167 results about "Consecutive reaction" patented technology

The invention relates to an MOF confinement ruthenium cluster catalyst for methanation of carbon dioxide as well as a preparation method and application of the MOF confinement ruthenium cluster catalyst. The catalyst comprises a carrier and an active component loaded on the carrier, the carrier comprises a metal organic framework containing hydroxyl; the metal organic framework comprises UiO-66 (UiO-66); the active component comprises metal ruthenium; the active component grows in a pore channel of the carrier and forms a metal cluster. The catalyst provided by the invention realizes 100% methane selectivity and 98.4% carbon dioxide (CO2) conversion rate under the conditions of 1 MPa and 220 DEG C, is almost close to thermodynamic limit equilibrium conversion rate (99.4%) and is superior to the currently reported Ru-based CO2 methanation catalyst, and the catalyst shows good catalytic activity and structural stability in the process of continuous reaction for 650 hours. The catalyst provided by the invention has the characteristics of simple preparation method, high metal dispersibility, mild reaction conditions, high conversion rate, good selectivity, excellent stability and the like.

The invention discloses a continuous reaction device and method for producing 2-amino-4-methylbenzothiazole, and belongs to the technical field of compound production. The invention relates to a continuous reaction device for producing 2-amino-4-methylbenzothiazole, which comprises a first-stage reaction kettle and further comprises a stirring mechanism arranged in the first-stage reaction kettle and used for stirring chlorine and a mixed solution in the first-stage reaction kettle; the driving mechanism is arranged at the top of the first-stage reaction kettle and is used for driving the stirring mechanism to perform stirring action in the first-stage reaction kettle; the chlorine injection mechanism is connected with the stirring mechanism; the air exhaust mechanism is arranged at the top of the first-stage reaction kettle and is connected with the driving mechanism; the multistage reaction kettles are adopted for continuous operation to eliminate downtime, so that the problem of low production efficiency caused by repeated heating and cooling due to the use of intermittent reaction kettles in the traditional process is solved, the chlorine utilization rate is improved, and the production and processing cost is effectively reduced.

The invention relates to a method for preparing methylsulfonyl fluoride from methylsulfonyl chloride, which comprises the following steps: by taking methylsulfonyl chloride as a raw material, adding a fluorination catalyst and anhydrous hydrogen fluoride as a fluorinating agent, and continuously reacting in an HL microchannel reactor to prepare methylsulfonyl fluoride, the HL microchannel reactor is of a three-stage nested microchannel structure, a first-stage mixing area is a conical spiral channel, a second-stage reaction area is a snakelike corrugated channel, and a third-stage extension area is a straight channel. The reaction rate is high, the unit consumption of anhydrous hydrogen fluoride serving as a fluorinating agent is low, the raw material cost is saved, the preparation cost is greatly reduced, and compared with a conventional tank reactor, the HL microchannel reactor is high in reaction rate, convenient to clean, capable of saving manpower, capable of achieving continuous preparation and convenient to achieve large-scale industrialization.

The invention provides a preparation method of 2-pentyl-2-cyclopentenone, and belongs to the technical field of organic synthesis. The preparation method comprises the following steps: carrying out a first-stage isomerization reaction on 2-pentylidene cyclopentanone and a first composite catalyst in a first atmosphere to obtain an intermediate, carrying out a second-stage isomerization reaction on the intermediate and a second composite catalyst in a second atmosphere, and controlling the volume ratio of nitrogen to hydrogen in the first atmosphere and the second atmosphere to obtain the 2-pentylidene cyclopentanone. In the first-stage isomerization reaction, the conversion rate of converting 2-pentylidene cyclopentanone into 2-pentyl-2-cyclopentenone is increased, and in the second-stage isomerization reaction, the use amount of hydrogen in the second atmosphere is reduced, the temperature of the second-stage isomerization reaction is increased, generation of by-products is inhibited, and the yield of 2-pentylidene cyclopentanone is increased. Further, the yield and the purity of the 2-pentyl-2-cyclopentenone can be improved. According to the preparation method, the first-stage isomerization reaction and the second-stage isomerization reaction are continuous reactions, intermittent reactions are not needed, and the preparation method is more suitable for industrial application.

The invention belongs to the field of new energy NCM ternary precursors, and particularly relates to a preparation method of a doped and (or) coated ternary precursor. A continuous and intermittent dynamic switching process is created for the first time, main particles are generated through continuous reaction, and after the particle size reaches a preset value, an intermittent process mode is selectively switched for precise coating; the double reaction kettles are linked, the first reaction kettle is used for continuous doping reaction, and the second reaction kettle is used for selective intermittent coating, so that production of products of multiple specifications is supported while the productivity is improved. The method solves the technical bottlenecks of narrow particle size distribution, non-uniform coating and limited productivity in the traditional process, realizes effective preparation of a wide-distribution doped type or doped coating type precursor, remarkably reduces the production cost, and is suitable for the field of consumer electronic battery materials.

The present application relates to a capped, modified solution-styrene butadiene rubber and a preparation method therefor. The method comprises: in a multi-tank continuous reaction process, mixing styrene and butadiene in a solvent, then mixing with a structure modifier and an initiator to copolymerize styrene and butadiene to obtain an intermediate polymer; and performing a capping reaction with a capping monomer to obtain a capped polymer; then reacting with a modifier to obtain a modified polymer; and finally mixing with a terminator to obtain a capped, modified solution-styrene butadiene rubber. Thus, the problem of poor filler dispersibility is improved, which can stabilize the polymer molecular structure and effectively improve the processing performance of a product.

Provided is an alkane production method wherein a continuous reaction of an alcohol and hydrogen proceeds at a low reaction pressure, carbon reduction from the alcohol can be suppressed, and the conversion rate is excellent. This alkane production method for producing an alkane from a C8-22 alcohol comprises a step in which the alcohol and hydrogen are continuously reacted under the following conditions. (i) The reaction is carried out in the presence of a zeolite carrier supporting palladium, the reaction temperature is 180°C or higher, and the hydrogen pressure is 0 MPa to 0.7 MPa in terms of gauge pressure. (ii) The space velocity (SV) of the hydrogen relative to the volume of a catalyst in which the palladium is supported on the zeolite carrier is 1200 h–1 to 2400 h–1. (iii) The space velocity (SV) of the alcohol relative to the volume of the catalyst in which the palladium is supported on the zeolite carrier is 8 h–1. (iv) The zeolite carrier is of an H-beta type or an H-ZSM-5 type, has a molar ratio (SiO2 / AL2O3) between silica (SiO2) and alumina (AL2O3) of 23 to 27, and has a palladium support quantity of 0.1 mass% to 5 mass%.

The application provides a method for synthesizing an eplerenone intermediate N-1 by one-pot method, and belongs to the technical field of organic synthesis. The method is characterized in that: the eplerenone intermediate N-4 is dissolved in dichloromethane, a potassium carbonate aqueous solution and dibromohydantoin are added to perform an opening ring reaction; after the reaction is completed, hydrochloric acid is directly added to perform a rearrangement reaction; then water is separated and methanol is added in the organic layer to perform an ozonation reaction; then sodium sulfite is added to perform a reduction reaction; then hydrochloric acid is added to perform a methyl esterification reaction, so as to obtain the eplerenone intermediate N-1 crude product, and finally the eplerenone intermediate N-1 fine product is obtained through refining. The method realizes the one-pot synthesis of the eplerenone intermediate N-1 from the eplerenone intermediate N-4 through the continuous reactions of opening ring, rearrangement, ozonation, reduction and methyl esterification, and can avoid column chromatography purification, so that the method becomes a green chemical process route with greatly reduced organic solvent consumption and wastewater.

The invention discloses a continuous production process of 1, 3-dimethyl-2-imidazolinone, and relates to the technical field of chemical processes, the process takes ethylene urea, formic acid, paraformaldehyde and water as raw materials, and the whole-process continuous production is realized through the steps of material preparation, batching, continuous reaction and post-treatment. The method is characterized in that water is used as a solvent, the reaction temperature is 150-250 DEG C, the pressure is 1-8 MPa, and the purity of the rectified product is greater than or equal to 99.5%. The method overcomes the defects of insufficient reaction and high cost of the existing intermittent process, has the advantages of high conversion rate, few impurities, few three wastes, easiness in automation and the like, and is suitable for industrial large-scale production.

The utility model discloses a continuous reaction device for compound synthesis, which comprises a reaction device, and the reaction device comprises a beaker, a rubber plug, a clamping ring and a turbine; the storage and placement assembly comprises a fixing ring, a connecting block, a connecting rod, a placement ring and a placement groove; the fixing ring is fixed on the upper surface of the beaker, the connecting block is fixed at one end of the back of the fixing ring, the connecting rod is located on one side of the connecting block, the placing ring is fixed at one end of the connecting rod, and the placing groove is located below the placing ring. By arranging the fixing ring, the connecting block, the connecting rod, the placing ring and the placing groove, when the rubber plug is pulled out, the rubber plug is placed in the placing ring, the rubber plug is clamped with the placing ring, and the bottom ends of the liquid inlet pipe and the air outlet pipe are placed in the placing groove, so that the rubber plug does not need to be placed at other places, and the rubber plug is prevented from being lost; and the rubber plug is firmly clamped with the placing ring, so that the rubber plug does not fall off along with the falling of the beaker.

The invention relates to a continuous preparation method and system of 7-aminocephalosporanic acid, and the method comprises the following steps: regulating a CPC concentrated solution to a preset concentration and a preset temperature to obtain a CPC diluent; the CPC diluent is introduced into a first filter to be filtered, and CPC filtrate is obtained; the CPC filtrate is introduced into a plurality of continuous reaction modules filled with cephalosporin C acylase, the continuous reaction modules automatically adjust reaction liquid to preset parameters, feeding is carried out while stirring is carried out for dynamic continuous reaction, 7-ACA lysate is obtained after the filtrate passes through the continuous reaction modules, and 7-ACA filtrate is obtained after the 7-ACA lysate is introduced into a second filter to be filtered; and pumping the obtained 7-ACA filtrate into a 7-ACA storage device. The CPC concentrated solution is taken as a preparation starting point, the temperature and pH of the feed liquid are automatically regulated and controlled after the feed liquid enters the continuous reaction module for cracking reaction, operations such as feeding, discharging and manual regulation and control are omitted, and a foundation is laid for comprehensive automatic continuous production of 7-aminocephalosporanic acid.

The invention belongs to the field of pharmaceutical chemistry preparation, discloses a preparation method of 6-amidino-2-naphthols and its intermediate M1, and prepares nafamostat mesylate using the method. The preparation method provided by the present invention is: using SM1 as starting material, and obtaining intermediate M1 by hydroxylamine addition, M1 is reduced to obtain 6-amidino-2-naphthols M2 by means of continuous reaction or stepwise reaction, condensed under the action of a condensing agent, and then methanesulfonic acid salifies to obtain nafamostat mesylate. The preparation method of the present invention has short reaction time, high yield, high product purity, mild reaction conditions, simple post-processing, avoids the dangerous reaction, dangerous reagent, controlled reagent involved in traditional route, therefore the safety of operation and product is higher, is conducive to industrialized large-scale production.

The utility model discloses a continuous reaction device for an inorganic binder curing material, and relates to the technical field of inorganic binders. The inorganic binder heating device comprises a base, an inorganic binder heating box is arranged on the base, a plurality of filter holes are formed in the outer side of the inorganic binder heating box, guide plates corresponding to the filter holes are arranged on the outer side of the inorganic binder heating box, and forming boxes corresponding to the guide plates are arranged on the base. And a collecting box is arranged at the bottom of the inner wall of the inorganic binder heating box body. Through the arrangement of the continuous impact assembly, the rotating rod can rotate to drive the rotating plate to rotate and incline and drive the continuous impact assembly to operate at the same time, the rotating plate in the rotating and inclining process can be impacted to generate vibration, and impurities in an inorganic binder rapidly slide into the collecting box through vibration of the rotating plate and the inclined slope. And the impurities can be completely removed without additional operation, so that the labor intensity is reduced.

The invention belongs to the technical field of production of fine chemicals, and discloses a continuous synthesis process of 3, 4-difluorobenzonitrile, which comprises the steps of dehydration, water-carrying agent removal, product removal, solid-liquid separation, product refining and the like. According to the process, continuous reaction rectification, water removal during reaction, water-carrying agent removal, product collection and continuous water, water-carrying agent and product removal are adopted, so that the continuity of the reaction and separation process is realized, the problems of long time, dense personnel, high labor intensity and large occupied area in the intermittent operation process are avoided, unorganized emission in the filling process is eliminated, and the production cost is reduced. The raw material and energy utilization rate is improved, and the process yield is improved.

The invention belongs to the technical field of fluorine-containing polymer production, and particularly relates to a fluorine-containing olefin continuous polymerization system and a working method. The fluorine-containing olefin continuous polymerization system comprises a monomer conveying unit, a solvent conveying unit, a mixer, a reaction kettle, an additive adding unit, a flash tank and a drying tower, wherein the monomer conveying unit and the solvent conveying unit are used for conveying a monomer and a solvent respectively, mixing the monomer and the solvent through the mixer and inputting the mixture into the reaction kettle from the bottom of the reaction kettle; the auxiliary agent adding unit is used for adding an auxiliary agent into the reaction kettle; the flash tank is communicated with the top of the reaction kettle and is used for receiving mother liquor in the reaction kettle, separating unreacted monomers and polymers in the mother liquor and respectively discharging the unreacted monomers and polymers into the monomer conveying unit and the drying tower; and the drying tower is used for drying and separating the polymer to obtain a product and a solvent. According to the fluorine-containing olefin continuous polymerization system disclosed by the invention, full-liquid-filled kettle type reaction is adopted, and no gas phase space exists in the reaction kettle, so that the accumulation of monomers is reduced, and the explosion risk is sharply reduced. During continuous reaction, the concentrations of fluorine-containing olefin, an initiator and the like in the reaction are fixed, and the reaction temperature, the reaction pressure and the retention time of materials are also fixed, so that the product quality of the polymer is constant and controllable.

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

The present invention relates to a method for preparing lactide by continuous coupling, comprising: (1) mixing lactic acid oligomers with a depolymerization catalyst, preheating the mixture, and continuously conveying the mixture to a depolymerization reactor for reaction, wherein the light fraction after the reaction enters the bottom of a distillation system; and (2) after treatment in the distillation system, the resulting bottom liquid phase fraction is returned to the depolymerization reactor, and the gaseous lactide is condensed to obtain a lactide product. The present invention couples the depolymerization reactor with the distillation system for continuous reaction, thereby reducing the probability of lactide racemization and substrate coking and carbonization, and improving the product quality and yield of the entire synthesis process.

The utility model discloses a pyrazole alcohol diazotization shunting type pipeline continuous reaction device, and relates to the technical field of reaction devices. The pyrazol alcohol diazotization flow-dividing type pipeline continuous reaction device comprises a micro-mixer, a first guide pipe and a second guide pipe are fixed to the two inlet ends of the micro-mixer respectively, first valves are installed on the first guide pipe and the second guide pipe respectively, a tubular reactor is fixed to the outlet end of the micro-mixer, and a reaction valve is fixed to the outlet end of the tubular reactor. A bottom plate is fixed at the bottom of the reaction valve, a cover body is mounted above the reaction valve, and a lifting assembly for lifting the cover body above the reaction valve is mounted above the bottom plate; according to the device, an anti-deposition structure is specially designed, so that the auger conveying piece can be driven by the sliding block to move and rotate along the sliding groove, raw materials are effectively prevented from being deposited at the bottom of the reaction valve, the problem of insufficient reaction caused by accumulation of the raw materials is solved, and the reaction efficiency and the product quality are further improved.

The invention discloses a method for continuously preparing trimethylolpropane phosphite, which comprises the following steps of: metering and conveying a trimethylolpropane solution containing a catalyst and phosphorus trichloride serving as raw materials into a single-stage or multi-stage series falling film reactor respectively through a pump for continuous reaction, and arranging a jacket outside the reactor for temperature control, solvent steam and generated hydrogen chloride gas in the reaction process are discharged from the upper part of the reactor, and after a certain retention time, reaction completion liquid flows out from the bottom of the reactor to obtain the product trimethylolpropane phosphite. The continuous preparation of the trimethylolpropane phosphite ester is realized through the falling film reactor, the synchronous removal of the solvent and the byproduct hydrogen chloride is realized while the reaction is completed, the reaction efficiency is high, the system is simple, the cost is low, the yield is high, the intrinsic safety is high, and industrial production is easy to realize.

The invention provides application of a compound in preparation of an additive for olefin carbonyl synthesis reaction, and relates to the technical field of catalytic reaction. The compound provided by the invention is used as an auxiliary agent for olefin carbonyl synthesis reaction, can inhibit agglomeration and inactivation of a metal catalyst, increase the dispersity of a palladium metal catalyst, maintain the concentration of the metal catalyst and reduce the use cost of the catalyst in the olefin carbonyl synthesis reaction, and has the advantages of simple method operation, mild reaction conditions and high yield. The auxiliary agent is recycled in the continuous reaction device, the product is easy to separate, and large-scale industrial production can be realized.

The present application relates to fluorination equipment technical field, especially to a kind of fluorinated carbonate-based solvent's continuous reaction device, including reaction main body, inside has reaction cavity;Gas-solid premixing module is communicated with the bottom of reaction cavity tangentially, for making fluorine gas and solid catalyst fully mixed after jointly entering reaction cavity;Liquid distribution module is set in reaction cavity top, and evenly spreads reaction liquid in reaction cavity;Heat exchange reaction module is set in reaction cavity inside and located below liquid distribution module, guides mixed gas stream and reaction liquid to fully counter-current contact, while direct heat exchange is carried out in reaction interface.The continuous reaction device provided by the present application guides three-phase reactants to be evenly distributed in reaction cavity by heat exchange reaction module, then fully contacts reaction, and the heat of reaction process is promptly exchanged and exported, to ensure the normal progress of continuous production.

The application discloses a process for preparing 3-methyl-2-buten-1-al diisopentyl acetal by continuous reaction rectification. The process comprises the following steps: reacting and rectifying isopentenyl alcohol and isopentenyl aldehyde in a reaction rectification tower to prepare 3-methyl-2-buten-1-al diisopentyl acetal, characterized in that the content of 2-methyl-3-buten-2-al in the liquid phase of the third to fifth trays of the reaction rectification tower from bottom to top is less than or equal to 1 wt%. By the continuous reaction rectification process, the device can be stably operated for more than 7200 hours, and the economic benefit of the enterprise can be remarkably improved.

To provide a fully-continuous synthesis method of glyphosate.SOLUTION: In the present invention, high-purity glyphosate is prepared by using a fully-continuous system in which a feed pump, a plurality of micromixers, a plurality of microchannel reactors, a dynamic rotary reactor, a buffer tank, a back pressure valve, a continuous reaction-kettle-type reactor, and a continuous crystallizer are sequentially connected, in which glycine is used as a raw material.EFFECT: According to the present invention, stable fully-continuous industrial production is achieved, no external intervention is required during the process, the efficiency of time and space is high, the number of operators and the labor intensity are greatly reduced, the production cost is greatly reduced, complicated operations in the conventional reaction-vessel process, a rapid rise of temperature in the kettle and the risk of material ejection are avoided, production safety is improved, the quality of glyphosate products is ensured, the operation of the apparatus is stable, the reaction time is short, the reaction yield is high, and the quality of the product is stable.SELECTED DRAWING: Figure 1

This invention discloses a continuous production process for ethyl methyl carbonate (EMC), belonging to the field of organic carbonate synthesis technology. It aims to solve the problems of low conversion rate, poor selectivity, difficulty in catalyst separation and recovery, high energy consumption, and difficulty in stably preparing electronic-grade products in traditional batch processes. This invention uses dimethyl carbonate and ethanol as raw materials, employing a continuous reactive distillation coupled with a multi-stage distillation integrated process. Under the action of a solid base catalyst, a continuous transesterification reaction is achieved, simultaneously completing the discharge of the target product, online catalyst circulation, continuous separation of light and heavy components, and product purification. By precisely controlling the raw material ratio, reaction temperature, pressure, reflux ratio, and residence time, the entire process can operate continuously and stably. This invention features strong process continuity, high ethanol conversion rate, high EMC selectivity and yield, recyclable catalyst, low energy and material consumption, and the obtained product purity can reach electronic grade. It is suitable for the production of lithium-ion battery electrolyte solvents and is easy to scale up industrially and manage continuously.

This invention relates to the field of p-chlorobenzaldehyde preparation technology and discloses a method for the continuous preparation of p-chlorobenzaldehyde. The method includes: dissolving p-chlorobenzyl alcohol in a first solvent to obtain a homogeneous solution A; dissolving an oxidant, a catalyst accelerant, and a catalyst in a second solvent to obtain a homogeneous solution B; and pumping homogeneous solutions A and B into a microchannel reactor for reaction. The continuous preparation method for p-chlorobenzaldehyde provided by this invention uses p-chlorobenzyl alcohol as a raw material and combines it with a microchannel reactor for one-step continuous reaction to prepare p-chlorobenzaldehyde. This method can improve reaction efficiency, shorten reaction time, and simultaneously achieve low reaction temperature, high product yield, and virtually no hydrochloric acid wastewater generation.

The present invention discloses a glycine mixed crystal intermediate production method, and relates to the technical field of glycine production, the method comprises the following specific steps: raw material mixing and heating reaction: crushed solid chloroacetic acid, crushed liquid chloroacetic acid and recovered mother liquor are added into a continuous reaction kettle together, in the continuous reaction kettle, a reaction is performed for 2-4 h, the reaction temperature of the neutralization reaction stage is controlled in a low-temperature reaction zone, and after the neutralization reaction is completed, the reaction stage of generating glycine is entered. In the crystallization process, glycine and ammonium chloride are naturally saturated and separated out in the mother liquor to generate an intermediate, so that the operation steps and the use amount of methanol are reduced, and the crystallization process is continuously completed; meanwhile, the loss of urotropin in the reaction mother liquor is extremely small, the mother liquor can be recycled, and the mixture is put into the reaction kettle again after being mixed with new solid chloroacetic acid or liquid chloroacetic acid, so that the recovery rate of glycine is increased.

The invention discloses a heavy raw material lightening continuous reaction device and a method thereof, multiple raw materials are mixed and then jointly catalytically cracked, the catalytic conversion efficiency in the process of producing low-carbon olefins is further improved, and the product selectivity and yield are improved; the device comprises a continuous reactor, a separator, a gas conveying line, a solid conveying line and a crude oil conveying line, the gas conveying line and the crude oil conveying line are respectively connected with the bottom end of the continuous reactor, the solid conveying line is connected with the middle end of the continuous reactor, and the output end of the continuous reactor is connected with the separator; according to the method, crude oil is preheated and then enters a continuous reactor through a crude oil conveying line, low-carbon alkane enters the continuous reactor through a gas conveying line, solid raw materials enter a phase reactor through a solid conveying line, a catalyst enters the continuous reactor through a catalyst conveying line, a reaction is carried out for 1-4 s at the temperature of 470-700 DEG C and the pressure of 0.1-0.5 Mpa, and then a reaction product is conveyed to a separator to be separated. A target product is obtained; belongs to the technical field of heavy oil treatment.

The invention discloses continuous reaction mixing equipment for preparing an amino acid surfactant, and relates to the technical field of mixing equipment.The continuous reaction mixing equipment comprises an equipment body, a support is fixedly installed on one side of the top face of the equipment body, a fixing column is fixedly connected to the top end of the support, and the other end of the fixing column is fixedly connected with the surface of a lantern ring; a lantern ring is arranged on one side of the top surface of the equipment body, a reaction kettle is fixedly mounted on the lantern ring, a mixing box is arranged on the other side of the top surface of the equipment body, a liquid discharge pipe is fixedly connected to the rear side of the mixing box, and a control panel is fixedly mounted on the surface of the mixing box. The device is reasonable in structure, amino acid surfactants preliminarily mixed in the reaction kettle are conveniently input into the mixing box for further treatment through the material passing assembly, and then the amino acid surfactants in the reaction kettle are preliminarily mixed through the reaction assembly; and the re-mixing assembly can continuously mix the amino acid surfactants which are mixed preliminarily, so that the mixing effect is improved.

The invention discloses a continuous reaction device for photocatalyst preparation, and relates to the technical field of photocatalyst reaction equipment.The continuous reaction device comprises a reaction kettle, a conveying assembly is arranged above the reaction kettle, a first motor is fixedly connected to the upper portion of the reaction kettle, and the output end of the first motor is fixedly connected with a first rotating shaft; stirring blades are fixedly connected to the outer side wall of the first rotating shaft, a groove body is formed in the outer wall of the reaction kettle, an LED lamp tube is fixedly connected to the inner wall of the groove body, a protective shell is arranged on the outer side wall of the reaction kettle and located on the outer side of the groove body, and a heat dissipation assembly is arranged on the inner bottom wall of the protective shell. And a discharge pipe is arranged on one side of the reaction kettle in the tank body. By arranging the conveying assembly and the stirring blades, continuous conveying and stirring of materials are achieved, and the preparation efficiency of the photocatalyst is improved; the heat dissipation assembly is arranged, so that the heat dissipation effect is effectively improved, and the stable operation of the reaction device is ensured.

The present application relates to the technical field of organic synthesis, and particularly relates to a method for synthesizing 3-methyl-2-phenyl-2,3-dihydrobenzothiazine-4-ketone. A conventional method for synthesizing 3-methyl-2-phenyl-2,3-dihydrobenzothiazine-4-ketone generally uses anthranilic acid as a starting material, and needs to be subjected to six-step continuous reactions to obtain the product, and the reaction time is long, the yield is low, and the operation is complicated. In view of the above problems, the present application provides a method for synthesizing 3-methyl-2-phenyl-2,3-dihydrobenzothiazine-4-ketone, which uses 2-mercapto-N-methyl benzamide as a starting material, and is completed through one-step reaction, and the starting material and catalyst are easy to obtain, the operation is simple, the reaction is fast, the equipment requirement is low, the post-treatment is simple, and the yield is high.