128 results about "Batch reaction" patented technology

The invention provides a preparation method of apixaban, and belongs to the technical field of raw material medicine synthesis. The intermediate product 5 is prepared by adopting continuous flow equipment, so that the defect of low heat and mass transfer efficiency of an intermittent reaction kettle is overcome, the reaction danger coefficient is reduced, the reaction time is shortened, the product quality is improved, and the product yield is increased; a ferric trichloride / activated carbon-hydrazine hydrate system is adopted for nitro reduction, so that the selectivity is good, and the product purity and yield are improved; the ethanol solution of ammonia is adopted to replace ammonia water, CH3ONa / HCOONH2, mixed anhydride-ammonia water and the like in the prior art, the defects that in the prior art, the content of acid impurities is high, and the amount of post-treated ammonia-containing wastewater is large are overcome, and the environmental protection pressure is reduced while the product quality is improved.

The invention provides a method for continuously synthesizing 2-thiophenecarboxaldehyde by using a continuous flow reactor, and relates to the technical field of organic synthesis, and the method comprises the following steps: mixing thiophene and N, N-dimethylformamide (DMF) to form a material A; continuously inputting the material A and phosphorus oxychloride (POCl3) into a micro-channel continuous flow reactor through a high-pressure feeding pump, and controlling the reaction temperature to be 60-150 DEG C and the retention time to be 0.5-5 minutes; synchronously inputting the reaction liquid output by the micro-channel reactor and a sodium hydroxide aqueous solution into a dynamic tubular reactor, and carrying out hydrolysis reaction at 10-70 DEG C for 0.5-5 minutes; according to the method, the 2-thiophenecarboxaldehyde is obtained by extracting the 2-thiophenecarboxaldehyde by using dichloromethane (DCM), and a continuous flow reactor technology is adopted, so that the reaction efficiency is remarkably improved. Compared with the traditional batch reaction, the continuous flow reactor has higher mass transfer and heat transfer efficiency, can realize rapid reaction, shortens the reaction time, and improves the product yield at the same time.

The invention provides a method for preparing hydrogenated bisphenol A by continuous catalytic hydrogenation of a fixed bed. The method comprises the following steps: step A, mixing and preheating a bisphenol A solution, a low-carbon amine additive and hydrogen in a gas-liquid mixing preheater to prepare a reaction material; step B, enabling the preheated reaction material to flow through a fixed bed reactor preloaded with a Ru-based catalyst, and carrying out catalytic hydrogenation reaction in the fixed bed reactor to generate a product material; step C, separating the product material through a gas-liquid separator to obtain a hydrogenated bisphenol A solution and hydrogen, and recycling the hydrogen; and rectifying the hydrogenated bisphenol A solution to obtain hydrogenated bisphenol A. The method provided by the invention effectively overcomes the defect that the single-batch reaction time of the existing catalytic hydrogenation process reaches 4-12 hours, and greatly shortens the continuous catalytic hydrogenation reaction time; by adding the low-carbon amine auxiliary agent, the reaction activity is promoted, and the generation of dehydroxylation byproducts is reduced; the selectivity of the product can be effectively guaranteed, the product is easy to separate, the safety is good, the cost is obviously reduced, and industrial application is easy.

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 discloses preparation and application methods of a modified activated carbon adsorbent applied to removal of thioether compounds in styrene. The activated carbon adsorbent is characterized in that activated carbon is modified by using an acid and metal ion compounding method, the acid is selected from one of sulfuric acid, nitric acid and hydrochloric acid, the concentration of the acid is 1-7 mol / L, the metal ion is selected from one of Cu < 2 + >, Fe < 3 + > and Zn < 2 + >, and the loading capacity of the metal ion is 0.1-20 wt% of that of the activated carbon; according to the application method, modified activated carbon is taken as an adsorbent, and thioether is adsorbed through sigma complexation in a batch reactor at 30 DEG C, so that the purpose of removing thioether compounds in styrene is achieved. The adsorbent does not adsorb styrene and adsorbs at 30 DEG C, so that the styrene is not easy to be oligomerized, the loss of the styrene is avoided, and the static sulfur capacity of the adsorbent is improved from 2.5 mg / g which is not modified to 25mg / g after modification.

The invention relates to the field of chemistry, and discloses a method for continuously synthesizing 3, 5-dihalogen bromobenzene by using a continuous flow reactor, which is used for continuously synthesizing 3, 5-dihalogen bromobenzene by using the continuous flow reactor for the first time, changes a traditional kettle process into a continuous process, solves a series of problems of long reaction time, high safety risk and the like of batch-type reaction, and improves the yield of 3, 5-dihalogen bromobenzene. According to the present invention, the reaction conditions are mild, the reaction parameters of the 3, 5-dihalogen bromobenzene are optimized, the use of the expensive raw material or solvent is avoided, the raw material is simple and easily available, and the method has advantages of low production cost, simple operation, environmental protection, mild reaction, short reaction time, safe reaction safety compared with the conventional method, high conversion rate, less impurity, simple post-treatment, and industrial production benefiting, and can be used for industrial production of 3, 5-dihalogen bromobenzene. Compared with the prior art, obvious technical progress is achieved.

This invention discloses a microchannel continuous preparation method for S-(-)-bioprolol fumarate intermediates, belonging to the field of medicinal chemistry technology. The method includes dissolving 4-isopropoxyethoxymethylphenol and a base in a solvent to provide a mixture; and contacting R-epoxychloropropane with the mixture in a microchannel reactor to react and form [[4-[[2-(1-methylethoxy)ethoxy]methyl]phenoxy]methyl]ethylene oxide. This invention overcomes the shortcomings of low reaction yield and long reaction time in existing technologies. By synergistically adjusting the material concentration, flow rate, residence time, and other reaction conditions, it improves reaction efficiency, shortens the reaction cycle, and increases the molar yield to over 70%. It significantly surpasses traditional batch reactions in terms of reaction efficiency, reaction time, and byproduct control.

A system and method for chemically destroying, degrading and incinerating a fluorocarbon or fluorinated material, such as perfluoroalkyl and polyfluoroalkyl substances (PFAS), with reduced emissions of gaseous PFC is provided. The method includes mixing the fluorinated material with an aqueous alkoxide base in a batch reactor to form a suspension. The PFAS can be provided by AFFF. The reaction mixture is heated to a temperature ranging from about 25ºC to about 400ºC for about 0.5 hours to about 240 hours to defluorinated fluorocarbons in the PFAS and produce a defluorinated waste product. More specifically, the method converts organic fluorine present in the PFAS to inorganic fluoride. Thus, the defluorinated waste product can be incinerated with reduced emissions of harmful gaseous PFCs.

The application provides a method for preparing high-iron-phosphorus-ratio iron phosphate in batches at low cost, and the steps are as follows: S1. reacting a ferrous sulfate solution, a phosphorus salt solution and hydrogen peroxide to obtain amorphous iron phosphate; S2. filtering and washing the amorphous iron phosphate; S3. adding pure water to the filtered cake of the washed amorphous iron phosphate, stirring, heating, adding a crystal transformation promoter after keeping warm, and reacting to obtain iron phosphate dihydrate slurry, and reserving part of the iron phosphate dihydrate slurry; S4. squeezing, drying and calcining the remaining iron phosphate dihydrate slurry; S5. repeating steps S1-S4 in batches; if it is the first batch reaction, the crystal transformation promoter is phosphoric acid, and if it is not the first batch reaction, the crystal transformation promoter is a mixture of hydrogen peroxide and crystal nuclei prepared from the iron phosphate dihydrate slurry reserved in the last batch. The method can greatly save the preparation cost of iron phosphate, and the iron-phosphorus ratio of the prepared iron phosphate is above 0.99.

The invention discloses a batch reaction production process of hyperbranched polylysine, which comprises the following steps: by taking a 50% feed-grade L-lysine solution as a raw material, preparing, evaporating, polymerizing and recovering a product, and producing HBPL with the molecular weight of more than 20,000 Da in a special reactor with the volume of 2500-10,000 liters. In the evaporation stage, moisture is removed by adopting a controlled heating rate (not more than 50 DEG C / h before 160 DEG C and not more than 30 DEG C / h before 200 DEG C) and high-torque stirring; the polymerization stage is carried out at 200-210 DEG C for 1-3 hours, and the stirring speed can be adjusted to 120 rpm; in the product recovery stage, condensate water is rapidly added for dilution to 60% solution, and the solution is cooled to 40 DEG C or below. The process is efficient, extensible, stable in product quality and suitable for industrial production.

The utility model relates to the technical field of chemical equipment, and discloses a quick batch changing reaction kettle which comprises a kettle body, an inner container is detachably connected in the kettle body, a dismounting mechanism is fixedly connected to the top of the kettle body, a top cover is fixedly connected to the top end of the inner container, and a sealing mechanism is arranged in the top cover. The dismounting and mounting mechanism comprises a flange plate I, the bottom end of the flange plate I is fixedly connected to the top end of the kettle body, a plurality of hydraulic cylinders are fixedly connected to the inner wall of the bottom of the flange plate I, the driving ends of the hydraulic cylinders are fixedly connected with round blocks, and convex plates are fixedly connected to the far sides of the round blocks. According to the utility model, the inner container can be quickly lifted out, and a new inner container can be mounted through reverse operation, so that compared with the traditional batch changing mode, the batch changing time is greatly shortened from the traditional hour to the minute, the production efficiency is remarkably improved, the downtime of equipment is reduced, and higher productivity is brought to chemical production.

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

The invention belongs to the technical field of enzyme engineering, and particularly relates to an immobilized enzyme preparation containing D-psicose-3-epimerase cells as well as a preparation method and application of the immobilized enzyme preparation. The preparation method comprises the following steps: carrying out fermentation culture on genetically engineered bacteria containing thermal-stability D-psicose-3-epimerase to obtain wet thalli, mixing the thalli with egg shells and a diatomite carrier, immobilizing the obtained mixture on the carrier through a cross-linking agent, and carrying out separation, drying and granulation to obtain the immobilized enzyme preparation. According to the invention, the affinity between the immobilized carrier and microorganisms is stronger; the prepared immobilized enzyme preparation is high in mechanical strength and stable in enzyme activity, is used for preparing D-psicose through D-fructose isomerization, and is high in conversion efficiency. Under the condition of 60 DEG C, after the batch reaction is repeated for 10 batches, the conversion rate is still greater than 28%; 700g / L fructose solution is used as a substrate, the reaction is continuously carried out for 31 days, the average conversion rate is 28% or above, and the method has relatively high industrial advantages.

The invention provides a dynamic continuous flow synthesis process of 5-nitrosalicylaldehyde, which comprises the following steps: filling heteropoly acid loaded on spherical activated carbon into a dynamic continuous flow reaction tube, giving a certain external temperature, adding salicylaldehyde into an organic solvent, and reacting at a certain temperature to obtain the 5-nitrosalicylaldehyde. And simultaneously pumping the 5-nitrosalicylaldehyde and nitric acid into a dynamic continuous flow reaction tube filled with a heteropolyacid immobilized catalyst at a certain flow speed, and reacting to obtain the 5-nitrosalicylaldehyde. In the process of synthesizing the 5-nitrosalicylaldehyde, the raw material concentration, the raw material flow rate, the nitric acid flow rate and the reaction temperature are strictly controlled, so that a large amount of isomer impurities are prevented from being generated, the conversion rate during nitration is favorably improved, the reaction yield is improved, the wastewater discharge is reduced, and meanwhile, the safety risk of the traditional nitration kettle type reaction is reduced. Experimental results show that the yield of the 5-nitrosalicylaldehyde is 90% or above, and the purity of the 5-nitrosalicylaldehyde is 98% or above.

The application discloses a kind of based on neural network's semi-batch reaction thermal behavior identification method, first define thermal behavior label, solve dimensionless mathematical model;Again, extract core numerical features from traditional criterion, and match with NI, TR and QFS thermal behavior to constitute data set;Again, data set is preprocessed, and is divided;Again, the recognition accuracy and generalization ability of different machine learning algorithms to reaction thermal behavior are analyzed and compared, and double-layer BP neural network is selected;Then determine the structure of double-layer BP neural network;Again, the weight and threshold of double-layer BP neural network are optimized using genetic algorithm and bayesian regularization algorithm;Again, confusion matrix is drawn to evaluate the classification performance of double-layer BP neural network;Finally, dimensionless mathematical model and optimized double-layer BP neural network are deployed, simulate and thermal behavior prediction for semi-batch reaction, effectively solve the problem that reaction system thermal behavior identification angle is not comprehensive, with stronger generalization ability and universality.

The invention provides a kilogram-level preparation method of an organic photoelectric conjugated tin reagent, and belongs to the field of organic synthesis and organic photoelectric materials. The method comprises the following steps: in a dry 20L reaction device, dissolving a conjugated thiophene compound in tetrahydrofuran, keeping nitrogen positive pressure protection, dropwise adding a tetrahydrofuran solution of n-butyllithium and a tetrahydrofuran solution of trimethyltin chloride in a low-temperature reaction system, stirring for reaction, after the reaction is completed, standing for phase splitting, collecting an organic phase, drying, and concentrating filtrate to obtain the conjugated thiophene compound. And recrystallizing to obtain the organic photoelectric conjugated tin reagent. According to the method, efficient macro preparation of various conjugated tin reagents can be achieved, 1-1.2 kg of target products can be prepared through single-batch reaction, and the method has the advantages of being high in yield, easy and convenient to operate, low in cost, good in environmental friendliness and the like.

The utility model relates to the technical field of wastewater treatment, in particular to a novel treatment and recycling system for CNC (computer numerical control) machining cleaning wastewater, which comprises a wastewater pretreatment subsystem and a comprehensive wastewater treatment subsystem, the wastewater pretreatment subsystem comprises a wastewater adjusting tank, an air flotation system, a sequencing batch reaction tank and a comprehensive adjusting tank which are connected in sequence; the comprehensive wastewater treatment subsystem comprises a comprehensive regulating tank, an air flotation system, a first reaction tank, a cleaning sedimentation tank, a PH callback tank, an aerobic tank, a biochemical sedimentation tank, an MBR membrane tank, an MBR water producing tank, a security filter, an RO system, a concentrated water collecting tank, a desalination reaction tank and a concentrated water sedimentation tank which are connected in sequence. The utility model aims to provide a novel treatment and recycling system for CNC (computer numerical control) machining cleaning wastewater, which adopts classified collection and corresponding pretreatment for special wastewater, so that the load of a subsequent wastewater treatment process is reduced, and the treatment efficiency is improved.

The present invention discloses a method for rapidly recovering the denitrification performance of a short-range nitrification-anaerobic ammonium oxidation pilot system, relates to the technical field of sewage treatment, and solves the technical problem of a long recovery period after the denitrification performance of a short-range nitrification-anaerobic ammonium oxidation system in the prior art deteriorates. The method comprises: installing a reserve bottle and a metering pump in the short-range nitrification-anaerobic ammonium oxidation pilot system; providing a C6-HSL signal molecule reserve solution to the short-range nitrification-anaerobic ammonium oxidation pilot reactor through the reserve bottle, and providing sludge digestion liquid to the short-range nitrification-anaerobic ammonium oxidation pilot reactor through a water tank; adopting a sequencing batch reaction, each operation cycle includes water intake, pre-anoxic stirring, intermittent aeration, sedimentation, drainage and idleness. The present invention uses actual sludge digestion liquid as the water inlet matrix, and through exogenous addition of C6-HSL signal molecules, artificially regulates the quorum sensing between system microorganisms, thereby accelerating the recovery of the denitrification performance of the side stream short-range nitrification-anaerobic ammonium oxidation pilot system.

Systems and methods are provided for treating, degrading, and incinerating fluorocarbons or fluorinated materials, such as Freon ® with reduced gaseous perfluorinated compound (PFC) emissions. The methods include mixing a fluorinated material with a hydroxide base and optionally a solvent system (e.g., diglyme, polyether, polyether alcohol, polyethylene glycol selected from ethylene glycol and PEG 50 to PEG 3350, N-methyl pyrrolidine, dihydrolevogluton, and / or water ("solvent")) in a batch reactor to form a reaction mixture (also referred to as a suspension). The reaction mixture is heated to a temperature in the range of about 25 °C to about 400 °C for about 0.5 hours to about 240 hours to defluorinate the fluorinated material and produce a defluorinated waste product. More specifically, the methods convert organic fluorine present in the fluorinated material, such as Freon ® to inorganic fluorides. As a result, the defluorinated waste product can be incinerated with reduced harmful gaseous PFC emissions.

The utility model provides a treatment device for recovering copper from electrolytic copper waste liquid, and belongs to the technical field of electrolytic copper waste liquid treatment. Comprising a first adjusting tank, a replacement sequencing batch reaction tank, a plate-and-frame filter press and a second adjusting tank, the copper-containing waste liquid enters the first adjusting tank for aeration treatment and then enters the replacement sequencing batch reaction tank through a pipeline to react with iron powder, and copper-containing sludge generated after the reaction is pumped into the plate-and-frame filter press through a sludge pump for solid-liquid separation. Through the arrangement of the stirring mechanism, the flow guide cover drives the flow guide plate to reciprocate in the aeration process, so that bubbles and waste liquid pass through the flow guide plate in the flow guide cover, the bubbles are better dispersed in the waste liquid through the flow guide plate, the contact area of oxygen in the bubbles and the waste liquid is increased, and the oxidation reaction efficiency in the waste liquid is improved; meanwhile, the water flow can turn over upwards after passing through the guide plate, so that the waste liquid is in full contact with air, the oxidation reaction efficiency in the waste liquid is further improved, and the aeration effect on the waste liquid is improved.

The utility model belongs to the technical field of experimental supplies, and relates to a one-time liquid adding batch reaction detection test tube which comprises a detection test tube and a test tube cover detachably connected with the detection test tube, and further comprises a centrifugal liquid adding structure connected to one side, close to the detection test tube, of the test tube cover. The centrifugal liquid adding structure is positioned in an inner cavity of the detection test tube; the centrifugal liquid adding structure comprises a connecting rod and a centrifugal filtering part, the two ends of the connecting rod are connected with the test tube cover and the centrifugal filtering part respectively to fixedly connect the centrifugal filtering part with the test tube cover, and the length of the connecting rod is smaller than that of the detection test tube, so that after the test tube cover is connected with the detection test tube, the centrifugal filtering part is fixedly connected with the test tube cover. The centrifugal filtering part is located in the middle of the detection test tube, and the centrifugal filtering part is horizontally placed and is used for bearing a detection medicament and enabling the detection medicament to penetrate through the centrifugal filtering part to enter the bottom of the detection test tube under the action of centrifugal force.

The invention discloses a production and preparation optimization method and system for a rubber vulcanization accelerator, and relates to the technical field of production control. The method comprises the following steps: determining a rubber vulcanization system according to vulcanization requirements, and matching and determining the characteristics of an accelerant; according to the characteristics of the accelerant, carrying out optimization decision-making on a compatibility mode and process stage reconstruction, and determining a reconstruction production process; along with the start of production line processing, a reconstruction production process is triggered, micro-fluidic stage control is executed through micro-control cooperation and dynamic combination switching based on an intermittent reaction process, and in-situ separation and purification control is executed through first-order physical screening based on a molecular sieve membrane micro-channel and second-order virtual screening based on a descriptor; and the digital optimization processing control of the accelerant is carried out based on the judgment distribution of the packaging production line and the feedback processing production line. The technical problems of low production efficiency and unstable quality of the rubber vulcanization accelerator in the prior art are solved, and the technical effect of improving the production efficiency and quality is achieved.

The utility model discloses a reaction system for treating potassium permanganate waste liquid and a batch reaction barrel. A potassium permanganate waste liquid discharge pipeline is connected with the batch reaction barrel; the batch reaction barrel is used for conveying completely reacted potassium permanganate waste liquid to the potassium permanganate collecting barrel through a first pipeline; waste liquid in the potassium permanganate collecting barrel is conveyed to the acid-alkali wastewater standing pool through a second pipeline. The batch reaction barrel is provided with a NaHSO3 dosing pump; a floating ball liquid level meter and a stirring device are arranged on the batch reaction barrel; and when the floating ball liquid level meter rises to a specified liquid level, the NaHSO3 dosing pump and the stirring device are started at the same time. The device designed by the utility model can be used for simply and efficiently treating the potassium permanganate waste liquid.

The present application provides are a tire recycling method, a storage medium, an electronic device, and a computer product program. The tire recycling method comprises: acquiring and pre-treating waste tires to obtain waste to be recycled; adding a first set amount of the waste material to be recycled, a first set concentration of a solvent, a second set amount of a functional compound, and a third set amount of a catalyst to a batch reaction kettle and performing a chemical reaction under first set condition to obtain a first product system; and carrying out post-treatment on the first product system to obtain a product, wherein the first set condition comprises: a reaction time of 1 to 6 hours and a reaction temperature of 80ºC to 120ºC, so as to solve the problem in the prior art that it is difficult to use vulcanized rubber as a raw material for a high-performance rubber product due to the breakage of rubber molecular chains and the expansion of the molecular weight distribution after desulfurization.

The invention discloses an immobilized recombinant whole-cell catalyst and a method for preparing gamma-cyclodextrin from the immobilized recombinant whole-cell catalyst. The recombinant whole-cell catalyst is prepared by immobilizing recombinant genetically engineered bacterium whole-cells for expressing a high-selectivity gamma-cyclodextrin glucosyltransferase mutant (the amino acid sequence is as shown in SEQ ID NO: 2) in a calcium alginate carrier matrix through an embedding method. The invention also provides a preparation method of the catalyst and application of the catalyst in preparation of gamma-cyclodextrin by catalyzing starch conversion in multi-batch reaction. The immobilized whole-cell catalyst is simple in preparation process and low in cost, has the high enzyme activity utilization rate of free whole cells and the excellent operation stability of immobilized enzyme, the enzyme activity retention rate is still 85% or above after the immobilized whole-cell catalyst is repeatedly used for 8 times at the temperature of 60 DEG C, and the proportion of a gamma-cyclodextrin product can be kept not lower than 96%.

The present invention relates to a process for treating an aqueous fluid comprising a biodegradable organic substance the process comprising - a bioreactor unit batch feeding stage, wherein the aqueous fluid that is to be treated is fed into a bioreactor unit; - a batch reaction stage, wherein the aqueous fluid is microbiologically treated and biogas is produced in the bioreactor unit; - a degassing unit feeding stage, wherein an aqueous suspension comprising microbiologically treated aqueous fluid and biomass is withdrawn from the bioreactor unit and fed batch-wise into a degassing unit; and - a semi-continuous biomass separator unit feeding stage, wherein the degassed aqueous suspension is withdrawn from the batch degassing unit and fed into a biomass separator.

The utility model provides a standard solution adding, lifting, storing and processing device which comprises a hollow shell, a standard solution adding opening and a connecting opening are formed in a top plate of the shell, a standard solution lifting assembly is arranged in the connecting opening, and a standard solution cleaning opening is formed in the bottom of the side face of the shell. Detachable sealing covers are respectively arranged on the standard solution adding opening and the standard solution cleaning opening. When in use, the treatment device is connected with a full-automatic Kjeldahl apparatus to provide sufficient standard solutions for the inspection process, so that the probability of inspection result distortion caused by incomplete single-batch reaction process due to small storage capacity of the standard solutions is reduced, and the inspection accuracy is improved; meanwhile, frequent liquid adding is avoided, the labor intensity is reduced, and the production efficiency is improved.

The invention provides a pyrazoline continuous production system and method, belongs to the technical field of chemical raw material preparation, and aims to solve the technical problem that pyrazoline cannot be continuously produced. The pyrazoline continuous production system comprises a storage tank, a ketone hydrazine condensation reaction kettle, a membrane separation dehydration device, a batching tank, a tubular reactor and a pyrazoline collection tank which are connected in sequence, the storage tank comprises a ketone storage tank and a hydrazine storage tank which are arranged in parallel; and the batching tank is also connected with a catalyst storage tank. The oil-water mixture is separated by adopting a membrane separation method, the method is simple and easy to implement, low in energy consumption, simple and clear in technical route, high in universality and capable of continuously separating the ketazine / water mixture and continuously producing the pyrazoline product, the pyrazoline yield is greatly improved, and the method is suitable for industrial production. A new thought different from intermittent reaction production is provided for continuous production of pyrazoline.

The invention discloses a continuous reaction system and method for co-producing solid and liquid sodium ethyl xanthate, and relates to the technical field of sodium ethyl xanthate production. The system comprises a reaction kettle, a stirring motor, a raw material discharging pipe, an alkali liquor discharging pipe, a discharging pipe, a circulating liquid outlet pipeline, a centrifugal machine, a drying machine, a xanthate storage tank, a plurality of groups of control valves and a plurality of groups of backflow pipelines, which form a closed-loop reaction and separation system. The method comprises the following steps: feeding ethanol, carbon disulfide and caustic soda liquid with the concentration of more than or equal to 40% according to a molar ratio of 1: (0.9-1.2): (1.0-1.2), carrying out an initial reaction at 30-36 DEG C for 2.5-4.5 h, carrying out circulating separation, mother liquor recycling and continuous alkali supplementation to realize continuous production, and simultaneously producing liquid sodium ethyl xanthate and solid xanthate obtained by drying at 40-60 DEG C for 0.5-2.5 h. According to the method, reaction balance is promoted through high-concentration alkali, the raw material conversion rate is increased, the problem of solid precipitation is solved through the process of reaction-separation-recycling, product diversification is achieved, batch reaction is upgraded to continuous production, the productivity and stability are improved, and different market requirements are met.

The utility model provides a sequencing batch rural domestic sewage treatment device which comprises a tank body provided with a pre-reaction area and a main reaction area, a water inlet pipe is arranged at the upper part of the pre-reaction area, biological stuffing is arranged in the middle of the pre-reaction area, and the bottom of the pre-reaction area is communicated with the main reaction area through a water passing hole; a biological filler is arranged in the middle of the main reaction zone, an aeration device is arranged at the bottom, and sludge in the main reaction zone flows back to the pre-reaction zone through a sludge return pipe and gas stripping of the autonomous reaction zone; the main reaction zone is provided with a drain pipe for gas stripping drainage; the rural domestic sewage treatment device is simple in treatment process flow and small in occupied area and volume, the problem of intermittent discharge of rural domestic sewage can be well solved through sequencing batch reaction, and the rural domestic sewage can be efficiently and stably treated.