76 results about "Cyanogen" patented technology

The utility model discloses a thermal hydrolysis cyanide breaking device, which relates to the technical field of wastewater treatment and comprises a cyanide breaking reactor, a wastewater heat exchanger, a pipeline mixer, a steam mixer, an instrument control valve and the like. After being heated by the wastewater heat exchanger, the wastewater enters a cyanide breaking reactor, and steam enters a steam mixer to heat the wastewater to a specified temperature and then enters the cyanide breaking reactor. The characteristic that the cyanide aqueous solution is easy to hydrolyze is utilized, so that the cyanide aqueous solution is hydrolyzed at the temperature of higher than 140 DEG C to produce sodium formate and ammonia, the toxicity of cyanide is eliminated, high-temperature wastewater discharged from the cyanide breaking reactor enters the wastewater heat exchanger to exchange heat with wastewater to be treated, and heat is recovered; the pressure of the reactor is controlled through a wastewater heat exchanger outlet wastewater outlet pipeline pressure regulating valve. The cyanide wastewater treatment device is reasonable in design, only a small amount of sodium hydroxide is needed for adjusting the pH of wastewater, no chemical agent needs to be added in other procedures, the cyanide wastewater treatment efficiency is improved, and the cost is saved.

The invention provides a method for recycling valuable substances and cyanide in cyanide-containing wastewater, and belongs to the technical field of cyanide-containing wastewater treatment. The method comprises the following steps: firstly, carrying out replacement reaction on a physicochemical material (reducing substance zinc) and a copper-cyanogen complex in the cyanogen-containing wastewater to displace copper, and filtering to obtain filter residues containing zinc and copper, so as to realize copper recovery; in the replacement reaction, the copper-cyanogen complex in the filtrate is converted into a zinc-cyanogen complex with a lower stability constant, and then the zinc in the filtrate is recycled by diaphragm electrolysis. The method specifically comprises the following steps: dividing an electrolytic cell into a cathode region and an anode region by utilizing a membrane material, and enabling electrode reactions to be independently carried out, so that cyanide is prevented from entering the anode region to generate electrochemical oxidation and the decomposition of the cyanide is inhibited, and the cyanide is recycled in a solution for cyclic utilization; and then an alkali-resistant titanium-based coating electrode is used as an anode plate, a porous material is used as a cathode plate, recovery of zinc on the cathode plate is promoted, and recovery of valuable metal zinc and copper and cyclic utilization of cyanide are achieved.

The embodiment of the invention relates to the photovoltaic field, and provides a cyanide-free electroplating silver-coated copper conductive material, a preparation method thereof and a crystalline silicon solar cell. The silver-coated copper electrode provided by the embodiment of the invention comprises a copper core and a copper-tin alloy electroplated layer coated on the surface of the copper core, the surface of the pre-plating material is coated with the silver electroplating layer; the surface of the silver-coated copper material is coated with the self-repairing layer; wherein the self-repairing layer comprises a resin film and a pH response type microcapsule, the microcapsule is embedded in the resin film, and the microcapsule is filled with an ammonium molybdate corrosion inhibitor. The copper-silver interface bonding force can be improved through the copper-tin alloy electroplated layer, and the silver layer material does not contain cyanogen and is environmentally friendly; the corrosion inhibitor in the pH response type microcapsule in the self-repairing film layer on the surface of the silver layer is released under a specific pH condition to form a protection film on the silver layer again, so that the self-repairing purpose is achieved, and the dynamic protection effect is achieved.

The invention relates to an efficient copper removal and recycling process for copper-cyanogen complex wastewater, which comprises the following steps: (1) critical acidification-selective crystallization of the copper-cyanogen complex wastewater: directionally recombining a copper-cyanogen complex to generate insoluble CuCN crystals by accurately regulating and controlling the pH value of the wastewater; (2) rotational flow enhanced crystallization: separating CuCN crystals from overflow liquid through a hydrocyclone; (3) gradient activation of a composite vulcanizing agent for deep copper removal: enabling the fine CuCN particles and the dissolved-state low-coordination copper-cyanogen complex to react to generate insoluble CuS crystals by adjusting the pH value and adding the composite vulcanizing agent; and (4) magnetic seed enhanced separation: carrying out magnetic separation by adopting modified magnetic seeds and a low-intensity magnetic separator, separating CuS magnetic flocs from the wastewater, and finally obtaining purified tail liquid. According to the closed-loop process, copper in the copper-cyanogen complex wastewater can be efficiently removed and recovered, the purified tail liquid can be reused for cyanidation leaching operation, the unit consumption of sodium cyanide is remarkably reduced, the leaching rate of gold and silver is increased, and zero discharge of wastewater and full recovery of copper resources are truly achieved.

The invention provides an up-to-standard treatment method for wastewater containing ammonia nitrogen and difficult-to-treat copper-cyanogen, and belongs to the field of wastewater treatment.The wastewater enters a first-stage oxidation reactor at first, the stable structure of a copper-cyanogen complex is destroyed by adding an oxidizing agent, then a copper removal agent and a pH adjusting agent are added into a copper removal reactor, copper ions are precipitated and separated out, and then the wastewater enters a second-stage oxidation reactor; the method comprises the following steps: carrying out oxidation and solid-liquid separation to remove copper sludge, carrying out oxidation and solid-liquid separation on treated overflow liquid and press filtrate after convergence so as to thoroughly remove residual cyanide and organic matters, and finally, conveying purified liquid which is subjected to two-stage oxidation and is subjected to copper cyanide interference removal to a biological reaction system to carry out biochemical reaction. And finally, the effluent reaches the recycling or discharging standard. The method effectively solves the problem of toxicity inhibition of difficult-to-treat wastewater on a biochemical system, realizes step-by-step removal and resource utilization of toxic and harmful substances, ensures stable and up-to-standard reuse or discharge of effluent, and has the advantages of efficient treatment, economy, environmental protection and convenient operation.

The application discloses a kind of hydrolysis-resistant acetylacetamide modified polyvinyl alcohol and preparation method thereof, and the preparation method comprises the following steps: double vinyl ketone and first and alcohol amine compound are reacted to generate N-(hydroxyalkyl) acetylacetamide intermediate;Then trichloro cyanogen and N-(hydroxyalkyl) acetylacetamide intermediate are reacted to generate 3,5-bis[acetylacetamide alkoxyl] monochloro s-triazine;Finally, 3,5-bis[acetylacetamide alkoxyl] monochloro s-triazine is reacted with PVA in polar solvent to generate AAM-PVA.The AAM-PVA prepared in the application can be used as a protective colloid for polyvinyl acetate emulsion polymerization, and the prepared emulsion adhesive has obvious improvement in water resistance, tensile strength and stability;The raw materials of the application are cheap and easy to obtain, the preparation process is simple, the reaction conditions are mild, and there is no waste water and waste gas emission.

The utility model provides a biomass methanol sewage treatment device which comprises the following steps: S1, gasification wastewater, ground flushing water, methanol rectification wastewater, test wastewater and domestic sewage are generated in a biomass methanol production process; carrying out oil removal, two-stage air flotation reaction, deamination reaction, coagulation cyanogen breaking and Fenton pre-oxidation treatment on the gasified wastewater to obtain pretreated gasified wastewater; s2, performing comprehensive treatment on the ground flushing water, the methanol rectification wastewater, the test wastewater, the domestic sewage and the pretreated gasification wastewater. The biomass methanol wastewater treatment system has the beneficial effects that the high-concentration gasified wastewater is pretreated by adopting classified and quality-divided treatment, the pretreated wastewater is biodegradable wastewater, and a comprehensive treatment process which mainly adopts biochemical treatment and is high-grade oxidation security is adopted, so that the treatment cost of the biomass methanol wastewater is reduced, and the effluent is ensured to reach the emission standard of pollutants in the petrochemical industry.

The utility model discloses a low-cost device for treating high-concentration cyanide-containing wastewater, which comprises a first wastewater delivery pump (1), a primary reaction tank (4), a secondary reaction tank (6), a regulating tank (7) and a second wastewater delivery pump (8) which are sequentially connected, the primary reaction tank (4) is connected with a special cyanide breaking device (2) through a pipeline, and the regulating tank (7) is connected with a NaOH solution storage tank (3) through a pipeline. According to the method disclosed by the utility model, the oxidizing agent is prepared by adopting the special cyanide breaking device, the strong oxidizing property of the oxidizing agent is utilized, the cyanide breaking reaction is carried out on the high-concentration cyanide-containing wastewater treatment device, and the wastewater can stably reach the standard without adjusting the pH value of the wastewater on the basis of not changing the original treatment device.

The application discloses the use of carbon cyanogen - 4 trifluoromethoxy benzyl hydrazone in the prevention and treatment of candida infection, belonging to the technical field of candida infection prevention and treatment. Carbon cyanogen - 4 trifluoromethoxy benzyl hydrazone is used as the only active ingredient for preparing a medicine for preventing or treating diseases caused by candida infection, wherein the candida is candida albicans and / or candida auris; or it is used for preparing a bacteriostatic and / or bactericidal product of candida, wherein the candida is candida albicans and / or candida auris. FCCP shows good inhibition of strain growth, good inhibition of biofilm effect and good mitochondria breaking effect in the antibacterial experiments of various candida (wild type candida albicans, drug resistant candida albicans and drug resistant candida auris). Thus, a new treatment drug for candida albicans and candida auris infection is provided.

The invention relates to the field of polyacrylate photoresists, in particular to a photoresist film-forming resin raw material and a preparation method thereof.The preparation method comprises the steps that cyclopentadiene is dropwise added into a mixed solution of alpha-bromomethyl acrylate and a solvent, the temperature is controlled, a reaction is conducted for 4 h, and 5-bromodicyclohept-2-ene-5-carboxylic acid methyl ester is prepared; the preparation method comprises the following steps: adding alkali into 5-bromo dicycloheptyl-2-ene-5-carboxylic acid methyl ester, and hydrolyzing at 20-30 DEG C for 2 hours to obtain a hydrolysis product; the hydrolysis product is subjected to epoxidation and hydrolysis with hydrogen peroxide under the condition of glacial acetic acid, and 1-bromine-5-hydroxy-3-oxa-tricyclic nonyl-2-ketone is obtained; according to the method, 1-bromo-5-hydroxy-3-oxa-tricyclic nonyl-2-ketone is cyanided by cuprous cyanide to prepare the 1-cyano-5-hydroxy-3-oxa-tricyclic nonyl-2-ketone monomer, and the method has the advantages that the raw materials are convenient and easy to obtain, the route is short, the reaction conditions are relatively mild, the operation safety is relatively high, the total yield is remarkably improved, and the like.

The invention discloses a natural ventilation cooling tower inner wall corrosion prevention method adaptive to an extreme temperature difference environment, and belongs to the technical field of cooling tower corrosion prevention. Comprising the steps that leakage treatment is conducted, specifically, according to cracks, honeycomb-shaped defects and holes in the inner wall of the cooling tower, drilling is conducted by adopting drilling parameters matched with the extreme temperature difference, after a grouting water stop needle is embedded, a corresponding grouting material is injected according to the dry and wet state of a leakage part, after grouting is completed, preset time is observed, and after it is confirmed that no leakage exists, the grouting needle is cut off, and a needle hole is plugged; the exposed ribs on the inner wall of the cooling tower are subjected to rust removal, a cracked and warped concrete protection layer and loose concrete are chiseled away, the concrete missing position is repaired with anti-crack mortar, and the water content of the inner wall is controlled to be smaller than or equal to 8% by flushing a cylinder body for standby application; and anti-corrosion coating is conducted, specifically, the surface of the treated base layer is sequentially coated with cyanogen setting permeable seal primer, cyanogen setting intermediate paint and cyanogen setting waterproof and anti-corrosion finish paint.

The invention belongs to the technical field of organic electroluminescent materials, and provides an electron transport material for an organic electroluminescent device and a preparation method of the electron transport material. The 9-alkyl-9-cyanogen-substituted aryl (or cyanogen-substituted nitrogen-containing heteroaryl) fluorene group with a substituent group enables the molecular structure to be twisted and the intermolecular interaction force to be weakened, cyanogen and pyridine enable the compound to have the electron-withdrawing property, electron transmission is facilitated, compounding of electrons and holes in a light-emitting layer is enhanced, and the light-emitting efficiency is improved. Aryl bridged triazine and pyrimidine six-membered nitrogen heterocycle are used for further improving the transmission performance of electrons, and as an electron transmission layer material of the organic electroluminescent device, the organic electroluminescent device has the characteristics of low driving voltage, high luminous efficiency and long service life.

The utility model discloses a small-diameter cyanuric chloride material pipe, which relates to the technical field of cyanuric chloride production and comprises a material pipe, sealing end plates are arranged at the left end and the right end of the outer surface of the material pipe, and a heat conduction oil pipe is arranged between the two sealing end plates. The outer edges of the two sealing end plates extend out of the heat conduction oil pipe to be provided with connecting edges, limiting end plates are arranged on the outer sides of the outer surfaces of the two sealing end plates, and a heat preservation pipe is arranged between the outer edges of the two limiting end plates. A heat preservation material is arranged between the heat preservation pipe and the heat conduction oil pipe and between the two limiting end plates, a punching partition plate is arranged in the middle of the front side and the rear side between the material pipe and the heat conduction oil pipe, the flow speed of a solution in the pipeline is increased, the temperature of the material pipe is increased, and the temperature of cyanuric chloride materials in the material pipe is increased; the crystallization of cyanuric chloride in the material pipe due to the characteristics of cyanuric chloride is reduced, and the blockage condition of the material pipe is reduced.

The invention relates to the technical field of cyanogen-containing wastewater treatment, and discloses a treatment device for extracting cyanogen-containing wastewater from gold ores, which comprises a treatment box, and also comprises a partition plate fixedly connected to the interior of the treatment box; the mixing mechanism is arranged between the partition plate and the bottom of the treatment box and is used for mixing wastewater between the partition plate and the bottom of the treatment box; the groove is formed in the top of the partition plate, and positioning mechanisms are symmetrically arranged on the side, close to the groove, of the partition plate; the inclined plate is rotationally connected to the top of the partition plate, a sealing assembly is arranged at the end of the inclined plate, an auxiliary shaft is rotationally connected to the inclined plate, and a stirring wheel and an aeration disc are fixedly connected to the auxiliary shaft and used for mixing wastewater between the top of the inclined plate and the treatment box; integrated treatment of wastewater pretreatment, sedimentation and cyanide breaking treatment can be achieved, the occupied space of equipment is small, the energy consumption is small, the wastewater mixing effect is good, and the wastewater treatment efficiency is high.

The invention discloses a wastewater treatment process for removing cyanide in sewage by utilizing a Fenton reaction mechanism, and belongs to the technical field of water treatment. The process comprises the following steps: adjusting the cyanogen-containing wastewater to be alkaline, then adding a modified ferrous catalyst, and carrying out a Fenton reaction. The process provided by the invention aims to effectively remove the cyanide in the sewage, and by optimizing the reaction conditions and using the catalyst, the process provided by the invention can realize that the cyanide removal rate reaches 90% or above, and has good economical efficiency and environmental friendliness. The method is suitable for industrial sewage treatment, and is especially suitable for treatment of cyanide-containing wastewater generated in metal smelting and chemical industries.

The application belongs to the technical field of pharmaceutical chemistry synthesis, and particularly relates to a synthesis method of a fluorofelarana intermediate 2-methyl-4-acetylbenzoic acid. In the application, o-chlorotoluene and acetyl chloride are reacted under the action of anhydrous aluminum chloride to generate 4-chloro-3-methylacetophenone; the 4-chloro-3-methylacetophenone and acetonitrile are catalyzed by Ni to generate 4-acetyl-2-methylbenzonitrile; and then the 4-acetyl-2-methylbenzonitrile is hydrolyzed to generate 2-methyl-4-acetylbenzoic acid. The application has the beneficial effect that acetonitrile is used as a cyanogen to replace halogen, and a highly toxic cyanide is abandoned, so that the whole process is safer and more environmentally friendly, the production of three wastes is reduced, and the synthesis cost of 2-methyl-4-acetylbenzoic acid is greatly reduced.

The invention discloses a synthesis method of limidoterol, and belongs to the technical field of medicine synthesis. The method comprises the following steps: coupling cyclobutanone oxime and a caffeic acid derivative under the catalysis of ferrous acetylacetonate, a chlorobenzene solvent and the protection of nitrogen to obtain a decarboxylated cyanogen alkylation intermediate; oxidizing the intermediate with m-chloroperoxybenzoic acid in dichloromethane in the presence of sodium carbonate to obtain a vicinal diol monoester intermediate; catalyzing by cobalt chloride in methanol, reducing by sodium borohydride, and protecting by Boc2O to obtain a cyclized precursor; cyclizing the precursor in tetrahydrofuran by using sodium hydride to obtain a cyclized intermediate; and performing deprotection to obtain the limiterol. According to the method, dangerous reagents and processes are not used, the safety is high, and no heavy metal residues exist; the cost is low, precious metals are not needed, the post-treatment operation is simple and convenient, a complex purification process is not needed, and the total yield reaches 21%; process conditions are mild, normal pressure and conventional heating modes are adopted, and industrial production is easy to realize.

The invention discloses a preparation method of a pure iodine broadband gap perovskite solar cell based on difluorophthalonitrile passivation, and relates to the technical field of solar cells. According to the cell, the surface of perovskite is treated through difluorophthalonitrile, on one hand, fluorine atoms and cyano groups have strong electronegativity, so that the center of a benzene ring is positively charged, charged iodine defects can be attracted through anion-pi interaction, further diffusion of the iodine defects is prevented, and ion migration is inhibited; on the other hand, fluorine atoms can interact with hydrogen atoms on organic cations in perovskite through hydrogen bonds, organic components are stabilized, and volatilization or decomposition of the organic components is inhibited. And fluorine can also form a hydrophobic protection layer on the surface of the perovskite, so that the environmental stability of the perovskite cell is improved. On the basis, the surface and interface defects of the perovskite are obviously reduced, and ion migration and non-radiative recombination are inhibited, so that the photoelectric conversion efficiency of the perovskite solar cell is improved, and the hysteresis effect of the device is reduced.

The application discloses a preparation method of cyanogroup / amidogroup dual-group modified carbon nitride photocatalytic material, and specifically comprises the following process: using original g-C3N4 obtained by heat polymerization of melamine as a starting material, using ionothermal reaction of a molten salt containing ammonium chloride to prepare a crystalline g-C3N4 photocatalyst with cyanogroup, and then using the characteristic that the cyanogroup can be hydrolyzed into amidogroup under acidic conditions, and treating the cyanogroup and amidogroup dual-group modified g-C3N4 photocatalytic material with a hydrochloric acid solution. The application solves the problems of low crystallinity, high photo-generated carrier recombination rate and poor solar light absorption and utilization rate of traditional photocatalytic materials using graphite phase carbon nitride.

The utility model discloses a device of ammonia circulation absorption in hydrocyanic acid, including ammonia absorption tower, decyanation tower, deamination tower, ammonia water buffer jar, ammonia water storage jar that connect in proper order, ammonia absorption tower top is equipped with deamination synthesis gas export, and ammonia absorption tower bottom output is divided into two ways, one way connects ammonia absorption tower tower kettle circulating pump, ammonia absorption tower cooler, and the other way connects ammonia absorption tower tower kettle production pump, and decyanation tower top is equipped with cyanogen containing steam export, and decyanation tower bottom output is divided into two ways, one way connects decyanation tower tower kettle circulating pump, decyanation tower tower kettle reboiler, and the other way connects decyanation tower tower kettle production pump, and decyanation tower top is equipped with ammonia containing steam export, and deamination tower bottom output is divided into two ways, one way circularly connects deamination tower tower kettle circulating pump, deamination tower tower kettle reboiler, and the other way connects deamination tower tower kettle production pump, deamination tower tower kettle cooler, the device of the utility model has solved the problem of safety risk to the operator and the process in the production process of existing hydrocyanic acid using sulfuric acid to absorb ammonia.

The invention provides a cyano and carbazolyl-containing triazine compound and application thereof, the cyano and carbazolyl-containing triazine compound has a structure as shown in formula I. The cyano and carbazolyl-containing triazine compound obtained by designing the structure of the compound has excellent performance, and can be used for preparing a novel triazine compound. The organic light-emitting device prepared by using the compound as a light-emitting layer material has relatively low driving voltage and relatively high current efficiency.

The invention provides a method and system for removing high-concentration complex cyanogen in gold extraction wastewater, and relates to the technical field of sewage treatment.The method comprises the steps that the pH of the gold extraction wastewater is adjusted to 8-10, and pretreated wastewater is obtained; adding a cobalt ferrite particle catalyst into the pretreated wastewater, and introducing ozone to obtain oxidized effluent; dividing the oxidized effluent into a solution A and a solution B according to a volume ratio, oxidizing the solution A by using anaerobic ammonium oxidation bacteria under the condition of low dissolved oxygen, and mixing the oxidized solution A with the untreated solution B to obtain a mixed solution; enabling the mixed solution to react with anaerobic ammonium oxidation bacteria through a porous adsorption material, and recovering the cobalt ferrite particle catalyst for recycling. According to the method, the removal rate of the high-concentration complex cyanogen can be effectively increased, thorough mineralization of the complex cyanogen is achieved, and the core problem that the complex cyanogen is difficult to degrade is solved; and the method and the system have relatively high load resistance, are simple and convenient to operate and have good adaptability.

The utility model discloses a reaction device which comprises a waste water tank, the output end of the wastewater tank is connected with the cyanogen breaking kettle and is used for conveying cyanogen-containing waste liquid; a first pump body is arranged at the output end of the cyanogen breaking kettle, and the output end of the first pump body is connected with the top of the cyanogen breaking kettle and a neutralization kettle; a second pump body is arranged at the output end of the neutralization kettle, and the output end of the second pump body is connected with the top of the neutralization kettle and a saline water tank; the cyanogen breaking kettle, the neutralization kettle and the wastewater tank are matched for use, a first pump body and a second pump body are utilized for circulation in the cyanogen breaking and neutralization process, full reaction is achieved, the total cyanogen content of cyanogen-containing wastewater obtained through cyanidation synthesis of o-chlorobenzyl cyanide can be reduced to 20 mg / kg, and meanwhile the pH value of saline water is close to alkalescence.

The utility model relates to the technical field of industrial solid waste treatment, in particular to a cyanogen-containing tailing slag treatment device which comprises a base, a shell is arranged at the top of the base, a connecting cover is fixed to the top of the shell, and a sealing cover is hinged to the top of the connecting cover; a connecting hole is formed in the outer wall of the shell, an ozone pipe is installed in the connecting hole, an ozone hole is formed in the outer wall of the ozone pipe, a strip-shaped pipe is installed at one end of the ozone pipe, a connecting pipe is installed at one end of the strip-shaped pipe, and one end of the connecting pipe is connected with external ozone generating equipment. The hydraulic rod can be matched with the connecting lug to jack up the shell, so that the base is separated from the shell, the filler and the cyanogen-containing waste residues in the shell can directly overflow from the separation position of the base and the shell at the moment, the purpose of rapid discharging is achieved, and compared with the prior art, the device can rapidly discharge the filler and the cyanogen-containing waste residues from the interior of the shell and is convenient to use.

The invention relates to the technical field of fine chemical engineering, in particular to a continuous synthesis method of glufosinate ammonium, which comprises the following steps: A) mixing diethyl methylphosphonite, acrolein and acetic acid for condensation reaction to obtain a compound a-1; b) mixing the compound a-1 with water, and carrying out a first hydrolysis reaction under the action of a catalyst to obtain a first system; c) returning a part of the first system to the condensation reaction system in the step A), and respectively reacting ethanol and acetic acid with diethyl methylphosphonite and acrolein to generate a compound a; mixing the unreturned part in the first system with an acidic compound, and carrying out a second hydrolysis reaction to obtain a compound c; d) the compound c, an ammonia source and a cyanide source are subjected to a cyanamide reaction to obtain a compound d, the ammonia source is selected from ammonia water or a mixture of ammonia water and ammonium chloride, and the cyanide source is selected from sodium cyanide or hydrogen cyanide, and E) the compound d is subjected to a third hydrolysis reaction to generate glufosinate-ammonium.

The invention belongs to the technical field of fine chemical engineering, and particularly relates to a preparation method of tetramethylguanidine, which comprises the following steps: step 1, reacting cyanogen chloride with dimethylamine at low temperature in a tubular reactor to generate dimethylamino cyanogen and dimethylamine hydrochloride, step 2, heating intermediates of the dimethylamino cyanogen and the dimethylamine hydrochloride, and reacting to obtain the tetramethylguanidine. The method comprises the following steps: 1, adding a sodium hydroxide aqueous solution into a reaction solution, carrying out heat preservation on the reaction solution after adding a catalyst, and carrying out high-temperature condensation to generate tetramethylguanidine hydrochloride, 3, cooling the product, filtering to obtain tetramethylguanidine hydrochloride, and washing the tetramethylguanidine hydrochloride with a detergent, and 4, carrying out a neutralization reaction on the sodium hydroxide aqueous solution and tetramethylguanidine hydrochloride to obtain the tetramethylguanidine hydrochloride. And extracting the reaction solution by using an organic solvent, and fractionating to obtain free tetramethylguanidine. The catalyst is added in the reaction process, so that the temperature required by the reaction is reduced, the time required by the reaction is shortened, a continuous flow process is realized, and the productivity is remarkably improved.

A gas measuring device (100) measures cyanogen in the presence of hydrogen cyanide. The gas measuring device (100) includes a measuring chamber (101), a heating element (103, 203) and an electrochemical sensor (105, 200). The measuring chamber (101) is configured to receive a sample. The heating element (103) is configured to thermally decompose cyanogen contained in the sample into decomposition products. The sensor (105, 200) is configured to detect the decomposition products of cyanogen, which are obtained by the thermal decomposition. A process measures cyanogen in the presence of hydrogen cyanide.

The application belongs to the field of pharmaceutical chemistry, and specifically discloses a preparation method of 7-formyl-2,3-dihydrobenzofuran-4-carbonitrile, which comprises the following steps: coupling reaction of a compound shown in formula VI with cyanogen under the action of a palladium catalyst to generate a compound shown in formula VII. The method provided by the application is low in cost, good in safety, high in yield, and suitable for large-scale industrial production.

The application relates to the technical field of wastewater treatment, and discloses a high-chlorophenol cyanogen wastewater treatment method, which comprises the following steps: adjusting the pH of high-chlorophenol cyanogen wastewater by using an alkaline substance, standing to form a precipitate, skimming the precipitate, filtering, and collecting pretreated high-chlorophenol cyanogen wastewater; adding a composite adsorbent to the pretreated high-chlorophenol cyanogen wastewater, carrying out adsorption treatment, filtering, collecting the wastewater and the precipitate after adsorption, mixing the wastewater and a microbial agent, carrying out biochemical treatment, standing to precipitate, filtering, collecting the wastewater after biochemical treatment, and carrying out detection and discharge. The high-chlorophenol cyanogen wastewater is subjected to adsorption treatment by using the composite adsorbent, most of the organic pollutant in the wastewater is effectively removed, the content of chloride ions is reduced, and a suitable environment is provided for biochemical treatment of the wastewater; then the wastewater is subjected to biochemical treatment by mixing the microbial agent, the organic pollutants which are difficult to remove by adsorption in the wastewater are deeply removed, the treated wastewater meets the water outlet indexes, and can be directly discharged.

The invention discloses a hydrophobic cross-linking monomer and a preparation method thereof as well as plugging gel for well drilling and a preparation method thereof. The hydrophobic cross-linking monomer is synthesized by taking a naphthenic compound and an amino compound as raw materials in the presence of a solvent and a cyanation reagent; the plugging gel is obtained by polymerizing alkenyl amide, alkenyl carboxylic acid and a hydrophobic cross-linking monomer. According to the hydrophobic crosslinking monomer, the molecular rigidity and high-temperature stability are improved, the thermal motion degree of molecules under the high-temperature condition is reduced, and the hydrophobicity of plugging gel molecules is enhanced, so that a hydrophobic area is favorably formed in the gel, the affinity of gel molecular chains and water molecules is reduced, and then the water dilution resistance of the plugging gel is improved; the plugging gel has good water dilution resistance, the plugging success rate can be effectively increased, the product production process is simple, and industrial production is facilitated.