235 results about "Phase reaction" patented technology

The invention belongs to the technical field of electrocatalytic materials, and relates to a two-phase bimetallic carbide heterostructure electrocatalyst and a preparation method and application thereof. The composition of the two-phase bimetallic carbide heterostructure electrocatalyst is WMoC2 / WVC2, and preferably, the mass percent of the WMoC2 is 40%-80%, and the mass percent of the WVC2 is 20%-60%. According to the invention, the bimetallic heterostructure WMoC2 / WVC2 electro-catalytic hydrogen evolution material is prepared through a step-by-step hydrothermal method and a solid-phase reaction method. The preparation method is green and pollution-free, the raw material cost is low, and the electrocatalytic activity in an alkaline environment is good.

The invention discloses a jet type micro-droplet generation device and a micro-droplet generation method thereof, and belongs to the technical field of liquid-liquid heterogeneous / homogeneous reaction devices. The device comprises an injection pipe, the injection pipe is used for conveying a first liquid phase, the interior of the injection pipe is of a cavity structure, the injection pipe comprises a feeding section, a mixing section, a diffusion section and a feeding pipe, the feeding section, the mixing section and the diffusion section are sequentially communicated and coaxially arranged, the feeding pipe is used for conveying a second liquid phase, and the feeding pipe penetrates through the side wall of the feeding section and extends into an inner cavity of the injection pipe; a discharging opening of the feeding pipe is formed in the mixing section, and an annular flowing space is formed by the outer wall of the feeding pipe and the inner wall of the mixing section. The feeding pipe extends into the mixing section to form an annular flowing space, and a second liquid phase is dispersed into small liquid drops by fully utilizing the annular space and a strong shear flow field in the mixing section. The method is suitable for a liquid-liquid heterogeneous / homogeneous system, including a liquid-liquid heterogeneous / homogeneous reaction crystallization system generated by solid particles.

The invention discloses an experimental system and method for accelerating and promoting a gas-liquid-solid three-phase reaction in a multi-stage manner, and relates to the technical field of reaction equipment and carbon emission reduction. The experiment system comprises: a reaction kettle provided with a visual window and an atomization device mounting groove; the floating type piezoelectric ceramic atomization device is embedded in the atomization device mounting groove; the gas injection device comprises a gas hole distribution pipe and a gas injection pump connected with the gas hole distribution pipe; uniformly distributed micropores are formed in the pore distribution pipe; the magnetic stirring device comprises a magnetic driving base, a rotating speed controller and a magnetic stirrer arranged in the reaction kettle; the magnetic stirrer is arranged above the air hole distribution pipe; the bracket net is arranged on one side, deviating from the air hole distribution pipe, of the magnetic stirrer; and the temperature control device comprises a constant-temperature bath and a temperature controller for controlling the temperature of the constant-temperature bath. The experimental system is compact in structural design, modularized, simple and convenient to operate, capable of efficiently accelerating the gas-liquid-solid three-phase reaction and suitable for various experimental studies.

The invention relates to the technical field of sodium silicate production, and particularly discloses a method for preparing sodium silicate by dissolving fluorine-containing silicon dioxide with alkali lye, which comprises the following steps: step 1, adding fluorine-containing silicon dioxide, sodium carbonate and water into a reaction kettle with a stirrer and a heating device to obtain a mixed material; 2, fully and uniformly stirring the mixed material obtained in the step 1, heating the mixed material by using a reaction kettle, and controlling the reaction temperature and the reaction time for reaction; and 3, filtering and separating the reaction product obtained in the step 2 to obtain a sodium fluoride filter cake and a sodium silicate solution. Sodium carbonate and sodium bicarbonate are used for dissolving silicon dioxide in a liquid phase reaction to prepare sodium silicate, the process is green and environment-friendly, sodium carbonate in chemical production can be effectively utilized, energy is saved, consumption is reduced, and the environment is protected. The technical problems that in the prior art, the temperature is high in the reaction process, a large amount of heat needs to be consumed, and energy consumption is high are solved.

The invention belongs to the technical field of fluorine chemical industry, and particularly relates to a continuous production process of heptafluoroisobutyryl fluoride. The process is carried out in a tubular reactor, the tubular reactor is divided into a first preheating section, a second reaction section and a third reaction section, a fluorinated molecular sieve catalyst is filled in the second reaction section and the third reaction section, each reaction section is respectively heated to a corresponding preset temperature, carbonyl fluoride and hexafluoropropylene which are mixed and preheated are introduced into the tubular reactor, and a fluorinated molecular sieve catalyst is introduced into the tubular reactor. Enabling the gas to sequentially flow through each section of the tubular reactor, contacting and reacting with the fluorinated molecular sieve catalyst in the second reaction section and the third reaction section, and condensing the gas discharged from the outlet end of the tubular reactor to obtain a heptafluoroisobutyryl fluoride product. According to the process, carbonyl fluoride and hexafluoropropylene are used as gas-phase reaction raw materials, and heptafluoroisobutyryl fluoride is synthesized through a one-step continuous flow rapid reaction. The reaction route is short, the reaction conversion rate and selectivity are high, and industrial large-scale production is easy to realize.

The present invention relates to the technical field of tert-butyl hydroperoxide, and discloses a tert-butyl hydroperoxide processing homogeneous reaction kettle, the tert-butyl hydroperoxide processing homogeneous reaction kettle comprises a homogeneous reaction kettle body, a material inlet and a connection port, the material inlet and the connection port are arranged at the top of the homogeneous reaction kettle body, and a mixing mechanism is arranged in the homogeneous reaction kettle body, a heating mechanism is arranged on the outer side of the homogeneous reaction kettle body, a mixing mechanism comprises a driving motor, a connecting rod, a supporting rod, a stirring plate and a guide groove, and the driving motor is mounted in the middle of the top of the homogeneous reaction kettle body. According to the homogeneous reaction kettle for processing the tert-butyl hydroperoxide, tert-butyl hydroperoxide reactant mixed liquid is stirred by the stirring plate and the guide groove, so that the mixed liquid can move upwards or downwards, the reactants of the tert-butyl hydroperoxide can be comprehensively mixed, and the reactants of the tert-butyl hydroperoxide react more thoroughly; impurities in the tert-butyl hydroperoxide are reduced, and the quality of the tert-butyl hydroperoxide is improved.

The utility model relates to the technical field of vinyl chloride polymerization production, in particular to a safe feeding device of a solid-liquid-gas three-phase reaction kettle. The safe feeding device of the solid-liquid-gas three-phase reaction kettle comprises a reaction kettle and a pressure stabilizer, the pressure stabilizer is connected with a desulfurization tower through a deoxidation adsorption tower, the desulfurization tower is connected with the reaction kettle through a pre-heater, the reaction kettle is connected with a feeding tank, a temperature control coil pipe is arranged in the reaction kettle and connected with a refrigerating machine through a pipeline, and the refrigerating machine is connected with the deoxidation adsorption tower through a pipeline. And a pre-heating device coil pipe is arranged in the pre-heating device. According to the device, through the cooperative use of the heating sleeve, the connecting pipeline and the pre-heating device coil pipe, the waste heat of the reaction kettle is used for pre-heating a gas-phase raw material, so that the feeding temperature is ensured to reach a proper range, and the influence on the temperature in the reaction kettle due to the too low feeding temperature is avoided, thereby ensuring that a polymerization reaction can be carried out under a stable temperature condition; and the stability of product quality is improved.

The invention relates to a method for producing methylamine by a generally exothermic gas-phase reaction of methanol and ammonia as reactants in the presence of a heterogeneous catalyst at a pressure in the range of 15 to 35 bar. The reactants are evaporated in one or more heat exchangers and superheated prior to being fed to the reactor, wherein the heat exchangers in turn are heated with a stream of hotter product gas from the reactor. In addition to methylamine (monomethylamine, dimethylamine, and trimethylamine), the product gas stream contains unconverted reactants, water, and any other reaction by-products. To control the reactor inlet temperature and limit it to a temperature in the range of 350 DEG C to 410 DEG C, a suitable quenching liquid is introduced into the hot product gas stream prior to feeding the hot product gas stream to a heat exchanger for heating the reactants. Evaporation and overheating of the added quenching liquid removes the corresponding amount of energy extracted from the hot product gas stream, with the result of efficient and rapid cooling of the hot product gas stream. As a result, the temperature difference between the cold side and the hot side of the heat exchanger is small, which means less energy is transferred to the reactant stream, and thus its reactor inlet temperature can be adjusted or limited.

The invention belongs to an amide intermediate treatment device and method for hydrazine hydrate production. Comprising a concentration tank, the concentration tank is provided with a water-phase reaction liquid inlet pipeline and a catalyst inlet, the catalyst inlet is connected with a quartz sand catalyst preparation unit, an outlet of the concentration tank is connected with a concentrated material inlet of an intermediate recovery kettle, and the intermediate recovery kettle is further connected with an ammonia feeding pipeline. An ammoniation liquid outlet of the intermediate recovery kettle is connected with a separation and recovery unit, and a liquid phase outlet of the separation and recovery unit is connected with a hydrazine compound synthesis section; a steam discharge pipeline is arranged at the top of the concentration tank; the method has the advantages that moisture in the water-phase reaction liquid can be removed, ammonium formate is converted into formamide and recycled, meanwhile, metal ions are prevented from being contained in ammoniation liquid, and further, the treatment cost is reduced and continuous treatment is achieved on the basis of energy conservation and consumption reduction.

The invention belongs to the technical field of organic synthesis, and particularly discloses a preparation method of N-isobutyl-4-chloropyrrolidone, and the method comprises the following steps: adopting an immobilized CAL-B enzyme as a catalyst, carrying out Michael addition in a water-phase buffer system, and synthesizing N-isobutyl-beta-alanine ethyl ester; a water / supercritical CO2 two-phase reaction system is adopted, and N-isobutyl-N-(chloracetyl)-beta-alanine ethyl ester is synthesized through amidation. A hydrotalcite solid base catalyst is adopted, Dieckmann condensation is carried out in a supercritical CO2 / cosolvent system, and N-isobutyl-4-chloropyrrolidone is synthesized. According to the preparation method of the N-isobutyl-4-chloropyrrolidone, the synthesis of the N-isobutyl-4-chloropyrrolidone is realized through three-step reaction, the defects of a conventional method are avoided, and the preparation method has the advantages of easily available raw materials, few reaction steps and high selectivity, and is suitable for industrial production.

The application relates to the technical field of gas-liquid two-phase mixing, and discloses a multiphase reaction system and a multiphase reaction method, the system comprising a mixer and a reactor; wherein the mixer comprises a liquid flow guide pipe 1, a gas-liquid mixing pipe 2 and a gas cavity 3; wherein the liquid flow guide pipe 1 comprises a straight pipe section and a reduced diameter section, the reduced diameter section is connected with the gas-liquid mixing pipe 2; the gas-liquid mixing pipe 2 is connected with the reactor through the gas cavity 3. The multiphase reaction system provided by the application can make the gas phase contact with the liquid phase in the form of micro-bubbles, and can continuously provide micro-bubbles, thereby strengthening the gas-liquid two-phase mass transfer process and improving the reaction rate, and can be applied in liquid phase hydrogenation technology, and is especially suitable for hydrocarbon oil hydrogenation.

The invention belongs to the technical field of catalysis, and particularly relates to a method for regulating and controlling water-phase Mannich reaction activity and enantiomer selectivity based on a Pickering emulsion interface. According to the method, a molecular catalyst is anchored on the surface of a solid emulsifier to form a stable Pickering emulsion system, and the activity and enantioselectivity of a water-phase Mannich catalytic reaction can be regulated and controlled by utilizing the interface characteristics of the Pickering emulsion system. According to the method, efficient utilization of the catalyst and precise regulation and control of the spatial configuration of the chiral product are achieved through the interfacial effect, the method is simple and easy to implement, the substrate application range is wide, and a new strategy is provided for green synthesis of chiral drugs and fine chemicals.

The invention discloses a method for growing a gallium oxide film by using a gallium antimonide metal source, which comprises the following steps of: growing a gallium oxide epitaxial film by using gallium antimonide as a gallium metal source, oxygen as an oxygen source and argon as carrier gas through a low-pressure gas-phase chemical reaction; the sublimation temperature of gallium antimonide is low, and gallium antimonide participates in the reaction as a metal source, so that the temperature of the vapor-phase growth gallium oxide epitaxial film can be effectively reduced; the gallium oxide epitaxial film grown by the method is good in crystallinity and compact in surface, the growth time can be effectively shortened through a low-temperature low-pressure gas phase reaction technology, the production cost is saved, and commercial application is facilitated.

This invention discloses a polyaniline-modified Pt / C hydrogen evolution electrode with low noble metal loading, its preparation, and its application. The hydrogen evolution electrode comprises: a carbon fiber layer; a carbon powder layer containing polyaniline, perfluorosulfonic acid resin, and carbon powder; a polyaniline nanofiber layer; and a catalyst layer containing polyaniline, a Pt / C catalyst, and perfluorosulfonic acid resin. Each layer promotes electron or proton conduction, ensuring that both can smoothly reach the three-phase reaction region to participate in the hydrogen evolution reaction. Simultaneously, each layer has high porosity, ensuring timely drainage of the hydrogen evolution reaction product liquid water and avoiding flooding. The second, third, and fourth layers all contain polyaniline as a catalyst to promote the hydrogen evolution reaction, with the catalyst content distributed from low to high, ensuring that the hydrogen evolution reaction proceeds in stages and avoiding excessively fast local reaction rates that could cause concentration polarization and lead to a decrease in electrolysis performance. The hydrogen evolution overpotential of the polyaniline-modified Pt / C hydrogen evolution electrode of this invention is superior to that of the traditional Pt / C electrode, thus promoting the hydrogen evolution reaction.

The application discloses a preparation method and application of a multi-phenyl phosphorus oxide compound and belongs to the technical field of organic synthesis. Different properties of raw materials are respectively dissolved through double solvents, a catalyst is added into the system, and the entering of the alkali metal salt reactant into the organic phase reaction is helped to be dissolved to obtain a molecular level reactant, so that the reaction is promoted to be completely carried out, the yield of a product is improved, the proportion of impurities, such as the reactant, contained in the product is reduced, the purity of the product is improved, and the high-purity product is a material with low dielectric property. The material is tested in various performances, and excellent flame retardance and low dielectric constant are obtained.

The present invention relates to solvothermal vapor synthesis methods for the crystallization of a phase from a mixture of selected inorganic or organic precursors in an unsaturated vapor-phase reaction medium.

The invention discloses a spiral sleeve type gas-liquid-solid three-phase photochemical continuous flow reactor and a using method thereof.The reactor comprises a device shell, a reaction assembly and a control module, and the reaction assembly is composed of a spiral flow reactor, a coaxially-integrated columnar light source and a feeding and discharging unit; wherein the columnar light source is arranged in the center in the spiral flow reactor to realize uniform illumination; and a composite heat dissipation structure is arranged in the device shell. The reactor adopts a spiral flow channel design, so that the retention time of materials is remarkably prolonged, the gas-liquid mixing and mass transfer efficiency is enhanced, an anti-blocking filtering unit and a plurality of catalyst distribution modes are arranged, and fixed coating or mechanical filling can be selected according to reaction requirements. The spiral casing pipe is adopted as a reaction channel, so that the residence time of reaction materials is prolonged, sufficient reaction is facilitated, meanwhile, the mixing degree and the mass transfer effect of the materials are improved, the gas treatment capacity is enhanced through the large cavity volume design, and the gas-liquid-solid three-phase reaction can be well adapted.

The invention relates to a process for producing phosgene by gas-phase reaction of carbon monoxide and chlorine in the presence of a catalyst in a reactor which comprises a plurality of parallel catalyst tubes which are filled with the catalyst and around which at least one fluid heat transfer medium flows, where a feed stream of a mixture of a chlorine input stream and a carbon monoxide input stream is fed into the catalyst tubes and is allowed to react to give a phosgene-comprising product gas mixture, wherein the reaction is carried out at an area load of more than 2.75 kg of phosgene / m2s. The invention also provides a reactor for carrying out the process.

The invention relates to a gas phase chemical reaction heat measurement system and method based on a heat flow method calorimeter (RC1e type). An inert medium and a small gas phase reactor are additionally arranged in a reaction kettle of an original heat flow method calorimeter, a gas raw material is introduced into the gas phase reactor for reaction, and heat released by the reaction is transferred to a calorimetric system through the inert medium for real-time monitoring. The method solves the problem that a traditional heat flow method calorimeter cannot directly measure gas-gas reaction heat, the application range of the calorimeter is expanded, and the method is suitable for gas-phase reaction thermodynamic research and process safety evaluation under high-temperature and high-pressure conditions.

This invention discloses a catalytic reactive distillation unit, apparatus, and method. The catalytic reactive distillation unit includes: a reaction mass transfer channel, the upper end of which receives low-temperature liquid-phase reactants flowing downwards, and the lower end of which receives high-temperature gas phase flowing upwards; the reaction mass transfer channel contains a catalyst layer and a packing layer, with the catalyst layer positioned above the packing layer, and a first space between them; and a rising gas bypass, located outside the reaction mass transfer channel and connected to the first space. The liquid-phase products after the catalytic reaction merge with the high-temperature gas phase in the packing layer and undergo gas-liquid mass transfer. The rising gas phase after mass transfer carries the light components from the liquid-phase products into the rising gas bypass, completing mass transfer separation. This invention, through the setting of the rising gas bypass, not only increases the gas phase flow rate and effectively reduces the pressure drop within the reaction mass transfer channel, but also effectively solves the space occupation problem of the equipment. This invention can clean the blockage of the catalyst filter without additional power and can realize online replacement of the catalyst and / or packing.

The invention relates to the technical field of fluorination equipment, in particular to a continuous reaction device of a fluorocarbonic ester-based solvent, which comprises a reaction main body internally provided with a reaction cavity; the gas-solid premixing module is tangentially communicated with the bottom of the reaction cavity and is used for enabling the fluorine gas and the solid catalyst to enter the reaction cavity together after being fully mixed; the liquid distribution module is arranged at the top of the reaction cavity and uniformly distributes reaction liquid into the reaction cavity; and the heat exchange reaction module is arranged in the reaction cavity, is positioned below the liquid distribution module, and is used for guiding the mixed gas flow and the reaction liquid to be in full countercurrent contact and directly exchanging heat on a reaction interface. According to the continuous reaction device provided by the invention, three-phase reactants are guided to be uniformly distributed in the reaction cavity through the heat exchange reaction module and then are fully contacted and reacted, and heat in the reaction process is timely exchanged and guided out, so that normal continuous production is ensured.

The application discloses a refining device and method and application of a nitrogen-containing solvent precursor. The refining method takes liquid-phase material obtained through cryogenic separation of a gas-phase mixture obtained through an ammoniation reaction as raw material, and obtains acetonitrile main product, acetamide by-product and recycled unreacted raw material through the steps of side-line rectification, component rough separation, three-waste separation and differential pressure separation, and avoids the discharge of polluting gas by dissolving trace impurities and non-condensable gas at low temperature through self-produced wastewater. The application can be used for the separation and refining of liquid-phase reaction product of methyl acetate ammoniation acetonitrile, and is simple in process, friendly to environment, easy to operate and suitable for industrialized large-scale continuous production.

The present application relates to the field of liquid-liquid two-phase reaction, and discloses a kind of liquid-liquid two-phase reaction method, liquid-liquid two-phase reaction device and application, the method includes: in the one side of permeation medium and set up the first region containing first reactant, in the other side of permeation medium and set up the second region containing second reactant;The pressure P1 of setting the first region is less than the pressure P2 of the second region;Under the action of pressure difference between pressure P1 and pressure P2, the second reactant passes through the permeation medium, contacts the first reactant and reacts;The first reactant is the first liquid phase reactant, and the second reactant is the second liquid phase reactant.The method provided by the present application controls the suction force between the two-phase reaction zone, and then controls the reaction speed, ensures that the reactants are efficiently mixed and reacted, shortens the total reaction time, does not need to dilute the reactants by a large multiple, effectively reduces the cost of reactant materials, and improves the reaction efficiency.

The invention relates to the technical field of liquid-liquid reaction, is suitable for chemical reaction of gas generated by liquid-liquid reaction, and particularly discloses a liquid-liquid two-phase reaction device which comprises a reaction tube, a feeding tube is mounted at the top of the reaction tube, and a first reactor is arranged in the reaction tube and located below the feeding tube. Continuous reaction discs are arranged in a tube body below the first reactor in the reaction tube in a staggered manner; reaction liquid is continuously introduced into the feeding pipe, so that the reaction liquid overflows out of the first reactor and then enters the continuous reaction disc for step-by-step reaction; a gas outlet is formed in the top of the reaction tube and is used for discharging a gas product generated by reaction; and the bottom is provided with a waste liquid outlet for discharging reacted waste liquid. The number of the feed ports can be adjusted according to liquid types, and the reaction kettle is suitable for reaction of various liquids; the first reactor and the continuous reaction disc are designed in the reaction tube, so that the reaction efficiency and the product purity are improved; a waste liquid outlet is formed in the lower part of the reaction tube, so that the reaction can be continuously carried out and the experiment efficiency is improved.

The invention belongs to the technical field of organic synthesis, and particularly relates to a preparation method of a pyrrolopyrimidine-4-amine derivative, which selects methanol, ammonium formate and formic acid as a reaction system to carry out directional reaction, avoids the use of high-pressure hydrogen and a high-pressure kettle, avoids the safety risk caused by high-pressure operation, and improves the yield of the pyrrolopyrimidine-4-amine derivative. And the alcoholic solution solves the problems of low solubility and obvious amplification effect of a starting material when water is used as a solvent in the prior art, and realizes homogeneous reaction. By adopting the fixed bed reaction unit, the problem of pipeline blockage caused by sublimation of ammonium formate is solved, the potential safety hazard in large-scale production is eliminated, the fixed bed reaction unit is used for continuous catalytic reaction to replace the traditional staged reaction, the production period is remarkably shortened, the production efficiency is improved, and the method is suitable for large-scale industrial production.

The invention provides a production method of lanthanum zirconate, and belongs to the technical field of inorganic non-metallic materials. According to the invention, an electric smelting method is adopted, during high-temperature smelting, a zirconia material and lanthanum oxide / lanthanum carbonate are fully subjected to a high-temperature liquid phase chemical reaction at high temperature, an all-La2Zr2O7-phase electric smelting lanthanum zirconate product can be obtained, and the all-La2Zr2O7-phase electric smelting lanthanum zirconate product can be processed into particle size sand and fine powder with various particle sizes or can be processed into crushing and grading powder for a high-temperature thermal barrier coating material according to the requirements of users. Compared with a La2Zr2O7 material prepared by a solid-phase reaction method, a precipitation method, a sol-gel method, a self-propagating combustion method, a hydrothermal synthesis method and the like, the lanthanum zirconate prepared by the method provided by the invention is high in volume density and low in porosity, can be processed into particles and fine powder / graded powder with various particle size levels, is good in high-temperature volume stability, and can be used for preparing the lanthanum zirconate material. As an electric melting material, the material has the characteristics of small reheating shrinkage and small high-temperature creep deformation.

The application discloses a kind of experimental system and method of multistage acceleration promotion gas-liquid-solid three-phase reaction, it is related to reaction equipment and carbon emission reduction related technical field.The experimental system includes: reaction kettle, is equipped with visual window and atomizing device installation slot;Floating piezoelectric ceramic atomizing device, is embedded in atomizing device installation slot;Gas injection device, including gas hole distribution pipe and the gas injection pump connected with gas hole distribution pipe;Gas hole distribution pipe is equipped with the micropore of uniform distribution;Magnetic stirring device, including magnetic drive base, speed controller and the magnetic stirring sub of being arranged in reaction kettle;Magnetic stirring sub is arranged above gas hole distribution pipe;Support net, is arranged in the side of magnetic stirring sub away from gas hole distribution pipe;Temperature control device, including constant-temperature bath and the temperature controller for controlling constant-temperature bath temperature.The experimental system structure design is compact, modularization, easy to operate, can efficiently accelerate gas-liquid-solid three-phase reaction, applicable to a variety of experimental research.

The invention provides a catalytic cracking method for highly producing ethylene and propylene from hydrocarbons, which comprises the following steps: (1) introducing preheated raw materials and water vapor from the lower part of a reactor, contacting with a catalyst and reacting to obtain a reaction oil agent; the reactor at least comprises two reaction zones, namely a first reaction zone and a second reaction zone from bottom to top, the average solid content of a catalyst in the first reaction zone is greater than 0.2, and the average solid content of a catalyst in the second reaction zone is less than 0.1; (2) carrying out gas-solid separation on the reaction oil agent to obtain a carbon deposit catalyst and oil gas; and separating the oil gas to obtain a product comprising ethylene and propylene. In the initial stage of the reaction, a dense-phase reaction zone is adopted to increase the contact between hydrocarbon molecules and the active center of the catalyst, so that the proportion of catalytic cracking reaction is remarkably increased, and the thermal cracking reaction degree is reduced; a dilute phase reaction zone is adopted at the reaction tail end, reconversion of generated ethylene and propylene is reduced, hydrogen transfer reaction and condensation reaction are reduced, and the yield ratio of diene / (methane + coke) is greatly increased.

The invention belongs to the technical field of low-temperature solid-phase synthesis, and particularly relates to a microwave-assisted low-temperature solid-phase synthesis method and device. The microwave-assisted low-temperature solid-phase synthesis method comprises the following steps: placing a reaction cavity of a spiral gas-solid two-phase flow reactor in a microwave-assisted heating system, and applying a microwave heating field to the reaction system in the reaction cavity by adopting a microwave generator; under the condition of a microwave heating field, carrier gas and feed gas are introduced into the spiral gas-solid two-phase flow reactor by using compressed gas, and the feed gas brings materials into a reaction cavity for continuous low-temperature solid-phase synthesis reaction. The microwave-assisted heating system is used for carrying out assisted heating on the reaction system, so that the reaction time for preparing various materials is shortened, and the synthesis efficiency of the materials is improved; moreover, the mass and heat transfer efficiency in the low-temperature solid-phase reaction process is improved, the reaction time of each material is shortened, and the purity and yield of a target product are improved.

The invention discloses a carbon-supported non-noble metal high-entropy alloy oxygen reduction catalyst and a preparation method and application thereof.The method comprises the steps that an organic ligand and metal salt are placed in a ball milling tank, the metal salt is nitrate or acetate or chloride, and metal elements in the metal salt comprise at least five of iron, cobalt, nickel, manganese, copper, zinc and chromium; the ball milling tank is put into a planetary ball mill for a solid-phase reaction, and the high-entropy metal-organic coordination polymer is prepared; mixing the high-entropy metal-organic coordination polymer and carbon black, and uniformly mixing the high-entropy metal-organic coordination polymer and the carbon black by using the planetary ball mill again; the mixed material is placed in a tubular furnace for high-temperature pyrolysis, nitrogen is blown and cooled, and the carbon-supported non-noble metal high-entropy alloy oxygen reduction catalyst is prepared. The preparation method provided by the invention is universal and feasible, and has macro preparation potential; the half-wave potential of the prepared catalyst is 0.92 V which is superior to that of a commercial Pt / C catalyst which is 0.88 V, and the catalyst has good oxygen reduction electro-catalysis performance.