27 results about "Potassium thiocyanate" patented technology

The invention discloses a preparation method of a potassium-doped nitrogen oxidation phosphorescent catalyst, and belongs to the technical field of photocatalytic material preparation. The method comprises the following steps: by taking phosphorus oxynitride and potassium thiocyanate as raw materials, grinding and mixing, carrying out molten salt reaction at 400-600 DEG C for 1-5 hours, and cooling, washing and drying a reaction product to obtain the potassium-doped phosphorus oxynitride crystal. The method is simple in process, mild in reaction condition, low in cost and easy for large-scale production. Through potassium element doping, the visible light absorption range of phosphorus oxynitride is effectively widened, the recombination rate of photo-induced electron-hole pairs is remarkably reduced, and the carrier separation and transmission efficiency is improved, so that the photocatalytic activity of the material is greatly improved. The prepared K-PON photocatalyst has wide application prospects in the fields of photocatalytic reduction of uranium-containing wastewater, degradation of organic pollutants, energy conversion and the like.

This invention discloses a dimerized triarylmethane compound for blue photoresist color paste and its synthesis method. The compound is a dimerized blue triarylmethane compound A, which is prepared by the following steps: (1) reacting reactant B with diacid chloride as an acylation reagent to obtain intermediate C; (2) removing the Boc group from intermediate C to obtain intermediate D; (3) cyclizing intermediate D with potassium thiocyanate and acyl chloride reagent to obtain intermediate E; (4) reacting intermediate E with 4,4-bis(diethylamino)benzophenone to obtain F; (5) salting intermediate F to obtain the target dimerized triarylmethane compound A. The dimerized triarylmethane compound of this invention has excellent color performance and is suitable for blue photoresist color paste. It can significantly improve the brightness, transparency, contrast and dispersibility of the color paste, while also possessing high hiding power, strong tinting strength and good thermal and light stability.

The application belongs to the technical field of fluorocarbon surfactant application, and particularly discloses a synthesis method of sodium perfluorohexylethyl sulfonate, which comprises the following steps: (1) under the protection of nitrogen, perfluorohexylethyl iodine, potassium thiocyanate and a phase transfer catalyst are added into water and stirred to react, an organic layer is separated, and rotary evaporation is performed to obtain perfluorohexylethyl thiocyanate; (2) the perfluorohexylethyl thiocyanate is added into water and heated, and then chlorine is continuously introduced to stir to react, and filtration separation is performed to obtain perfluorohexylethyl sulfuryl chloride; and (3) the perfluorohexylethyl sulfuryl chloride is added into sodium hydroxide water solution drop by drop, and stirred to react, and after filtration, water washing, recrystallization and drying, the sodium perfluorohexylethyl sulfonate is obtained. The sodium perfluorohexylethyl sulfonate has high yield and high purity, has excellent surface activity, has excellent compounding performance with a hydrocarbon surfactant, has very good thermal stability, salt resistance and chemical stability, and meets the environmental protection requirements.

The invention belongs to the technical field of medicinal chemistry, and discloses a synthesis method of a flutomil compound, which comprises the following steps: (1) taking 4-fluoromethylbenzylamine and dihydroxy acetone as raw materials, and reacting with potassium thiocyanate in an acidic acetonitrile solution to synthesize an intermediate A; (2) carrying out oxidative desulfurization on the intermediate A and 2-6eq of peroxidant sodium nitrite in an acidic solvent to prepare an intermediate B; (3) further oxidizing the intermediate B into an intermediate C; and (4) reacting the intermediate C in the reaction mixed solution with n-heterocyclic carbene under a DBU alkaline condition to generate an active intermediate, and then degrading the active intermediate into the flutomi ester compound. The synthesis route is high in atom utilization rate, simple in post-treatment, free of high temperature and high heat in the reaction process, less in reaction waste liquid and low in environmental protection pressure, and compared with original literature patents, the reaction steps are few, reagents are cheap, and the process route is easy to implement, economical and efficient.

The invention discloses a synthesis method of a C-13 labeled mercapto triazole derivative. The synthesis method comprises the following steps: (1) carrying out a reaction on C-13 potassium cyanide and S8 to prepare C-13 potassium thiocyanate; (2) carrying out nucleophilic substitution reaction on C-13 potassium thiocyanate and a benzyl bromide compound to obtain a compound 1; (3) carrying out nucleophilic addition reaction on the compound 1 and formylhydrazine to obtain a compound 2; (4) further cyclizing the compound 2 under an alkaline condition to obtain a compound 3; and (5) carrying out derivative reaction on the compound 3 to obtain a C-13 labeled target compound. According to the synthesis method, multi-step continuous reaction is adopted, operation is easy and convenient, the yield is high, and the utilization rate of the C-13 marker is greatly increased.

The application discloses a copper plating composition and a chemical copper plating process, and relates to the field of copper plating compositions, which is composed of the following components: a copper salt providing divalent copper ions; a complexing agent for complexing the divalent copper ions; a stabilizer for stabilizing the copper plating composition, which is selected from at least one of the group consisting of 2,2'-dipyridyl, potassium selenocyanate, potassium thiocyanate and 2-mercaptobenzimidazole; a reducing agent for reducing the complexed divalent copper ions to metallic copper; an alkaline adjusting agent for adjusting the pH value of the composition to an alkaline range suitable for chemical copper plating; and a solvent. The process stability and product yield are improved: through the optimized combination of the core stabilizer, the complexing agent and the reducing agent, the self-decomposition of the copper plating bath is effectively inhibited, the process stability is significantly enhanced, the incidence of key defects such as backlight defects in the metalization of the circuit board hole is greatly reduced, and the high yield of the final product is ensured.

The invention discloses an adhesive for an amorphous strip and a preparation method of the adhesive, and relates to the field of adhesives. The invention discloses an adhesive for an amorphous strip. The adhesive comprises the following raw materials in parts by weight: 55-65 parts of epoxy resin; 15-23 parts of an episulfide epoxy resin; 8 to 15 parts of alkyl glycidyl ether with 12 to 14 carbon atoms; 3-7 parts of calcium carbonate powder; 0.8 to 1.5 parts of a titanate coupling agent; 2-5 parts of a thermal curing agent; the epoxy resin is prepared from bisphenol F type epoxy resin and episulfide epoxy resin through a reaction of bisphenol A type epoxy resin and potassium thiocyanate. The adhesive provided by the invention has good bonding strength, thermal stability and excellent water resistance to the amorphous strip, can meet the high-temperature and high-humidity environment requirements of the amorphous strip, and does not affect the soft magnetic performance of the amorphous strip.

The invention discloses a method for detecting the content of ferric iron in lubricating oil, and belongs to the technical field of lubricating oil quality detection. The method comprises the following steps: mixing 0.4-0.6 g of lubricating oil to be detected with 8-12 ml of diethyl ether to obtain a mixed solution; adding 0.15-0.25 ml of concentrated hydrochloric acid and 1.8-2.2 ml of a potassium thiocyanate solution into the mixed solution, oscillating, and standing for 4-6 minutes to generate an iron thiocyanate complex; and measuring the absorbancy of the ether phase by using a portable spectrophotometer, and calculating the content of the ferric iron in combination with a standard curve method. According to the method, laboratory fixing equipment is not needed, detection can be completed within 8-35 minutes, the oil sample dosage is only 0.4-0.6 g, the relative error is smaller than or equal to 2.35%, and the method is adaptive to low / high-viscosity lubricating oil, can be applied on site and in a laboratory and provides accurate data support for equipment operation and maintenance.

This invention belongs to the field of functional coating technology, specifically relating to an electrolyte for electrodeposition preparation of FeCoNiCu high-entropy alloy coatings and its application. The electrolyte includes FeSO4·7H2O, CoSO4·7H2O, NiSO4·6H2O, CuSO4·5H2O, H3BO3, sodium citrate, citric acid, NaCl, and additives. The additives are selected from at least one of o-phenanthroline, o-chlorobenzaldehyde, potassium thiocyanate, sodium 3-mercapto-1-propanesulfonate, and 4-(2-pyridinium azo)resorcinol. This electrolyte can prepare FeCoNiCu high-entropy alloy coatings with similar atomic ratios of metal elements in a one-step electrodeposition process, achieving co-deposition of four elements. The addition of additives can improve cathodic polarization, refine grains, and prepare a dense coating exhibiting excellent wear resistance. Simultaneously, the process is simple, low-cost, environmentally friendly, non-toxic, and safe.

The invention discloses a method for detecting the total iron content of lubricating oil, and solves the problems of no field detection method and large detection error in the prior art. The method comprises the following steps: weighing 0.1-1.0 g of an oil sample, placing the oil sample in a 40-60 ml quartz beaker, evaporating at 250-350 DEG C, and ashing at 600-800 DEG C; adding 1.5-2.5 ml of concentrated hydrochloric acid, boiling for 8-12 minutes, and carrying out acid leaching; transferring to a 8-12ml test tube, adding potassium persulfate and potassium thiocyanate to fix the volume to 8-12ml, and standing for 4-6 minutes; and carrying out colorimetric detection by using a 480-490nm spectrophotometer. The method is simple to operate, accurate and stable, adapts to fields and laboratories, and can quickly guide oil regeneration treatment.

This invention discloses a method for preparing a low-chlorine composite environmentally friendly antifreeze agent for coal transportation, belonging to the field of antifreeze technology. This invention addresses the technical problems of existing antifreeze agents for coal transportation, such as complex composition and poor antifreeze and metal corrosion resistance. The method for preparing a low-chlorine composite environmentally friendly antifreeze agent for coal transportation includes the following steps: mixing a compound pour point depressant, a modified corrosion inhibitor, a thickening stabilizer, and industrial water. The compound pour point depressant includes organic and inorganic pour point depressants; the organic pour point depressant is obtained by reacting unsaturated nitrile, sodium methyl methacrylate, and fumaric acid; the unsaturated nitrile is obtained by reacting intermediate B with benzaldehyde, and intermediate B is obtained by reacting triazole with ethyl chloroacetate; the modified corrosion inhibitor is obtained by reacting potassium thiocyanate, benzoyl chloride, and chitosan vanillin Schiff base. The antifreeze prepared by this invention has the advantages of moderate fluidity, good metal corrosion resistance, and good antifreeze performance.

The invention discloses application of potassium-doped nitrogen oxidation phosphorescence catalysis on acidic uranium-containing wastewater, and belongs to the technical field of photocatalytic materials. According to the application, the K-PON photocatalyst is directly put into acidic uranium-containing wastewater with the pH value of 0.5-6 and is used for reducing and removing U (VI). The K-PON is prepared by mixing and grinding phosphorus oxynitride and potassium thiocyanate according to a mass ratio of 1: (0.5-4), and calcining at 400-600 DEG C for 1-5 hours. The core advantage of the invention is that the prepared K-PON photocatalyst not only can efficiently reduce U (VI) under the illumination condition, but also has the unique memory photocatalysis characteristic, can continuously release stored electrons in a dark environment, realizes the continuous reduction of U (VI), and has a good application prospect. The problems that a traditional photocatalysis technology depends on continuous illumination and is inactivated in a strongly acidic environment are solved, and a new material and a new method are provided for efficient and all-weather treatment of the acidic uranium-containing wastewater.

The invention discloses a dimeric triarylmethane compound for blue photoresist color paste and a synthesis method of the dimeric triarylmethane compound. The compound is a dimerization blue triarylmethane compound A, and is prepared by the following steps: (1) taking diacyl chloride as an acylation reagent to react with a reactant B to obtain an intermediate C; (2) removing Boc groups from the intermediate C to obtain an intermediate D; (3) carrying out cyclization on the intermediate D, potassium thiocyanate and an acyl chloride reagent to obtain an intermediate E; (4) reacting the intermediate E with 4, 4-bis (diethylamino) benzophenone to obtain F; and (5) carrying out salt exchange on the intermediate F to obtain the target dimeric triarylmethane compound A. The dimerized triarylmethane compound has excellent colored light performance, is suitable for blue photoresist color paste, can remarkably improve the brightness, transparency, contrast ratio and dispersity of the color paste, and has high covering power, strong tinting strength and good thermal stability and light stability at the same time.

This invention discloses a polyethersulfone (PES) ammonia separation membrane based on imidazolium-cobalt coordination synergy and its preparation method, comprising the following steps: using polyethersulfone as a raw material, it undergoes a chloromethylation reaction under anhydrous conditions to introduce a -CH2Cl active site into the aromatic ring side chain of polyethersulfone, thereby obtaining chloromethylated polyethersulfone; the chloromethylated polyethersulfone is subjected to a nucleophilic substitution reaction with an imidazolium compound to obtain imidazolium-functionalized polyethersulfone with chloride ions as the counter ion; and after membrane formation, the imidazolium-functionalized polyethersulfone membrane is immersed in a mixed solution of potassium thiocyanate and cobalt chloride, utilizing the in-situ formed cobalt thiocyanate coordination anion to counteract the chloride ion. ‑ By performing a displacement reaction, a polyethersulfone ammonia separation membrane based on imidazolium-cobalt coordination synergy is obtained. The polymer membrane obtained in this invention has a stronger selective dissolution and enhanced transfer capability for ammonia, and can achieve efficient and stable ammonia enrichment in the separation of ammonia-containing mixed gases.

The application provides a precipitant for precipitating a silver base body, a preparation method and application, and the precipitant comprises potassium thiocyanate, an auxiliary complexing agent, trace rare earth elements, a synergist and trace selenium compounds; wherein the auxiliary complexing agent is at least one of pyrrolidone, N-ethyl-N-methyl aminoacetic acid or a combination thereof; the trace selenium compounds are sodium selenite or sodium selenate, the addition amount of the trace selenium compounds is 0.001%-0.05% of the total mass of the precipitant; and the mass ratio of the auxiliary complexing agent to the trace selenium compounds is 20:1-60:1. Through optimization of component allocation and auxiliary additives, rapid precipitation of silver elements is realized, and the application is suitable for various scenes such as element content analysis of silver alloy products and harmful element migration amount detection of silver tableware.

The invention relates to the technical field of separation and purification of natural functional components, in particular to a resin cross-linking agent, acylthiourea-containing rosin-based adsorption resin and a preparation method and application of the acylthiourea-containing rosin-based adsorption resin. The preparation method of the cross-linking agent comprises the following steps: reacting maleated rosin with SOCl2 to obtain an intermediate product A, reacting the intermediate product A with potassium thiocyanate, reacting the intermediate product B with aniline-o-methylaniline to obtain an intermediate product C, and reacting the intermediate product C with ethyl acetate and hydroxyethyl acrylate to obtain the cross-linking agent NMDMR. The adsorption resin is synthesized by taking NMDMR as a cross-linking agent and diethylbenzene (DVB) and methacrylic acid (MAA) as monomers through a suspension polymerization method. The PNS adsorption capacity of the obtained rosin-based resin is 221.11 mg / g, and the rosin-based resin has good adsorption separation and purification capacity on PNS, and is a renewable and efficient rosin-based resin adsorbent.

The invention discloses high-crystallinity carbon nitride colloid as well as a preparation method and application thereof. The preparation method comprises the following steps: uniformly mixing guanidine hydrochloride and potassium thiocyanate in an air-containing closed environment, calcining at 520-575 DEG C, and adding water to disperse. The specific raw materials guanidine hydrochloride and potassium thiocyanate are adopted, the product prepared through a specific process has high crystallinity, hydrophilicity and stability and further has excellent photocatalytic performance, and especially in catalysis of hydrogen production through water decomposition, the average hydrogen production activity within 5 h reaches up to 235.4 micromol.h <-1 > (17.1 times of that of bulk phase carbon nitride).

The application discloses a method for improving electrochemical carbon dioxide reduction to produce methane under acidic conditions of a copper-based catalyst by using potassium thiocyanate. The method adds potassium thiocyanate into an electrolyte for electrochemical carbon dioxide reduction under acidic conditions of a copper-based catalyst, or simultaneously adds a potassium ion-containing salt and a thiocyanate ion-containing salt, and the existing potassium thiocyanate salt in the electrolyte can effectively regulate the electronic structure of a Cu surface, promote deep hydrogenation of an intermediate in a carbon dioxide reduction reaction, thereby improving the selectivity of methane synthesis, and meeting the needs of industrialized carbon dioxide electro-reduction to produce methane.

The invention relates to the technical field of silver-coated copper powder, in particular to dendritic silver-coated copper powder with a high-temperature-resistant characteristic and a preparation method of the dendritic silver-coated copper powder. Comprising 60-80 parts of copper powder; 22 to 24 parts of silver nitrate; 29-36 parts of a reducing agent; 3-4 parts of a dispersant; 100 parts of a pickling solution; 100 parts of an alkali wash solution; 1-2 parts of a complexing agent; 5 parts of a surface modifier; 200 parts of ethanol; the potassium thiocyanate and the glutamic acid are introduced, the potassium thiocyanate can form a more stable protection layer on the surface of the silver-coated copper powder, the oxidation temperature of the silver-coated copper powder is greatly increased, the glutamic acid can improve the distribution uniformity of silver on the surface of the copper powder, and the oxidation temperature can also be increased.

This invention relates to a method for preparing 2-nitro-5-cyanothiobenzoic acid, comprising: (1) dissolving 5-amino-2-nitrobenzoic acid and an acid in a first reaction solvent, water, adding a nitrosating agent dropwise to the reaction system, reacting at a temperature of -20 to 20°C for 1 to 12 h, to obtain intermediate 3-carboxy-4-nitrobenzene diazonate M; the first reaction solvent is one or a mixture of water, acetonitrile, and ethanol; (2) reacting the intermediate 3-carboxy-4-nitrobenzene diazonate M obtained in step (1) with a thiocyanating agent and a catalyst in a second reaction solvent to undergo a nucleophilic substitution reaction, reacting at a temperature of -20 to 30°C for 1 to 24 h, to obtain 2-nitro-5-cyanothiobenzoic acid; the thiocyanating agent is selected from one or a mixture of cuprous thiocyanate, sodium thiocyanate, or potassium thiocyanate; the second reaction solvent is one or a mixture of water, acetonitrile, and ethanol. The raw materials of this invention are readily available, the cost is controllable, the reaction is mild, it is green and environmentally friendly, and it has high selectivity and high yield.

This invention relates to a method for preparing and applying a cobalt-deficient cobalt selenide-anchored high-loading Pt single-atom catalyst. Selenium powder is mixed with sodium hydroxide solution to obtain material A. Cobalt salt is mixed with EDTA-2Na solution to obtain material B. Material B and material A are mixed and subjected to a hydrothermal reaction. The resulting product is centrifuged, dried, and dispersed in anhydrous ethanol. Potassium thiocyanate powder is then added, and the mixture is ultrasonically exfoliated, centrifuged, washed, dried, and calcined to obtain Co-deficient cobalt selenide. This cobalt selenide is uniformly dispersed in an ammonium hydroxide aqueous solution. Under alkaline conditions, an ammonia solution containing tetraammineplatinum nitrate is added, and the reaction is carried out at room temperature for 24 hours. After centrifugation, washing, drying, and calcination, the desired product is obtained. This invention provides a simple preparation method that enables rapid and low-cost preparation of Co-deficient cobalt selenide under mild conditions. The Co-deficient cobalt selenide can anchor high-loading Pt single atoms, improving the stability of the Pt single atoms and thus enhancing the catalytic activity and selectivity of the catalyst for oxygen reduction to H₂O₂.

This invention belongs to the field of chemical separation and purification technology, and discloses a system and method for recovering 1,3-butadiene from C4 fractions through extractive distillation. The invention employs two extraction towers: a first extraction tower and a second extraction tower. The first extraction tower uses NMP as the extractant, while the second extraction tower uses NMP with potassium thiocyanate added as the extractant. The liquid phase collected from the bottom of the first extraction tower enters the second extraction tower, and the key product, butadiene, is obtained at the top of the second extraction tower. The butadiene product purity reaches over 98% (mass fraction). The energy consumption and operating pressure of the entire process are significantly reduced compared to traditional processes, greatly improving economic efficiency and showing promising application prospects.

The invention relates to the technical field of composite semiconductor photocatalysts, and discloses a semi-crystalline carbon nitride-based composite photocatalyst and a preparation method thereof.The method comprises the following steps that precursors are mixed, and melamine, thiourea and a part of molten salt mixture are ground; layered covering: uniformly covering the residual molten salt on the precursor mixture; and carrying out thermal polycondensation reaction, carrying out polycondensation at 450-550 DEG C, washing with water, and drying to obtain the catalyst. According to the preparation method, the visible light absorption capacity and the photon-generated carrier migration efficiency of the catalyst are improved, the consistency of potassium thiocyanate generation and element doping is promoted, and the technical problem that a traditional catalyst is prone to inactivation under the complex water quality condition is solved.

The invention relates to a method for determining the metal content of a potassium tetracyanopalladate chemical. The method comprises the steps of sample pretreatment, reaction precipitation, aqua regia dissolution and ICP-OES testing. The core of the method is to construct a two-stage digestion mechanism based on potassium thiocyanate induced precipitation-aqua regia / hydrogen peroxide synergistic oxidation. Palladium in the finally obtained clear solution exists in the form of a single and stable Pd (II)-chlorine complex, and completely meets the sample introduction and excitation requirements of ICP-OES (Inductively Coupled Plasma-Optical Emission Spectrometer). The whole process from sample weighing to result output can be completed within 40 minutes, which is far better than the operation period of several hours required by the traditional gravimetric method or titration method, and the dependence of the X-ray fluorescence method on the uniformity and surface state of the solid sample is avoided.

The invention discloses a method for determining the total iron concentration in a citric acid-EDTA decontaminant of a pressurized water reactor nuclear power plant, which comprises the following steps of: adding ammonium persulfate into the decontaminant for determining the concentration of citric acid and EDTA under an acidic condition to completely oxidize and convert Fe < 2 + > in a solution into Fe < 3 + >, adding a potassium thiocyanate-sulfosalicylic acid color developing agent, and measuring the total iron concentration of the citric acid-EDTA decontaminant. Judging the molar concentration ratio of EDTA (Ethylene Diamine Tetraacetic Acid) to Fe < 3 + > in the cleaning solution according to the color of the solution, when the solution is purple or dark red, titrating the test sample by adopting an EDTA standard solution, calculating to obtain the Fe < 3 + > concentration, and adding the Fe < 3 + > concentration and the theoretical iron concentration corresponding to EDTA in the cleaning solution to obtain the total iron concentration under the condition; and when the solution is colorless or faint yellow, determining the concentration of free EDTA in the test sample by adopting an Fe standard solution, then obtaining the molar concentration of EDTA consumed by Fe < 3 + >, and correspondingly obtaining the total iron concentration. The determination method is simple and rapid to operate and high in accuracy, and can meet the total iron concentration test requirements of the citric acid-EDTA decontaminant in the pressurized water reactor nuclear power plant primary loop equipment chemical decontamination process.

The application discloses an ionic carbon nitride photocatalyst, a preparation method thereof and a method for photocatalytically synthesizing a sulfenamide compound. The catalyst takes carbon nitride as a base, and carbon and metal cations are doped in the carbon nitride. (1) A carbon nitride precursor, a metal chloride and 2,4,6-triaminopyrimidine are mixed and ground, dried, and subjected to first high-temperature calcination at 500-600 DEG C for 3-5 hours, and then washed, dried and obtained as an intermediate product; (2) the intermediate product and potassium thiocyanate are mixed and ground, and subjected to second high-temperature calcination at 500-520 DEG C for 0.5-1.5 hours under an inert atmosphere, and then washed, dried and obtained as the ionic carbon nitride photocatalyst. A mercapto compound, an amine compound, the ionic carbon nitride photocatalyst and acetonitrile are subjected to photoreaction in an oxygen or air environment at 0.1-0.3 MPa and at 0-40 DEG C for 5-24 hours, and a sulfenamide compound is obtained. The ionic carbon nitride photocatalyst prepared by the application has a wide range of substrates and does not need to use an alkali assistant in the process of synthesizing the sulfenamide compound.