81 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 relates to a flame-retardant composition, a flame-retardant layer and a new energy automobile power battery comprising the flame-retardant layer. The flame-retardant composition comprises the following components in percentage by weight: 50-68% of matrix resin which is a mixture of polycarbonate and polyphenyl ether in a weight ratio of (1: 1)-(3: 1); the composite flame retardant comprises a phosphate flame retardant, a cyanamide flame retardant and an inorganic flame retardant according to the weight ratio of 1: (0.5-0.8): (2-2.5), and the inorganic flame retardant is selected from one or more of aluminum hydroxide, antimony trioxide, magnesium hydroxide and zinc borate; 10-20% by weight of a thermally conductive agent; 5 to 10 wt% of a silane coupling agent; and 1-3 wt% of a lubricant. A flame-retardant layer formed by the flame-retardant composition is arranged between a power battery module and an aluminum shell of the new energy automobile power battery, has good flame retardance, heat conduction and mechanical properties, and can meet the use requirements of the new energy automobile power battery.

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

The invention discloses a nitrilase mutant and an application of the nitrilase mutant in synthesis of chiral cyanamide. Compared with an amino acid sequence of wild nitrilase amine, the nitrilase mutant protein has the advantages that the nitrilase mutant protein has a higher amino acid sequence; mutation exists at any one or more of the following amino acid sites corresponding to the amino acid sequence as shown in SEQ ID NO.1: the 54th site, the 118th site, the 120th site, the 139th site, the 148th site, the 168th site, the 170th site, the 194th site, the 197th site, the 198th site, the 202 site and / or the 225th site. The mutant constructed by the method disclosed by the invention can be used for efficiently catalyzing a 3-substituted-glutaronitrile compound to generate an (S)-3-substituted-4-cyanobutyramide compound. According to the invention, the problem of insufficient catalytic activity of the existing enzyme is solved, and an efficient scheme is provided for green synthesis of chiral cyanamide.

The invention discloses a nitrogen / sulfur co-doped porous carbon iron-based composite sodium ion battery negative electrode material and a preparation method thereof. According to the material, chitosan is taken as a carbon source, and the honeycomb-shaped composite carbon material with a hierarchical mesoporous structure is prepared by combining a sodium chloride template method and a two-step calcination process through a double-doping synergistic effect of cyanamine and ferric sulfate. FeS and Fe4 (Fe (CN) 6) 3 active phases are uniformly distributed in the material, FeS and Fe4 (Fe (CN) 6) 3 exist in a heterojunction form, nitrogen is doped in forms of pyridine nitrogen (more than or equal to 50%) and pyrrole nitrogen, and sulfur exists in forms of C-S-C bonds and sulfur oxides. The first efficiency of the material is greater than 90%, the reversible capacity under the current density of 1A / g reaches more than 450mAh / g, the capacity retention ratio after 1000 cycles is greater than or equal to 90%, and the reversible specific capacity under the high rate of 20A / g is still kept more than 150mAh / g. The preparation method comprises the steps of spray drying, two-step calcination and pickling pore-forming. The invention solves the problems of low capacity and poor cycling stability of the existing sodium-ion battery negative electrode material, and is suitable for high-power energy storage equipment.

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 application discloses a calculation method of a reaction mechanism of cyanamide prepared in an alkaline environment and application thereof in byproduct control, and the calculation method comprises the following steps: step 1, constructing a molecular initial model of a reaction system containing a hydroxyl water molecular cluster, performing structural optimization and vibration analysis tasks on the model by using a density functional theory method, and calculating the molecular configuration to obtain a reasonable configuration without virtual frequency; step 2, searching for a reaction transition state based on the reasonable configuration of step 1, and verifying the reasonableness of the transition state; step 3, calculating the free energy in an alkaline aqueous solution environment, and drawing a potential energy surface diagram to determine the reaction rate control step; and step 4, selecting the reaction calculation hydrogen dissociation energy and hydrogen combination energy values of the reaction rate control step containing an intramolecular hydrogen migration process. The calculation method can simulate and calculate phenomena that are difficult to observe by experimental means, obtain reaction information of each elementary reaction process in an actual reaction, obtain the essential law of the reaction mechanism in the alkaline environment, and provide a theoretical reference for process improvement to reduce byproduct generation and promote the selectivity of the main reaction.

To provide a method for producing a pultruded molding, capable of reducing the pultrusion force both before and after curing in a mold, and yielding a pultruded molding with excellent appearance and dimensional precision.SOLUTION: A method of producing a pultruded molding, the method including curing a material that contains components (A)-(D) and meets conditions (I) and (II). [Components] (A) carbon fiber; (B) an epoxy base agent selected from bisphenol A type and bisphenol F type; (C) an epoxy base agent selected from aminophenol type, novolac type, and aliphatic ether type; (D) at least one epoxy curing agent selected from cyanamide type and alicyclic amine type. [Conditions] (I) the volumetric expansion ratio V80 / V25, when the mixture of (B) and (C) is heated from 25°C to 80°C, satisfies a predetermined relational expression; (II) the viscosity increase ratio of the mixture of (B), (C), and (D) after 90 minutes at 25°C is 1.80 times or less.SELECTED DRAWING: None

The present application relates to a flame-retardant composition, a flame-retardant layer and a new energy automobile power battery comprising the flame-retardant layer. The flame-retardant composition comprises: 50-68 wt% of a base resin which is a mixture of polycarbonate and polyphenyl ether in a weight ratio of 1:1-3:1; 15-28 wt% of a composite flame retardant comprising a phosphoric acid ester flame retardant, a cyanamide flame retardant and an inorganic flame retardant in a weight ratio of 1:0.5-0.8:2-2.5, wherein the inorganic flame retardant is selected from one or more of the group consisting of aluminum hydroxide, diantimony trioxide, magnesium hydroxide and zinc borate; 10-20 wt% of a heat-conducting agent; 5-10 wt% of a silane coupling agent; and 1-3 wt% of a lubricant. The flame-retardant layer formed by the flame-retardant composition is arranged between the power battery module and the aluminum shell of the new energy automobile power battery, has good flame-retardant, heat-conducting and mechanical properties, and can meet the use requirements of the new energy automobile power battery.

The present application relates to the technical field of tail gas treatment of pesticide compound production, and particularly relates to a tail gas absorption system in cyanamide methyl formate production process, comprising: a tail gas collecting pipeline, a pretreatment unit, a deep purification unit and a detection device; wherein the pretreatment unit comprises a dust removal tower for cooling and dedusting the tail gas; the deep purification unit comprises an absorption tower made of stainless steel, PPH or glass steel, which is used for purifying the tail gas and treating toxic and harmful substances in the waste gas; the detection device is used for real-time monitoring of tail gas emission indexes to ensure standard emission. The technical scheme can quickly and effectively adsorb and purify the tail gas generated in the cyanamide methyl formate production process, has high adsorption performance, and also has large adsorption capacity and excellent selectivity.

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 invention relates to the field of preparation and purification of 5-aminotetrazole monohydrate, particularly provides a preparation and purification system and method of 5-aminotetrazole monohydrate, and aims to solve the problems that the safety of a production system of 5-aminotetrazole monohydrate is low and large-scale high-purity products are difficult to meet. In order to achieve the purpose, the preparation and purification system comprises a reaction kettle, an organic solvent storage tank, a cyanamide aqueous solution storage tank, a separator, a purification tank and a drying device. The two-phase reaction system and the two-phase reaction method have the advantages of few byproducts in the reaction process, high reaction conversion rate, great improvement of the purity of the product, and suitableness for large-scale industrial production.

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.

A method for preparing guanidino acetic acid involves reacting cyanamide and glycine in an aqueous reaction mixture in the presence of a base. The ammonia content in the reaction mixture is controlled to be below 20 g / L, and the dicyandiatrade content in the reaction mixture is kept below 5 wt.-%.

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 invention belongs to the technical field of chemical engineering, and particularly relates to a creatine monohydrate mother liquor treatment method and system. The method comprises the following steps: firstly, carrying out first resin adsorption on the creatine monohydrate mother liquor to adsorb sodium sarcosinate therein, then carrying out second resin adsorption to adsorb cyanamide derivatives therein, and finally separating sodium ions therein through a bipolar membrane electrodialysis technology. The absorption rate of sodium sarcosinate and cyanamide derivatives is greatly improved, the discharge capacity of waste liquid is obviously reduced, the content of pollutants (COD and ammonia nitrogen) in the waste liquid is obviously reduced, and the method is environmentally friendly. According to the creatine monohydrate mother liquor treatment system disclosed by the invention, efficient recovery and resource utilization of organic matters and inorganic salts in the mother liquor can be efficiently realized, the discharge of wastewater is reduced, and the creatine monohydrate mother liquor treatment system has remarkable environmental protection value and economic benefit.

The invention relates to the technical field of drug impurity detection, in particular to a method for detecting the content of cyanamide in a lamotrigine key intermediate. Respectively dissolving the test sample and the reference substance in a detection solvent to obtain a test sample solution and a reference substance solution; respectively separating the test solution and the reference substance solution by adopting a liquid chromatography technology, detecting by adopting a mass spectrometry detector, and calculating the content of hydrazine by adopting an external standard method according to a peak area; the liquid chromatography conditions are as follows: a C18 chromatographic column is adopted, and the flow rate is 0.5-0.7 ml / min; the column temperature is 30-40 DEG C; the mobile phase is A: 0.1% formic acid aqueous solution; b: acetonitrile; 3%-7% of A and 97%-93% of B are used for isocratic elution; the mass spectrometry conditions are as follows: in an ESI-anion mode, the taper hole voltage is 52V, the parent ion m / z is 274.2, the quantitative ion pair m / z is 274.2 / 257.9, the quantitative ion collision energy is 31V, the qualitative ion pair m / z is 274.2 / 194.0, and the qualitative ion collision energy is 39V. The methodology verifies that the method can be used for quantitatively detecting the content of cyanamide in the lamotrigine key intermediate.

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.

A sintered body containing polycrystalline grains of a metal oxynitride containing at least two metal elements, wherein Ba and at least one metal element of a crystal phase of the sintered body are contained in a triple point that is not a void between the polycrystalline grains. A method for producing the sintered body includes sintering a mixture of at least a metal oxynitride as a main component and a sintering aid containing cyanamide in an atmosphere containing nitrogen or a rare gas or in a reduced-pressure atmosphere of 10 Pa or less while applying a mechanical pressure with a retention time at a maximum heating temperature during the sintering set to 1 minute to 10 minutes.