650 results about "Tube reactor" patented technology

The invention relates to the technical field of guanidine nitrate preparation, in particular to a method for preparing guanidine nitrate by a continuous dynamic tubular reaction process, which comprises the following steps: uniformly mixing dicyandiamide, target ammonium nitrate and target ammonium carbonate according to a mass ratio of 1: (1-3): (1-0.5); conveying the uniformly mixed material to a feeding section in a dynamic tubular reactor through a first conveying screw rod for mixing treatment, wherein the dynamic tubular reactor further comprises a heating section, a reaction section and a cooling section; sequentially conveying the target mixed material to a heating section for heating melting treatment, a reaction section for synthesis reaction treatment and a cooling section for cooling forming treatment through a second conveying screw rod to obtain an initial product; conveying the initial product into a cooling and crushing device for cooling and slicing to obtain a target guanidine nitrate product. According to the method disclosed by the invention, the mass and heat transfer efficiency can be improved, the online quantity and liquid holdup of the material are reduced, meanwhile, the raw material ratio and the reaction path are optimized, and the safety and the product purity are improved.

The invention discloses a rapid tubular induced crystallization reaction process and device for fluorine-containing wastewater, the device comprises a tubular reactor, a crystal sedimentation tank and crystal dehydration equipment, the fluorine-containing wastewater is pumped from a water inlet at one end of the tubular reactor, calcium liquid is pumped from dosing ports at intervals on the tubular reactor along the flowing direction of the wastewater at a set flow rate, and the calcium liquid is pumped from the dosing ports at intervals along the flowing direction of the wastewater; the fluorine-containing wastewater reacts with a calcium agent in the tubular reactor to generate calcium fluoride crystals with the particle size range of 10-80 microns, a mixture is discharged into a crystal sedimentation tank through a water outlet in the other end of the tubular reactor, clear water is discharged from a water outlet in the upper portion of the crystal sedimentation tank, and crystal slurry sinking to the bottom of the crystal sedimentation tank is pumped into a cyclone separator through a crystal discharging pump; large-particle crystals discharged from an outlet in the lower end of the cyclone separator are collected by a crystal collection pool and are regularly discharged into crystal dehydration equipment for dehydration, small-particle crystals discharged from an outlet in the upper end of the cyclone separator flow back to the water inlet end of the tubular reactor, the reactor is small in size and low in investment, and the stability of the calcium fluoride crystal product quality is guaranteed.

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

The invention relates to an interfacial polycondensation tubular reactor for preparing polycarbonate, which is characterized in that a U-shaped structure is adopted, a spiral turbulent flow device is arranged in a straight pipe section, and a high-viscosity melt is disturbed, laminar flow is eliminated and mixing is enhanced in an active or passive mode; a multi-stage independent temperature control module is arranged outside, so that the temperature of each reaction section is accurately regulated and controlled. The inlet, the outlet and the temperature control interface of the reactor adopt high-temperature-resistant and corrosion-resistant sealing design, and U-shaped modular flange connection is convenient for disassembly, assembly, cleaning and continuous expansion. The design solves the problems of non-uniform heat transfer and material residue of a traditional horizontal disc reactor, poor flow distribution of a tubular reactor and the like, and has the following advantages: the melt flow uniformity is improved, and local overheating and excessive polycondensation are avoided; the reaction efficiency and molecular weight distribution are optimized through segmented temperature control; the structure is compact without dead angles, the side reaction and inner wall corrosion risks are reduced, and the device is suitable for efficient continuous synthesis of polycarbonate.

The invention discloses a high-purity fluorobenzene recovery process in 1, 4-bis (4-fluorobenzoyl) benzene production, and belongs to the technical field of organic waste liquid recovery, the process comprises the following steps: 1, enabling fluorobenzene waste liquid to pass through a tubular reactor filled with anhydrous aluminum chloride particles to react to obtain dewatered fluorobenzene waste liquid, the reaction temperature is 5-40 DEG C, the retention time is 60-200min, and the flow velocity of the fluorobenzene waste liquid is 0.1-0.4 m / min; 2, the water-removed fluorobenzene waste liquid is filtered through a micron filter and then enters a fluorobenzene rectifying tower to be rectified, organic steam on the tower top is compressed through a compressor, subjected to heat exchange through an MVR heat exchanger and condensed and then enters a reflux tank to be refluxed, high-purity fluorobenzene is extracted from the fluorobenzene rectifying tower, the purity of the fluorobenzene is larger than 99.99 wt%, and the mass content of water is smaller than 10 ppm. The fluorobenzene waste liquid in the production process of 1, 4-bis (4-fluorobenzoyl) benzene is used as a raw material, continuous batch production of high-purity fluorobenzene is achieved through reaction dehydration, crystalline aluminum chloride filtration and rectification, the process is simple, and energy consumption is low.

The invention provides a method and a system for performing exothermic reaction by using a tubular reactor. The method comprises the following steps: S1, carrying out an exothermic reaction on a part of a reaction raw material A and a reaction raw material B in tubes of a tubular reactor to obtain a reaction product C; s2, enabling the other part of the reaction raw material A to enter a shell pass of a tubular reactor to perform first heat exchange with the reaction product C; according to the method and the system, the energy consumption required by the exothermic reaction can be greatly reduced, the cost is saved, meanwhile, the heat exchange effect at the blind area of the baffle plate can be improved, the temperature runaway phenomenon in the tube nest is avoided, and the safety and the stability of the exothermic reaction are greatly improved.

The invention discloses a U-shaped wall tubular reactor and an application method thereof. The reactor comprises a shell, the top of the shell is provided with a synthesis gas inlet, the bottom of the shell is provided with a synthesis gas outlet, the shell is internally provided with a gas distributor, a central gas collection cylinder and a water-cooling bundling pipe, and the outer side of the shell is provided with an upper annular cavity and a lower annular cavity; the gas distributor is arranged in the synthesis gas inlet, the central gas collection cylinder is arranged at the central part of the shell, and the water-cooling bundling pipe is arranged on the outer side of the central gas collection cylinder and consists of a plurality of U-shaped heat exchange pipes; the upper ends of all the U-shaped heat exchange tubes penetrate through the upper tube plate to be communicated with the upper annular cavity, the lower ends of all the U-shaped heat exchange tubes penetrate through the lower tube plate to be communicated with the lower annular cavity, and the upper tube plate and the lower tube plate are both arranged on the side wall of the shell. The welding seam of the heat exchange tube is not in contact with process gas, so that the corrosion problem is thoroughly solved; no internal part structure is arranged in the shell, so that the uniform distribution of reaction gas in a catalyst bed layer is improved, and the ammonia synthesis efficiency is improved. The reactor can be used for fixed bed ammonia synthesis reaction or water gas shift reaction.

The invention discloses a hexamethyldisiloxane preparation method capable of purifying a raw material, and relates to the technical field of chemical preparation, the hexamethyldisiloxane preparation method capable of purifying the raw material comprises the following steps: S1, raw material preparation: cooling deionized water through a cooling system, and maintaining the temperature to be less than or equal to 10 DEG C, then injecting part of the cooled deionized water into a tubular reactor, pumping trimethylchlorosilane and methylbenzene into a premixing tank according to a proportion, and uniformly stirring and mixing; s2, catalytic promotion: injecting diluted hydrochloric acid into the tubular reactor, uniformly mixing the diluted hydrochloric acid with deionized water, and maintaining the pH value to 2-3; according to the hexamethyldisiloxane preparation method capable of purifying the raw materials, redundant steps such as catalyst recovery and repeated washing can be omitted through the hydrolysis reaction, the method is suitable for continuous production, meanwhile, the process of the hydrolysis reaction is optimized by changing the use steps and the input method of the deionized water, and the stability in the preparation process is further maintained.

The utility model belongs to the technical field of ethylene glycol preparation, and particularly relates to an esterification purge gas treatment device in a process of preparing ethylene glycol from synthesis gas, which comprises an MN recovery tower, a gas mixer, a tail gas heater, a tail gas reactor, a cooler and a tail gas absorption tower, tower top outlet gas of the MN recovery tower and purge gas from PSA desorption gas of a hydrogenation unit enter a gas mixer, are mixed in the gas mixer, then enter a tail gas heater to be heated and then enter a tail gas reactor to react, an outlet of the tail gas reactor is connected with an inlet of a cooler, an outlet of the cooler is connected with a tail gas absorption tower, and an outlet of the tail gas absorption tower is connected with an outlet of the MN recovery tower. The tail gas absorption tower is connected with a spray water inlet pipe and a waste gas discharge pipe; and the tail gas reactor is a fixed tubular reactor. According to the device, nitrogen oxide which cannot be directly discharged in esterification purge gas can react to generate harmless gas such as nitrogen and nitrogen dioxide, environmental pollution is avoided, the device can adapt to the shutdown working condition of an esterification system, air does not need to be supplemented to the MN recovery tower, and the technological operation risk is reduced.

The tubular reactor provided by the invention comprises a reactor body, the tube body assembly is located in the reactor body and comprises a tube nest and a sleeve which are arranged in a matched mode, the tube nest is used for installing an oxygen carrier, the sleeve is arranged on the tube nest in a sleeving mode, and open holes are formed in the tube nest; the sealing assembly comprises a first sealing structure and a second sealing structure; the first sealing structure and the second sealing structure are arranged in the reactor body and are in sealing connection with the inner side wall of the corresponding position of the reactor body; the tube nest and the sleeve respectively penetrate through the first sealing structure and the second sealing structure; a gas inlet and a gas outlet are respectively formed in two ends of the reactor body, two ends of the tube nest are respectively communicated with the gas inlet and the gas outlet, and the top end of the sleeve is communicated with the gas outlet device; a liquid inlet and a liquid outlet are further formed in the side surfaces of the two ends of the reactor body and are positioned between the first sealing structure and the second sealing structure. The direct heat exchange between a coolant and an oxygen carrier can be avoided, so that the influence on the temperature of the oxygen carrier is reduced.

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 single-walled carbon nanotube collecting device, which relates to the related technical field of carbon nanotube preparation, is used for collecting single-walled carbon nanotubes entering a deposition area of a tubular reactor, and comprises a collecting net arranged in the deposition area of the tubular reactor, the sealing flange close to the deposition area of the tubular reactor is connected with the end part of the tubular reactor in a screw joint manner, the collecting net is mounted on the sealing flange, a sealing ring is mounted at the axial end part of the sealing flange, and a first abutting surface is arranged in the tubular reactor; in the stroke that the sealing flange is inserted into the tubular reactor and rotates, the end of the sealing flange is matched with the first abutting face to extrude the sealing ring to generate elastic deformation, and the sealing ring subjected to elastic deformation is attached to the collecting net.

The invention belongs to the field of chemical engineering, and relates to a process device and method for continuously synthesizing glycidyl (3-chloro-1, 2-propylene glycol and sodium hydroxide (hereinafter referred to as NaOH) as raw materials). The device comprises a raw material feeding pump, a heat exchanger, a micro-reactor, a delay tube reactor 1, a neutralization micro-reactor and a delay tube reactor 2 which are sequentially in fluid communication through pipelines, the heat exchangers are divided into two groups, one group is used for heat exchange of 3-chloro-1, 2-propylene glycol solution, and the other group is used for heat exchange of alkaline solution. According to the method, a 3-chloro-1, 2-propylene glycol solution and a sodium hydroxide solution (NaOH) are adopted as raw materials, glycidol is continuously prepared through a microchannel reactor, on the basis, an acid-base neutralization reaction can be carried out in situ according to needs to remove redundant alkali, redundant heat generated by the acid-base neutralization reaction is absorbed through a low-temperature material, and energy consumption is reduced; the product is analyzed by gas chromatography, and the generated glycidol does not have hydrolysates or auto-polymerization products, so that the product selectivity is higher.

The invention relates to a supporting and fixing structure of a long-furnace-tube reactor, belongs to the technical field of waste resource recycling, and solves the problem that a long-furnace-tube reactor in the prior art is prone to permanent deformation in the axial direction and the radial direction. A supporting and fixing structure of a long-furnace-tube reactor comprises a supporting frame arranged outside a furnace tube of the long-furnace-tube reactor in a sleeving mode, one end of the furnace tube is fixedly connected with the supporting frame, and the other end of the furnace tube is a free end capable of axially sliding; the supporting and fixing structure further comprises a sliding supporting unit arranged on the supporting frame on the lower side of the free end of the furnace tube and a sliding hanging unit arranged in the middle of the furnace tube. The sliding supporting unit is of a bearing structure capable of sliding in the axial direction and allows the furnace tube to generate axial displacement when the furnace tube is heated and expanded. And the sliding hanging unit allows the furnace tube to generate axial and radial composite displacement when the furnace tube is heated and expanded. And furnace tube deformation under the high-temperature working condition is avoided.

The application discloses a kind of water-soluble sulphur-based compound fertilizer preparation method, belong to compound fertilizer technical field.The steps include as follows:(1) in reaction kettle, concentrated sulfuric acid and potassium chloride are reacted under heating condition, reaction temperature is 105-115 DEG C, reaction time is 25-45 minutes, slurry is sent to cooling kettle;(2) in cooling kettle, temperature is reduced to 40-60 DEG C, slurry is sent to mixed acid tank;(3) in mixed acid tank, add dilute phosphoric acid, potassium bisulfate solution and slurry, reaction temperature is 65-75 DEG C, slurry is sent to tubular reactor;(4) in tubular reactor, add ammonia, washing liquid and slurry, reaction temperature is 150-180 DEG C, slurry is sent to granulator;(5) in granulator, add alkaline compound fertilizer raw material, return material and slurry for granulation, granulation temperature is 80-95 DEG C, return material ratio is 1:1.5-2.0;(6) the granules obtained from granulator are cooled and screened to obtain product.

The invention relates to a transmission shaft of a long furnace tube reactor, belongs to the technical field of waste resource recycling, and solves the problem of poor high temperature resistance of an internal transmission shaft of the long furnace tube reactor in the prior art. A transmission shaft of a long furnace tube reactor is of an inner-outer double-tube structure and comprises an inner tube and an outer tube, one ends of the inner tube and the outer tube are fixedly connected, and the other ends of the inner tube and the outer tube are slidably connected through a guide supporting ring. And stable operation of the long-furnace-tube reactor under the high-temperature working condition is realized.

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 invention relates to a photocatalytic wastewater treatment device which is characterized in that the photocatalytic wastewater treatment device comprises a multi-section cross flow mixing pipeline, an ultrasonic tank and a photocatalytic reactor, and the photocatalytic reactor is composed of a tubular reactor provided with an ultraviolet lamp and a baffle embedded in the tubular reactor; wherein the cross-flow mixing pipelines are distributed in a tree shape, each cross-flow mixing pipeline comprises a water inlet main pipeline, a branch pipe and a water outlet main pipeline, wastewater enters from the water inlet main pipeline and enters the branch pipes through multi-stage shunting, and materials in the branch pipes enter the water outlet main pipelines through multi-stage cross convergence and enter the adjacent cross-flow mixing pipelines. The thought of combining the micro-channel reactor and the Tesla valve is adopted, a liquid-liquid or gas-liquid mixture is subjected to multi-stage shunting and then converged, materials can be effectively promoted to be uniformly mixed, and the design can meet various mixing requirements of liquid-liquid mixing, liquid-gas mixing and liquid-liquid-gas mixing.

The invention provides a continuous synthesis system of gamma-chloropropyltrichlorosilane. The continuous synthesis system comprises a trichlorosilane storage tank, a chloropropene storage tank, a catalyst storage tank, a static mixer, an n-stage series tubular reaction system and a rectification device, the tubular reaction system comprises a tubular reactor, a back pressure valve, a degassing device and a condenser; a liquid phase outlet of the degassing device and a liquid phase outlet of the condenser are connected with a next-stage tubular reactor; the trichlorosilane storage tank, the chloropropene storage tank and the catalyst storage tank are respectively connected with an inlet of the static mixer, and an outlet of the static mixer is connected with the first-stage tubular reactor; the inlet feed of the second to nth stages of tubular reactors comprises chloropropene; a liquid phase outlet of the nth-stage degassing device is connected with an inlet of the rectification device, and the rectification device is connected back to the first-stage tubular reactor and outputs a gamma-chloropropyltrichlorosilane product. The reaction efficiency and the conversion rate are improved, and the production energy consumption and the cost are low. The invention further provides a synthesis method based on the system, and the technological process is simple.

The invention provides an ammonia gas synthesis method based on an osmium-platinum catalyst and nitrogen oxide, and solves the technical problem of high production cost caused by high price of a catalyst used for hydrogen reduction of nitrogen oxide in the prior art. The method comprises the following steps: respectively preparing NO, H2 and inert gas according to preset requirements; weighing an osmium-platinum catalyst, and adding the osmium-platinum catalyst into the tubular reactor containing the quartz wool; h2 is introduced into the tubular reactor, the reactor is heated to 200-400 DEG C, the osmium-platinum catalyst is pretreated at the temperature, and then the osmium-platinum catalyst continues to be cooled to the room temperature under purging of H2; meanwhile, NO, H2 and inert gas are introduced into the reactor to form mixed gas, the temperature in the tubular reactor is raised to a preset temperature, then heat preservation is conducted, the mixed gas reacts under the action of the osmium-platinum catalyst, and then ammonia gas can be synthesized. The method has lower energy consumption and higher yield, and the used catalyst is lower in cost and better in performance.

The utility model discloses a gas-liquid separation tubular reactor, which belongs to the technical field of reactors and comprises an inner cylinder with two ends plugged and transversely arranged, an outer cylinder is coaxially arranged outside the inner cylinder, and an annular space between the inner cylinder and the outer cylinder is of a plugged structure; a stirrer is arranged in the inner cylinder body; a gas-liquid separation tank which upwards penetrates out of the outer barrel in the vertical direction is arranged on the inner barrel, a defoaming device is arranged in the gas-liquid separation tank, and a gas phase outlet is formed in the top end of the gas-liquid separation tank; a feeding hole is formed in one axial end of the inner cylinder body, and a discharging hole is formed in the other axial end of the inner cylinder body; a heat exchange medium inlet is formed in one axial end of the outer cylinder, and a heat exchange medium outlet is formed in the other axial end. According to the utility model, the gas-liquid separation tank and the gas phase buffer tank are arranged on the inner cylinder body, so that a gas storage buffer space is provided for generated gas, and the liquid holdup in the inner cylinder body and the retention time of materials are ensured.

The utility model relates to a liquefied natural gas storage tank precooling mixed gas separation device in the technical field of gas separation. The liquefied natural gas storage tank precooling mixed gas separation device comprises a gas-liquid conveying system, a hydrate generation system, a cooling heat exchange system, a hydrate decomposition system, a separation and collection system and a data monitoring and collection system. The nano-bubble generator and the folded tubular reactor work cooperatively, nano-bubbles can be kept stable in a liquid carrier for a long time, high suction capacity and high generation efficiency can be guaranteed, natural gas and nitrogen mixed gas generated in the precooling process of the LNG storage tank is recycled at high efficiency and low cost, energy input is reduced, cost is reduced, and the production efficiency is improved. The resource waste is reduced, and the environmental pollution is reduced.

The invention relates to the technical field of tubular reactors, in particular to a continuous flow tubular reactor which comprises a shell, a plurality of baffle plates and a plurality of medium tubes. A spiral flow channel is defined between the multiple baffle plates and the shell, the medium pipe is arranged on the baffle plates in a penetrating mode through multiple first elastic pieces, the multiple first elastic pieces are evenly distributed in the circumferential direction of the medium pipe, and the first elastic pieces are spiral. According to the continuous flow tubular reactor disclosed by the invention, the flowing path of reactants is changed by utilizing autorotation and axial movement of the baffle plates, the position of a dead zone is continuously replaced, the reactants are prevented from being always accumulated in one zone, and the reaction efficiency is improved; along with the rotation and movement of the baffle plate, when the reactants pass through the space between the medium pipe and the baffle plate, the first elastic sheet generates axial turbulent flow on the reactants passing through the space between the medium pipe and the baffle plate, so that the flow resistance is increased, the probability of insufficient reaction of the reactants is reduced, and the reaction stability is improved.

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

The invention belongs to the technical field of production processes of chemical products, and relates to a device and a method for continuously preparing 2-acrylamido-2-methylpropanesulfonic acid. The annular pipeline reaction system comprises a crystallization reactor, a tubular reactor group and a mother liquor internal circulation pipeline which form an annular passage; the solid-liquid separation refining system comprises a solid-liquid separation device, a reduced pressure distillation device, a product refining device, a drying device and a heat exchanger; the external circulation and feeding system comprises a mother liquor external circulation pipeline, an isobutene feeding pipeline, a sulfuric acid feeding pipeline, an acrylonitrile feeding pipeline and an acrylonitrile reflux pipeline; the acrylonitrile feeding pipeline is divided into three branches, one branch is connected with the crystallization reactor, one branch is converged with the isobutene feeding pipeline, the mother liquor external circulation pipeline and the acrylonitrile backflow pipeline to be connected with an isobutene feeding port, and the other branch is converged with the sulfuric acid feeding pipeline, the mother liquor external circulation pipeline and the acrylonitrile backflow pipeline to be connected with a sulfuric acid feeding port. According to the invention, the production efficiency is improved, and the yield and purity of the product are higher.

The present disclosure addresses the problem of providing a moving device for a multi-tubular reactor having a closing part on a tube plate surface, said moving device being capable of maintaining a substantially horizontal state with respect to the tube plate surface without falling over. A moving device 300 comprises: a frame part 350; and a movement propulsion part which is capable of moving on a tube plate in a state of having the frame part 350 mounted thereon. The movement propulsion part has three or more insertion members 323 which can be inserted into reaction tubes 4 that are mutually different, and an insertion member removal / insertion mechanism that removes / inserts the insertion members from / into opening parts 4a of the reaction tubes. The insertion member removal / insertion mechanism can move the insertion members in a direction substantially perpendicular to a tube plate surface 3a, and has an insertion member height adjustment mechanism which maintains a substantially horizontal state of the moving device when at least one of the three or more insertion members comes into contact with a closing part. Due to this configuration, the above problem is solved.

The invention relates to a biodegradable continuous tubular reactor, the wall of which comprises at least one cylindrical layer based on a polyanionic compound chelated by an at least divalent cation, and the central space of which comprises a cross-linkable fluid free of polyanionic compound.

The invention discloses a method and system for continuously synthesizing 2, 4-dichloroacetophenone, and the method for continuously synthesizing 2, 4-dichloroacetophenone comprises the following steps: S1, mixing m-dichlorobenzene and a catalyst to form a turbid liquid, and continuously inputting the turbid liquid into a tubular reactor; s2, enabling gas-phase acetyl chloride to pass through a micro-interface generator to form micron-sized microbubbles, continuously inputting the micron-sized microbubbles into a tubular reactor, and carrying out mixed reaction on the micron-sized microbubbles and the turbid liquid to obtain a mixed reaction liquid; and S3, continuously inputting the mixed reaction liquid and water into a hydrolysis reactor, and carrying out hydrolysis and separation to obtain 2, 4-dichloroacetophenone. According to the invention, the traditional kettle type stirring reaction is changed into micro-interface reaction, and the mass transfer area and the total mass transfer rate among multiple phases can be multiplied, so that the reaction rate is greatly improved, the side reaction is effectively controlled, and meanwhile, the product yield, the reaction safety and the like are improved.

The invention belongs to the technical field of industrial waste salt treatment, and discloses a solar tower type heat collection industrial waste salt organic impurity pyrolytic reaction system. Comprising a salt storage tank, a rotary flow divider, a flow dividing pipeline, a salt collecting box, a flow guide device, a gradual change type square tube reactor, a V-shaped flow guide device, a salt collecting tank, a heliostat field, a tail gas exhaust pipe, a cyclone separator, a tail gas purification device, an electric valve and the like, and a heat collection-reaction integrated semi-continuous treatment system is constructed. According to the system, a gradual change type square tube reactor and a rotary flow divider are adopted to dynamically adapt to solar Gaussian heat flow, unpowered fluidized conveying of waste salt is achieved depending on gravity driving, feeding and waste gas interference is avoided through batch filling, independent pyrolysis and reverse exhaust, stable operation under complex working conditions is guaranteed through heat flow-material dynamic adaptive regulation, and the system is suitable for large-scale industrial production. The industrial waste salt organic impurity pyrolysis, organic impurity removal and recovery and tail gas up-to-standard emission are efficiently achieved, and the method has energy conservation and environmental protection properties and is suitable for large-scale industrial waste salt harmless treatment and resource recovery.

The invention belongs to the technical field of synthesis of organic compounds, and particularly relates to a process for preparing fipronil and an intermediate thereof. Toxic 1, 2-dichloroethane is comprehensively replaced by bio-based gamma-valerolactone, low-toxicity cyclopentyl methyl ether is matched, and N, N-dimethylformamide necessary for the process is recycled, so that consumption is greatly reduced; the continuous processes of amination, diazotization and the like are realized through a tubular reactor, a micro-reactor and a static mixer, and separation technologies such as pervaporation membrane and vacuum distillation are combined, so that the reaction time is shortened, the solvent recovery rate is increased, and the production is promoted to be continuously transformed to green. The supported FeCl3 / SiO2-NH2 catalyst disclosed by the invention can be repeatedly used, and byproducts and tail gas can be recycled and reused. In addition, diazonium salt residues are controlled to be smaller than or equal to 0.5% through near infrared spectroscopy, citric acid is subjected to stable oxidation reaction, a purification process is combined, it is ensured that the finished product is high in purity, excellent in yield and small in batch fluctuation, and efficiency and safety are both considered.