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30 results about "Potassium rhodanide" patented technology
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Method for preparaing dephosphorized and ferrum-carried activated carbon adsorbent
InactiveCN102614854AImprove adsorption capacityImprove processing efficiencyOther chemical processesPotassium rhodanidePotassium thiocyanate
The invention belongs to the technical field of sewage treatment, in particular to a method for preparaing dephosphorized and ferrum-carried activated carbon adsorbent, which comprises the following steps of: soaking powdered activated carbon through hydrochloric acid, washing through water, and drying at the temperature of 100-150 DEG C; injecting the obtained activated carbon into strong oxidizing acid solution so as to be soaked, rinsing, and drying a rinsed sample; and finally, mixing the obtained activated carbon and inorganic ferric salt solution, stirring, re-drying, cooling to room temperature, removing surface layer coverings, washing unloaded ferric oxide through water until rinsing to be without obvious color and without red color through test by potassium rhodanide solution, and drying continuously to obtain the high-efficient dephosphorized activated carbon adsorbent rich in iron oxide compound. Compared with the prior art, the method has the advantages of simplicity, moderate preparing condition, easiness in implementation, strong operability, high processing efficacy for waste water containing phosphorus, and purification cost reduction.
Owner:FUDAN UNIV
Method for measuring content of silver in high-bismuth material
ActiveCN103926372AEasy to operateHigh precisionMaterial analysis by observing effect on chemical indicatorChemical analysis using titrationPotassium rhodanidePotassium thiocyanate
The invention discloses a method for measuring the content of silver in a high-bismuth material. The measuring method is characterized by comprising the following steps: quantitatively trapping precious metal in a sample with bismuth oxide as a trapping agent of precious metal; smelting the sample at the temperature of 900-1100 DEG C for 30-60 min to obtain a bismuth buckle; dissolving the bismuth buckle by nitric acid and tartaric acid under a heating condition; and titrating with a potassium rhodanide standard solution to measure the content of silver in the sample. The measuring method is simple to operate; the accuracy and recycling rate of the measuring method are high and meet the requirement of an analysis method; the impurity interference is small and the problem that the accuracy of measurement on the content of silver is low due to relatively high impurity content in a high-bismuth material sample is solved.
Owner:HUNAN SHUI KOU SHAN NONFERROUS METALS GRP
Bivalent cation magnetic ionic liquids and preparation method thereof
ActiveCN102167683AOvercome the disadvantage of uncontrollable magnetismSolve the problem of less magneticOrganic chemistryMagnetic liquidsPotassium rhodanidePotassium thiocyanate
The invention relates to bivalent cation magnetic ionic liquids and a preparation method thereof, and belongs to the technical fields of novel chemical materials and preparation. N-alkyl imidazole, 1,m-dibromoalkane, 1,m-dicholoroalkane, ferric trichloride, lanthanide metal oxide, potassium rhodanide and aqueous solution of perchloric acid are taken as raw materials to be prepared into the bivalent cation magnetic ionic liquids with different anion structures; and compared with the conventional magnetic ionic liquid, the magnetic ionic liquids have high magnetism, magnetic controllability and higher thermal stability. The invention realizes magnetic designability of the magnetic ionic liquids for the first time, and promotes the application of the magnetic ionic liquids in the fields such as aviation, medicines, biology and the like.
Owner:INST OF PROCESS ENG CHINESE ACAD OF SCI
Method for measuring chloride ion in acidity plating solution
InactiveCN103852466ALow priceEasy to manageMaterial analysis by observing effect on chemical indicatorPotassium rhodanideAlkalinity
The invention provides a method for measuring chloride ions in an acidity plating solution. The method comprises the steps of adding sodium hydroxide in the acidity plating solution, adjusting the pH value of the plating solution to alkalinity, removing precipitate generated in the plating solution, adjusting the pH value of a certain amount of filtered plating solution to be 9-10 with nitric acid, titrating with a silver nitrate solution to a terminal point by using potassium chromate as an indicator, titrating with potassium rhodanide by using ammonium ferric sulfate as the indicator when the silver nitrate solution is excessive, and calculating the content of chloride ions in the acidity plating solution. By adopting the method for measuring the chloride ion in the acidity plating solution, the content of the chloride ions in the acidity plating solution can be rapidly and accurately measured on the scene and in a small-and-medium size lab, an expensive analytical instrument is not required, the method is convenient and rapid, and has the time-saving effect, and the analysis result is accurate and reliable. Reaction measuring substances are all regular chemicals, low in cost and toxicity and convenient to manage and use.
Owner:AMPHENOL TIANJIN ELECTRONICS
Determination method of copper in raw gold
InactiveCN107576754AWide measurement rangeEasy to operateChemical analysis using titrationPreparing sample for investigationPotassium rhodanidePotassium iodine
The invention discloses a determination method of copper in raw gold, and belongs to a determination method of copper in raw gold. The determination method comprises the following steps: firstly usingnitric acid to dissolve most silver in a specimen, then adding hydrochloric acid to form an aqua regia system to completely dissolve the specimen, using sulphurous acid to precipitate and separate gold, filtering, using a filter residue to recycle the gold, adding sulfuric acid in filter liquor, and evaporating until the filter liquor is approximately dry, then using sulfuric acid to dissolve a precipitate, using ammonium hydroxide to adjust until blue copper ammonia complex ions appear, adding 0.5 g of ammonium hydrogen fluoride, shaking uniformly, adding 3 g of potassium iodide, instantly using a sodium thiosulfate standard titration solution to be titrated until the solution is light yellow, adding 5 mL of a starch solution, continuously titrating until the solution is light blue, adding 0.5 to 1.0 g of potassium rhodanide, intensively shaking until blue color is deepened, then titrating until blue color justly disappears, recording the volume V1 of the consumed sodium thiosulfatestandard titration solution, and calculating the content of copper in the raw gold. The determination method has the advantages that the content of the copper in the raw gold can be accurately determined, the method is applicable to mass analysis, and meanwhile the blank of the determination method for the copper content in the raw gold is filled.
Owner:CHANGCHUN GOLD RES INST
Industrialization production method of 2-mercapto-1-methylimidazole
Owner:XUZHOU B&C CHEM CO LTD
Uric acid detection method based on silver triangular nanoflakes
InactiveCN109270052AEasy accessThe synthesis method is simpleAnalysis by subjecting material to chemical reactionColor/spectral properties measurementsPotassium rhodanidePotassium thiocyanate
The invention discloses a uric acid detection method based on silver triangular nanoflakes. The uric acid detection method comprises the following steps that the silver triangular nanoflakes are prepared; a to-be-detected sample is added into the silver triangular nanoflakes, then potassium rhodanide is added, and at this moment, if the absorption peak at 400 nm is weakened and the absorption peakat 575 nm rises again, it is expressed that the to-be-detected sample contains uric acid. The detection method is high in flexibility and selectivity.
Owner:YUNNAN UNIV
Method for preparing high-quality potassium rhodanide by using coke oven gas waste liquor with sulfur and cyanogen removed
The invention discloses a method for preparing high-quality potassium rhodanide by using a coke oven gas waste liquor with sulfur and cyanogen removed. The method comprises the steps of: first adding an assistant S to the waste liquor to remove cyanide ions in the waste liquor system, wherein the addition is 50%-200% of the molar weight of cyanide ions; adding an assistant E according to the contents of carbonate radicals, bicarbonate radicals and sulfate radicals to remove the three, wherein the addition is 50%-200% of the total molar weight of the carbonate radicals, bicarbonate radicals and sulfate radicals; adding an assistant D and regulating the pH value to 4-10; and conducting concentration and decoloring with activated carbon, and concentrating and crystallizing to obtain a finished product. The method disclosed by the invention has simple process and low cost; and the output product contains more than 99 wt% of potassium rhodanide.
Owner:江苏燎原环保科技股份有限公司
Glaze with silver-like metal luster
The invention discloses a glaze with silver-like metal luster. The glaze with silver-like metal luster comprises a glass glaze, sodium dichromate, copper oxide, nickel oxide, refractory clay and potassium rhodanide. The glaze with silver-like metal luster has the advantages of reasonable formula, good work effects and low production cost.
Owner:严美云
Online rapid detection method for molybdenum content
InactiveCN101968449AWell mixedMaterial analysis by observing effect on chemical indicatorPotassium rhodanidePotassium thiocyanate
The invention discloses an online rapid detection method for molybdenum content, and aims to provide a method which is reasonably designed, simple, and easily implemented, and simultaneously can accurately and rapidly measure the molybdenum content of primary ammonia leaching solution. An implementation scheme comprises the following steps of: respectively adding sulfuric acid-copper sulphate-oxalic acid mixed solution into a plurality of molybdenum standard liquids with different molybdenum contents; respectively mixing uniformly; respectively adding potassium rhodanide-thiocarbamide mixed solution into the molybdenum standard liquids; respectively mixing uniformly again; respectively observing the color of each molybdenum standard liquid; adding the sulfuric acid-copper sulphate-oxalic acid mixed solution into a primary ammonia leaching solution to be detected; after mixing uniformly, adding the potassium rhodanide-thiocarbamide mixed solution into the primary ammonia leaching solution to be detected; after mixing uniformly, observing the color of the primary ammonia leaching solution; and comparing the color of the primary ammonia leaching solution with the colors of each of the molybdenum standard liquids, wherein if the color of the primary ammonia leaching solution is among the colors of each of the molybdenum standard liquids, then the molybdenum content of the primary ammonia leaching solution is qualified.
Owner:JIANGXI COPPER
Method for preparing triptolide derivative
InactiveCN102002093ANo heating requiredShort reaction timeSteroidsPotassium rhodanidePotassium thiocyanate
The invention provides a method for preparing a triptolide derivative, which comprises the following steps of: reacting triptolide used as a raw material respectively with tertiary butanol, oxalic acid, iodine and potassium rhodanide respectively at room temperature for 3 hours, separating, and then processing by using an aluminum peroxide column and recrystallizing to obtain the triptolide derivative. The invention has the advantages of no heating, short reaction time, easy easily obtained and low-cost material, simple and easy preparation method, low preparation cost, high yield and low isomer content and can be used to prepare effective component of Tripterygium wilfordii in a larger scale.
Owner:FUJIAN ACAD OF MEDICAL SCI
Analysis method for determining copper in tin-silver-copper solder through iodometry
InactiveCN104749170AEliminate distractionsReduce distractionsMaterial analysis by observing effect on chemical indicatorPreparing sample for investigationPotassium rhodanidePotassium iodine
The invention discloses an analysis method for determining copper in a tin-silver-copper solder through iodometry. The method comprises the steps of weighing a unit of a sample and putting into a 250 ml conical flask, adding a proper amount of concentrated sulfuric acid, heating, dissolving the sample, taking down the conical flask, cooling to room temperature, adding a proper amount of perchloric acid, heating till a perchloric acid white smoke is emitted after the sample is completely dissolved, dropwise adding hydrochloric acid for a plurality of times to remove tin, concentrating the solution to a small volume, taking down the flask, cooling to the room temperature, and shaking uniformly. Adding a proper amount of ammonium hydroxide solution into the sample to form a solution which is complex copper ammine ion blue, adding a proper amount of ammonium bifluoride, shaking till the blue disappears, cooling the flask to the room temperature with a cold water flow, standing for 30 seconds, adding a proper amount of potassium iodide, titrating with a sodium thiosulfate standard solution immediately to light yellow, adding a proper amount of potassium rhodanide and a starch solution, titrating continuously with the sodium thiosulfate standard solution till the blue disappears, and recording the milliliter quantity.
Owner:BEIJING INST OF NONFERROUS METALS & RARE EARTH
Bivalent cation magnetic ionic liquids and preparation method thereof
ActiveCN102167683BOvercome the disadvantage of uncontrollable magnetismImprove thermal stabilityOrganic chemistryMagnetic liquidsPotassium rhodanidePotassium thiocyanate
The invention relates to bivalent cation magnetic ionic liquids and a preparation method thereof, and belongs to the technical fields of novel chemical materials and preparation. N-alkyl imidazole, 1,m-dibromoalkane, 1,m-dicholoroalkane, ferric trichloride, lanthanide metal oxide, potassium rhodanide and aqueous solution of perchloric acid are taken as raw materials to be prepared into the bivalent cation magnetic ionic liquids with different anion structures; and compared with the conventional magnetic ionic liquid, the magnetic ionic liquids have high magnetism, magnetic controllability and higher thermal stability. The invention realizes magnetic designability of the magnetic ionic liquids for the first time, and promotes the application of the magnetic ionic liquids in the fields such as aviation, medicines, biology and the like.
Owner:INST OF PROCESS ENG CHINESE ACAD OF SCI
Chemical pretreatment method of steel products and used pickling solution
The invention discloses a chemical pretreatment method of steel products and a used pickling solution. The chemical pretreatment method of steel products comprises four procedures of pickling, degreasing, washing, and phosphorizing, wherein coarse alkali is adopted in degreasing fluid; acrylonitrile-ethylene-styrene (AES) and anionic polyacrylamide (APAM) surfactants are respectively utilized to solve the demands of a normal temperature process on an active agent in the pickling and degreasing procedures; molybdate iron phosphating liquid is adopted in phosphorization; the used acid liquor comprises the following components in grams per liter: 101-135 g / L of sulfuric acid, 3 g / L of potassium rhodanide, 3 g / L of teiethylene tetramine-hexacetic acid, 3 g / L of acetamidine hydrochloride and 3 g / L of di-o-tolyl-thiourea; the mass concentration of the sulfuric acid is 15-19%. The method is simple in process, fewer in procedures, and free of an external heating device; about 80% of water can be saved; equipment investment can be reduced; about 70% of electricity can be saved in normal operation.
Owner:ZOOMLION HEAVY MASCH CO LTD
The industrial production method of 2-mercapto-1-methylimidazole
The invention relates to an industrialization production method of antithyroid drug 2-mercapto-1-methylimidazole. The method comprises: (a) reacting vinyl acetate with bromine in absolute ethyl alcohol, regulating a pH value into alkalescence after reaction, obtaining a bromoacetaldehyde diethyl acetal crude product after extraction and desolventization, and directly adding the bromoacetaldehyde diethyl acetal crude product into a next step of reaction; (b) performing aminolysis reaction of bromoacetaldehyde diethyl acetal and methylamine aqueous solution, and after completing reaction, obtaining methylamino acetal through distilling, separating and purifying after extraction and de-watering; (3) dropping hydrochloric acid into aqueous solution of methylamino acetal and potassium rhodanide; removing water in the reaction solution by reduced pressure distillation after reaction, removing a part insoluble in ethyl acetate from the obtained solid, dissolving residual solid into water with pH being 1-2, crystallizing to obtain 2-mercapto-1-methylimidazole with purity higher than 99%, and then vacuum-drying to obtain a finished product. The production method has a short product line, can obtain 2-mercapto-1-methylimidazole with high purity, and has a strong industrialization prospect.
Owner:XUZHOU B&C CHEM CO LTD
A kind of determination method of silver content in high bismuth material
ActiveCN103926372BEasy to operateHigh precisionMaterial analysis by observing effect on chemical indicatorChemical analysis using titrationPotassium rhodanidePotassium thiocyanate
The invention discloses a method for measuring the content of silver in a high-bismuth material. The measuring method is characterized by comprising the following steps: quantitatively trapping precious metal in a sample with bismuth oxide as a trapping agent of precious metal; smelting the sample at the temperature of 900-1100 DEG C for 30-60 min to obtain a bismuth buckle; dissolving the bismuth buckle by nitric acid and tartaric acid under a heating condition; and titrating with a potassium rhodanide standard solution to measure the content of silver in the sample. The measuring method is simple to operate; the accuracy and recycling rate of the measuring method are high and meet the requirement of an analysis method; the impurity interference is small and the problem that the accuracy of measurement on the content of silver is low due to relatively high impurity content in a high-bismuth material sample is solved.
Owner:HUNAN SHUI KOU SHAN NONFERROUS METALS GRP
Solid culture medium for separating and purifying extremely thermoacidophilic archaea and preparation method thereof
The invention provides a solid culture medium for separating and purifying extremely thermoacidophilic archaea and a preparation method thereof. The solid culture medium comprises the following components: jelly powder, potassium rhodanide, ferrous sulfate, yeast powder, and a 9K basic culture medium. The preparation method (1L) comprises the following steps of: preparing liquid A, namely regulating the pH value of 400 to 550ml of distilled water to be between 1.8 and 2.5, and adding 2 to 3g of jelly powder; preparing liquid B, namely regulating the pH value of 150 to 300ml of 9K basic culture medium to be between 1.8 and 2.5, and adding 5 to 11g of potassium rhodanide and 5 to 9ml of yeast powder mother liquor (0.2g / L); preparing liquid C, namely adding 9 to 15g of ferrous sulfate into 50 to 100mL of 9K basic culture medium, regulating the pH value to be between 1.8 and 2.5, and filtering and sterilizing by a filter membrane; and sterilizing the liquid A and the liquid B at high temperature respectively, cooling for 5 to 10 minutes, filtering by using a gauze respectively, uniformly mixing with the liquid C, and adding the distilled water until the volume is 1L. The extremely thermoacidophilic archaea can be separated and purified by a plate method on the basis of the culture medium.
Owner:CENT SOUTH UNIV
Cleaning agent for cleaning dirt on printing and dyeing rotary drums and application of cleaning agent
InactiveCN109749865AGood descaling effectImprove solubilityInorganic/elemental detergent compounding agentsOrganic detergent compounding agentsPotassium rhodanideChemical reaction
The invention discloses a cleaning agent for cleaning dirt on printing and dyeing rotary drums and application of the cleaning agent. The cleaning agent in a formula comprises, by weight, 5-12 parts of oxygen acid, 0.2-1 part of potassium rhodanide, 2-4 parts of acetic acid, 2-4 parts of nitric acid, 2-4 parts of iron chloride, 0.1-0.8 part of permeating agents, 0.2-1 part of corrosion inhibitors,0.1-0.5 part of aniline, 0.1-0.6 part of emulsifiers and 100-150 parts of water. The mass fraction of the nitric acid is 3-5%. The cleaning agent and the application have the advantages that different types of oxygen acid jointly cooperate with the corrosion inhibitors, the permeating agents and the emulsifiers in the cleaning agent, and accordingly unique permeation, peeling, decomposition and diffusion effects and the like can be realized; decomposition and combination chemical reaction and the like in different forms can be carried out on the cleaning agent and the dirt, and accordingly the purpose of clearing the dirt without damage on the surfaces of equipment can be ultimately achieved by the cleaning agent.
Owner:唐勇
Preparation method of ultrahigh molecular weight polyethylene protofilament
InactiveCN105369593AGood antibacterialExcellent flame retardantBiochemical fibre treatmentHeat resistant fibresFiberPotassium rhodanide
The invention discloses a preparation method of ultrahigh molecular weight polyethylene protofilament. The method comprises the step of fiber finishing. According to the step of fiber finishing, 1, 1-2 parts by mass of dodecyl trimethyl ammonium sulfate, 2.6 parts by mass of azodiisobutyronitrile, 3.5 parts by mass of sodium carboxymethyl starch and 1.3 parts by mass of nanoscale aluminum hydroxide are added into 34 parts by mass of deionized water to be mixed and stirred to be uniform; 2, 4.2 parts by mass of sodium alkylarysulfonate, 1.7 parts by mass of asbestos ash, 3.6 parts by mass of potassium rhodanide and 2.8 parts by mass of N-methyl-pyrrolidone are slowly added at the same time for continuous stirring till sufficient and uniform mixing is performed to obtain a finishing solution; 3, hydroxyethyl cellulose fiber is padded in the finishing solution, taken out and dried at constant temperature. The preparation method of the ultrahigh molecular weight polyethylene protofilament comprises the step of fiber finishing, and the finished hydroxyethyl cellulose fiber has the excellent antibacterial, anti-flaming and anti-static performance.
Owner:CHANGSHU SUPERFIBER
Color change bar
The invention relates to a color change bar, which consists of a bent plastic outer tube and a glass capillary tube encapsulated inside the plastic outer tube, and is characterized in that sodium nitrite and ferric trichloride are encapsulated in the glass capillary tube, and potassium rhodanide, citric acid, EDTA (ethylene diamine tetraacetic acid), methylene green and tap water are encapsulated between the plastic outer tube and the glass capillary tube. When the bent plastic outer tube is used, the glass capillary tube fractures, and at the moment, raw material ingredients are mixed, and color change reaction is generated. The color change bar provided by the invention has the advantages that the structure is simple, the manufacture cost is low, and in addition, the environment is protected, and certain color change bars can realize the color change for many times. The color change bar belongs to an ideal toy for children.
Owner:SHANXI UNIV
A kind of steel chemical pretreatment method and used pickling solution
The invention discloses a chemical pretreatment method of steel products and a used pickling solution. The chemical pretreatment method of steel products comprises four procedures of pickling, degreasing, washing, and phosphorizing, wherein coarse alkali is adopted in degreasing fluid; acrylonitrile-ethylene-styrene (AES) and anionic polyacrylamide (APAM) surfactants are respectively utilized to solve the demands of a normal temperature process on an active agent in the pickling and degreasing procedures; molybdate iron phosphating liquid is adopted in phosphorization; the used acid liquor comprises the following components in grams per liter: 101-135 g / L of sulfuric acid, 3 g / L of potassium rhodanide, 3 g / L of teiethylene tetramine-hexacetic acid, 3 g / L of acetamidine hydrochloride and 3 g / L of di-o-tolyl-thiourea; the mass concentration of the sulfuric acid is 15-19%. The method is simple in process, fewer in procedures, and free of an external heating device; about 80% of water can be saved; equipment investment can be reduced; about 70% of electricity can be saved in normal operation.
Owner:ZOOMLION HEAVY MASCH CO LTD
A Metallographic Corrosion Method for Revealing Grain Boundary of Austenitic Stainless Steel
InactiveCN103499480BEasy to assembleEasy to operatePreparing sample for investigationPotassium rhodanideDistilled water
The invention relates to a metallographic phase corrosion method displaying austenitic stainless steel grain boundary. The method comprises two steps of preparation of corrodent and metallographic phase corrosion. After coarse grinding, fine grinding, polishing, washing and drying, a metallographic specimen has a bright polished surface without a scratch. The corrodent is characterized by being prepared through mixing 50-70ml of nitric acid with concentration of 65%, 1-3g of sodium chloride, 0.1-0.5g of potassium rhodanide, and 30-50ml of distilled water, the polished surface of the metallographic specimen is taken as an anode and is soaked in a corrosive liquid, a titanium plate is taken as a cathode and is corroded through electrifying, then the metallographic specimen is washed and dried. The metallographic phase corrosion method is simple to operate, has good reproducibility, and can clearly display the grain boundaries of large grains, small grains and large and small mixed grains in the austenitic stainless steel.
Owner:NANCHANG HANGKONG UNIVERSITY
Solid culture medium for separating and purifying extremely thermoacidophilic archaea and preparation method thereof
Owner:CENT SOUTH UNIV
Preparation method and application of 2, 6-bis(2,4, 6-triamino-5-pyrimidinazo)benzo(1, 2-d; 4, 5-d) bithiazole
InactiveCN106188100BHigh sensitivityImprove the coordination effectOrganic chemistryMaterial analysis by observing effect on chemical indicatorPotassium rhodanidePotassium thiocyanate
The invention belongs to the field of bis-azo compounds. The problem that in the prior art, the detection of the sensitivity and selectivity of heavy metal ion reagents is not ideal enough can be solved. Firstly, 2,6-diamidobenzo(1,2-d; 4,5-d)bithiazole is prepared from 4,4'-p-phenylenediamine, glacial acetic acid, potassium rhodanide and the like; secondly, 2,2'-[benzo(1,2-d; 4,5-d)bithiazole hydrazone]bimalononitrile is prepared from NaNO2 and other raw materials; finally, 2,6-bis(2,4,6-triamino-5-pyrinideazo)benzo(1,2-d; 4,5-d)bithiazole is obtained after guanidine nitrate and an NaOH ethanol solution react with an ethanol solution of the product obtained through the reaction in the second step. A method for detecting the Cu2+ concentration has the advantages of being rapid in response speed, high in selectivity, high in sensitivity and stable in testing system.
Owner:SHANXI DATONG UNIV
Color change bar
The invention relates to a color change bar, which consists of a bent plastic outer tube and a glass capillary tube encapsulated inside the plastic outer tube, and is characterized in that sodium nitrite and ferric trichloride are encapsulated in the glass capillary tube, and potassium rhodanide, citric acid, EDTA (ethylene diamine tetraacetic acid), methylene green and tap water are encapsulated between the plastic outer tube and the glass capillary tube. When the bent plastic outer tube is used, the glass capillary tube fractures, and at the moment, raw material ingredients are mixed, and color change reaction is generated. The color change bar provided by the invention has the advantages that the structure is simple, the manufacture cost is low, and in addition, the environment is protected, and certain color change bars can realize the color change for many times. The color change bar belongs to an ideal toy for children.
Owner:SHANXI UNIV
5-amino-1,2,4-thiadiazole compound and preparation method thereof
InactiveCN101781295BThe reaction process is simpleMild conditionsOrganic chemistrySodium methoxidePotassium rhodanide
The invention relates to a 5-amino-1,2,4-thiadiazole compound and a preparation method thereof. The preparation method comprises the following steps of: dissolving a cyan compound into methanol, adding a methanol solution of sodium methoxide, stirring at 20-50 DEG C for reacting for 3-4 hours, adding ammonium chloride for reacting at room temperature for 48 hours, evaporating a reaction solvent, washing by diethyl ether, then recrystallizing sequentially by water and alcohol, filtering, drying and obtaining an intermediate amidine compound; dissolving the intermediate amidine compound into water, slowly and dropwise adding a sodium hypochlorite water solution under ice water bath, heating to room temperature and stirring for reacting for 4-5 hours, filtering, washing by water, and drying;and dissolving a filter cake into methanol, slowly and dropwise adding the methanol solution of potassium rhodanide under the ice water bath, reacting at room temperature for 12 hours, filtering, rotatably evaporating the obtained filtrate, recrystallizing by methanol and water, filtering, and drying. The synthesized 5-amino-1,2,4-thiadiazole compound has the structure in a general formula (I). The invention has simple reaction process, mild conditions and less environmental pollution.
Owner:临沂明辉再生资源有限公司
Method for preparing triptolide derivative
InactiveCN102002093BNo heating requiredShort reaction timeSteroidsPotassium rhodanidePotassium thiocyanate
The invention provides a method for preparing a triptolide derivative, which comprises the following steps of: reacting triptolide used as a raw material respectively with tertiary butanol, oxalic acid, iodine and potassium rhodanide respectively at room temperature for 3 hours, separating, and then processing by using an aluminum peroxide column and recrystallizing to obtain the triptolide derivative. The invention has the advantages of no heating, short reaction time, easy easily obtained and low-cost material, simple and easy preparation method, low preparation cost, high yield and low isomer content and can be used to prepare effective component of Tripterygium wilfordii in a larger scale.
Owner:FUJIAN ACAD OF MEDICAL SCI
Coke oven gas desulfurization waste liquid recycling method
ActiveCN106007136ALow priceNo secondary pollutionWater/sewage treatment by centrifugal separationWater treatment parameter controlPotassium rhodanideFERRIC FERROCYANIDE
The invention relates to a coke oven gas desulfurization waste liquid recycling method. According to the technical scheme, a decolorising agent is added into filtered coke oven gas desulfurization waste liquid for discoloring to obtain faint yellow clarified waste liquid; the faint yellow clarified waste liquid is subjected to vacuum evaporation, concentrated liquid obtained after evaporation is centrifugally separated, and a salt mixture and filtrate I are obtained; an organic solventing-out agent and an extraction agent are used for refining the salt mixture, and potassium thiosulfate and potassium rhodanide are obtained; iron vitriol is added into the filtrate I, stirring is carried out, precipitate is obtained, acid pickling and centrifugation are carried out, and a ferric ferrocyanide product is obtained. The coke oven gas desulfurization waste liquid recycling method has the advantages of being easy to operate and low in cost; coke oven gas desulfurization waste liquid can meet the water quality requirements for biochemical treatment, the recycling rate of thiosulfuric acid radical and thiocyanate radical in the coke oven gas desulfurization waste liquid is high, and the product purity is high.
Owner:湖北民益环保科技有限公司
Method for preparing high-quality potassium rhodanide by using coke oven gas waste liquor with sulfur and cyanogen removed
The invention discloses a method for preparing high-quality potassium rhodanide by using a coke oven gas waste liquor with sulfur and cyanogen removed. The method comprises the steps of: first adding an assistant S to the waste liquor to remove cyanide ions in the waste liquor system, wherein the addition is 50%-200% of the molar weight of cyanide ions; adding an assistant E according to the contents of carbonate radicals, bicarbonate radicals and sulfate radicals to remove the three, wherein the addition is 50%-200% of the total molar weight of the carbonate radicals, bicarbonate radicals and sulfate radicals; adding an assistant D and regulating the pH value to 4-10; and conducting concentration and decoloring with activated carbon, and concentrating and crystallizing to obtain a finished product. The method disclosed by the invention has simple process and low cost; and the output product contains more than 99 wt% of potassium rhodanide.
Owner:江苏燎原环保科技股份有限公司
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