302 results about "Continuous reaction" patented technology

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 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 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 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 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 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 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.

The invention relates to the technical field of titanium-doped iron phosphate preparation, and particularly discloses a process method for producing titanium-doped iron phosphate through continuous reaction, which comprises the following steps: S1, continuously adding iron-phosphorus mixed liquor, titanyl sulfate, ammonia water and hydrogen peroxide into a primary reaction kettle in a parallel flow manner, starting a delivery pump to pump the material into a secondary reaction kettle after the reaction time reaches 1 hour, reacting in the second-stage reaction kettle for 1 hour, and then outputting slurry; s2, the slurry is filtered and washed with deionized water until the conductivity of washing water is lower than 1000 [mu] s / cm, and a filter cake is obtained; s3, aging the filter cake with 0.05 mol / L dilute phosphoric acid until the color is changed from yellow to white, carrying out heat preservation for 0.5-1.5 hours, and then carrying out secondary filtering and washing until the conductivity of washing water is lower than 150 [mu] s / cm, so as to obtain an iron phosphate filter cake; and S4, drying the iron phosphate filter cake at 100-120 DEG C for 8-12 hours, and calcining at 580-620 DEG C for 3-5 hours to obtain the anhydrous iron phosphate. According to the invention, continuous reaction and continuous feeding and discharging are adopted, so that the problems of non-uniform titanium doping, large product difference and high input cost caused by the existing intermittent reaction and solid-phase preparation method are solved.

The present application belongs to the field of fine chemical industry, and relates to a method for continuously preparing methylal by using a micro-channel reaction device. The micro-channel reaction device is adjusted, a solution prepared by mixing methanol, formaldehyde and a catalyst is punched into the reaction system, and the product methylal is synthesized after micro-channel reaction; the micro-channel reaction device adopts a multi-module structure, and the connection mode and the number of modules between the modules can be assembled according to requirements. The present application has the following advantages: 1) the micro-channel reaction device is used, compared with a conventional reactor, a great breakthrough is made in technology, the reaction conditions can be accurately controlled, and a larger heat exchange area can greatly improve the mass transfer and heat transfer efficiency; 2) the on-line continuous reaction can break the intermittent operation mode of the conventional reactor, and reduce the test error caused by the intermittent operation; 3) the ionic liquid catalyst is used, the reaction conditions are mild, and a better reaction effect can be achieved.

The invention discloses a multistage Joule thermal continuous reaction device and method, the reaction device comprises a reactor and a program control module, and a plurality of graphite metal mixed electrode pairs are sequentially arranged in multistage reaction cavities of the reactor; a programmable pulse gas inlet, an inert gas inlet and an inert gas outlet are formed below the reaction cavity; a feeding module is arranged at the front end of the reaction cavity; a product collecting module is arranged at the rear end; the feeding module controls raw material powder to fall into the reaction cavity according to a set flow through an electromagnetic valve; the product collecting module is used for collecting products falling into the bin after being heated by the electrodes at all levels; in the reaction process, the electrifying parameters, the electrode spacing, the working sequence and the gas inlet mode of the pulse gas inlet of each stage of electrode are independently adjusted through program control; the Joule heat continuous reaction method adopting the reaction device provided by the invention can be switched between a'small-batch fine synthesis' mode and a'continuous large-batch synthesis' mode, so that continuous preparation with different yield and quality requirements is realized.

Provided is a synthesis method for azoxystrobin, comprising: in a water-oil system of an organic solvent and an aqueous solution of trimethylamine, a compound represented by formula I reacts with 2-cyanophenol to obtain azoxystrobin, wherein the molar ratio of the compound represented by formula I to trimethylamine is 1:(0.96-2). The synthesis method has high reaction efficiency, does not produce CO2, avoids the risks of entrainment and overflow, reduces the generation of side reactions and solid waste emissions and is environmentally friendly. In addition, the method does not require the use of solid sodium carbonate or potassium carbonate, and the material reaction system is an oil-water reaction system, so that the reaction efficiency is greatly improved, and the yield can also be maintained at 95% or more, thereby taking both the efficiency (timeliness) and the yield into account and easily achieving continuous reaction, and thus providing technical support for intelligent and unmanned production. Moreover, since trimethylamine can be recycled, the use of one raw material is reduced, and further there is no need for complicated treatment for mixed salts and waste water thereof, thereby significantly reducing the energy consumption.

The invention provides a low-platinum catalyst, a preparation method and application of the low-platinum catalyst in water electrolysis hydrogen production. Dispersing melamine and cyanuric acid in a certain proportion in absolute ethyl alcohol, adding the transition metal precursor solution, continuously stirring, heating, continuously reacting, cleaning, filtering, drying and grinding to obtain first solid powder; the first solid powder is placed in inert gas for carbonization treatment, and second solid powder is obtained; and dispersing the second solid powder in deionized water dissolved with a noble metal precursor, stirring for reaction, cleaning, filtering and drying to obtain the low-platinum catalyst. And the content of Pt in the catalyst is 0.1-10 wt%. The prepared low-platinum catalyst has excellent hydrogen evolution performance, the usage amount of precious metal can be effectively reduced, and the utilization efficiency of the precious metal is improved; the preparation method is simple in preparation procedure and relatively low in cost, can realize batch preparation, and has excellent market value and economic value.

This invention belongs to the field of lithium-ion battery electrolyte material preparation technology, and provides a solid lithium hexafluorophosphate with low fine crystal content and its preparation method. The preparation method involves adding lithium fluoride to anhydrous hydrogen fluoride to form anhydrous hydrogen fluoride slurry. A portion of the anhydrous hydrogen fluoride slurry and phosphorus pentafluoride gas are fed into a primary continuous reaction crystallizer. The resulting slurry is subjected to low-temperature fractionation to form a first stream and a second stream. The second stream enters a secondary continuous growth crystallizer and continues to react with phosphorus pentafluoride gas, followed by solid-liquid separation to obtain a solid wet product and mother liquor. The first stream, another portion of the anhydrous hydrogen fluoride slurry, and a portion of the mother liquor enter a pre-conditioning section, and the resulting pre-conditioned stream is returned to the feed end of the primary continuous reaction crystallizer. The solid wet product is then subjected to low-temperature washing and programmed vacuum drying to obtain the final product. This method, through the combination of fractional reflux, mother liquor participation in pre-conditioning, and continuous growth processes, reduces fine crystal entrainment and improves particle size distribution stability.

The invention provides a novel crystalline porous organic salt membrane as well as a preparation method and application thereof, and belongs to the technical field of membrane separation. The preparation method of the crystalline porous organic salt film comprises the following steps: adding a PAN film into a NaOH solution for reaction, washing a reaction product, adding the reaction product into an HCl solution for continuous reaction, and washing again to obtain a PAA substrate; the method comprises the following steps: adding a crystalline porous organic salt solid into absolute methanol, then adding ammonia water, carrying out ultrasonic treatment to obtain a solution A, and adding the solution A onto a PAA substrate to obtain the crystalline porous organic salt film. The crystalline porous organic salt membrane provided by the invention is simple in preparation method and low in cost, also has the advantages of high permeation flux and good stability, can efficiently separate water and ethanol, and has excellent selectivity.

This invention discloses a method for preparing tert-butyl benzoate peroxide using a microchannel reactor, comprising the following steps: adding liquid alkali to tert-butyl hydroperoxide, allowing it to stand and separate into layers, and obtaining the lower sodium salt; passing the obtained sodium salt into the microchannel reactor, simultaneously passing benzoyl chloride into the microchannel reactor for mixing and reaction; passing the material emanating from the microchannel reactor into an RTB reactor for incubation and reaction to obtain crude tert-butyl benzoate peroxide; purifying the crude tert-butyl benzoate peroxide to obtain tert-butyl benzoate peroxide. This invention employs continuous feeding and achieves the synthesis reaction through a microchannel reactor, reducing the reaction time from several hours to tens of seconds to several minutes, significantly improving reaction efficiency. The entire reaction process in the microchannel reactor used in this invention is a continuous reaction, which is safe and environmentally friendly, has high production efficiency, requires a small equipment footprint, is simple to operate, reduces manual operation, and lowers production costs.

The invention relates to a method for continuously preparing alkyl diaryl phosphonate, which comprises the following steps of: a, reacting trialkyl phosphite and triaryl phosphite in a high-temperature section filled with a solid catalyst to obtain a reaction product; and b, removing low-fraction byproducts in the reaction product in the step a through reduced pressure distillation or fractionation at the outlet of the high-temperature section, feeding the residual product into a cooling section, collecting a crude product of the alkyl diaryl phosphonate at the outlet of the cooling section, and carrying out post-treatment to obtain the alkyl diaryl phosphonate. A continuous catalytic reaction is carried out through the solid catalyst filled in the tubular reactor, and an intermittent reaction is changed into a continuous reaction, so that the liquid holdup is greatly reduced, and the safety coefficient of production is improved; a traditional halogenated alkane catalyst is not used, so that the risk that the temperature rise is out of control is effectively reduced; according to the method, the reaction time is shortened while the reaction yield is not reduced, and the production efficiency is improved.

This invention relates to a continuous ferric phosphate reaction and washing system, comprising multi-stage ferric phosphate reaction and washing modules. Each stage of the ferric phosphate reaction and washing module includes a reaction device, an aging device, and a multi-stage membrane washing device connected sequentially along the feed direction. Between adjacent ferric phosphate reaction and washing modules, the multi-stage membrane washing device of the previous stage is connected to the reaction device of the next stage. This invention employs a specially designed reaction device to achieve uniform distribution and continuous reaction of the reaction raw materials, utilizes the aging device to achieve continuous aging of the slurry, and achieves continuous and efficient washing of ferric phosphate powder through the multi-stage membrane washing device. This eliminates the traditional pulping process, reduces washing energy and water consumption, achieves zero loss of phosphoric acid, and improves product quality and stability.

The application relates to the technical field of agricultural analysis and detection, and discloses a multi-union type fertilizer synergist urease activity automatic detection and analysis system, which comprises a physical execution layer and an intelligent control layer. The physical execution layer is configured with a reaction generation module, a gas transmission and conditioning module and a detection and regeneration module which are connected in sequence in a gas path, is used for constructing a closed loop flow path and executing ammonia gas absorption and titration. The intelligent control layer controls the gas transmission and conditioning module to switch the gas path according to an adaptive time sequence, constructs an intermittent absorption environment, executes static titration and resets trace acid liquid under the condition of maintaining a bypass state, and simultaneously uses system lag parameters to perform dynamic deconvolution reconstruction on discrete titration data collected, so as to restore a continuous reaction rate curve. Through the combination of hardware time sequence control and algorithm correction, the application eliminates the influence of physical transmission delay on the signal phase, and improves the detection precision and efficiency of the dynamic change of urease activity.