453 results about "Continuous reaction" patented technology

The invention discloses polyether-ether-ketone resin with adjustable molecular weight distribution as well as a synthesis method and application of the polyether-ether-ketone resin. The synthesis method comprises the following steps: preparing polyether-ether-ketone resin in the presence of carbonate and / or bicarbonate of alkali metal; wherein the carbonate and / or bicarbonate of the alkali metal comprises sodium carbonate and potassium carbonate, and the sodium carbonate has gradient particle size distribution. According to the invention, sodium carbonate with specific particle size distribution is used to regulate and control the reaction rate to be stable and continuous, so that the molecular weight distribution of the polymer presents a narrower distribution form. Therefore, the molecular structure is uniform, the molecular form is uniform, the physical and chemical properties, including mechanical strength, thermal stability and chemical stability, of the material can be improved, and particularly, the thermal stability of the material is improved most remarkably.

The invention relates to the technical field of organic synthesis, and discloses a preparation process of (S)-3-aminobutyronitrile hydrochloride, which comprises the following steps: by taking a compound S1 as an initial raw material, sequentially implementing chlorination, amino protection, cyano substitution and deprotection reaction through four-step continuous reaction (M01 preparation, M02 preparation, M03 preparation and M04 preparation), and finally obtaining the high-purity (S)-3-aminobutyronitrile hydrochloride. The preparation process disclosed by the invention is simple and convenient to operate, mild in reaction condition, stable in yield of each step, high in safety and suitable for industrial large-scale production, and can be used for carrying out standard treatment on the cyanide-containing wastewater, and has a relatively good application prospect.

The invention provides a dynamic cross-linked polyolefin elastomer and a preparation method thereof. According to the method, a double-kettle serial solution polymerization process is adopted, a reaction material is generated through a polymerization reaction in a first reaction kettle, the reaction material is transferred into a second reaction kettle added with a dynamic cross-linking agent and an initiator for continuous reaction and then enters a devolatilization system, a quenching agent is added through a static mixer, then granulation is performed through a screw extruder, and the dynamic cross-linked polyolefin elastomer is obtained. According to the preparation method, dynamic chemical crosslinking is carried out in the production process of the polyolefin elastomer, and the mechanical property and thermal stability of the obtained polyolefin elastomer product can be improved on the premise of ensuring the processability.

The invention discloses a low-temperature connecting method for glass and a C / C composite material, and relates to a connecting method for the glass and the C / C composite material. The problems that the performance of a base material is reduced and interface bonding is poor due to the fact that the connection temperature of an existing C / C composite material and glass is too high are solved. According to the method, firstly, a metal modified layer is prepared on the surface of the C / C composite material through magnetron sputtering, a carbide reaction layer is generated at the interface of the composite material, then connection of the C / C composite material and microcrystalline glass is achieved at the temperature of 580-660 DEG C through Bi2O3-B2O3-ZnO glass brazing filler metal, a microstructure mainly comprising a glass phase is formed in a welding seam, and the welding seam is formed. A continuous reaction layer is generated at the interface of the glass brazing filler metal and a glass base material, the glass brazing filler metal and the C / C composite material are connected through direct combination of oxides on the surface of a metal modified layer, and formed welding seams are compact and free of defects such as air holes and cracks. And the shear strength of the obtained joint can reach 13MPa.

The invention discloses a carbide slag fly ash concrete aerated block and a preparation method thereof, and belongs to the technical field of resource utilization of building materials and solid waste. The aerated block comprises the following raw materials: carbide slag, fly ash, gypsum, Portland cement, aluminum powder paste, a nano core-shell structure calcium-aluminum-silicon polymer and a zwitterionic foam-stabilizing polymer, the raw materials have a specific weight part range. Wherein the nano core-shell structure calcium-aluminum-silicon polymer is prepared by dispersing fly ash in water to form slurry, reacting the slurry with sodium silicate and a sodium metaaluminate solution in sequence, then adding calcium nitrate and a zinc sulfate solution for continuous reaction, and carrying out separation, washing, drying and grinding; the zwitterionic foam-stabilizing polymer is prepared by polymerizing a monomer in a solvent, precipitating and separating out, quaternizing, activating carboxyl crosslinking, dialyzing and purifying, and freeze-drying. All the steps relate to process parameters such as dry mixing time, stirring time, curing temperature, pressure and time, and the performance of the aerated block is improved through component optimization and preparation process improvement.

The wastewater treatment system comprises a water inlet unit, a reactor, a separation unit and a circulation unit which are sequentially connected to form a closed-loop system, the water inlet unit is further connected with a chemical dosing unit, the water inlet unit is used for conveying wastewater to the reactor, and the chemical dosing unit is used for adding alkali into the wastewater to adjust the pH value and providing required magnesium ions; a fluidization reaction zone and a separation zone are arranged in the reactor, and the fluidization reaction zone promotes generation and growth of struvite particles through particle collision and aggregation; the separation zone enables generated particles to partially fall back to the fluidization reaction zone for continuous reaction through preliminary solid-liquid separation; the separation unit is used for receiving the wastewater in the separation area, further removing residual particles, and enabling the small particles to flow back to the reactor through the circulation unit for recycling. By optimizing the particle generation, separation and backflow processes in wastewater treatment, the formation of target large particles is promoted, the resource recycling is facilitated, meanwhile, the consumption of chemical agents is reduced, and the cost is reduced.

The invention provides a continuous process for preparing aromatic hydrocarbon by supercritical carbon dioxide hydrogenation, which comprises the following steps: 1) adding a reaction liquid containing a solvent and a catalyst into a reaction kettle, spraying supercritical carbon dioxide and hydrogen into a reactor by adopting a Venturi ejector, and contacting with the catalyst in the reaction kettle to react; (2) after the reaction in the step (1), the gas in the reactor is sequentially subjected to primary condensation and secondary condensation to respectively condense the solvent and the water, the solvent of the primary condensation returns to the reaction kettle, the water of the secondary condensation is discharged, and the gas after the secondary condensation sequentially passes through an absorption tower and a desorption tower to capture non-aromatic hydrocarbon, the residual gas is used as recycle gas and returns to the Venturi ejector to enter the reaction kettle; and (3) pressurizing the reaction liquid discharged from the reaction kettle after the reaction in the step (1) through a circulating pump, feeding the reaction liquid into a heat exchanger to remove reaction heat, dividing the reaction liquid subjected to heat exchange into two streams through a cross-flow filter, feeding one stream of penetrating fluid into a rectification device, and feeding the other stream of concentrated liquid back to the reaction kettle for continuous reaction.

The invention provides an efficient technological method and system for preparing aromatic hydrocarbon through CO2 hydrogenation. The process method comprises the following steps: 1) mixing feed gas containing CO2 and H2 with recycle gas to obtain a mixture flow, and carrying out first-stage reaction on the mixture flow after heat exchange heating to obtain a first-stage reaction product; 2) performing heat exchange and separation on the primary reaction product to obtain a water phase, a gas phase and an oil phase, discharging the water phase out of the system, compressing most of the gas phase to obtain continuous circulating gas, and circulating the circulating gas back to the step 1) to continue the reaction; a small part of gas phase is discharged as purge gas; 3) distilling out light hydrocarbon from the top of the tower by rectifying the oil phase to obtain aromatic hydrocarbon-rich oil from a tower kettle; 4) heating the light hydrocarbon and then carrying out secondary reaction to obtain a secondary reaction product; and 5) carrying out heat exchange and separation on the secondary reaction product to obtain a gas-phase product and a liquid-phase product, discharging the gas-phase product as purge gas, and circulating the liquid-phase product back to the light component removal tower for rectification and separation to obtain aromatic hydrocarbon-rich oil. The first-stage reaction realizes high per-pass conversion of CO2, and the two-stage reaction is coupled to realize high selectivity of aromatic hydrocarbon.

The invention relates to the technical field of ardealite treatment technology, and discloses a method and a system for harmless treatment of ardealite, which are characterized in that fresh ardealite discharged by wet-process phosphoric acid filtration is re-pulped and then sequentially passes through a first-section reaction tank (added with fly ash and cement), a tank A of a second-section reaction tank, a tank B of the second-section reaction tank and a tank C of the second-section reaction tank for continuous reaction; performing solid-liquid separation to obtain harmless phosphogypsum; after the filtrate is settled, supernate is reused for repulping and lime milk preparation, and thick slurry is returned to the reaction tank; the reaction waste gas is washed with phosphoric acid acidic water, and washing liquid is reused for ore grinding; through multi-stage reaction and accurate pH control, the phosphogypsum stably reaches the class I solid waste standard, and the curing time is shortened from traditional several days to several hours; the system is deeply coupled with a front-end phosphoric acid system, and water balance and resource circulation of the system are realized by optimizing and filtering a washing water source and recycling steam condensate water; the process has the advantages of low cost, stable quality and flexible operation.

The invention relates to an olefin hydroformylation homogeneous catalysis continuous reaction process and system. The process comprises the following steps: mixing raw materials olefin, synthesis gas and a metal catalyst, and then carrying out hydroformylation reaction; removing a light component containing the product aldehyde from the hydroformylation reaction liquid to obtain a heavy component containing the metal catalyst; uniformly mixing the heavy component with a first extraction agent, and performing phase splitting to obtain a first heavy component phase and a first extraction agent phase; a metal catalyst and a second extraction agent are separated from the first extraction agent phase, the metal catalyst is circularly used for the hydroformylation reaction, and the second extraction agent is used as the first extraction agent mixed with the heavy components. Based on the characteristics of solubility difference and specific gravity difference between the metal catalyst and other substances in the heavy components under specific conditions, the heavy components in a reaction system are reacted at a lower temperature on the premise of not additionally adding a reagent which can influence the activity of the catalyst, and the activity of the catalyst can be well maintained within a longer reaction time.

The invention discloses a potassium propionate continuous synthesis process, and relates to the technical field of potassium propionate synthesis, the process comprises the following steps: S1, raw material pretreatment: selecting fermentation waste liquid containing propionic acid and acetic acid and potassium ore leaching liquid containing potassium hydroxide and potassium carbonate as composite raw materials, adding a composite chelating agent into the potassium ore leaching liquid, and uniformly stirring; according to the method, the composite raw material system composed of the fermentation waste liquid and the potassium ore leaching liquid is adopted, and the composite chelating agent is added, so that resource utilization of industrial waste is achieved, the raw material cost is reduced, meanwhile, impurities are prevented from interfering with continuous reaction, and through gradient temperature control-pressure cooperative regulation and linkage regulation of the PLC system, the yield is increased. The problem of product deliquescence caused by local overheating is solved, volatilization loss of propionic acid is reduced, the adaptability of the technology to raw material batch fluctuation is improved through raw material concentration online detection and dynamic parameter adaptation, the continuous production stability is guaranteed, and finally synchronous improvement of the potassium propionate synthesis efficiency and the product quality is achieved.

The invention discloses a micro-channel continuous reaction device applied to gas-liquid oxidation reaction. The micro-channel continuous reaction device comprises a feeding system, a micro-channel reaction module, a temperature control system, a product collection system and a control regulation system, the feeding system conveys a gas raw material and a liquid raw material into the micro-channel reaction module; the micro-channel reaction module comprises three or more micro-channel units which are connected in series, and each micro-channel unit comprises a plurality of gas-liquid mixers and a plurality of enhanced mixing reactors; the temperature control system is used for accurately controlling the reaction temperature; the product collecting system is used for separating and collecting reaction products; and the control adjusting system is used for monitoring and adjusting reaction conditions in real time. According to the invention, efficient mixing and uniform distribution of gas and liquid phases can be realized, the reaction efficiency is remarkably improved, side reactions are reduced, real-time monitoring and adjustment of reaction conditions are realized, and the operation stability and safety are improved.

The invention discloses a tubular continuous flow preparation process and a tubular continuous flow preparation device for (R)-(+)-2-(4-hydroxyphenoxy) propionic acid. A hydroquinone aqueous solution and a sodium hydroxide solution are respectively preheated and mixed, and then enter a tubular reactor I for reaction to obtain a hydroquinone sodium alkaline solution. And pumping (S)-(-)-2-methyl chloropropionate into a reaction system, respectively preheating the (S)-(-)-2-methyl chloropropionate and the hydroquinone sodium alkaline solution obtained in the previous step, mixing the (S)-(-)-2-methyl chloropropionate and the hydroquinone sodium alkaline solution, carrying out nucleophilic substitution reaction in a tubular reactor II, and carrying out post-treatment on the reaction completion solution to obtain the high-purity (R)-(+)-2-(4-hydroxyphenoxy) propionic acid. According to the method, an optimization method combining a tubular reaction technology and kinetic research is adopted, and MATLAB simulation and experimental verification are combined, so that the reaction yield reaches 95% or above, and the purity reaches 99% or above; the method is high in reaction controllability, fully continuous in reaction process, convenient to operate, low in cost and suitable for industrial production, and the use amount of hydroquinone is greatly reduced.

The invention discloses a non-catalytic and catalytic coupling synthesis gas preparation device and application thereof to synthesis gas preparation, the device comprises a non-catalytic reactor, a catalytic reactor, a pre-catalytic reactor, a waste heat boiler, a plurality of heat exchangers, a connecting pipeline and the like, and the pre-catalytic reactor is also provided with a heat exchanger structure; a pre-catalytic reaction cavity is arranged between a cold end inlet and a hot end outlet of the pre-catalytic reactor; the heat exchanger is used for preheating oxygen and part of raw materials and feeding into the non-catalytic reactor; the rest of the raw materials are preheated again and then fed into the pre-catalytic reactor and the non-catalytic reactor, reactants of the pre-catalytic reactor are fed into the catalytic reactor for continuous reaction, reactants of the catalytic reactor are used for supplying heat to the pre-catalytic reactor, the heat exchanger and the waste heat boiler, and the waste heat boiler can be used for preparing raw material steam; and heat balance adjustment of the whole device can also be participated. The device is high in heat utilization rate and conversion rate, can adjust the hydrogen-carbon ratio of the synthesis gas, and is particularly suitable for preparing methanol synthesis gas from natural gas and the like.

The present invention relates to a multistage series microreactor and a fluid mixing method. The microreactor includes a base internally etched with a fluid passage, the base being provided with a fluid inlet and a fluid outlet which are communicated with the fluid passage, where the fluid passage includes a plurality of micro mixing tanks, a jet port is formed at an inlet of the micro mixing tank, adjacent micro mixing tanks are connected by jet port at a contraction section, and a splayed flow baffle plate and a flow splitting column which are arranged corresponding to the jet port are provided in the micro mixing tank, the flow splitting column being arranged below the splayed flow baffle plate. By means of a jet manner, a fluid to be mixed in the invention can be continuously split, compounded, stretched and crushed, thereby realizing rapid mixing and efficient, continuous reaction.

The invention relates to a CO2 capture and dry reforming conversion integrated reaction system and method for coupling biogas and boiler flue gas. The reaction system mainly comprises a gas mixer, a first heat exchanger, a rotary trapping reaction furnace, a rotary dry reforming reaction furnace, a biogas storage tank and a coal-fired boiler flue gas pipeline, and the gas mixer is used for preliminarily mixing flue gas and biogas to provide stable and continuous reaction gas; the first heat exchanger realizes simultaneous proceeding of trapping and conversion reactions between double reactors of the rotary trapping reaction furnace and the rotary dry reforming reaction furnace, and realizes gas heat exchange; meanwhile, calcium carbonate generated by the rotary trapping reaction furnace and calcium oxide generated by the rotary dry reforming reaction furnace can be mutually utilized; and low-energy-consumption reaction is realized between the two reactors through a heat pump system. According to the invention, CO2-containing coal-fired boiler flue gas is reacted with biogas, the reaction waste heat is fully utilized, and the energy consumption of the calcium cycle carbon dioxide capture and conversion integrated system is reduced.

The invention discloses application of nitrogen-doped bamboo activated carbon in room-temperature oxidation of methyl mercaptan, and belongs to the technical field of sulfur-containing foul pollutant treatment. According to the catalyst, bamboo charcoal is used as a carbon source, 1, 10-phenanthroline or ammonia gas and 1, 10-phenanthroline are used as nitrogen sources, and the nitrogen-doped bamboo activated carbon catalyst is prepared through mixed grinding and high-temperature calcination. The nitrogen-doped bamboo activated carbon prepared by the method has abundant topological defects and structural alkaline sites, and has remarkable advantages in the aspect of oxidative degradation of methyl mercaptan at room temperature. The catalyst can realize catalytic degradation of methyl mercaptan at room temperature, can still keep the degradation rate of 85% or above after continuous reaction for 150 hours, and shows excellent catalytic activity and stability.

The utility model relates to the field of biomass gasification energy sources, in particular to a biomass two-stage gas making mechanism which comprises a front section gas making mechanism, a connecting auger mechanism, a rear section gas making mechanism, a discharging auger mechanism and a dust collecting mechanism. The rear-section gas making mechanism and the auger mechanism are each provided with an auger rotary vane and a transmission mechanism, the auger rotary vanes are connected with the transmission mechanisms, the transmission mechanisms are used for controlling the running speed of the auger rotary vanes, and biomass materials enter the next mechanism connected with the mechanism after being extruded and pushed by the auger rotary vanes in the mechanism where the biomass materials are located; biomass materials enter the device from the i direction for reaction, carbonized solid materials are discharged from the o direction, gasified combustible gas is discharged from the p direction, and continuous carbonization and gasification reaction of biomass is achieved, so that the efficiency of obtaining gaseous fuel is improved, energy consumption is reduced, and meanwhile the tar content in the obtained gaseous fuel can be greatly reduced.

The present invention discloses a method for synthesizing azoxystrobin, which includes: in a water-oil system of an organic solvent and an aqueous solution of trimethylamine, the compound shown in Formula I reacts with 2-cyanophenol to obtain azoxystrobin; wherein, the molar ratio of the compound shown in Formula I to trimethylamine is 1:(0.96-2). The synthesis method of the present invention has higher reaction efficiency, does not generate CO2, avoids the risk of entrainment and overflow of materials, reduces side reactions, reduces solid waste emissions, and is green and environmentally friendly. The present invention does not need to use solid sodium carbonate or potassium carbonate, and the material reaction system is an oil-water reaction system, so the reaction efficiency is greatly improved, and the yield can also be maintained above 95%. It can take into account both efficiency (timeliness) and yield, and is easy to realize continuous reaction, providing technical support for intelligent and unmanned production; and trimethylamine can be recycled, reducing the use of one raw material, and thus does not require cumbersome treatment of mixed salts and their wastewater, and the energy consumption is significantly reduced.

The invention provides an intelligent copper release nano preparation triggered by a magnetic effect as well as a preparation method and drug application thereof. The preparation is ES (at) Fe3O4 (at) SiO2-Cu; the preparation method comprises the following steps: adding FeCl3. 6h2O and CH3COONa into ethylene glycol, and carrying out hydrothermal reaction, washing and magnetic separation; dispersing the ferric oxide magnetic fluid in ammonia water for ultrasonic treatment, adding an ethanol solution containing 20% of tetraethyl silicate and a copper nitrate mixed solution for continuous reaction, washing with ethanol water, performing magnetic separation, dispersing the Fe3O4-coated SiO2-Cu fluid in an ammonium nitrate isopropanol solution, adding isopropanol water for ultrasonic treatment after magnetic separation, washing with ethanol water, replacing water with pure ethanol, and performing vacuum drying to obtain Fe3O4-coated SiO2-Cu; dispersing the mixture and ES in water, and carrying out violent ultrasonic oscillation; and dialyzing the bag overnight, and collecting to obtain ES (at) Fe3O4 (at) SiO2-Cu. The device is high in penetration depth, suitable for deep tumor treatment and good in heating efficiency under an alternating magnetic field.

The invention relates to the field of microorganism reinforced rock-soil bodies, in particular to a test method for reinforcing a discontinuous structural surface of a hydro-fluctuation belt rock body by using microorganisms. The method comprises the following steps: sampling on site and manufacturing a fractured rock mass sample containing a through structural plane; culturing the microbial bacterial liquid, and preparing microbial sludge with urease activity; the method comprises the following steps: uniformly smearing microbial mud on a fissure surface, splicing a fissure rock mass, completely soaking the fissure rock mass in a high-concentration reaction liquid for continuous reaction, and further inducing to generate a calcium carbonate cementitious body to fill the fissure surface; and extracting the pore structure in the rock mass through a CT scanning technology, and evaluating the reinforcing effect. According to the method, the filling uniformity of the fissure surface is remarkably improved, and the problems that a traditional MICP grouting method is low in reinforcing efficiency and uneven in calcium carbonate cementation body distribution are solved. The method has the advantages of being environmentally friendly, efficient and free of pollution, and a new technical thought is provided for treatment of the three gorges reservoir area hydro-fluctuation belt fractured rock mass.

The invention relates to the technical field of organic chemical synthesis, and discloses a continuous production process of a cationic etherifying agent, which comprises the following steps: taking trimethylamine hydrochloride and epoxy chloropropane as raw materials; the method comprises the following six steps: raw material pretreatment, premixing, continuous reaction, continuous separation, refining and product storage: mixing and dissolving trimethylamine hydrochloride and a solvent, preparing a catalyst solution, uniformly mixing the three materials through a static mixer, feeding into a multi-stage tubular reactor, and carrying out segmented temperature control continuous reaction, and performing flash evaporation solvent removal and rectification on the reaction product to obtain a crude product, and performing ion exchange impurity removal and reduced pressure distillation refining to finally obtain a high-purity product. The method solves the problems of low yield and more byproducts in the traditional process, and is suitable for industrial large-scale production.

The invention provides a cementitious material carbon absorption centrifugal continuous reaction device and a cementitious material carbon absorption centrifugal continuous reaction method. The cementitious material carbon absorption centrifugal continuous reaction device comprises a reaction kettle, the top of the reaction kettle is provided with a feeding port, a smoke exhaust port and an activator inlet port, the side wall of the reaction kettle is further provided with a plurality of gas distribution holes, and the bottom of the reaction kettle is further provided with a discharging port; the reaction kettle further comprises a stirring vertical shaft, the stirring vertical shaft is rotationally arranged in the reaction kettle, and a plurality of groups of stirring blades are further arranged on the stirring vertical shaft in the axial direction; a plurality of centrifugal stirring discs are horizontally arranged; the stirring vertical shaft is coaxially sleeved through a central through hole of each centrifugal stirring disc; each centrifugal stirring disc is positioned between two adjacent groups of stirring blades; and a plurality of mixed flow baffles are uniformly arranged on the upper surface of each centrifugal stirring disc around the stirring vertical shaft. According to the device, discharging can be achieved in the feeding process, material mixing is more uniform, the quality of the discharged negative carbon gel material is higher, the time for discharging the negative carbon gel material is shortened, the grouting and filling speed is increased, and the construction period is shortened.

The application relates to a sodium-intercalated composite hydroxide and a secondary battery positive electrode material, and a sodium composite hydroxide preparation method which comprises the following steps: S1, mixing water, a complexing agent, a precipitant, an optional additive and a mixed metal solution to perform a coprecipitation crystallization reaction, performing solid-liquid separation after the reaction, and obtaining a hydroxide precursor; S2, adding the hydroxide precursor obtained in S1, a sodium metal solution and an oxidizing agent into a pipeline reactor, wherein the molar ratio of the hydroxide precursor to sodium ions in the sodium metal solution is 10:(0.5-5), the reaction temperature in the pipeline reactor is controlled to be 110-300 DEG C, the reaction pressure is 1.0-10 MPa, the continuous reaction is performed for 0.5-20 hours, the pipeline reactor is discharged after the continuous reaction, the solid-liquid separation is performed on the obtained material liquid, the solid phase is obtained, the solid phase is dried, and a sodium-intercalated composite hydroxide is obtained. The sodium-intercalated composite hydroxide is subjected to heat treatment to form a solid solution, is further calcined to form a secondary battery positive electrode material, and the uniformity, stability and cycle performance of the material are improved.

A method for preparing trialkoxysilane by using a fluidized bed comprises the following steps: preheating the fluidized bed in a protective atmosphere; the heating temperature of the bottom of the fluidized bed is higher than that of the middle of the fluidized bed; pushing a silicon powder composition into the preheated fluidized bed by using preheated protective gas, wherein the silicon powder composition is a mixture of silicon powder and a silicon copper contact body; driving alkyl alcohol gas to enter the preheated fluidized bed by using preheated protective gas; under the protective atmosphere, the reaction temperature in the fluidized bed is maintained, the silicon powder composition and alkyl alcohol gas react in the fluidized bed, and trialkoxysilane is generated. According to the method for preparing the trialkoxysilane by adopting the fluidized bed, a water-free and oxygen-free reaction atmosphere is fully created in the whole reaction system, continuous reaction of the trialkoxysilane is avoided due to the integration of reaction and separation, and the subsequent separation difficulty is reduced while the product selectivity is improved.

The invention relates to the technical field of catalyst preparation, and particularly discloses a catalyst for efficient coal-based synthesis of dimethyl carbonate and a preparation method thereof.The catalyst comprises, by weight, 85%-88% of a coal-based activated carbon carrier, 7%-8% of copper oxide, 3%-4% of zinc oxide, 1%-2% of aluminum oxide and 1%-2% of rare earth oxide; the coal-based carbon material is used as the carrier, so that the thermal stability and the surface adsorption capacity of the catalyst are remarkably improved; after CeO2 is introduced, the redox cycle efficiency is improved, and the methanol conversion rate and DMC selectivity are enhanced; a pore structure is improved through a coal tar blending carbonization technology, and reactant molecule diffusion and product desorption are facilitated; the catalyst is stable in structure, long in continuous reaction time and good in renewability and industrial adaptability, organic functional groups in coal can be directionally reserved through multiple treatment means, high-density defect sites can be constructed, and the loading performance of the catalyst is enhanced.

The utility model discloses a fixed bed reactor for continuous flow efficient catalytic hydrogenation, which comprises a reactor main tank body, and an upper partition plate, a plurality of middle partition plates and a lower partition plate are fixed in the reactor main tank body; a plurality of vertical reaction cylinders are inserted into the corresponding through holes of the upper partition plate, the middle partition plate and the lower partition plate, and the outer side walls of the vertical reaction cylinders are welded and fixed on the inner side walls of the corresponding through holes; the upper partition plate is located at the upper part of the reactor main tank body, the lower partition plate is located at the lower part of the reactor main tank body, and the middle partition plate is located at the reactor main tank body between the upper partition plate and the lower partition plate; in the continuous reaction process, heat exchange media with different temperatures or heat exchange media with the same temperature flow in the upper heat exchange cavity, the middle heat exchange cavity and the lower heat exchange cavity, so that the reaction temperature of each stage is controlled, the heat exchange effect is met, and the reaction effect can reach the optimal state.

This invention belongs to the field of photocatalytic materials and new energy technology, and discloses a method for preparing a Rh-modified Cs₂AgBiBr₆ / CdS heterojunction photocatalyst. The method includes: preparing Cs₂AgBiBr₆ nanoparticles via antisolvent precipitation, preparing CdS nanorods via hydrothermal method, subsequently constructing a heterojunction through in-situ growth, and loading a Rh co-catalyst using photoreduction. This invention effectively overcomes the technical bottleneck of structural instability of traditional perovskites in polar solvents by introducing a Cs₂AgBiBr₆ double perovskite with a rigid lattice structure. Experiments show that the catalyst retains its structural integrity after immersion in ethanol for 168 hours and under different atmospheres, and exhibits excellent performance in the photocatalytic dehydrogenation of ethanol, with a hydrogen production rate as high as 49.15 mmol·g⁻¹. ‑1 ·h ‑1 The apparent quantum efficiency at 420 nm is 22.5%, and it remains stable during a 60-hour continuous reaction. This invention provides a new strategy for developing efficient and stable lead-free perovskite photocatalytic systems.

The invention provides a crystallization kettle for magnesium lithium silicate production, and relates to the field of magnesium lithium silicate production. The device comprises a base and a conveying device, the upper surface, close to the rear end, of the base is fixedly connected with a limiting plate, the upper surface of the base is movably connected with a heating device, and the rear end of the heating device is movably connected to the inner side surface of the limiting plate. According to the crystallization kettle device, the heating device is arranged to heat the crystallization kettle device, the transportation device is arranged to transport the crystallization kettle device into the heating device, the crystallization kettle device is moved out when cooling is needed, another crystallization kettle device is replaced for continuous reaction, a new reaction does not need to be carried out after cooling in the crystallization kettle device is completed, the time is saved, and the production efficiency is improved. The crystallization kettle device is simple in structural design, a plurality of crystallization kettle devices can be produced for replacement, the production efficiency is improved, the crystallization kettle device is continuously rotated by 90 degrees in the forward direction and the reverse direction through the arranged stirring device, so that raw materials in the tank body are stirred through the stirring rod by utilizing inertia, and the stirring efficiency is improved.

The invention provides an energetic complex K-BTE and a continuous preparation method and application thereof.The continuous preparation method comprises the steps that 1, 2-bis (tetrazole-5-yl) ethane serves as an initial raw material, a ligand solution and a metal ion salt solution are continuously injected into a continuous flow reaction unit through an injection pump, and energetic complex crystals are obtained through filtering, washing and drying; a novel energetic complex preparation method which is simple and continuous in process and mild in reaction condition is developed, the energetic complex K-BTE which is novel in structure and excellent in comprehensive performance is prepared for the first time, and the energetic complex K-BTE has the characteristic of high thermal stability and also has the advantages of being simple and efficient in process method and safe and controllable in process; the thermal decomposition temperature of K-BTE reaches up to 366.5 DEG C, the actually measured impact sensitivity is greater than 40J, the friction sensitivity is between 240N and 360N, and meanwhile, the thermal decomposition of ammonium perchlorate is catalyzed. Due to the excellent performance of the K-BTE, the K-BTE has huge application potential in the field of catalyzing the combustion efficiency of solid propellants as an energetic complex.