109 results about "Cyanamide" patented technology

The invention discloses a cyanamide axial coordination cobalt monatomic catalyst for persulfate activation and a preparation method and application thereof, and belongs to the technical field of persulfate advanced oxidation. The catalyst is prepared by the following method: simultaneously adding NH2CN and NaOH into a CoCl2 solution, stirring for reaction, and after the reaction is finished, washing, filtering and drying to obtain the catalyst CoN4 (NCN). The catalyst CoN4 (NCN) with an isolated Co site and cyanamide ([NCN] 2-) coordination structure is synthesized by adopting a one-step precipitation method. The catalyst can be used for an advanced oxidation system based on persulfate activation, and can be used for deeply treating a water body polluted by high-concentration organic matters, so that the biodegradability of the water body is improved. In addition, CoN4 (NCN) also has obvious stability and environmental adaptability, and has important application prospect and value in the field of organic pollutant degradation.

The invention discloses a preparation method of a polymeric cyanamide low-toxicity gold leaching agent, and belongs to the field of hydrometallurgy. The preparation method comprises the following steps: uniformly mixing urea, sodium carbonate and ferrous chloride and finely grinding; then putting the fine grinding material into a high-temperature heating container, gradually raising the temperature, and preserving the heat; gradually cooling the reaction product to room temperature along with the furnace; and finally, a reaction product is crushed and ground into powder, and the polymeric cyanamide low-toxicity gold leaching agent is obtained. The synthetic raw materials of the gold leaching agent are simple, cheap and easy to obtain, the synthetic process is simple and easy to regulate and control, and the synthetic cost is low. The gold leaching agent obtained through the method is low in toxicity, the gold leaching speed is high, the gold leaching rate is high, and leaching tailings are common solid waste and are easier to treat.

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 provides a preparation method of a cyanamide product, which comprises the following steps: S1, mixing a raw material and a preheated solid catalyst, recording the contact time of the raw material and the preheated solid catalyst as T0, recording the uniform temperature reaching time after mixing as T1, and T1-T0 < = 3s; the raw materials comprise urea or mixed gas of ammonia gas and carbon dioxide, the temperature of the urea is less than or equal to 150 DEG C, and the temperature of the mixed gas is 150-450 DEG C; s2, carrying out gas-solid separation on the obtained reaction mixture, recording the time for completing the gas-solid separation as T2, and enabling T2-T1 to be smaller than or equal to 10s; s3, cooling the obtained gas-phase product to below 110 DEG C within F seconds, wherein the temperature is Flt; the method comprises the following steps: 1, obtaining cyanamide products; by adopting the technical scheme provided by the invention, cyanamide and / or dicyandiamide can have relatively high selectivity, so that the content of cyanamide and / or dicyandiamide in the finally obtained cyanamide product is greater than 96%.

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 utility model discloses a cyanamide desolventizing device which comprises a reaction kettle, a rotating pipeline is rotatably connected in the reaction kettle, connecting rods are symmetrically and fixedly connected to the outer side of the rotating pipeline, a scraper blade is fixedly connected to one end of each connecting rod, and a square groove is formed in the reaction kettle and located on one side of the rotating pipeline. A square groove is formed in the reaction kettle, a mounting plate is slidably connected into the square groove, a push block is slidably connected into the mounting plate, a clamping block is fixedly connected to the outer side of the reaction kettle, and a clamping groove matched with the clamping block for use is formed in the push block. According to the cyanamide desolventizing device, the rotating pipeline can be rotated to drive the scraping plate to rotate through the connecting rod, purified water can be sprayed through the through holes in the rotating pipeline, and the inner side wall of the reaction kettle is comprehensively flushed and cleaned.

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.

A method for directionally constructing a non-precious metal catalyst with a high proportion of alloyed diatomic pairs, which relates to a method for preparing a non-precious metal catalyst, is intended to solve the technical problems of low proportion of diatomic pairs and poor catalytic effect in existing diatomic catalysts. This method uses small cyanamide molecules and two transition metal ions to prepare a salt solution pre-anchored with dimetallic ions, then adsorbs the ZIF‑8 powder onto the salt solution, anneals it at high temperature under a protective atmosphere after drying, and obtains a non-precious metal catalyst loaded with a high proportion of alloyed diatomic pairs. The maximum power density of the hydrogen-oxygen proton exchange membrane fuel cell prepared using the catalyst is 1070mW cm in a H2 / O2 environment. ‑2 , the maximum power density in Air / H2 environment reaches 624mW cm ‑2 , which can be used in the field of hydrogen proton exchange membrane fuel cells.

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 invention relates to a creatine monohydrate preparation method, which comprises: S1, carrying out a first reaction on a methylaminoacetonitrile aqueous solution and a first sodium hydroxide aqueous solution to obtain a sodium sarcosinate-containing aqueous solution; s2, carrying out separation treatment on the aqueous solution containing sodium sarcosine in the step S1 by adopting a bipolar membrane electrodialysis device to obtain an aqueous solution containing sarcosine and a second sodium hydroxide solution; and S3, carrying out a second reaction on the aqueous solution containing sarcosine in the step S2 and cyanamide to obtain a crude product containing sarcosine monohydrate. The creatine monohydrate prepared by the preparation method provided by the invention is high in purity and does not contain dicyandiamide and creatinine impurities, and the total yield of the creatine monohydrate is 90% or above.

According to the preparation method, a nitrogen source and an ammonia source are taken as reaction substrates, a metal organic compound is taken as an auxiliary agent, and guanidine carbonate is obtained through reaction. The preparation method comprises the following steps: by taking a metal organic compound MFM-303 (Al) as an auxiliary agent, under the induction of carboxyl and hydroxyl in a pore channel of the MFM-303 (Al), adsorbing and storing ammonia gas released by heating and decomposing an ammonia source or ammonia gas of the ammonia source in the pore channel, and then reacting with a nitrogen source cyanamide, urea or dicyandiamide to obtain guanidine carbonate; high-temperature and high-pressure reaction conditions are not needed, and meanwhile, the use of a large amount of ammonia water in the traditional process is abandoned, so that the industrial production safety is high; the method has the advantages of mild reaction conditions, few side reactions and high product yield, and is beneficial to industrial large-scale production.

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.

This application belongs to the field of drug detection. This application provides a method for detecting cyanamide impurities in drugs, including: successively adding a cyanamide reference substance or a test sample to an alkaline buffer solution and a dansyl chloride solution for derivatization reaction, and then using liquid chromatography tandem chromatography for detection, and calculating the content of cyanamide in the test sample by the standard curve method. The detection method of this application adjusts the derivatization reaction conditions by adding an alkaline buffer solution with a certain pH, making the derivatization product more stable; optimizing the liquid chromatography and mass spectrometry conditions, the resolution and peak shape of the derivatization product are good. The detection method of this application has excellent accuracy, sensitivity and stability, meets the various evaluation indexes of drug impurity detection, and can accurately determine the content of cyanamide impurities in drugs.

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.