95results about "Liquid-liquid reaction processes" patented technology

The present invention relates to reactors and reactor components which have good resistance to NH3 and N2 and possibly to H2O at high temperatures and moderate pressures and thus can be used in industrial-scale reactions for the catalytic decomposition of NH3 into N2 and H2.

The invention belongs to a production system and a production process of sodium methoxide. Comprising a sodium methoxide reaction tower, a methine solution pipeline, a refined methanol pipeline and a sodium methoxide storage tank, the methine solution pipeline is connected with an inlet in the upper portion of the sodium methoxide reaction tower through a tube pass of a methanol reaction tower kettle liquid heat exchanger, and a liquid phase outlet in the bottom of the sodium methoxide reaction tower is connected with an inlet of a sodium methoxide reaction tower kettle liquid evaporator; a liquid phase outlet of the sodium methoxide reaction tower kettle liquid evaporator is connected with a sodium methoxide storage tank through a methanol reaction tower kettle liquid heat exchanger shell pass; the refined methanol pipeline is connected with a lower gas-phase inlet of the sodium methoxide reaction tower through a tower top heat exchanger shell pass of an amide rectifying tower in the amide production unit, and the refined methanol pipeline is connected with a lower gas-phase inlet of the sodium methoxide reaction tower through a bottom liquid heat exchanger tube pass of a methanol rectifying tower in the amide production unit; according to the thermodynamically coupled sodium methoxide-amide collaborative production system, a cross-device energy and material collaborative network is constructed, so that the double breakthrough characteristics of energy conservation and product quality improvement are realized.

The invention relates to an improved process for the manufacture of a fluorinated organic compound, wherein the process comprises a fluorination reaction of an organic precursor compound having at least one chlorine substituent and / or at least one double bond, and said organic precursor compound is reacted in liquid phase in HF (hydrogen fluoride) serving as solvent and fluorinating agent in the presence of a fluorinating catalyst, and wherein the fluorination reaction is performed in liquid phase in a SiC block chemical reactor, and wherein the reaction mixture is withdrawn from SiC block chemical reactor, and wherein the process comprises optionally isolating and / or purifying the targeted fluorinated organic compound.

The invention provides a pipeline premixer, a multi-component liquid-phase reactant pipeline premixing system and method and application of the pipeline premixer and the multi-component liquid-phase reactant pipeline premixing system and method. The pipeline premixer is used for pre-mixing multi-component liquid phase reactants and sequentially comprises a variable-pitch spiral flow guide section, a spiral flow guide section, a spiral flow guide section and a flow guide section in the fluid direction, and the variable-pitch spiral flow guide section is used for increasing the fluid Reynolds number to a turbulent flow area; the multi-taper-hole shear plate section is used for shearing fluid so as to generate a local cavitation effect; and the helical tooth staggered mixed grid section is used for enabling the fluid to generate a Karman vortex street. Compared with the prior art, the pipeline premixer, the multi-component liquid phase reactant pipeline premixing system, the method and the application have the advantages that molecular-level uniform mixing of multi-component reactants is realized by arranging the variable-pitch spiral flow guide section, the multi-taper-hole shear plate section and the helical-tooth staggered mixing grid section; therefore, the problem of non-uniform component distribution caused by mixing delay in the kettle can be solved.

The application provides a low-temperature methanol washing and urea generation combined energy-saving system and method, comprising a feed heat exchanger, a cooling separation unit, an absorption tower, a liquid phase treatment unit and a urea synthesis unit, each unit cooperatively realizing process deep integration and energy coupling; the application takes the purified reflux liquid phase CO2 as the cooling source of the cooling separation unit, without external refrigeration, reducing low-temperature methanol washing cooling source consumption, also reducing the absorption tower treatment load, reducing its energy consumption, equipment investment and CO2 emission; the product liquid phase CO2 is directly supplied to the urea synthesis after cold energy recovery through the heat exchanger, replacing the traditional CO2 gas pressurization process, eliminating the secondary energy consumption of transportation. The multi-channel heat exchanger realizes cold energy step-by-step utilization, improving the overall energy efficiency. The application realizes self-provided cold energy and efficient energy recovery, achieves CO2 resource utilization, simplifies the process and reduces the maintenance cost, and the system is economic and environmentally friendly, and is suitable for industrial application of coal chemical industry and chemical fertilizer production.

This application discloses a process and apparatus for the continuous preparation of lithium difluorooxalate borate, relating to the field of lithium salt additive preparation technology. The process mainly includes a pretreatment step, a continuous reaction step, and a spray drying step. Specifically, it includes: preparing an oxalic acid solution and dehydrating the oxalic acid solution to obtain a dehydrated oxalic acid solution with a moisture content of less than 20 ppm; continuously pumping a lithium tetrafluoroborate solution, trimethylchlorosilane, and the dehydrated oxalic acid solution into a spiral pipe reactor for reaction to obtain a lithium difluorooxalate borate reaction solution; and spray drying the lithium difluorooxalate borate reaction solution to remove organic solvents, obtaining crude lithium difluorooxalate borate. This application precisely controls the moisture content in the raw materials, enabling large-scale continuous production and effectively avoiding the problems of caking and sticking to the walls during the drying process. It also solves the problems of corrosion caused by excessive moisture and low drying efficiency in the preparation of lithium difluorooxalate borate, thus improving production efficiency and product yield.

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.

A uniform flow distribution device including a single substrate provided having flow channels connecting one inlet and a plurality of outlets. The flow channels include a flow distribution section configured to distribute a liquid introduced into the inlet of the substrate into a plurality of branch flow channels that connect to the outlets, and a flow resistance section that is located downstream of the flow distribution section and configured to provide flow resistance to each of the branch flow channels.

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 application discloses an immersed self-suction type rotating packed bed, which comprises a motor, a shell, a liquid inlet, a rotor assembly, a stator and a liquid outlet; the rotor assembly comprises a rotor, a composite filler impeller, a first rotating shaft and a second rotating shaft; the rotor is fixedly connected with the output shaft of the motor through the first rotating shaft; the second rotating shaft is coaxial with the first rotating shaft and is arranged on the opposite side of the first rotating shaft, and the top end of the second rotating shaft is rollingly sleeved with the shell; the second rotating shaft is a hollow channel structure, and the end of the liquid inlet is connected with the hollow channel of the second rotating shaft; the composite filler impeller comprises annular fillers, inner vanes and outer vanes; the inner vanes are fixedly arranged on the inner side of the annular fillers, and the outer vanes are fixedly arranged on the outer side of the annular fillers. The rotating packed bed has the mixing characteristics of the rotating packed bed and the conveying characteristics of the centrifugal pump, and as a pre-reactor, the material can reach the best mixing state before entering the main reactor.

A flow reactor that mixes a first and a second fluid, wherein the first fluid flows toward a first tip between an inner wall of a first inner tubular portion and an outer wall of a second inner tubular portion, the second fluid flows toward a second tip inside the second inner tubular portion, a third fluid having low affinity for the first and the second fluid flows toward a downstream end between an outer wall of the first inner tubular portion and an inner wall of an outer tubular portion, the second tip of the second inner tubular portion does not protrude further to the side of the downstream end than the first tip of the first inner tubular portion, and the first tip is located closer to the side of the upstream end than the downstream end when viewed from a direction orthogonal to the flow direction.

The utility model provides a production device for synthesizing TBTD in one step, which comprises a reaction kettle, a di-n-butylamine adding pipeline, a hydrogen peroxide adding pipeline, a carbon disulfide adding pipeline, a soft water adding pipeline, a carbon disulfide gas discharging pipeline and a nitrogen pipeline are arranged at the top end of the reaction kettle, and the carbon disulfide gas discharging pipeline is connected with a gas inlet of a condenser. A condensate outlet pipeline of the condenser is connected with a carbon disulfide receiving tank, a bottom outlet pipeline of the carbon disulfide receiving tank is connected with a carbon disulfide adding pipeline, and the carbon disulfide adding pipeline is further connected with a carbon disulfide transfer pump; hydrogen peroxide is adopted as an oxidizing agent, so that high-salinity wastewater discharge is reduced; the reaction liquid is washed with water for many times to remove residual alkali liquor and byproducts, water is used as a solvent to replace a traditional methanol / ethanol system, and emission of VOCs is reduced; the metering pump is used for dropwise adding materials, so that automatic sealing feeding is realized, and harm to bodies of workers is reduced; carbon disulfide is recycled for next reaction, so that the material loss is reduced, and the pollution problem in the subsequent treatment process is reduced.

The present invention relates to a method for removing impurities from nitrated crude products obtained during the nitration of nitratable aromatic compounds, after removal of the final nitrating acid, by treatment with a washing medium, and also to a plant or apparatus suitable for implementing this method. Further provided by the invention is a production plant for the nitration of nitratable aromatic compounds, with subsequent purification of the nitrated products.

This invention discloses an apparatus for producing hydrogen chloride from carbon tetrachloride, belonging to the field of hydrogen chloride process technology. It aims to solve the problem in existing technologies where the reaction of carbon tetrachloride with water produces toxic phosgene if too little water is used, and hydrogen chloride and carbon dioxide gases are produced if too much water is used. Since the boiling points of these two gases are very close at atmospheric pressure, separation is difficult. The apparatus includes a carbon tetrachloride storage tank and a pure water tank, each equipped with a heater. A first valve is installed on the carbon tetrachloride storage tank, and a second valve is installed on the pure water tank. The carbon tetrachloride storage tank is connected to a first heat exchanger, which is connected to a first gas pump. The pure water tank is connected to a second heat exchanger, which is connected to a second gas pump. The second and first gas pumps are connected to a mixing mechanism, which is connected to a tubular hydrolysis reactor. A concentrated sulfuric acid contact tower is connected to the tubular hydrolysis reactor.

The invention provides a system and a method for preparing oxalic acid by hydrolyzing dimethyl oxalate. The system comprises a pre-reaction kettle, a methanol tower, a hydrolysis tower, a methanol tower condenser, a mother liquor heat exchanger and a crystallization unit which are connected with one another through pipelines. The method comprises the following steps: feeding a mixed solution of fresh dimethyl oxalate and desalted water and a thermally coupled circulating mother solution into a pre-reaction kettle for primary hydrolysis reaction, then feeding into a methanol tower for reactive distillation, returning a tower bottom solution to a hydrolysis tower material for reactive distillation, and returning a gas phase at the top of the hydrolysis tower to the bottom of the methanol tower material for feeding, refined methanol is extracted from the top of the methanol tower, one stream of oxalic acid hydrolysate in the kettle of the hydrolysis tower is mixed with the mother liquor and enters the pre-reaction kettle, and the other stream of oxalic acid hydrolysate is thermally coupled with the mother liquor and then enters the crystallization unit to obtain refined oxalic acid. The dimethyl oxalate conversion rate is high, the methanol purity is high, the monomethyl oxalate content in the oxalic acid hydrolysate is low, oxalic acid crystallization and thermal coupling of the mother liquor and the hydrolysate are facilitated, and the overall energy consumption is reduced.

The invention provides a process for producing biographite from a biocarbon feedstock, comprising: providing a metal-containing species that is a metal carbide or is capable of forming a metal carbide; feeding a biocarbon feedstock and the metal-containing species into a molten metal carbide reactor having a first reaction zone and a second reaction zone, wherein the first reaction zone is operated at a first-zone temperature selected to achieve a molten state comprising the metal carbide, and wherein the second-zone temperature is lower than the first-zone temperature; operating the molten metal carbide reactor to dissolve carbon (from the biocarbon feedstock) in the molten state, thereby generating dissolved carbon, and to produce biographite from the dissolved carbon; recovering biographite product; and recycling a portion of the biographite to the molten metal carbide reactor. The recycled biographite functions as a graphitization template to enhance formation of biographite from the dissolved carbon.

The invention provides an application of a benzoate compound in a synthesis process of copper phthalocyanine, which comprises the following steps: S1, adding 3g of benzoate compound, 310g of 100% phthalic anhydride, 231g of urea and 1500ml of solvent alkylbenzene into a 3000ml three-neck bottle provided with a stirring device, a thermometer and a condenser, uniformly heating to 170 DEG C within 4 hours while stirring, and keeping the temperature for 2 hours; s2, 231 g of urea is added, the temperature is evenly increased to 190 DEG C within one hour, and heat preservation is conducted for 2 hours; s3, adding 61 g of 100% cuprous chloride and 4 g of 100% ammonium molybdate, uniformly heating to 210 DEG C within 5 hours, carrying out heat preservation and stirring reaction for 6 hours, and cooling to 100 DEG C; according to the application of the benzoate compound in the synthesis process of the copper phthalocyanine, a proper amount of the benzoate compound is added in the synthesis process of the copper phthalocyanine, so that the product yield is increased, the consumption of raw materials is reduced, and the emission of three wastes is reduced, and therefore, the production cost is reduced, and the pollution to the environment is reduced.

The invention relates to the technical field of coal chemical industry, and discloses a method for continuously synthesizing trisulfonated triphenylphosphine in a microreactor. The method comprises the following steps: (1) conveying a mixed solution containing sulfur trioxide and a first organic solvent from a first raw material tank (1) and a mixed solution containing triphenylphosphine and a second organic solvent from a second raw material tank (3) into a micro-mixer (5) for mixing, and then conveying the obtained mixture into a micro-reactor (6) for sulfonation reaction, and returning the reacted material in the microreactor (6) to the second raw material tank (3). According to the method for continuously synthesizing trisulfonated triphenylphosphine in the microreactor, the mixing process and the heat exchange process of reactants are enhanced by adopting a micro-mixing structure, so that the reaction efficiency can be improved, the generation of waste liquid is reduced, and the reaction cost is reduced.

The present invention provides a hydrodynamic-cavitation-based liquid-liquid reactor and a method thereof, and an apparatus. The reactor comprises a chamber A and a chamber B, wherein the chamber A is configured to convey a first fluid so as to make same rotatably enter a cavitation reaction unit in a central region; the chamber B is configured to convey a second fluid so as to make same rotatably enter the cavitation reaction unit to mix with the first fluid; and an axially adjustable flow guide member is provided in the central region to assist with drainage. The present invention achieves high-efficiency mass transfer of multiphase fluids in a controllable cavitation field by means of an innovative dual-tangential reverse feeding structure, adjustable flow guidance and Venturi coupling design, forming reaction intensification through swirling flow impingement, mixing and cavitation collapse; moreover, intelligent regulation and control of a reaction path is achieved by means of the micro-injection of gas and flow field adjustment, thus significantly improving the reaction rate, selectivity and energy efficiency ratio. Thus, the present invention has good engineering adaptability and prospects for large-scale application.

The invention discloses a low-energy-consumption solvent recovery system and process for ultra-high molecular weight polyethylene. The system comprises a polymerization reaction kettle, a slurry adiabatic flash evaporator-I, a slurry flash evaporator-II, a circulating propane compressor, a circulating propane storage tank and a dry nitrogen heater. Compared with the traditional process, the high-temperature gaseous propane at the outlet of the compressor is used for providing heat for secondary flash evaporation, afterheat of the gaseous propane is used for heating dry nitrogen and additionally increasing the yield of hot nitrogen, and further, cooling propane is used for replacing condensate water required by cooling of a traditional polymerization reaction kettle, so that the production efficiency is improved. The reaction kettle is cooled efficiently, and the temperature in the kettle is stabilized at 70-85 DEG C, so that the traditional cooling water condensation and additional energy nitrogen heating mode is replaced, the consumption of cooling circulating water is reduced by 54.28%-100%, and medium-pressure steam is completely not required to be consumed.

The present application relates to the field of propylene aldehyde preparation, in particular to a method for industrialized preparation of propylene aldehyde, which is carried out in a pry-mounted propylene aldehyde production device, comprising the following steps: S1: mixing glycerol and an ionic liquid catalyst in the mixer (3) to obtain mixed raw materials, S2: introducing the mixed raw materials into a reaction medium in a reaction container (10) through a metering pump (4) to carry out a dehydration reaction, generating a propylene aldehyde product, which is collected and stored by the propylene aldehyde collector (12). The method provided by the present application is carried out in a pry-mounted propylene aldehyde production device, parameters in the preparation process are easy to control, and the propylene aldehyde production efficiency is high, which can produce propylene aldehyde on the oilfield site that needs to treat sewage, that is, it can be used immediately after production, solving the technical problem that propylene aldehyde is difficult to apply to oilfield sewage treatment due to its extremely unstable nature, difficult storage and transportation, and realizing the industrialized application of propylene aldehyde in the field of oilfield sewage treatment.

This invention discloses a macro- and micro-combined dispersion-enhanced liquid-liquid heterogeneous hypergravity reactor device, comprising a liquid distributor I and a liquid distributor II, a macro-mixer, a shell, and rotating packing. Liquid distributor I and liquid distributor II are respectively provided with a liquid inlet I and a liquid inlet II at one end. Both liquid distributor I and liquid distributor II have internal liquid distribution branch pipes. The macro-mixer consists of a focusing tube, a baffle plate, and a mixing tube. The rotating packing is located inside the shell, and its surface has a serrated protrusion structure. The rotating packing has symmetrically arranged protrusion structures radially at the same position. This invention enhances the liquid-liquid two-phase premixing process, achieving uniform macro-mixing; further improves the micro-mixing performance of the liquid-liquid two-phase mixture; and achieves high energy utilization.

The application discloses a kind of waste oil chemical pretreatment systems, including catalyst configuration device, first esterification reactor, first separation device, second separation device, evaporation device group, cooling device and methanol separation device, one of the outlet ends of first esterification reactor is communicated with first separation device, the outlet end of first separation device is communicated with the inlet end of second separation device, the first outlet end of second separation device is communicated with one of evaporation device, the second outlet end of second separation device is communicated with another evaporation device, the outlet end of multiple evaporation devices is simultaneously communicated with cooling device, cooling device is communicated with methanol separation device again, one of the outlet ends of methanol separation device is communicated with reflux device, reflux device is communicated with first esterification reactor.The system can effectively reduce the acid value of waste oil and remove the metal, phospholipid, unsaponifiable matter and other impurities in it, the overall efficiency is high in operating process, energy consumption is small, production benefit is better.

The uniform flow dividing apparatus of the present disclosure is provided with a single substrate including a flow path connecting one introduction port and a plurality of discharge ports. The flow path includes: a flow dividing portion that divides the liquid introduced into the introduction port of the substrate into a plurality of branch flow paths connected to the discharge port; and a flow path resistance part which is located on the downstream side of the flow dividing part and applies flow path resistance to each of the branch flow paths.

The invention relates to a system (10) for providing steam in a urea production plant (100), having: - at least one first steam drum (11), which is adapted so as to receive steam at a first pressure level (D1) and to supply same to a stripper (101) for the urea synthesis; and - at least one second steam drum (12) which is connected downstream of the first steam drum (11) in the flow direction (SR) and is connected thereto in order to transfer steam condensate (DK1, DK3), the second steam drum (12) being adapted so as to contain steam (D2) and / or steam condensate (DK2) at a second lower pressure level. The system (10) also has - at least one compressor unit (13) which is connected to the second steam drum (12) and is adapted so as to increase the pressure of the steam (D2) at the second pressure level to the first higher pressure level by compressing the steam, the compressor unit (13) being connected upstream of the first steam drum (11) in the flow direction (SR); and / or - at least one heat transfer unit which is connected upstream of the at least one second steam drum (12) and is adapted so as to transfer heat to the steam condensate (DKS) from a collecting container (16) of the system (10) in such a way that steam (D2) at the second pressure level is produced for further use.

The invention provides a preparation method and device of phosphorus pentafluoride, and the preparation method comprises the following steps: 1) carrying out atomization treatment on a mixed acid solution comprising a hexafluorophosphoric acid solution and a sulfuric acid solution to obtain atomized mixed acid; and 2) carrying out a thermal cracking reaction on the atomized mixed acid to obtain phosphorus pentafluoride. The preparation method of phosphorus pentafluoride provided by the invention can improve the purity of the prepared phosphorus pentafluoride, and has the advantages of high reaction efficiency, simple process and the like.

The utility model provides a dried waste sulfuric acid concentration device of a chloromethane synthesis device. A waste sulfuric acid pipeline is connected with a sulfuric acid heat exchanger, a bottom outlet of the sulfuric acid heat exchanger is connected with a rectifying tower I, and a tower top outlet of the rectifying tower I is connected with a heat exchanger II; the heat exchanger II is connected through a return tank, the return tank and a process water pipeline are connected with an upper tower of a hydrolysis tower II, and the lower part of the upper tower of the hydrolysis tower II is connected with a heater through a pipeline and then connected with a lower tower of the hydrolysis tower II; the bottoms of the rectifying tower I and the hydrolysis tower II are connected with a sulfuric acid heat exchanger through pipelines, and concentrated sulfuric acid is recovered. The reflux tank is connected with the upper part of the rectifying tower I through a pipeline to realize partial circulation; the lower part of the upper tower of the hydrolysis tower II is connected with the heater through a pipeline and then is connected with the upper tower of the hydrolysis tower II. After part of organic matters and water are removed through an upper tower heater, the sulfuric acid in the tower kettle enters a lower tower of the hydrolysis tower and is concentrated through vacuum rectification;

A liquid-liquid two-phase reactor comprises a reactor shell, the upper portion of the reactor shell is a reactor column shell (1) with the top sealed, the lower portion of the reactor shell is a reactor cone shell (2) connected with the reactor column shell, a stirring shaft (4) is arranged at the position of a center shaft of the reactor shell, and a stirrer (5) is arranged at the lower end of the stirring shaft (4). A first liquid-phase reactant inlet (6) and a second liquid-phase reactant inlet (7) are formed in the upper part of the reactor conical shell (2), a heavy reaction product outlet (8) is formed in the bottom of the reactor conical shell (2), and a light reaction product outlet (9) is formed in the upper part of the reactor column shell (1). The reactor is simple in structure, is used for liquid-liquid two-phase reaction, and can improve the purity of a target product.

The present invention relates to a device, comprising a container defining an interior for receiving a nutritional composition, a plurality of particles within the interior of the container, and a lipase immobilized to the plurality of particles so that the nutritional composition is exposed to the lipase when the nutritional composition is received within the container, wherein the lipase is configured to hydrolyze long-chain polyunsaturated fatty acid (LC-PUFA) triglycerides within the nutritional composition, and wherein the lipase is immobilized within the container such that when the nutritional composition exits the container, the lipase remains in the container.

The invention relates to the field of organic synthesis, and particularly discloses a 2, 4-difluoroaniline continuous flow diazotization method and system.The method comprises the steps that a sulfate solution of 2, 4-difluoroaniline and a sodium nitrite aqueous solution are prepared; continuously and stably conveying the obtained sulfate solution of 2, 4-difluoroaniline and the sodium nitrite aqueous solution to a micro-mixer, and then conveying to a continuous flow reactor for diazotization reaction to obtain a 2, 4-difluorobenzene diazonium sulfate solution; monitoring the reaction condition in the reaction process, and judging the reaction endpoint; after the diazonium liquid is qualified in central control, the diazonium liquid is directly used for various reactions in the next step or low-temperature quenching storage. The method lays a good foundation for continuous flow diazotization production, industrialization and scale production, improves the conversion rate of raw materials, improves the yield of diazonium salt, stabilizes the quality of the diazonium salt, reduces the quality deviation, and is beneficial to production control of products, so that the purity is controlled to be greater than or equal to 95.0% in a continuous flow process, and the content of phenolic impurities is less than or equal to 5.0%.