104 results about "Potassium cyanate" patented technology

The invention discloses a low-temperature surface nitriding method of a titanium alloy, and belongs to the technical field of metal surface heat treatment and modification. The low-temperature surface nitriding method is characterized by comprising the following steps of: firstly, carrying out sand blasting cleaning on the surface of the titanium alloy, then carrying out chemical mechanical lapping and polishing, then mixing powder crystal sodium cyanate (NaCNO) and granular crystal potassium cyanate (KCNO) and rare earth CeO2 powder in a certain proportion so as to obtain a nitriding reagent, placing the nitriding reagent and the treated titanium alloy in a crucible for compacting and sealing, then drying, and placing the crucible in a high-temperature furnace for heating, wherein NaCNO and KCNO are used as nitriding sources, and rare earth CeO2 is used as a catalyst. According to the low-temperature surface nitriding method, a TiN 0.3-1 nitriding layer is formed on the surface of the titanium alloy TC21, the friction coefficient of the surface of the titanium alloy is remarkably reduced, the surface hardness is increased, and the surface property is enhanced.

The invention discloses a modified lime sulphur and an application thereof in a gold leaching technology. The modified lime sulphur comprises a stabilizer sodium-hexametaphosphate, oxidants-calcium peroxide and potassium cyanate, and additives-lead nitrate and soluble bromides (such as sodium bromide, potassium bromide, calcium bromide and the like). The modified lime sulphur is used as a gold leaching agent so as to effectively recover gold from gold-containing ores, gold concentrate powder and gold-containing wastes. The modified lime sulphur has the characteristics that the modified lime sulphur is easy to synthesize; the preparation cost is low; the preparation process is environment-friendly and toxic-free; and when the prepared modified lime sulphur is used for gold leaching, the gold leaching technology is simple, and the gold leaching velocity is high; and moreover, the modified lime sulphur is suitable for more ores than cyaniding gold leaching.

The invention provides an optical resin monomer with high refractive index. The monomer has the structural formula shown in the specification, wherein in the structural formula, R is hydrogen, alkyl, alcoxyl, halogen and aryl; Ph is a benzene ring; m and n are integers; m is not less than 1 and not more than 6; and n ranges from 0 to (6-m). A preparation method comprises the following steps: taking the following raw materials: aromatic hydrocarbon, NBS (N-bromosuccinimide), BPO (benzoyl peroxide), thiourea, sodium hydroxide, hydrochloric acid, epichlorohydrin and potassium thiocyanate, wherein the mole ratio of aromatic hydrocarbon to NBS to thiourea to sodium hydroxide to hydrochloric acid to epichlorohydrin to potassium thiocyanate is 1:(3-5):0.1:(3-5):(9-12):(6-10):(3-5):(10-15); step 1. carrying out halogenation; step 2. carrying out halogen methylated thiolation: adopting a thiourea hydrocarbylation hydrolysis method or thiocyanate direct substitution method; 3. carrying out epoxidation: using a universal epichlorohydrin preparation method; and 4. preparing cyclic sulfide products: adopting a universal cyclic sulfide preparation method.

The invention discloses a method for preparing N-carbamoylglutamic acid. The method comprises the following steps: a. Mixing glutamic acid, potassium cyanate, potassium hydroxide, concentrated hydrochloric acid and urea propionic acid according to 1-1.5: The molar ratio of 1-1.5:1-1.5 is fully mixed to obtain the mixture; b. The mixture obtained in step a is dissolved in 1L of distilled water per 1-1.5mol, and placed at room temperature at 20-25°C for 16-20 hours to obtain Contain the liquid of the mixture described in step a of 1-1.5mol in every unit of liquid; c. acidify each unit of liquid described in step b with 80-100ml of concentrated hydrochloric acid, then stand in 200ml of ureapropionic acid for 2-3 hours After filtering, N-carbamylglutamic acid was recrystallized from water. Compared with other existing methods for producing N-carbamylglutamic acid, the present invention has the following advantages: 1. The method uses cheap glutamic acid as a raw material, which greatly reduces the production cost. 2. The production process is carried out at room temperature, and the process is simple. 3. N-carbamoylglutamic acid recrystallized from water has no toxic and side effects. The invention provides a practical way for really realizing the use of N-carbamyl glutamic acid as arginine substitute.

The invention provides a preparation method of cobalt-manganese composite oxide nanoparticles and the application of the cobalt-manganese composite oxide nanoparticles prepared by adopting the method in a lithium ion battery. The corresponding method comprises the steps that a predetermined amount of manganese acetate and polyvinylpyrrolidone are dissolved in water and an ethanol solution, and a manganese acetate and polyvinylpyrrolidone solution is obtained; under a predetermined temperature condition, a cobalt potassium cyanate solution is dropwise added into the manganese acetate and polyvinylpyrrolidone solution, is magnetically stirred and then stands still for predetermined time, and cobalt cyanic acid radical complex nanoparticles are obtained through centrifugal separation; and the dried cobalt cyanic acid radical complex nanoparticles are calcined in air for predetermined time at a calcination temperature of 400 DEG C, and the cobalt-manganese composite oxide nanoparticles are obtained after the calcination. According to the preparation method, higher temperature and longer reaction time are not needed, the shapes and the structures of the particles are easy to control, the manufacturing process is relatively simple, the requirement for equipment is not high, and large-scale popularization and application can be realized.

The invention relates to a salt bath formula for treating a high-speed steel air conditioning compressor blade by salt bath nitriding treatment and a treatment method. The salt bath formula comprises the following compositions in percentage by weight: 15-25 percent of potassium cyanate, 5-20 percent of sodium cyanate, 3-10 percent of lithium carbonate, 8-20 percent of sodium carbonate, 10-40 percent of potassium carbonate and 1-10 percent of sodium chloride. The invention has the advantages that because Li ions and Cl ions are added in the formula, the melting point of salt bath is lowered, and nitridation can be carried out under lower temperature; the activity is favorable, and good appearance and good diffusion layer thickness can be achieved without introducing ammonia; and the K / Na concentration proportion is enhanced, and a white layer is not easy to form on the surface of a workpiece.

The invention relates to a method for synthesizing Sulfentrazone. The method is characterized by comprising the steps of liberating o-chlorophenylhydrazine from o-chlorophenylhydrazine hydrochloride, which serves as a raw material, by an alkali, subjecting o-chlorophenylhydrazine to a reaction with trimethyl orthoacetate and potassium cyanate so as to obtain 1-o-chlorophenyl-3-methyl-1H-1,2,4-triazol-5-one, and then, subjecting 1-o-chlorophenyl-3-methyl-1H-1,2,4-triazol-5-one to N-alkylation, chlorination, nitration, reduction and sulfonylation, thereby obtaining the Sulfentrazone, wherein a composite catalyst and a solvent, i.e., dichloroethane are adopted in a chlorination reaction. The method for synthesizing the Sulfentrazone, disclosed by the invention, has the advantages that the o-chlorophenylhydrazine hydrochloride serves as the raw material, so that the steric hindrance of an intermediate product can be low, and the yield of the product is increased; and meanwhile, in the chlorination reaction, the composite catalyst is adopted, thus, the orientation effect on all atoms is good, and the solvent is dichloroethane, so that the recycling of the solvent is facilitated.

The solid rare-earth energizer for chemical thermal treatment comprises: 40-90w% energizer of rare-earth chloride as any combination of La, Ce, Pr and Nd or single La or Ce; and 10-60w% auxiliary agent that contains 20-30% urea, 2-30% biamino hydride, 20-30% potassium ferrocyanide, and 20-25% KCN or NaCN; or 50-70% KCl, 20-40% NaCl, and 2-10% boric acid. This invention overcomes defects in prior art, and has high efficiency, large effect to metal phase tissue modification, and wide application range.

This invention relates to an electrolyte as well as a method for the deposition of a gold-copper alloy on a substrate surface. With the electrolyte and method disclosed, deposition of gold-copper alloys with a value of carat in the range of 12 to 19 kt is possible. Beneath a source of gold and copper, the inventive electrolyte comprises potassium cyanate (KCN) in a concentration capable to maintain a copper to KCN ratio in the range of 3 to 7, and at least one complexing agent of the group consisting of ethylenediamine tetraacetic acid, diethylenetriamine pentaacetic acid, nitrilo-triacetic acid, ethylenediamine tetraacetic acid [EDTA], diethylenetriamine pentaacetic acid and nitrilo-triacetic acid [NTA] Hydroxyethyl imino diacetic acid [HEIDA], nitrilo propionic diacetic acid [NPDA], imino diacetic acid [IDA], nitrilo trimethylphosphoric acid [NTMA, Dequest 2000], triethanol amine [TEA].

The invention relates to a salt bath formula for treating a stainless air conditioning compressor blade by salt bath nitriding treatment and a treatment method. The salt bath formula comprises the following compositions in percentage by weight: 5-20 percent of potassium cyanate, 15-25 percent of sodium cyanate, 3-10 percent of lithium carbonate, 8-25 percent of sodium carbonate, 10-30 percent of potassium carbonate, 1-3 percent of sodium hydroxide, 1-5 percent of potassium hydroxide and 1-15 percent of sodium chloride or sodium fluoride. The invention has the advantages that because Li ions and Cl ions are added in the formula, a melting point of salt bath is lowered, and nitridation can be carried out under lower temperature; the activity is favorable, and good appearance and good diffusion layer thickness can be achieved without introducing ammonia; and air cooling can be adopted after salt bath nitridation without adopting the traditional oil cooling mode.

The invention provides a preparation method of a cobaltosic oxide nano cage and the application of the cobaltosic oxide nano cage prepared by adopting the method in a lithium ion battery. The corresponding method comprises the steps that a predetermined amount of cobalt potassium cyanate and polyvinylpyrrolidone are dissolved in distilled water, and a cobalt potassium cyanate and polyvinylpyrrolidone solution is obtained; a cobaltous acetate solution is dropwise added to the cobalt potassium cyanate and polyvinylpyrrolidone solution, is magnetically stirred and then stands still for predetermined time, and then cobalt cyanate cobalt is obtained through centrifugal separation; the dried cobalt cyanate cobalt is calcined in air respectively at the calcination temperatures of 400 DEG C, 450 DEG C and 550 DEG C, and the cobaltosic oxide nano cage is obtained after the calcination; the dried cobalt cyanate cobalt is calcined in air for predetermined time at a calcination temperature of 650 DEG C, and a mixture of the cobaltosic oxide nano cage and cobaltosic oxide solid nanoparticles is obtained after the calcination. According to the preparation method, high temperature and high pressure are not needed, the manufacturing process is relatively simple, the requirement for equipment is not high, an operator only needs to use conventional equipment, and large-scale production can be realized.

The invention discloses a hydrogen-free precursor synthesized carbon nitride photocatalyst, as well as a preparation method and application thereof, and belongs to the technical field of material preparation and photocatalysis. According to the preparation method, cyanuric chloride, potassium thiocyanate and lithium chloride are adopted as the precursor to synthesize the carbon nitride photocatalyst. The prepared carbon nitride photocatalyst is narrow in band gap and high in quantum efficiency; by adopting platinum as a catalyst promoter and triethanol amine as a sacrifice agent, the photocatalytic activity of the carbon nitride photocatalyst for producing hydrogen exceeds that of the commercial titanium dioxide photocatalyst P25 under the lighting condition of greater than 300 nm; the preparation method is simple in technology and low in cost, conforms to the actual production demand, and has great application potential.

The invention discloses a method for preparing high-purity potassium cyanate, which belongs to preparation of the potassium cyanate. The method takes industrial urea and potassium carbonate as raw materials and dimethyl sulfoxide or dimethyl formamide as a solvent, and adopts proper technological conditions: the reaction temperature is 130 DEG C, the reaction time is 8 hours, the mol ratio of the urea to the potassium carbonate is 3.5 to 1, and the mass ratio of the solvent to the urea is 7 to 1; the product with 96 percent (mass fraction) of the potassium cyanate can be obtained, and the obtained potassium cyanate is washed by adopting anhydrous alcohol as a detergent, wherein the amount of the detergent is 3 to 4 times of the volume of the potassium cyanate; and the potassium cyanate after washing is dried, and the potassium cyanate with the purity of more than 98 percent (mass fraction) can be obtained. The method has the advantages that the technology is simple and easy and the purity of the prepared potassium cyanate is as high as more than 98 percent (mass fraction).

The invention provides a method for preparing carbamyl glycine dipeptide iron chelate, which comprises the following steps: preparing carbamyl glycine dipeptide by utilizing glycine and potassium cyanate, preparing carbamyl glycine dipeptide iron chelate by utilizing the carbamyl glycine dipeptide and ferrous sulfate, and the like. The invention also provides carbamyl glycine dipeptide iron chelate prepared by the method, which is used for preparing feeds or additives for preventing baby pigs or pregnant sows from anemia. The product provided by the invention can effectively increase the hemoglobin concentration in the blood of sows and baby pigs during the parturition of the sows; and the method provided by the invention can replace the traditional method for complementing iron by injecting newborn baby pig muscle injections, thereby saving the labor force and being convenient to use.

The invention relates to a preparation and usage method of a water quality heavy metal detection agent. The preparation and usage method comprises the following steps: respectively weighing potassium hydroxide, potassium thiocyanate and polyvinylpyrrolidone at a mass ratio of (0.5-1):20:1, mixing and grinding to obtain a heavy metal detection powder I; weighing 4-(2-pyridylazo)-resorcinol, absolute ethyl alcohol, ammonium sulfate and ammonium chloride at a mass ratio of (0.02-0.1):10:100:100, dissolving 4-(2-pyridylazo)-resorcinol into absolute ethyl alcohol, evenly mixing with ammonium sulfate and ammonium chloride, drying, cooling and grinding to obtain a heavy metal detection powder II; adding 0.1-0.5g by mass of heavy metal detection powder I into 10ml a to-be-detected water sample, adding 0.2-0.8g by mass of heavy metal detection powder II after dissolution, standing for 10 minutes after dissolution, and measuring with a chromometer or a spectrophotometer, to obtain the concentration of heavy metals in the to-be-detected water sample. The preparation and usage method is high in sensitivity, the quality is stable, the carrying is convenient, the operation is simple, and the preparation and usage method is used for detecting the total amount of manganese (II), cobalt (II), nickel (II), copper (II), zinc (II), cadmium (II) and lead (II) in surface water, underground water, sea water, drinking water, industrial and agricultural water, and industrial waste water.

A method for diffusing titanium and nitride into a base material having a coating thereon using conventional surface treatments or coatings. The method generally includes the steps of providing a base material having a coating thereon; providing a salt bath which includes sodium dioxide and a salt selected from the group consisting of sodium cyanate and potassium cyanate; dispersing metallic titanium formed by electrolysis of a titanium compound in the bath; heating the salt bath to a temperature ranging from about 430° C. to about 670° C.; and soaking the base material in the salt bath for a time of from about 10 minutes to about 24 hours. In accordance with another aspect of the present invention, titanium and nitride may be diffused into a base material without a coating. The treated base material may further be treated with conventional surface treatments or coatings.

The invention relates to a preparation method of a graphene oxide adsorption material adsorbing copper ions, and particularly relates to a preparation method of a graphene oxide adsorption material. The invention aims to solve the problem of low adsorption capacity of modified graphene oxide for copper ions. According to the preparation method, water is used as a solvent, and graphene oxide is grafted with triethylene tetramine and then is modified with potassium cyanate, so as to obtain a solid copper ion adsorption material with multiple adsorption sites. The material prepared by using the preparation method has a good adsorption effect on copper ions and can reach the hygienic standard of domestic drinking water after adsorption, the adsorbent is stable in properties and is not influenced by acid and alkaline, and the situations of secondary pollution and the like cannot occur; the synthetic method is simple and is suitable for industrial production. The preparation method is used in the field of treating heavy metal pollutants in water.

The invention discloses a cellulose-chitosan compound and a preparation method thereof. According to the preparation method, polysaccharides biomass resources cellulose and chitosan which are quite abundant are used for preparing the cellulose-chitosan compound in a novel ethidene diamine or potassium thiocyanate solvent system. The compound has strong capacity of absorbing heavy metal ions Cu<2+>,Pb<2+> and Cd<2+>; and the solvent ethidene diamine or potassium thiocyanate adopted by the method is low in price and can be recycled, thus reducing pollution to the environment.

Disclosed herein is a composition and method for sample preparation of proteins for their size separation by electrophoresis, suitable for molecular-weight determination of proteins in the range between about 14,000 and 500,000. In an embodiment, proteins, particularly those exhibiting biased migration, are modified to change their intrinsic charge, or carbohydrate component to improve accuracy of their molecular weights as determined by electrophoretic size separation via their interaction with ionic surfactants. In a preferred embodiment, the proteins are carbamylated with potassium cyanate and their carbohydrate components are oxidized with sodium periodate.

The invention relates to a preparation method of 3-isocyanate propyltriethoxysilane, belonging to the field of fine chemical synthesis. The method comprises synthesizing the 3-isocyanate propyltriethoxysilane from chloropropyltriethoxysilane and potassium cyanate through one-step synthesis in an ionic liquid adopted as a solvent under a catalysis function. An isocyanate process is adopted, and aiming at disadvantages, of the process, that reaction raw materials are difficult to dissolve and yields are low, the preparation method of the 3-isocyanate propyltriethoxysilane based on the ionic liquid is provided.

An improved method is provided for diffusing titanium and nitride into a base material comprising a steel or steel alloy. The composition of the base material generally comprises at least one of the following: more than about 1.95% vanadium, less than about 4.1% chromium, and a presence of cobalt. The method generally includes the steps of providing such a base material; providing a salt bath which includes sodium dioxide and a salt selected from the group consisting of sodium cyanate and potassium cyanate; dispersing metallic titanium formed by electrolysis of a titanium compound in the bath; heating the salt bath to a temperature ranging from about 430° C. to about 670° C.; and soaking the base material in the salt bath for a time of from about 10 minutes to about 24 hours.

The invention discloses a method for synthesizing the secondary butyl urea adopting catalytic processes of carbon dioxide. It includes the following steps: preparing aqueous solution by potassium cyanate dissolved by water; putting the secondary butyl amine into the reactor and diluting them by water; adding the potassium cyanate solution into the secondary butyl amine and intimately mixing them; drumming gas of carbon dioxide to the said solution and reacting; distilling the water and the excess econdary butyl amine; filtering while the system is in a high temperature to obtain the by-product of potasium carbonate; decompressing and concentrating to the mixture to remove the alcohols and obtaining the product of secondary butyl urea. The invention is of low cost, simple method, cheap stock, and higher market value of by-product of potasium carbonate. The invention is extensively used in synthesizing the secondary butyl urea of chemical intermediate and is of broad market outlook.

The invention relates to a method for preparing 2,4-dichloroquinazoline. The method comprises the following steps that: (1) ortho-aminobenzoic acid reacts with potassium cyanate to generate 2,4-quinazoline diones; and (2) the 2,4-quinazoline diones and a chlorinating agent undergo a chlorination reaction to generate the 2,4-dichloroquinazoline. Particularly, in step (1), the mass ratio of the ortho-aminobenzoic acid to the potassium cyanate is 1:1-3, the reaction uses water as a solvent, and is performed at a temperature of between 20 and 100 DEG C with pH of between 9 and 12; and in step (2), the chlorination reaction uses fatty amine as a solvent. The method uses non-toxic solvent and accessible raw materials, has high reaction yield, and is applicable to industrial production.

The present invention relates to a salt bath formula and treatment method in the salt bath nitriding treatment of stainless steel air-conditioning compressor blades. The salt bath formula of the present invention is composed of the following components and proportioned by weight percentage: potassium cyanate and cyanic acid 25%-50% of sodium, 8%-25% of sodium carbonate, 10%-30% of potassium carbonate, 20%-40% of sodium chloride or potassium chloride; The process makes the passivation film on the surface of the blade removed by pickling, which is easy to infiltrate nitrogen during salt bath nitriding; because the concentration of Cl (7-17%) is increased in the formula, the melting point in the salt bath is reduced, and the formula does not contain Li And K2S can still be nitrided at lower temperature.

The invention discloses a method for cleanly producing high-purity cyanate at a low temperature, which comprises the following steps of: mixing urea and carbonate for 10-20 min for standby; adding cyanate bottom materials into a reactor, adding a mixture of the urea and the carbonate after the cyanate bottom materials are preheated to 140-150 DEG C; completely reacting the urea and the carbonate at a temperature of 160-180 DEG C; and obtaining a cyanate product after reacted materials are crushed. The invention also can adopt a continuous production manner. In the invention, potassium cyanate (sodium cyanate) is adopted as bottom materials so as to improve the dispersion of the reacted materials, more completely react the reacted materials, improve the product purity and generate no pollution; the reaction is conducted under the closed low-temperature environment so as to generate no toxic byproducts and greatly improve the safety; and the produced gas almost can be completely recovered without three-waste pollution. The high-purity cyanate has remarkable economic benefit and social benefit.

The invention provides a bimetal oxide and graphene composite material and a preparation method thereof. The method comprises the steps of 1: preparing a dispersion from a graphene oxide, and adding ametal chloride salt thereto to obtain a solution 1; preparing a solution 2 having the same concentration as the metal chloride salt from a metallic potassium cyanate salt; 2: stirring the solution 1and the solution 2 uniformly separately, and then dripping the solution 2 into the solution 1 at a ratio of 2:3 by volume; and 3: transferring the mixed solution to a high-temperature and high-pressure reaction vessel, and hydrothermally reacting at 120 DEG C for 6 h; continuing to control the temperature to 180 to 220 DEG C, hydrothermally reacting for 18 h, and performing natural cooling to obtain the bimetal oxide and graphene composite material. In-situ growth of the bimetal oxide on the surface of the carbon material can be realized without high-temperature calcination, and the molar ratio of the two metals in the bimetal oxide can be accurately controlled. The prepared bimetal oxide has regular nanocube morphology.

The invention discloses a chloride type trivalent chromium black chromium plating solution which comprises the following components by weight: 30 to 70g / L of chromium trichloride, 150-320g / L of conducting salt, 20 to 70g / L of complexing agent, 2 to 10g / L of blackening agent, and 0.2 to 1g / L of surfactant, wherein the conducting salt is one of or a mixture of potassium chloride, sodium chloride, ammonia chloride, sodium sulfate and potassium sulfate; the complexing agent is one of or a mixture of ammonium oxalate, malic acid and formic acid; and the blackening agent is one of or a mixture of ferric chloride, potassium thiocyanate, ammonium thiocyanate and cobalt nitrate. According to the chloride type trivalent chromium black chromium plating solution, a trivalent black chromium plating layer with thickness being 0.2 to 0.5microns can be obtained, an appearance of the plating layer is uniform and bright black, and the colors of a high electric current density region and a low electric current density region are essentially identical; and the chloride type trivalent chromium black chromium plating solution does not yellow or change color even if being placed in air in a plum rain season, and the mildews can not be found.

The invention discloses a synthesis method for antioxidant 1790. Raw materials include potassium cyanate, aprotic polar solvent, 2,6-dimethyl-4-tertiary butyl-5-hydroxy benzyl chloride and catalysts, wherein the molar ratio between the potassium cyanate and the 2,6-dimethyl-4-tertiary butyl-5-hydroxy benzyl chloride is 1-2: 1. Firstly, the potassium cyanate is added to aprotic polar solvents, the catalysts are added, heating is carried out until the temperature is 80-140 DEG C, the 2,6-dimethyl-4-tertiary butyl-5-hydroxy benzyl chloride is added, reaction continues for 8-14 hours, pressure is reduced after the reaction is finished, the aprotic polar solvents are removed, water is added, a crude product is obtained after filtering, washing is carried out, the crude product is recrystallized through ethyl alcohol and water, and finally the antioxidant 1790 is obtained. The synthesis method for the antioxidant 1790 is simple in process, relatively moderate in condition, short in reaction time, high in product purity, high in yield, low in cost, little in generated waste water, and beneficial to the environment and industrial production.