicon dioxide nanoparticles and the synergistic catalytic effect of the bimetal organic complex, the catalytic effect is effectively improved, the polymerization process is accelerated, the polymerization stability is enhanced, the polymerization molecular weight is improved, and the distribution is narrow.

The invention provides a low-warpage underfill adhesive for FC-BGA packaging, a preparation method thereof and a flip chip. The underfill adhesive comprises the following components in percentage by mass: 50%-60% of silicon dioxide, 24%-29% of epoxy resin, 16%-20% of a curing agent, 0.1%-0.2% of carbon black and 0.1%-0.2% of an accelerant. Wherein the epoxy resin is composed of high-purity bisphenol A epoxy resin, polyurethane modified epoxy resin and phenolic aldehyde modified epoxy resin. By adjusting the proportion of the high-purity bisphenol A epoxy resin, the polyurethane modified epoxy resin and the phenolic aldehyde modified epoxy resin and combining the curing agent and the accelerant, the stress of the underfill adhesive is integrally reduced, and the underfill adhesive with good fluidity and low warpage is obtained; therefore, the packaging yield and the packaging efficiency of chip packaging are improved.

The invention discloses a synthesis method of vitamin C ethyl ether, and belongs to the technical field of vitamin derivative synthesis. The synthesis method comprises the following steps: adding vitamin C, benzaldehyde and a catalyst into a first organic solvent, carrying out an aldolization reaction, adding an organic alkali after the aldolization reaction is finished, carrying out a neutralization reaction, adding an alkylation reagent, carrying out an alkylation reaction, and removing the first organic solvent after the alkylation reaction is finished, so as to obtain the vitamin C benzaldehyde. The preparation method comprises the following steps: adding a first organic solvent into a first organic solvent, pulping, filtering, collecting filter residues, washing and drying to obtain 5, 6-O-benzyl-3-O-ethyl-L-ascorbic acid, carrying out hydrogenation deprotection on the 5, 6-O-benzyl-3-O-ethyl-L-ascorbic acid, filtering after hydrogenation deprotection, collecting filtrate, crystallizing, collecting precipitate, washing and drying to obtain the 5, 6-O-benzyl-3-O-ethyl-L-ascorbic acid. The vitamin C ethyl ether is obtained. The synthesis method provided by the invention is simple to operate and high in production efficiency, and the obtained vitamin C ethyl ether is high in yield and purity.

The invention provides a preparation method and an application method of a gasified slag-based carbon-zeolite composite material, and belongs to the technical field of carbon-zeolite composite materials. The preparation method comprises the following steps: taking gasified slag as a raw material, mixing the gasified slag with alkali, a silicon source substance, a surfactant and water, and sequentially carrying out aging treatment and hydrothermal reaction to obtain the gasified slag-based carbon-zeolite composite material. The gasified slag-based carbon-zeolite composite functional material is prepared from the gasified slag, the process is simple, the preparation cost is low, meanwhile, high-added-value utilization of the gasified slag is achieved, the purpose of treating waste with waste is achieved, and economic benefits and environmental protection benefits are achieved. The gasified slag-based carbon-zeolite composite functional material prepared by the invention has a good removal effect on low-concentration ammonia nitrogen and organic matter wastewater, has regeneration performance, and still has good ammonia nitrogen adsorption and organic pollutant degradation performance after regeneration.

The invention relates to an organic wastewater photocatalytic rotational flow enhanced hydrogen production method and device, and provides an organic wastewater photocatalytic rotational flow enhanced hydrogen production method, which comprises the following steps: (A) shear oscillation mixing of a catalyst and wastewater, (B) wastewater rotational flow oscillation photocatalytic hydrogen production, and (C) gas-liquid-solid three-phase separation and catalyst reuse. The invention further provides an organic wastewater photocatalytic rotational flow enhanced hydrogen production device. Organic matter pollutants in water are decomposed under the action of the catalyst, chemical energy of the organic matter pollutants is recycled in the form of hydrogen, cooperation of wastewater photocatalytic hydrogen production and wastewater treatment is achieved, the reaction rate of wastewater photocatalytic hydrogen production is increased, and secondary pollution caused by the reaction catalyst is avoided.

The invention discloses degradable tough epoxy resin with a cation-pi effect and a preparation method of the degradable tough epoxy resin. The epoxy resin is composed of multi-arm mercaptan containing ester groups, ionic liquid containing unsaturated double bonds and with the cation-pi effect and epoxy resin. According to the present invention, the multi-arm mercaptan containing the ester group, the unsaturated double bond ionic liquid and the epoxy resin can be combined through the light-heat dual curing process to construct the high toughness degradable epoxy resin system, and the whole method is green, simple and easy to operate. The energy dissipation capacity of the epoxy resin containing the cation-pi action is remarkably improved when the epoxy resin is stimulated by the outside, and cation-pi action sites uniformly dispersed in a network play a key role in the balance of rigidity and toughness under repeated loading-unloading circulation. Besides, ester groups in the structure enable the synthesized epoxy resin to have excellent degradation performance, hydrogen atoms in imidazole and the ester groups can form intermolecular hydrogen bonds, the degradation process of the resin is accelerated, and rapid degradation under the amine / alkaline condition is achieved.

The invention provides a process for preparing cyclohexane-1, 2-dioctyl phthalate, which adopts a loop reaction process to perform hydrogenation reaction of dioctyl phthalate, and comprises the following steps: under the condition of excessive hydrogen atmosphere, firstly putting a catalyst, a solvent and a target product into a reaction tank to form a circulating material; when reaction liquid passes through the Venturi ejector, hydrogenation reaction can be carried out, the Venturi reactor can provide a high gas-liquid mixing ratio, the reaction rate is high, and the production efficiency is high. The catalyst and the reaction mixed liquid are separated by combining a membrane separation process, so that the catalyst is recycled, and the cost is reduced. The target product is added into the system to maintain material balance in the system, so that stable production is ensured. Compared with the traditional technical process, the method has the advantages that the reaction time is shortened, the energy consumption of the device and the investment cost are reduced, the high conversion rate of reactants and the high selectivity of target products can be kept, the operation period of the device is long, and continuous and stable production is realized.

The invention belongs to the technical field of electrochemistry, and particularly relates to a gas diffusion electrode for efficiently producing hydrogen peroxide in situ and a preparation method thereof. The gas diffusion electrode is composed of a carbon paper substrate, a carbon black gas diffusion layer and a carbon nitride modified carbon nanotube catalyst layer. The preparation method of the gas diffusion cathode comprises the following steps: mixing a carbon nanotube, g-C3N4, isopropanol, 60wt% of PTFE emulsion and water to prepare a mixed solution, and loading a compound of the carbon nanotube and g-C3N4 on one side of a carbon paper substrate by adopting an ultrasonic impregnation mode to prepare a catalyst layer; the other side of the carbon paper substrate is impregnated with carbon black and PTFE emulsion to prepare a diffusion layer, and the diffusion layer is uniformly coated, dried and annealed to prepare the gas diffusion cathode. The gas diffusion electrode is used for efficiently producing hydrogen peroxide through in-situ electrocatalysis, the yield of hydrogen peroxide can reach 1050 mg / L after 1.5 h, the current efficiency is 76%, and the energy consumption is 5.56 KWh / Kg.

The invention discloses a non-natural amino acid as well as a preparation method and application thereof. The novel non-natural amino acid is obtained by introducing long and soft side chain amino acid into a classical ASF side chain for the first time, the stability of the obtained non-natural amino acid is enhanced, the reaction radius of the non-natural amino acid is increased, the non-natural amino acid can touch amino acid residues with farther distance, and the reactivity is improved. In addition, compared with other covalent amino acids, the covalent amino acids have higher reaction rate and binding efficiency. The polypeptide and related drugs obtained based on the non-natural amino acid can be high in safety, can cross a blood brain barrier to realize brain targeting, and have better anti-tumor activity, so that the polypeptide and related drugs have extremely high medical value.

The utility model discloses an MVR (mechanical vapor recompression) concentrated solution treatment device, which belongs to the field of wastewater treatment and comprises a first coagulating sedimentation device, a second persulfate advanced oxidation device, a second persulfate adding device for adding persulfate into the second persulfate adding device, a third biochemical treatment device, a fourth membrane treatment component and a fifth clear water tank. Wherein the MVR concentrated solution to be treated can be fed into the first coagulating sedimentation device. The first coagulating agent adding device is connected with the first coagulating sedimentation device, and the first coagulating agent adding device is used for adding a coagulating agent into the first coagulating sedimentation device, so that the MVR concentrated solution is flocculated and settled, and first coagulated sludge and first coagulated supernate are respectively obtained. The method can be suitable for MVR concentrated solution treatment scenes with different scales and treatment requirements, the wastewater treatment efficiency is improved, the treatment cost is reduced, efficient and stable treatment of wastewater can be achieved, and the method has high application value and wide popularization and application value.

The invention relates to the field of enzyme preparations, and discloses an enzyme preparation for catalytic degradation of bioplastics and a preparation method thereof, the enzyme preparation for catalytic degradation of bioplastics comprises the following components by weight: 25-50 parts of an enzyme, 1-8 parts of a catalytic additive, 2-10 parts of a stable dispersant, and 30-50 parts of a buffer solution; the catalytic additive is prepared by using calcium bentonite as a carrier to load nano titanium dioxide; the stabilizing dispersant is prepared by introducing polyethylene glycol monoallyl ether into a sodium lignin sulfonate structure by utilizing an initiator through an aqueous solution polymerization method, and by adding the catalytic additive and the stabilizing dispersant, the enzyme preparation is endowed with good degradation efficiency on bio-based plastics and the stability of an enzyme preparation system is improved.

The invention relates to the technical field of seawater desalination, in particular to a seawater desalination reverse osmosis membrane, a preparation method and application. The seawater desalination reverse osmosis membrane is prepared by the preparation method. The preparation method comprises the following steps: immersing the prepared support layer into a water phase solution, and then taking out the support layer adsorbing the water phase solution; immersing the support layer adsorbing the water phase solution into a first oil phase solution, and forming a primary reverse osmosis membrane through a first interfacial polymerization reaction; then, taking out the primary reverse osmosis membrane, and carrying out first drying treatment under a steam condition; and immersing the primary reverse osmosis membrane into a second oil phase solution, and carrying out a second interfacial polymerization reaction to form the seawater desalination reverse osmosis membrane. The application refers to the application of the reverse osmosis membrane for seawater desalination in the aspects of reclaimed water reuse, seawater desalination and brackish water desalination. According to the invention, the seawater desalination reverse osmosis membrane which simultaneously meets high desalination rate and high water flux can be prepared.

The invention discloses a method for controlling ion concentration and volume balance in an electrolyte by using nickel hydroxide. The method comprises the following steps: preparing a reaction base solution containing a first complexing agent and a first alkali; the first anolyte, a second complexing agent solution and a second alkali solution are simultaneously added to the bottom of the reaction base solution for stirring reaction, solid-liquid separation is performed after nickel hydroxide reaches the target particle size, and filtrate and a filter cake are obtained; washing the filter cake, and slurrying the filter cake by using a second anolyte to obtain a nickel hydroxide slurrying material; and adjusting the sodium ion concentration, pH and nickel ion concentration of the third anolyte by adopting a sodium hydroxide solution, a nickel hydroxide slurrying material and a nickel sulfate solution to obtain the catholyte. According to the invention, a feeding mode of feeding at the bottom is adopted, and a complexing agent is matched, so that crystals can stably grow and are convenient to filter; in the preparation process, aging and too high pH conditions are not needed, operation is simpler, labor intensity is small, the reaction rate is higher, and continuous treatment of the anolyte can be achieved.

A feeding system for potassium sulfate production relates to the technical field of raw material feeding equipment and comprises a horizontally-arranged supporting base, a vertically-arranged reaction kettle body and a supporting bracket are fixedly arranged at the top of the supporting base, two vertically-arranged raw material tanks are fixedly inserted into the top of the supporting bracket, and a built-in mixing assembly is arranged on the upper inner wall of the reaction kettle body. Quantitative material taking assemblies are arranged on the lower inner walls of the raw material tanks, the built-in mixing assembly is communicated with the two quantitative material taking assemblies through a communication assembly, a transmission rod which is rotationally arranged is coaxially arranged at the inner bottom of the reaction kettle body, and a plurality of stirring blades are uniformly distributed on the outer wall of the transmission rod in the circumferential direction; an exhaust pipe communicated with the inner cavity of the reaction kettle body is fixedly arranged at a position, below the built-in mixing assembly, of the outer wall of the reaction kettle body. The problem that an existing feeding mode for producing potassium sulfate is poor in raw material feeding continuity is solved; the adjustability of the feeding ratio of the raw materials is poor. And the distribution uniformity of the fed raw materials is poor.

The utility model relates to the technical field of organic solid waste resource utilization, and discloses an anaerobic digestion device for high-yield methane, which comprises an anaerobic reactor, a feed port and a discharge port are respectively arranged at the lower end and the upper end of the side wall of the anaerobic reactor, and an exhaust port is arranged at the top of the anaerobic reactor. A plurality of layers of electrodes which are horizontally arranged are arranged at the upper end in the anaerobic reactor, the electrodes are silk screen filler electrodes, the electrodes comprise positive electrodes and negative electrodes, and the positive electrodes and the negative electrodes are connected with an external power supply through wires. The water electrolysis device is arranged in the anaerobic reactor, the positive electrode generates oxygen, a micro-oxygen-consumption environment is generated around the positive electrode, hydrolytic bacteria are promoted to convert organic matter into low-molecular organic acid, a substrate is provided for methanogens, and methane generation is promoted; the negative electrode produces hydrogen, a hydrogen environment is generated around the negative electrode, hydrogen nutrition type methanogens are promoted to convert hydrogen and CO2 dissolved in the system into methane, and the purposes of reducing the carbon dioxide and improving the methane yield are achieved.

The utility model relates to the technical field of iron phosphate production, and discloses iron solution reaction equipment for iron phosphate production, the iron solution reaction equipment comprises a reaction kettle body, a liquid inlet and a liquid outlet, the liquid inlet and the liquid outlet are respectively communicated with the top and the bottom of the reaction kettle body, a stirring mechanism is arranged in the reaction kettle body, and a heating mechanism is arranged on the outer side of the reaction kettle body. The stirring mechanism comprises a driving motor, a connecting rod, a stirring plate, a supporting ring and a filter screen. According to the iron solution reaction equipment for iron phosphate production, when an iron salt solution and a phosphate solution react in the reaction kettle body, the connecting rod drives the stirring plate to rotate to stir the iron salt solution and the phosphate solution, so that the iron salt and phosphate are mixed more thoroughly, and the iron phosphate production rate is increased; meanwhile, ferric phosphate precipitated to the bottom of the reaction kettle body is shielded and filtered by the filter screen, so that the ferric phosphate is not easy to float upwards to influence the reaction of ferric salt and phosphate solution, and the reaction rate of ferric salt and phosphate solution is further improved.

The invention discloses a pulse discharge eddy current cavitation generator which comprises an eddy current container, and the eddy current container is provided with a liquid inlet pipe allowing liquid to be guided in tangentially. An inlet of the liquid outlet pipe is communicated with the center of the vortex container, and the liquid outlet pipe is provided with an inner diameter decreasing section, a throat part and an inner diameter increasing section which are sequentially arranged from bottom to top; the flow guide part is arranged in the center of the vortex container and is positioned on the lower side of the liquid outlet pipe; from bottom to top, the outer diameter of the flow guide piece is gradually reduced; the flow guide part and the liquid outlet pipe are coaxially arranged; a first electrode is arranged in the liquid outlet pipe, and a second electrode opposite to the first electrode is arranged in the flow guide part; the liquid outlet pipe is provided with an electrode holder for fixing the first electrode; and the liquid outlet pipe body is provided with a liquid outlet. The vortex hydrodynamic cavitation generator and the nanosecond pulse device are combined in the same device, so that the energy consumption of the device is reduced, the discharge efficiency and the organic matter degradation efficiency are improved, and the space is saved.

The invention discloses a method for preparing tetrakis hydroxymethyl phosphonium sulfate by using high-concentration hydride, and belongs to the technical field of preparation of tetrakis hydroxymethyl phosphonium sulfate. The method for preparing tetrakis hydroxymethyl phosphonium sulfate by using the high-concentration hydride comprises the following steps: step 1, adding concentrated sulfuric acid and formaldehyde into a reaction kettle, uniformly stirring and mixing, then adding an organic catalyst and a modified surfactant, and continuously stirring to completely and uniformly mix reactants to obtain a mixed solution; 2, hydride is introduced into a reaction kettle through a pipeline and reacts with the mixed solution, a heating reaction is conducted, after the reaction is finished, the pipeline is closed, and a reaction solution is obtained; and 3, carrying out vacuum concentration treatment on the reaction liquid, and recrystallizing to obtain tetrakis hydroxymethyl phosphonium sulfate. The tetrakis hydroxymethyl phosphonium sulfate prepared by the method has excellent yield and purity.

The invention relates to an air pollution control purification tower, and belongs to the technical field of air pollution control, the air pollution control purification tower comprises a purification tower main body and a tower cover fixedly mounted at the top of the purification tower main body, a purification barrel is fixedly mounted in the purification tower main body, and an air outlet pipe extending to the outside of the tower cover is fixedly mounted in the tower cover; a first cleaning mechanism which extends into the purification barrel and is used for cleaning the inner wall of the purification barrel is arranged on one side of the purification tower main body. According to the air pollution control purification tower, the controller controls an axial flow fan to start to work to drive a flow guide pipe to rotate, meanwhile, the controller controls a booster pump to start to work to convey a purification barrel in a liquid storage tank into the flow guide pipe through a connecting pipe and a hose, and then spraying is conducted through spraying holes, so that the purification reaction is promoted, and the purification effect is improved. The reaction rate of the purification barrel is effectively increased, the overall purification effect of the purification barrel is effectively improved, and the advantages of high purification speed and good purification effect are achieved.

The invention provides a method for removing sulfur ions in water by coupling a piezoelectric catalytic fuel cell with oxygen oxidation, and belongs to the technical field of wastewater treatment. The method is characterized in that a Fe-coated MoS2 / CFC piezoelectric catalytic electrode is prepared by a one-step hydrothermal method, and a piezoelectric catalytic fuel cell enhanced air oxidation system is constructed based on the electrode. The method has the advantages that 91% (-14.7 mg) of sulfur ions (S < 2->) can be removed within 1.5 h by utilizing the piezoelectric catalytic fuel cell and only aerating, and the system has excellent piezoelectric catalytic activity, has the characteristics of high efficiency and greenness in sulfur ion removal, and has a good application prospect in the fields of catalytic fuel cells and advanced oxidation treatment of wastewater.

The invention discloses a method and a device for preparing an oxygen-free copper pipe from regenerated copper, a corrosion-resistant copper pipe and a casting process, and belongs to the field of copper treatment, and the corrosion-resistant copper pipe has the oxygen element content of less than 5 ppm, the hydrogen element content of less than 0.3 ppm, the phosphorus element content of 0.1-0.3% and the balance of copper element; the method for preparing the oxygen-free copper pipe through the regenerated copper comprises the steps that S1, molten copper in a shaft furnace is heated to the set temperature, the concentration of reducing gas in the shaft furnace is adjusted, the oxygen element content of the molten copper in the shaft furnace is increased to be larger than 30 ppm, and primary impurity removal is conducted; s2, the molten copper in the shaft furnace is sequentially introduced into a chute, a refining furnace, a standing furnace and a casting furnace, the temperature of the molten copper in the chute, the refining furnace, the standing furnace and the casting furnace is gradually decreased, inert gas and reducing gas are introduced into the chute, the refining furnace, the standing furnace and the casting furnace, and the flow and pressure of the inert gas and reducing gas introduced into the chute, the refining furnace, the standing furnace and the casting furnace are gradually decreased; and performing secondary impurity removal. The method is mainly used for preparing the oxygen-free copper pipe through the regenerated copper and preparing the corrosion-resistant copper pipe.

The invention relates to the technical field of gas-solid phase catalytic reaction equipment, and discloses a gas-solid phase catalytic reactor, which comprises a reactor body and a plurality of catalyst bed layers arranged in the inner cavity of the reactor body, the plurality of catalyst bed layers are arranged at intervals along the flowing direction of reaction raw materials, the discharge side of each catalyst bed layer is provided with a quenching filler layer, and the discharge side of each catalyst bed layer is provided with a quenching filler layer. The quenching filler layer is arranged to be capable of quenching flames generated by the reaction raw materials; according to the invention, through a plurality of catalyst bed layers arranged at intervals, the intensity of gas-solid phase catalytic reaction is directly reduced, so that combustion explosion of combustible gas in reaction raw materials caused by release of excessive heat is avoided; the quenching filler layer is used for quenching flames possibly generated by reaction raw materials, so that combustible gas and oxygen can be subjected to a gas-solid phase catalytic reaction within the explosion limit, the reaction rate is increased, the reaction efficiency is improved, the economic benefits are further improved, and the device has the advantages of being safe and reliable.

The invention discloses a metal oxide-doped negative electrode material and a preparation method and application thereof. The preparation method comprises the following steps: mixing a porous carbon raw material and a solution containing metal salt, filtering, and carrying out heat treatment to obtain the porous carbon composite material containing the metal oxide. According to the invention, the oxide does not conflict with the positive electrode material of the battery, and the metal oxide is successfully doped in the porous carbon, so that the overall conductivity of the porous carbon material can be improved, and the transmission efficiency of electrons can be enhanced; in addition, the high-temperature resistance of the electrode material can be enhanced, so that the electrode material can better bear the volume change of silicon particles and is more suitable for application scenes in an extreme environment, and the cycle life of the battery is prolonged. The invention provides a preparation method and application of porous carbon doped with transition metal oxide, and aims to overcome the defects of the existing porous carbon matrix and realize preparation and application of a silicon-carbon negative electrode material which is more stable in structure, resistant to high temperature and more excellent in electrochemical performance.

The invention discloses a pyrenyl Schiff base fluorescent derivative, a fluorescent probe, a preparation method of the pyrenyl Schiff base fluorescent derivative and application of the pyrenyl Schiff base fluorescent probe in biological imaging, and belongs to the technical field of fluorescent probes. The pyrenyl Schiff base fluorescent probe capable of specifically detecting the zinc ions is prepared through two-step chemical reaction of Suzuki coupling reaction and aldehyde amine condensation reaction, and the pyrenyl Schiff base fluorescent probe has good recoverability and low cytotoxicity, is high in practicability and low in cost, and can be applied to detection of the zinc ions. In addition, the sensor has excellent ion selectivity to zinc ions, extremely high sensitivity, good Stokes displacement and visual sensing performance, and detection of exogenous zinc ions and endogenous zinc ions in cells and tissues is realized through biological imaging. The problems of difficult synthesis process, slow response speed, high detection cost, non-ideal biological imaging effect and the like of the conventional fluorescent derivative are solved.

The invention discloses a preparation method of a carbon dot nano-enzyme, which comprises the following steps: dissolving oxalic acid, polyethyleneimine and ferric nitrate in ultrapure water, heating, mixing and reacting, cooling to room temperature, centrifuging, filtering, dialyzing, and taking supernate to obtain the carbon dot nano-enzyme. The prepared oxalic acid carbon dot nano-enzyme is matched with acetylcholin esterase, acetylcholine, 3, 3 ', 5, 5'-tetramethyl benzidine and H2O2 to construct a colorimetric and fluorescent dual-mode detection method for glyphosate in fruits and vegetables. The oxalic acid carbon dot nano-enzyme is prepared by doping ferric nitrate and tetraethylenepentamine into oxalic acid serving as a precursor, the oxalic acid carbon dot nano-enzyme has excellent peroxidase-like activity, a colorimetric and fluorescent dual-mode detection method of glyphosate is constructed through the oxalic acid carbon dot nano-enzyme, dual-mode detection results can be mutually verified, and the detection result is accurate. And the accuracy and the reliability of a detection result are remarkably improved.

The invention discloses a preparation method of a high-entropy phosphide nanotube, which successfully prepares a nanotube phosphide with a high-entropy structure by adopting a hydrogen bond organic framework (HOF)-metal organic framework (MOF) template conversion method. In the preparation process of the material, a core-shell structure (HOF (MOF)) is firstly formed, the core gradually disappears through a diffusion mechanism, and finally, the material is converted into a hollow nanotube structure which is uniform and controllable in size. According to the hollow structure, the specific surface area is remarkably increased, more active sites are provided, the transmission path of reactant molecules is optimized, and the electro-catalytic performance is greatly improved. Besides, the overall tubular morphology of the material is uniform, the size is controllable, and compared with a traditional granular material, the specific surface area is remarkably increased, so that more reaction sites are exposed in the external environment, and the catalytic efficiency and the reaction rate of the material in an electro-catalytic reaction are greatly improved.

The invention discloses high-purity oxamide with concentrated particle size and spherical morphology, a preparation method of the high-purity oxamide and application of the high-purity oxamide in preparation of a slow-release fertilizer, and belongs to the technical field of oxamide synthesis and application. The method comprises the following steps: mixing an ammonia-alcohol solution and an alcohol ester solution, conveying the mixed solution into a series tubular reactor for reaction, and then conveying the mixed solution into a parallel tubular reactor for reaction after pressure stabilization and flow equalization to obtain a reaction solution containing oxamide; performing flash evaporation on the reaction liquid to obtain flash evaporation liquid and flash evaporation gas, and performing solid-liquid separation on the flash evaporation liquid to obtain solid oxamide and filtrate; and drying the solid oxamide to obtain the oxamide. The method realizes high conversion rate and high purity, and the product has ultrafine particle size distribution. The purity of the prepared oxamide is greater than or equal to 99%, the D50 particle size is concentrated to 50 + / -15 microns, the spherical morphology is uniform, the release is stable, and the oxamide has a very good effect in preparation of long-acting slow-release fertilizers and combustion inhibitors and research on the nitrogen utilization rate.

The invention discloses an electrochemical-catalyst dual-activated reactor for efficiently degrading azo dye by persulfate, which comprises: a reactor main body comprising a pretreatment chamber, a main reaction chamber and a post-treatment chamber which are mounted from bottom to top; the electrochemical unit comprises an anode, a cathode and a direct-current stabilized power supply, and the two ends of the direct-current stabilized power supply are electrochemically connected with the anode and the cathode; the catalyst unit is mounted at the bottom of the main reaction chamber; the liquid conveying system is used for sequentially conveying wastewater and a persulfate solution to the pretreatment chamber, the main reaction chamber and the post-treatment chamber, and the wastewater and the persulfate solution circularly flow in the chambers to finish pretreatment, degradation treatment and post-treatment; and the gas spraying system is used for uniformly inputting gas into the main reaction chamber. The reactor combines a dual activation mechanism of electrochemistry and a catalyst, generates active species with strong oxidizing property, remarkably improves the degradation effect of azo dyes, and has the advantages of high efficiency, simplicity and convenience in operation, wide applicability and the like.

The invention discloses a preparation method of 1alpha-hydroxyl dinorhydrin, the structural formula of the 1alpha-hydroxyl dinorhydrin is shown as a formula (1), the method comprises the following steps: by taking dinorhydrin shown as a formula (2) as a raw material, preparing the 1alpha-hydroxyl dinorhydrin through five steps of acylation, bromination, debromination, epoxidation / hydrolysis and ring opening, and the reaction formula is as follows: # imgabs0 #. All reactions are carried out under normal pressure, reagents with high toxicity are not used in the reaction process, the reaction yield is high, the total yield of the five-step reaction can reach 48.46%, and the method is suitable for industrial production.

The invention discloses a semi-coke tail gas chemical looping hydrogen production system which is characterized in that a first gas inlet chamber and a second gas inlet chamber are arranged in the hydrogen production system, and a reaction tube comprises a first reaction chamber and a second reaction chamber; the gas inlet of the first reaction chamber is communicated with the gas inlet of the second reaction chamber; the air outlet of the first reaction chamber is communicated with the air outlet of the second reaction chamber, so that the first reaction chamber and the second reaction chamber can supply air independently, the air speed in the first air inlet chamber is higher than that in the second reaction chamber, internal airflow circulation is effectively formed in the internal circulating fluidized bed, the reaction process is more sufficient, and the reaction efficiency is improved. The device effectively improves the hydrogen production efficiency, is simple in structure, realizes the independent air supply process through the independent design of the two cavities of the gas inlet pipe and the reaction pipe, realizes the effective circular reaction of tail gas in the reaction pipe through the control of the air speed, and improves the conversion efficiency.