355 results about "Tube reactor" patented technology

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 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 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 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 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 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.

The present application relates to the technical field of alcohol aldehyde condensation reaction, and discloses an alcohol aldehyde condensation reaction method.The alcohol aldehyde condensation reaction method is carried out in an alcohol aldehyde condensation reaction device, the alcohol aldehyde condensation reaction device comprises a micro-channel alcohol aldehyde condensation reactor and an alcohol aldehyde condensation tube reactor which are connected in series; in the presence of an alkali catalyst, a reaction raw material n-butyl aldehyde is subjected to a first alcohol aldehyde condensation reaction in the micro-channel alcohol aldehyde condensation reactor to obtain a first alcohol aldehyde condensation reaction product; and the first alcohol aldehyde condensation reaction product is subjected to a second alcohol aldehyde condensation reaction in the alcohol aldehyde condensation tube reactor.The method uses a micro-channel alcohol aldehyde condensation reactor and an alcohol aldehyde condensation tube reactor to replace a full-mixing kettle reactor in the prior art to carry out alcohol aldehyde condensation reaction, so that the yield of a by-product heavy carbon alcohol can be significantly reduced, and the yield of a target product can be improved.

This invention discloses a cationic etherifying agent and its preparation method, belonging to the field of cationic etherifying agent production technology. The preparation method includes: continuously feeding trimethylamine and hydrochloric acid into a raw material pretreatment unit, pre-cooling to -10~20℃; entering a first tubular reactor, reacting at -10℃~20℃ and 0.15MPa for 10~60 minutes to generate trimethylammonium chloride; trimethylammonium chloride and epichlorohydrin entering a static mixer, simultaneously adding a catalyst and an organic amine; entering a second tubular reactor, reacting at 10~50℃ and 0.2MPa for 1~3 hours; during the reaction, monitoring the chloride ion concentration and epichlorohydrin residue in real time, dynamically adjusting the reaction parameters; filtering the reaction product through a nanofiltration membrane to obtain a high-purity cationic etherifying agent. This invention employs a continuous tubular reaction process combined with automatic control and nanofiltration membrane separation, resulting in a short production cycle, low energy consumption, few by-products, and a high-purity, odorless product, showing good industrial application prospects.

The invention provides a production system for preparing two-dimensional aromatic polyamide based on a liquid-phase loop tube, and relates to the technical field of two-dimensional aromatic polyamide production, and the production system comprises a loop tube core reaction module used for carrying out a two-dimensional aromatic polyamide polycondensation reaction through a loop tube reactor; the intelligent regulation and control module is used for monitoring operation parameters of the ring pipe core reaction module in real time and generating a reaction parameter regulation and control instruction and a heat dissipation optimization strategy. Strong turbulent flow is generated in the loop reactor through high-speed circulating flow of the axial flow pump, continuous and uniform shearing and mixing are provided for reaction materials, a retention area possibly formed by high-viscosity fluid can be effectively broken, full contact of monomers, oligomers and growing two-dimensional lamellas is ensured, the mass transfer efficiency is improved, and the mass transfer efficiency is improved. Non-uniform local concentration and a reaction dead zone are avoided; dynamic optimization and safety interlocking protection of reaction parameters are realized by combining a kinetic model, so that the reaction controllability is improved, the production risk is reduced, and the product conversion rate and the molecular weight stability are guaranteed.

The invention discloses a method for producing 55% powdery monoammonium phosphate by using filter-press white fertilizer and phosphoric acid sludge acid, and belongs to the technical field of production of powdery monoammonium phosphate. According to the method for producing novel 55% powdery monoammonium phosphate in a tubular reactor by using waste white fertilizer and phosphoric acid sludge acid which cannot be treated in the filter-press production process, the production process flow is greatly shortened, the production cost is reduced, and the production efficiency is improved. The number of process pipelines and production equipment is reduced, the length of the process pipelines is shortened, the energy consumption and the equipment maintenance cost are greatly reduced, and the effects of saving energy, reducing consumption and improving quality and efficiency are achieved; meanwhile, the waste white fertilizer which cannot be treated in the filter pressing production process and the waste phosphoric acid slag slurry generated in phosphoric acid production are treated, and the production cost is reduced.

The utility model discloses a built-in filter screen of a tubular reactor, which comprises a filter screen, an auxiliary fixing frame is fixedly mounted on the filter screen, two connecting rods are fixedly connected onto the auxiliary fixing frame, two mounting frames are fixedly mounted on the filter screen, a fixed cylinder is fixedly mounted between the two mounting frames in a penetrating manner, and the two connecting rods are fixedly connected with the fixed cylinder respectively. The arc-shaped clamping blocks can be simply limited with the edge of the reactor, the occurrence probability of safety accidents is greatly reduced, the stability of the filter screen is ensured through the auxiliary fixing frames, deformation of the filter screen is avoided, after preliminary welding is completed, the auxiliary welding plates are inserted into the corresponding inserting grooves, the auxiliary welding plates and the inner wall of the reactor are further welded, and the welding efficiency is improved. Therefore, the welding area is increased, and the overall stability is improved.

The utility model relates to a Grignard reagent continuous synthesis device and system, the device comprises a tubular reactor main body and a stirrer, the lower end and the upper end of the reactor main body are respectively provided with a liquid feed port and a discharge port, and the top of the reactor main body is provided with a magnesium powder feeding unit for connection; a jacket for heating and cooling reaction materials is arranged outside the reactor main body; the stirrer comprises a motor and a supporting rod connected with the output end of the motor, the motor is arranged at the top of the reactor main body, the supporting rod extends downwards from the top in the reactor main body, a mixing assembly is arranged on the supporting rod and comprises a push type stirring rod, and holes are distributed in the push type stirring rod. According to the utility model, continuous and efficient mixing of raw materials and magnesium metal and rapid heat transfer and temperature control can be realized, so that the reaction time is greatly shortened; and the flowing process of the materials in the reaction main body is close to a plug flow process, so that the backmixing of the materials is reduced, the radial mixing of the materials is increased, and the product quality of the Grignard reagent is improved.

Production of HFO-1132 and, in particular, HFO-1132E, may be produced from 1,1,2-trichloro-1,2,2-trifluoroethane (CFC-113) or CTFE. The present disclosure provides a non-catalytic method for producing trans-1,2-difluoroethylene (HFO-1132(E)), comprising: providing a reactant composition comprising cis-1,2-difluoroethylene (HFO-1132(Z)); and isomerizing the HFO-1132(Z) in an electric heater reactor or a tubular reactor at a temperature of from about 350°C to about 600°C to produce a product composition comprising HFO-1132(E).

The invention provides a production method of 2, 3, 5-trimethylhydroquinone diester, which comprises the following steps: carrying out rearrangement reaction on 2, 6, 6-trimethyl-cyclohexyl-2-ene-1, 4-diketone and an acylating agent in a tubular reactor filled with a catalyst to obtain the 2, 3, 5-trimethylhydroquinone diester, all reaction parameters in the tubes of the tubular reactor meet the relationship shown in the formula 1. The production method has the advantages of high production efficiency, small corrosion to equipment and simple subsequent treatment process, and is suitable for wide popularization and application.

A preparation system for preparing polylactic acid, comprising a circulating system formed by a series connection of a tank reactor, a melt pump and a tubular reaction unit; the tank reactor comprises a feeding port, a vacuum device connecting port, a mechanical stirrer, a material inlet, a material distributor and a material outlet; the inlet and outlet of the melt pump are connected to the material outlet of the tank reactor and the material inlet of the tubular reaction unit respectively; the tubular reaction unit (3) comprises n tubular reaction sub-units arranged in series, n≥1; the tubular reaction sub-unit comprises a material mixer and a tubular reactor connected in series; at least one material mixer is provided with a deactivator adding pipeline. A preparation method is also provided. The preparation system combines the tank reactor and the tubular reactor and forms a circulating loop, so that the equipment is less and the operation is stable; the preparation method uses the tank reactor in the early stage and uses the tubular reactor in the later stage, so that the mixing effect can be effectively improved, the raw material waste can be avoided, and the quality of the polylactic acid product can be improved.

The invention relates to the technical field of wastewater treatment, and discloses an external carbon dioxide device and method for decalcifying fluorine-containing wastewater, the external carbon dioxide device comprises an equipment system and a control system, the equipment system comprises a wastewater adjusting tank, a calcium salt adding unit, a carbon dioxide gas source, a tubular reactor and a sedimentation tank, the wastewater adjusting tank, the tubular reactor and the sedimentation tank are communicated through a water pipe, and the calcium salt adding unit and the wastewater adjusting tank are communicated in the tubular reactor through a water pipe. The problem that the pH value rises due to the fact that calcium salt is introduced into the tubular reactor is uninterruptedly solved, on one hand, the risks that the local pH value is too low and HF escapes due to the fact that strong acid is added for balancing the pH value in the tubular reactor can be avoided, and on the other hand, the overall component of carbonic acid is clean, no extra impurities are generated, and the impurities are difficult to remove; and the overall cost of CO2 is low, so that the wastewater cleaning cost can be reduced.

The application discloses a method for preparing N-ethoxyl oxalyl alanine ester by using a dynamic tubular reactor, which comprises the following steps: (1) reacting L-alanine, diethyl oxalate and 4-dimethylaminopyridine in the dynamic tubular reactor; (2) removing light components from the reaction solution; (3) reacting the reaction solution after removing the light components and ethanol in the dynamic tubular reactor; and (4) obtaining N-ethoxyl oxalyl alanine ester after removing the light components. Compared with traditional kettle reactors and tubular reactors, the method adopts the dynamic tubular reactor to prepare N-ethoxyl oxalyl alanine ester, and through the regulation of reaction parameters, the selectivity of key by-products N-oxamide and double N-oxamide can be effectively controlled below 2%. The process has the advantages of high reaction yield, high degree of continuous operation, significantly shortened reaction time and no use of high-toxicity materials such as benzene.

The utility model discloses a micro-channel dropwise adding tubular reactor, and solves the problems that in the prior art, when some violent reaction materials are added, a large amount of reaction heat is released in a short time, and if the heat cannot be removed in time, potential safety hazards such as chemical explosion can be caused; 2, continuous quantitative production cannot be carried out, so that the production cost is too high; the device is characterized in that a micro-channel dripping device is arranged at the inlet end of each reaction tube, the reaction tubes are inserted into the sleeve type heat exchange tubes, every two adjacent reaction tubes are connected in series into a whole, a heat exchange medium inlet tube and a heat exchange medium outlet tube are arranged at the two ends of each sleeve type heat exchange tube, and materials in the reaction tubes and heat exchange media in the sleeve type heat exchange tubes are subjected to countercurrent flow heat exchange. Reaction heat is removed in time, and continuous and safe operation of production can be ensured. The micro-channel dropwise adding tubular reactor has the advantages of safety, high efficiency, low cost and the like, and can be widely applied to industries such as petrochemical engineering, fine chemical engineering, food, biological pharmacy and the like.

The invention discloses an ultrasonic enhanced organic catalytic continuous flow polypeptide synthesis method. The preparation method comprises the following steps: (1) respectively dissolving an amino alcohol initiator, an organic catalyst and an amino acid intracyclic anhydride monomer in an organic solvent; (2) injecting the three solutions into a tubular reactor equipped with an ultrasonic water bath constant-temperature oscillator; (3) realizing continuous flow precise synthesis of polypeptide with different molecular structure parameters by adjusting the types of three reactants, namely an amino alcohol initiator, an organic catalyst and an amino acid intracyclic anhydride monomer, the sequence of injecting the reactants into the reactor and the relative speed of injecting the reactants into the reactor; and (4) carrying out flowing ring-opening polymerization reaction, flowing into a collecting bottle containing a reaction terminator, precipitating, centrifuging, and carrying out vacuum drying to remove the residual solvent, thereby obtaining the polypeptide. The method provided by the invention has the characteristics of high synthesis efficiency, no metal catalyst residue in the product, easy regulation and control of product structure parameters, easy non-amplification, easy large-scale production and easy automatic production.

The present application relates to the field of organic synthesis, in particular to a synthesis method of fatty acid diester compounds. The method is carried out in a device, which comprises a shell-and-tube reactor provided with a tube pass for gas passing and a shell pass for liquid passing; the tube pass and the shell pass are communicated through openings on the tube wall, and the openings are limited for gas phase raw materials to pass; the method comprises: feeding a solution containing a catalyst and a terminal diene into the tube pass of the reactor, feeding a gas phase containing CO into the tube pass of the reactor, and part of the CO passes through the openings of the tube wall into the tube pass to react with the solution containing the catalyst and the terminal diene. The present application adopts a specific structure of the reactor to synthesize the fatty acid diester compounds, and has excellent raw material conversion rate, product selectivity and reaction efficiency.

The application provides a preparation method of 3,7-dinitro-1,3,5,7-tetraazabicyclononane, comprising the following steps: 1) feeding a first material comprising urea and concentrated sulfuric acid and a second material comprising fuming nitric acid and concentrated sulfuric acid into a microchannel reactor to perform a first-stage nitration reaction, to obtain a first-stage nitration reaction liquid; 2) feeding the first-stage nitration reaction liquid into a first tubular reactor to perform a second-stage nitration reaction, to obtain a second-stage nitration reaction liquid; 3) feeding the second-stage nitration reaction liquid and water into a second tubular reactor to perform a hydrolysis reaction, to obtain a hydrolysis liquid; 4) feeding the hydrolysis liquid and a third material comprising polyoxymethylene and ammonia water into a third tubular reactor to perform a condensation cyclization reaction, to obtain 3,7-dinitro-1,3,5,7-tetraazabicyclononane. The preparation method has the advantages of high safety, less waste pollution and simple operation.

The invention first relates to a process for the dehydrogenation of a feedstock comprising cycloalkanes having 6 carbon rings to produce an effluent comprising hydrogen and aromatics, using a reaction section comprising at least one multi-tubular reactor comprising at least two tubes comprising a fixed bed of at least one dehydrogenation catalyst and a shell comprising at least one fixed bed of at least one dehydrogenation catalyst, -the feedstock is fed into the tube in gaseous form at an inlet temperature of the feedstock greater than or equal to 300 DEG C, at an inlet pressure of the feedstock between 0.1 and 1 MPa, and at a feedstock weight hourly space velocity (WWH) at an inlet between 1 and 15 h <-1 >,-a heat transfer fluid is circulated in the shell, the heat transfer fluid is introduced in gaseous form at the inlet of the shell, and-the heat transfer fluid is introduced in gaseous form at the inlet of the shell. The heat transfer fluid is introduced into the shell at an inlet temperature of between 320 DEG C and 400 DEG C and at an inlet pressure of between 0.10 MPa and 1.10 MPa at a flow rate such that the ratio of the weight flow rate of the heat transfer fluid at the inlet of the shell to the weight flow rate of the feedstock at the inlet of the tube is greater than or equal to 1.0.

The present application relates to the technical field of insulating base preparation, in particular to an easy crosslinking cable insulating base and a preparation method thereof.The preparation method of the easy crosslinking cable insulating base comprises the following steps: pressurizing ethylene and feeding it into a first-stage tubular reactor, adding end olefins, di-olefins and initiators in front of each stage of the tubular reactor respectively to initiate a reaction, and obtaining a high-pressure polyethylene base, which is the easy crosslinking cable insulating base.The present application increases the content of double bonds and branched chains by adding di-olefins and end olefins, preferably adding di-olefins and end olefins at a certain position, increasing the reaction temperature, reducing the reaction pressure, using a high-temperature initiator instead of a low-temperature initiator and other methods, enhances the chain transfer reaction and copolymerization reaction, increases the content of double bonds and branched chains, and prepares the easy crosslinking cable insulating base.Using the easy crosslinking cable insulating base to produce high-voltage cable insulating material can reduce the amount of crosslinking agents, antioxidants and other additives, and better meet the use requirements of high-voltage cables.

The invention discloses an engineering continuous preparation method of 3-amino-4-amidoxime furazan, which is characterized in that engineering synthesis of 3-amino-4-amidoxime furazan is technically verified and optimized by adopting a continuous flow micro-channel reactor and a dynamic tubular reactor technology, and malononitrile is used as a starting raw material to react in the micro-channel reactor; the preparation method comprises the following steps: carrying out nitrosation and oximation to obtain a trioxime solution, conveying trioxime and a cyclization solution to a dynamic tubular reactor, heating to a certain temperature, reacting and curing, overflowing into a collection tank through the tubular reactor, adjusting the pH value of a reaction solution, cooling, filtering, washing with water, and drying to obtain the 3-amino-4-amidoxime furazan. The AAOF engineering manufacturing process scheme is provided, AAOF kilogram-level engineering preparation under automatic control is achieved, the problems of material precipitation, heat exchange and the like in an intermittent production mode are solved, and the synthesis efficiency and the synthesis safety are greatly improved.

The invention discloses a device for preparing oxamide by a continuous method and application of the device in preparation of spherical high-purity oxamide. Belongs to the technical field of oxamide preparation devices. The device comprises a raw material feeding and mixing area, a reaction area, a separation and purification area and a recovery area. The reaction zone comprises a series tubular reactor, a divergent pressure-stabilizing current equalizer and a parallel tubular reactor, and the Y-shaped mixer, the series tubular reactor and the divergent pressure-stabilizing current equalizer are sequentially connected through pipelines; the divergent pressure-stabilizing flow equalizer comprises a divergent pipe body and a flow equalizing grating plate, the flow equalizing grating plate is arranged in the divergent pipe body, and the cross section of the divergent pipe body is gradually increased from the feed port to the discharge port. The device for preparing oxamide through the continuous method has the beneficial effects that the structure is simple, the cost is low, spherical high-purity oxamide can be continuously and efficiently produced, and the device has wide application prospects and high economic value.

This utility model relates to the field of tubular reactor technology and discloses a gas-liquid-solid catalyst mixing rotary shearing tubular reactor, including a reaction cylinder. A fixed packing frame is movably sleeved inside the reaction cylinder. Several flow holes are circumferentially opened on the outer surface of the fixed packing frame. A rotating shaft is rotatably sleeved inside the fixed packing frame. Several exhaust holes are opened on the outer surface of the rotating shaft. A front flange is fixedly installed on the surface of the front connecting flange of the cylinder. An air inlet channel is opened in the middle of the front flange. A liquid inlet is opened on the front connecting flange of the cylinder. This utility model allows air to enter through the rotating shaft. The gas is fully dispersed by the dispersion column. At the same time, the liquid entering through the liquid inlet is driven by the rotating shaft to form a strong shearing effect and a high-efficiency heat and mass transfer effect, which promotes full contact between the gas and liquid phases and the solid catalyst in the solid packing frame. This effectively solves the problem that the solid catalyst cannot effectively participate in the reaction in the rotary shearing tubular reactor and expands the application range of the reactor.

The utility model discloses a safe, efficient and energy-saving ammonium nitrate solution production system which comprises an efficient tubular reactor, a reactor flash tank and a reflux mixer, the efficient tubular reactor is communicated with the reactor flash tank and the reflux mixer, and an ammonia gas pipe and a nitric acid pipe are connected to the efficient tubular reactor. An adjusting loop is connected among the ammonia gas pipe, the nitric acid pipe and the efficient tubular reactor, the reflux mixer comprises a neutralization washing tower, and the reactor flash tank is further connected with a falling film primary evaporator. Compared with the prior art, the system provided by the utility model has the advantage that the ammonium nitrate solution can be prepared safely, efficiently and in an energy-saving manner by utilizing the pressurized tubular reactor and the MVR evaporator.