45 results about "Cyanamide" patented technology

A method for preparing a positive electrode material and an energy storage battery are provided. The method includes: preparing an Fe-MOF, including: dispersing a first iron source in a solvent, adding the cyanamide organic ligands into the solvent to perform reflux reaction to obtain a reaction solution, and performing cooling, filtering, and cleaning on the reaction solution to obtain the Fe-MOF; grinding and blending the Fe-MOF with a second iron source, a lithium source, and a phosphorus source to obtain a premix; and performing a sintering treatment on the premix under an atmosphere of an inert gas to obtain a composite lithium iron phosphate positive electrode material. The composite lithium iron phosphate positive electrode material includes lithium iron phosphate particles and carbon nanotubes, the lithium iron phosphate particles are attached to a surface of the carbon nanotubes, and there is iron wrapped by each of the carbon nanotubes.

The invention belongs to the technical field of pharmaceutical chemicals, and particularly relates to a method for preparing guanidinoacetic acid from glycine mother liquor. Based on a glycine-cyanamide method, a glycine solution containing iminodiacetic acid is used as one of reaction raw materials. When the method is used for preparing the guanidinoacetic acid, the glycine mother liquor can be directly used for preparing the guanidinoacetic acid, so that the mother liquor is directly treated, the separation step of the glycine mother liquor is omitted, and the process is simplified. Moreover, the method has an unexpected technical effect on the improvement of the yield of the guanidinoacetic acid, and the yield of the guanidinoacetic acid is improved by 6.2-6.4% compared with the prior art.

The invention belongs to the technical field of environmental protection, and particularly relates to a green production process of aminoguanidine carbonate. The method comprises the following steps: inputting hydrazine hydrate and softened water into a premixer, pumping CO2 into the premixer, controlling the pumping pressure of the CO2 at 0.03-0.05 MPa, stabilizing the pH value of a mixed solution at 5.0-5.5, premixing, respectively pumping the premixed solution and a cyanamide aqueous solution into a Taylor-type tubular reactor, arranging CO2 injection ports on the Taylor-type tubular reactor in sections, respectively injecting CO2 through the CO2 injection ports, and respectively injecting the hydrogen cyanamide aqueous solution through the CO2 injection ports. The pH value of the reaction system is kept at 5.0-5.5 for reaction, and reaction liquid is rapidly cooled to 0-5 DEG C through a tubular heat exchanger and then enters a reaction kettle for crystallization; and after the crystallization is finished, filtering, washing and drying the feed liquid to obtain the product aminoguanidine carbonate. According to the method, efficient, safe and controllable industrial production is realized, the yield is high, the CO2 utilization rate is high, the cost is low, the product purity is high, and the crystal particle size distribution is uniform.

This invention discloses a treatment device for wastewater from the production of cyanamide plant growth regulators, including an oxidation tank and a flocculation tank. A detection box is installed on one side of the bottom of the oxidation tank. This invention targets the oxidation and precipitation treatment process of cyanamide wastewater, dividing the wastewater into oxidation and flocculation tanks. The main oxidation and precipitation treatment is carried out in the oxidation tank. A rotary jet agitator is installed at the upper end of the oxidation tank, using the wastewater flowing into the oxidation tank as a circulation carrier to uniformly spray the synchronously supplied oxidant into the oxidation tank through the jet agitator. This is beneficial to improve the reaction effect between the oxidant and the wastewater. By combining wastewater information with a preset dosage ratio model, the theoretical dosage of the agent is obtained. The oxidant is added in a "precise", "dynamic", and "intelligent" manner by combining addition and ORP monitoring feedback, avoiding the problems of excessive oxidant or incomplete treatment that may occur with traditional fixed addition methods.

The invention belongs to the technical field of organic synthesis, and relates to a preparation method of cimetidine, in particular to a process for synthesizing cimetidine through continuous flow reaction. According to the process, cyanamide and methyl isocyanate are taken as initial raw materials and are accurately pumped into a microchannel continuous flow reactor according to a certain molar ratio, and the N-cyano-N '-methylurea intermediate is efficiently and controllably synthesized at a specific temperature. And then, synchronously pumping a 2-(((5-methyl-1H-imidazole-4-yl) methyl) sulfo) ethyl-1-amine hydrochloride solution and the N-cyano-N '-methylurea intermediate into a subsequent continuous flow reaction module, introducing the reaction liquid into an online drying device with a molecular sieve in real time, and promoting efficient nucleophilic addition reaction through continuous water removal, thereby obtaining the N-cyano-N'-methylurea intermediate. Finally, the cimetidine is obtained at a high yield. The method has the outstanding advantages of mild conditions, high yield, stable product quality, easiness in large-scale amplification and the like, and is a new generation of cimetidine preparation technology which is green, safe and efficient and has important industrial application value.

The invention relates to application of a polycyclic quinazolinone compound in resisting plant pathogenic fungi in the technical field of organic synthetic chemistry and agricultural pharmacology, the structural formula of the derivative is shown as I or II, in the structural formula, R is H, 4-OMe, 4-Me, 4-CO2Me, 4-F, 4-CF3, 4-Cl, 4-Br, 2-Br or 2-F, and R is H, 4-OMe, 4-Me, 4-CO2Me, 4-F, 4-CF3, 4-Cl, 4-Br, 2-Br or 2-F; the series of compounds have a certain inhibition effect on plant pathogenic fungi including strawberry botrytis cinerea, fusarium graminearum, rhizoctonia solani and magnaporthe oryzae, and can be applied to plant protection as a bactericide. The preparation method comprises the following steps: by taking N-cyanamide olefin as a raw material and lauroyl peroxide as an oxidizing agent, reacting in a dichloromethane or trichloromethane solvent at 80-120 DEG C to obtain the polycyclic quinazolinone compound with antibacterial activity. The preparation method is simple to operate, green and efficient.

The present application belongs to the technical field of melamine tail gas treatment, and particularly relates to a purification method and system for melamine production tail gas. The purification method for melamine production tail gas provided by the present application is for tail gas generated in the production of melamine by the gas phase method. The tail gas is sequentially subjected to molten urea washing, ammonia water washing, and then urea hydrolysis treatment, to obtain pure tail gas containing only ammonia and carbon dioxide. The present application has the beneficial effect that, after the tail gas is washed by molten urea and ammonia water and further treated by urea hydrolysis, the melamine, melamine acid, biuret, urea, isocyanic acid, cyanamide and other components originally contained in the tail gas only contain pure CO2 and NH3 after purification, the purification degree of the tail gas is very high, and the obtained tail gas can be directly applied to the production of fine chemical products.

The utility model relates to a water pretreatment system for cyanamide low-temperature hydrolysis reaction. The water pretreatment system comprises filtering equipment for filtering impurities in water, neutralizing equipment for adjusting the pH value of the water and a water storage tank, a first water outlet pipe of the filtering equipment is communicated with a second water inlet pipe of the neutralizing equipment through a first connecting pipe; a first water pump is mounted on the first connecting pipe; a second water outlet pipe of the neutralization equipment is communicated with a third water inlet pipe of the water storage tank through a second connecting pipe; a second water pump is mounted on the second connecting pipe; a first three-way pipe fitting is connected to a first water inlet pipe of the filtering device, a second three-way pipe fitting is connected to a third water outlet pipe of the water storage tank, one port of the first three-way pipe fitting is communicated with one port of the second three-way pipe fitting through a third connecting pipe, and a third water pump is installed on the third connecting pipe. Impurities in industrial water are filtered through the filtering device, the purity of the industrial water is improved, the PH of the industrial water is neutralized through the neutralizing device, and the production quality of cyanamide is guaranteed.

The present application relates to the technical field of plant cultivation, and especially relates to a single-cyanamide agricultural plant growth regulator quantitative coating device, which comprises a medicine storage cylinder, the bottom of the medicine storage cylinder is fixedly connected with a quantitative pipe, one side of the quantitative pipe is fixedly connected with a conical hopper, and the quantitative pipe and the conical hopper are respectively provided with an adjustable medicine pushing assembly and a movable coating assembly; the present application realizes the effect of adjusting quantitative liquid discharge treatment according to the coating requirement, combines the movable coating assembly, recycles the residual liquid on the brush, avoids the waste caused by dripping during the quantitative liquid feeding process, and can realize fast and accurate quantitative filling, and avoid affecting the discharge amount caused by pushing part of the single-cyanamide into the air pipe.

This invention belongs to the technical field of organic synthesis and discloses a method for preparing cyanamide and thiols. The method involves reacting arylthiourea with a haloalkane in the presence of a base or a base and a copper salt using an aprotic organic solvent as the reaction medium to obtain cyanamide and thiols; the structure of the arylthiourea is Formula IV, and the structure of the cyanamide is Formula I. The method of this invention is simple to operate, operates under mild conditions, and can rapidly and efficiently obtain structurally diverse cyanamide and thiols, exhibiting high functional group compatibility.

The application provides a method for preparing a carbon-based negative electrode material for a lithium ion battery by using cyanamide waste residue and application, and the method comprises the following steps: dispersing and dissolving cyanamide waste residue and a carbon source in an ethanol solution in proportion and mixing thoroughly; then, the mixed solution is dried to remove ethanol, calcium carbonate in the cyanamide waste residue is used as a structure directing agent, the carbon source is used as a carbonization precursor, and carbonization is completed through calcination; finally, the calcination product is subjected to acid extraction treatment through a hydrochloric acid-hydrofluoric acid mixed acid solution, and is washed with water until neutral, so that a composite carbon material of waste residue carbon coupling nanometer ring-shaped microcrystalline carbon, i.e., a carbon-based negative electrode material for a lithium ion battery, is obtained. The application also provides application of the carbon-based negative electrode material in a lithium ion battery. The application realizes resourceization and high-value treatment of solid waste by efficiently utilizing cyanamide waste residue, and the obtained carbon-based negative electrode material has the advantages of high performance, low cost and the like, has environmental benefits and economic benefits, is suitable for a lithium ion battery negative electrode, and has a wide application prospect.

The present invention relates to a process for the preparation of N-cyanothioimine compounds and derivatives thereof, such as N-cyanosulfoximine. In particular, it has been found that N-cyano thioimine compounds can be prepared by mixing a thioether compound (i), a cyanamide (ii) and an oxidizing agent (iii) in a solvent in the presence of a compound (iv) comprising an alkali metal hydroxide, a bicarbonate, a mixture of bicarbonate and carbonate and / or a mixture of phosphate, therefore, the production yield of the N-cyano thioimine compound is increased.

The application belongs to the technical field of inorganic semiconductor heterogeneous catalysis, and relates to a composite material for photo-thermal synergistic catalysis of CO2 cycloaddition reaction and preparation and application thereof, and comprises the following steps: taking two different alkali metal chlorides, then taking urea with a mass ratio of 3:5 to the alkali metal chlorides to obtain a precursor of alkali metal high-crystalline carbon nitride; taking zinc nitrate hexahydrate and grinding and uniformly mixing the zinc nitrate hexahydrate and the precursor of alkali metal high-crystalline carbon nitride according to a mass ratio of 1:(1-20), and then heating the obtained precursor to 550 DEG C under a nitrogen atmosphere, reacting for 2-5 h to obtain the composite material. The alkali metal high-crystalline carbon nitride and the cyanamide metal compound hetero-composite material prepared by the one-step method have good catalytic performance in photo-thermal synergistic catalysis of CO2 cycloaddition reaction under relatively mild conditions, the performance of the composite material does not obviously decrease after being recycled for multiple times, the stability is good, the recovery is simple, and the performance is still relatively excellent under industrial simulation gas experiment.

The invention relates to a low-melting-point dihydroxy heterocyclic onium cyanide-containing ionic liquid and a preparation method thereof, and the main method comprises the following steps: carrying out quaternization reaction on monohydroxy substituted heterocyclic onium and a dihalogenated hydrocarbon structure to obtain corresponding dihalogenated heterocyclic onium salt; furthermore, silver dicyandiamide, tricyanomethanesilver and silver thiocyanate are subjected to anion exchange reaction in a solvent, and the dihydroxyl heterocyclic onium ionic liquid compounds containing different cyanide anions are prepared. A dihydroxyl structure is introduced into a heterocyclic onium structure, cyanide-containing anions with charge delocalization and weak coordination are provided, lattice energy is reduced, and the melting point of a system is reduced through interaction of intermolecular hydrogen bonds; meanwhile, nitrogen-containing cations and cyanide-containing anions are combined to form an ionic liquid compound with high carbon yield. The ionic liquid can be used as an electrolyte solvent / additive, a flame-retardant plasticizer or a cellulose dissolving medium and the like, contains dihydroxyl, and can participate in polymer synthesis as a functional group. The material is mild in preparation process condition, short in reaction period, simple in reaction and few in by-product, and has the advantages of being green and capable of being amplified.

The application discloses a kind of dynamics calculation method, dynamics calculation model and application of lime nitrogen method process preparation cyanamide, the dynamics calculation method includes the following steps: step 1, construct reaction system molecular initial model;Step 2, structure optimization and vibration analysis are carried out to molecular initial model;Step 3, transition state search is carried out to reaction path;Step 4, the free energy of solute molecule in aqueous solution environment is calculated;Step 5, reaction kinetics and thermodynamic parameter calculation.The dynamics calculation model of lime nitrogen method process preparation cyanamide of the application reveals the microcosmic reaction mechanism of lime nitrogen method process, obtains Arrhenius kinetics equation, and reaction activation energy, pre-exponential factor and other key kinetic parameters, chemical reaction information such as intermediate, transition state that cyanamide generates experiences, forms theoretical support for the reaction process optimization improvement of lime nitrogen method, provides process parameter design basis for the optimization of equipment and plant scale system optimization.

A method for producing a catalyst material for an electrode of an electrochemical cell includes doping a carbon material with nitrogen atoms, where the doping includes: bringing a carbon material into contact with urea at a temperature in a temperature range from 750° C. to 850° C.; bringing an oxidized carbon material into contact with cyanamide at a temperature in a temperature range from 550° C. to 650° C.; or bringing an oxidized carbon material into contact with melamine at a temperature in a temperature range from 550° C. to 650° C.

The utility model relates to carbon dioxide supply equipment for cyanamide hydrolysis, which comprises a liquid carbon dioxide storage tank, a first constant-pressure pump, a gasification tank and a second constant-pressure pump, and a carbon dioxide outlet of the liquid carbon dioxide storage tank is communicated with an input end of the first constant-pressure pump through a first pipeline. The output end of the first constant pressure pump is communicated with the carbon dioxide inlet of the gasification tank through a second pipeline, the carbon dioxide outlet of the gasification tank is communicated with the input end of the second constant pressure pump through a third pipeline, and the output end of the second constant pressure pump is connected with a fourth pipeline used for conveying carbon dioxide into the cyanamide hydrolysis kettle; a pressure increasing valve, a first pressure sensor and a pressure release valve are sequentially installed on the fourth pipeline in the carbon dioxide output direction. According to the utility model, the stability and efficiency of carbon dioxide supply are improved, energy in the supply process is effectively utilized, and the utilization rate of energy resources is improved.

The invention discloses a high-specific-surface-area nitrogen-doped lignin mesoporous carbon sphere as well as a preparation method and application thereof. The method comprises the following steps: firstly, carrying out solvothermal reaction on a cyanamide nitrogen source calcined product to prepare soluble g-C3N4, and then sequentially adding a weakly acidic potassium acrylate aqueous solution and a soluble g-C3N4 aqueous solution into a lignin organic solvent / water mixed solution under an ultrasonic condition to obtain g-C3N4-lignin / potassium acrylate supramolecular spheres; and directly carbonizing the obtained supramolecular spheres to prepare the nitrogen-doped lignin mesoporous carbon spheres with high specific surface area. The method is simple, does not need corrosive chemical reagents, and can be applied to large-scale production; the high specific surface area provides abundant ion adsorption sites, and the electric double-layer capacitance is remarkably improved; the high nitrogen doping can introduce pseudocapacitance with the capacity being more than five times of that of an electric double-layer capacitor, so that the specific capacitance of the mesoporous carbon sphere is effectively improved; and the mesoporous structure is integrated, so that the transmission of hydrated zinc ions is accelerated, and the rate capability is effectively improved.

This invention relates to a method for the efficient preparation of methyl cyanurate, belonging to the technical field of pharmaceutical intermediate synthesis. The method includes the following steps: mixing 1-hydroxyethyl-3-methylimidazolium acetate with a 28-32% potassium phosphate aqueous solution at a mass ratio of (2.8-3.2):1, followed by allowing the mixture to stand and separate into upper and lower phases; adding a cyanamide aqueous solution to the lower phase; and continuously adding methyl cyanurate to the upper phase; stirring the reaction at 40-50°C for 1.5-2.5 hours; allowing the mixture to stand and separate into upper organic and lower brine phases; diluting the upper organic phase with 1.8-2.2 times its volume of deionized water, precipitating a solid, followed by filtration; collecting the filter cake and filtrate; washing and drying the filter cake to obtain methyl cyanurate. This invention achieves directional distribution of reactants, precise suppression of side reactions, and efficient separation of products by constructing a two-phase aqueous system.

The application discloses a preparation method and application of a FeOOH quantum dot modified amino-rich porous ultrathin graphite phase carbon nitride (g-C3N4) nanosheet high-efficiency photo-Fenton water purification material, and belongs to the technical field of functional nanomaterial preparation, solar energy utilization and environmental protection. The preparation method of the material is as follows: a commercial nitrogen-rich precursor (cyanamide, dicyanodiamide or melamine) and a high-molecular structure directing agent (CTAB, P123 and polyethylene glycol) are used as raw materials, uniformly mixed, directly calcined in air, and then subjected to chemical etching treatment to prepare an amino-functionalized porous ultrathin g-C3N4 material (AHUCN). Then, FeOOH quantum dots are loaded on the surface of the AHUCN material by using a coprecipitation method, so that a FeOOH@AHUCN photocatalytic material is obtained. The method is simple and easy to implement, and low in cost; the prepared material can be applied to photo-Fenton purification of antibiotic pollutants in water under sunlight, and has an important application prospect.

The invention discloses a three-year five-cropping continuous fruiting cultivation method for large cherries, which relates to the technical field of cherry cultivation, and comprises the following steps: forced cold dormancy management, thorough watering before a dormancy period, and cooling by stages through intelligent refrigeration equipment; management in a temperature rise period: spraying a 60-80-fold solution of 50% cyanamide before temperature rise, and carrying out temperature rise in stages; performing flower and fruit management, namely artificially dotting flowers for three times in the flowering period at intervals of 11-12 days and 7 days; fruit thinning and pinching are carried out after flowers fall, thorough watering and balanced fertilizer applying are carried out in the core hardening period, high potassium fertilizer is applied in the color changing period, the temperature is reduced by 2 DEG C before harvesting, and the temperature and humidity in the flower and fruit management stage are controlled to be 24-26 DEG C in the germination period and 70-80% in the humidity. The method has the advantages that by integrating intelligent temperature and humidity regulation and control, precise tree body management and a full-period fertilizer and water cooperation technology, the limitation that large cherries are ripe one year in a traditional facility is broken through, three-year five-cropping continuous fruiting is achieved, the yield per unit area is remarkably increased, and the economic benefit period is prolonged.

A laundry detergent composition including from 0.01% to 10%, by weight of the composition, of a dye fixative wherein said dye fixative is selected from the group consisting of reaction products of polyamines with cyanamides and acids, reaction products of cyanamides with aldehydes and ammonium salts, reaction products of cyanamides with aldehydes and amines, or reaction products of amines with epichlorohydrin; and any combination thereof, and from 0.01% to 10%, by weight of the composition, of an amine oxide.

The utility model relates to a cyanamide hydrolysis kettle cooling system which comprises a reaction kettle, an outer jacket is fixedly connected to the outer wall of the reaction kettle, a closed heat exchange cavity is formed between the outer jacket and the reaction kettle, a medium input pipe is arranged at the bottom of the heat exchange cavity, and a medium output pipe is arranged at the top of the heat exchange cavity; two first partition plates distributed up and down are fixedly connected into the cooling box, an inner cavity of the cooling box is divided into a cooling chamber, a filtering chamber and a water storage chamber from top to bottom in sequence through the two first partition plates, the cooling chamber is provided with a circulation input pipe, the medium output pipe is communicated with the circulation input pipe through a first water pump, and the water storage chamber is provided with a circulation output pipe; the medium input pipe is communicated with the circulating output pipe through a second water pump. The cooling medium exchanges heat with the reaction solution in the heat exchange cavity, enters the cooling box through the first water pump to be cooled, and then is conveyed into the heat exchange cavity again through the second water pump to exchange heat to form circulating heat exchange cooling, so that the cooling requirement in the cyanamide production process is met.

The utility model belongs to the technical field of chemical engineering, and particularly relates to a creatine monohydrate mother liquor treatment system which comprises a first resin tower group, a second resin tower group and a bipolar membrane electrodialysis device. A first mother liquor discharge pipe of the first resin tower group is connected with an inlet of the second resin tower group, and a second mother liquor discharge pipe of the second resin tower group is connected with an inlet of the bipolar membrane electrodialysis device. Sodium sarcosinate in mother liquor is adsorbed by adopting a first resin tower group, cyanamide derivatives in the mother liquor are adsorbed by adopting a second resin tower group, NaCl in the mother liquor is decomposed into NaOH and HCl by adopting a bipolar membrane electrodialysis device, and regenerated NaOH and HCl are respectively reused for resin desorption and production processes. And efficient recovery and resource utilization of organic matters and inorganic salts in the mother liquor are efficiently realized, the discharge of wastewater is reduced, and the method has remarkable environmental protection value and economic benefit.

A cyanuric acid / cyanamide complex based on hydrogen bond competition and solvation effect, a preparation method and applications thereof belong to the technical field of nanomaterials, and the cyanuric acid / cyanamide complex based on hydrogen bond competition and solvation effect is obtained through hydrogen bond self-assembly reaction and surface modification of cyanamide, cyanuric acid, a polar solvent, a water-soluble carbonyl compound and a strong hydrogen bond donor polymer; after the complex is added into nylon 66 at an addition amount of 6 wt%, the tensile strength of the nylon 66 is 78.4-84.5 MPa, the bending strength is 116.7-123.5 MPa, the bending modulus is 2.9-3.3 GPa, the notched impact strength is 10.8-15.7 kJ / m 2 , the limiting oxygen index is 33.5-36.5%, the UL-94 V flame retardant grade reaches V-0 grade, and the anti-migration performance is excellent.

The application discloses a preparation method of a naphthomostat mesylate impurity standard substance, and specifically comprises the following steps: firstly, reacting m-aminobenzoic acid with a hydrochloric acid solution to obtain an m-aminobenzoic acid hydrochloride solution; then, adding a magnetic solid acid catalyst and a 20-30% mass concentration cyanamide aqueous solution, and stirring and reacting at room temperature under a pulse magnetic field to obtain 3-guanidinobenzoic acid hydrochloride; then, adding 3-guanidinobenzoic acid hydrochloride, 6-amidino-2-naphthol mesylate, N,N'-dicyclohexyl carbodiimide and a supported catalyst into pyridine, stirring and reacting at room temperature to obtain 6-amidino-2-naphthyl-3-guanidinobenzoic acid ester; and finally, salifying to obtain 6-amidino-2-naphthyl-3-guanidinobenzoic acid ester mesylate. The 6-amidino-2-naphthyl-3-guanidinobenzoic acid ester mesylate with high purity and high yield obtained by the application is of great significance for the quality research of naphthomostat mesylate.

The application belongs to the technical field of synthesis, and particularly relates to a synthesis method of urea 14 C]. The synthesis method of urea 14 C] comprises the following steps: (1) reacting carbonate 14 C] with ammonia to obtain cyanamide salt 14 C]; (2) hydrolyzing the cyanamide salt 14 C] obtained in step (1) with concentrated sulfuric acid, and the hydrolysis temperature is 35-45 DEG C; (3) adjusting the pH of the hydrolysis product obtained in step (2) with ammonia water, and concentrating and purifying to obtain urea 14 C]. The synthesis method has the advantages of mild conditions, high reaction efficiency, high product yield (up to 95% or more), high purity (chemical purity is greater than or equal to 99%), and is suitable for large-scale preparation of key raw materials of a Helicobacter pylori diagnostic reagent.

This invention relates to the field of feed additive preparation technology, and proposes a method for preparing ethyl guanidine hydrochloride, comprising the following steps: S1, dissolving glycine ethyl ester hydrochloride in a solvent, adjusting the pH to 10-11 at 0-5°C using an alkaline adjuster to obtain a reaction solution containing free glycine ethyl ester; S2, adding a cyanamide aqueous solution to the reaction solution containing free glycine ethyl ester at 0-5°C, and reacting at 55-80°C to obtain a reaction solution; S3, after cooling the reaction solution, adjusting the pH to 6-7 using an acidic adjuster, precipitating a solid, which is then filtered and washed to obtain crude ethyl guanidine hydrochloride; S4, recrystallizing the crude ethyl guanidine hydrochloride to obtain ethyl guanidine hydrochloride. This technical solution solves the problems of low yield and low purity of ethyl guanidine hydrochloride in related technologies.

The present application relates to the technical field of industrial fungicide, in particular to a kind of bactericide for injection water treatment and preparation method thereof.The preparation method includes the following steps: 2,4-imidazoline diketone is reacted with 3-chloropropionaldehyde, and 5-chloropropenyl-2,4-imidazoline diketone is prepared;5-chloropropenyl-2,4-imidazoline diketone is reacted with 1,4-dibromobutane, and 3-bromobutyl-5-chloropropenyl-2,4-imidazoline diketone is prepared;2-(4-aminophenyl)-5-aminobenzimidazole is reacted with hydrochloric acid and cyanamide, and imidazole guanidine salt is prepared;3-bromobutyl-5-chloropropenyl-2,4-imidazoline diketone is reacted with imidazole guanidine salt, extract of phellodendri chinensis and extract of sophora flavescens, to obtain the bactericide for injection water treatment.The bactericide for injection water treatment not only has excellent bactericidal performance, can effectively inhibit and kill sulfate-reducing bacteria, saprophytic bacteria and iron bacteria, but also has good corrosion inhibition performance.

The utility model relates to the technical field of chemical production, in particular to an automatic reaction device for a dicyandiamide polymerization procedure, which comprises a reaction kettle main body, a PLC (programmable logic controller) control box is fixedly mounted at the bottom end of the reaction kettle main body, a feeding pump is fixedly mounted on the side wall of the reaction kettle main body, and a suction pipe is communicated with the side wall of the feeding pump. And a feeding pipe is arranged at the top end of the feeding pump in a communicating manner. According to the reaction kettle, a cyanamide solution in the reaction kettle main body can be stirred, the temperature of the cyanamide solution can be uniformly absorbed, the heating efficiency of the cyanamide solution can be improved, the production efficiency can be further improved, automatic control can be realized by matching the temperature monitor, the PH monitor and the liquid level sensor with the PLC control box, and the production efficiency is improved. And the waste gas treated by the waste gas treatment box can be exhausted along the exhaust pipe, so that the emission of harmful gas is effectively reduced, the working environment is improved, and the safety of workers is facilitated.