349 results about "Potassium cyanide" patented technology

The invention relates to a porous nitrogen-doped carbon supported cobalt nano-material, a preparation method and application thereof. The preparation method comprises the steps of dissolving a cobaltsource in a sodium citrate solution, having a hybrid reaction with cobalt potassium cyanide to obtain a Prussian blue similar nanocube; mixing and stirring with a dopamine aqueous solution in a buffering solution to obtain a dopamine coated cobalt-based Prussian blue composite material; after drying, annealing and roasting at a high temperature; then adding inorganic acid in a reaction kettle foracid-pickling to obtain the porous nitrogen-adopted carbon supported cobalt nano-material. The result shows that the material has a relatively good electronic transmission performance, a huge specificsurface area, good stability and many active site, has relatively good electrocatalytic activity in alkaline electrolyte and can serve as a three-function catalyst for oxygen precipitation, hydrogenprecipitation and oxygen reduction reaction.

The preparation method of the fungicide intermediate (E)-2-(2'-chloromethyl)-2-methicillin imino acetic methyl ester is: 1) the phenyl phthalate and the thionyl dihalide react with the influence of a catalyst; the catalyst is the Louis acid and phosphonic derivative; 2) the product of the first step and the alkali metal cyanide react with the influence of the organic solvent and phase transfer catalyst; the organic solvent is selected from the non-polar aromatic solvent or the halogen hydrocarbon; the phase transfer catalyst is selected from the halide of the four-level nitride or the ammonium salt; the alkali metal cyanide is selected from the sodium cyanide and potassium cyanide; 3) the products of the second step and the methanol react under the condition with the organic solvent and the chlorinated hydrogen; 4) the products of the third step and the methicillin amine hydrochloride under the condition with the organic solvent; thus, the target product can be got. The energy consumption and production risk of the present invention are obviously lowered; the relative collection rate is high; the safety in the production process is improved; and the present invention has no drawbacks such as the obstruction.

The invention discloses a stable electroplating solution which comprises an electroplating solution body; and the electroplating solution body is prepared from the following components: 15 to 30g/L of sodium stannate, 25 to 35g/L of sodium hydrogen phosphate, 40 to 60g/L of sodium nitrite, 25 to 40 g/L of potassium hydroxide, 15 to 25 g/L of potassium cyanide, 30 to 50 g/L of copper sulfate, 10 to 25 g/L of zinc oxide and 10 to 25 g/L of citric acid, and is obtained by adding a mixed solution of sodium stannate, sodium hydrogen phosphate and sodium nitrite into a mixed solution of potassium hydroxide, copper sulfate, potassium cyanide, zinc oxide and citric acid. Therefore, the stability of the electroplating solution can be improved; and as the components are mixed in batches, pre-reactions of the reaction liquids (components) are avoided in advance, and the temperature safety of the electroplating solution is improved.

The invention provides a method for preparing chlorinated-2-acetyl-1,10-phenanthroline amine iron (II) complex with the structural formula of formula (I) and an application of the obtained complex as an ethylene oligomerization catalyst, wherein variables in the formula (I) are defined in the specification. According to the method, triethyl aluminum which is adopted as an initial raw material in the process of the preparation of 2-acetyl-1,10-phenanthroline from 1,10-phenanthroline is hydrolyzed and undergoes an oxidation reaction with nitrobenzene to obtain 2-acetyl-1,10-phenanthroline, 2-acetyl-1,10-phenanthroline is condensed with substituted aniline to obtain a 2-acetyl-1,10-phenanthroline amine ligand, and the ligand is reacted with iron dichloride to obtain the complex. The synthetic method of the invention, which has the advantages of less step, simple technology, and catalyst preparation cost reduction, and adopts nontoxic triethyl aluminum to replace potassium cyanide used in routine preparation methods, has a wide industrialization prospect.

The invention discloses a preparation method of a hollow Ni2P/Co2P/Fe2P nano-composite electrocatalyst. The method comprises the following steps: preparing a nickel-cobalt precursor, used as a template, by using nickel acetate, cobalt acetate and polyvinylpyrrolidone as reaction materials and ethanol as a reaction solvent, adding potassium ferricyanide, and preparing a hollow Prussian blue analogthrough room temperature stirring by using ethanol and water as reaction solvents; and phosphating PBA in a tubular furnace at a low temperature with sodium hypophosphite as a phosphorus source to prepare the hollow Ni2P/Co2P/Fe2P nano-composite material. The hollow Ni2P/Co2P/Fe2P nano-composite electrocatalyst prepared in the invention has the advantages of high repeatability, simple and high preparation process, and superior catalytic activity and stability in electrocatalytic oxygen evolution reactions.

The invention discloses a method for surface modification of a copper indium gallium diselenide (Cu(In, Ga)Se2) film and relates to the technical field of photoelectric function materials and new energy. The method is characterized by comprising the following steps: depositing a metal film or an alloy film with a certain thickness on the (Cu(In, Ga)Se2) film, performing high temperature annealing on the (Cu(In, Ga)Se2) film under reactive atmosphere and carrying out a copper selenium secondary phase (CuxSe) reaction on the surface of the deposited metal or alloy and (Cu(In, Ga)Se2) film to form a copper selenium poly-metal compound with a wide band gap so as to fulfill the aim of removing CuxSe. By the surface modification method, the defect that toxicity exists and the environment cannot be protected in etching the CuxSe by the traditional modification method by adopting KCN (potassium cyanide) are overcome; the method has the advantages of being low in cost and high in reproducibility and being suitable for large-area film growth and the like; and with the adoption of method, the band gap width on the surface of the film can be improved, a gradient band gap is formed, the pn junction interface composition is obviously reduced, and the open-circuit voltage of a device is effectively improved.

A method of treating of glycosylated hemoglobin and in particular the process of hemoglobin isolation and preparation of a stable glycosylated hemoglobin in which the glycosylated hemoglobin remains liquid. The method comprises steps including separating human red blood cells from anti-coagulated blood, washing the human red blood cells with physiological saline and centrifuging the red blood cells and aspirating and discarding a resulting supernatant and white blood cell layer, lysing the packed red blood cells, mixing and freezing the cell/water mixture, defrosting, centrifuging, filtering and saving the supernatant, heating the supernatant, diafiltering the adjusting the hemolysate so that a final hemoglobin concentration is within specified limits. Additives may include potassium cyanide, carbon monoxide, and appropriate preservatives.

The invention discloses a Glufosinate-ammonium and its derivative improved preparation method, the method comprises the following steps: diethyl methyl-phoshphonite, acraldehyde and acetic anhydride are subjected to an addition reaction, a reactant, sodium cyanide (editpotassium cyanide for replacing) and an ammonia water solution of ammonium chloride are subjected to an improved STRECKER reaction without separation, the product is subjected to hydrolysis and ammonification for forming salt to obtain Glufosinate-ammonium. The preparation method has the characteristics of high selectivity and high yield.

The invention discloses a method for hardening the high-level liquid waste of alkali slag cement. The high-level liquid waste is pre-treated by ferrous nickel potassium cyanide, then Ca(OH)2 (calcium hydroxide) is utilized to neutralize and alkalify the liquid waste, and then the liquid is premixed and stored with the zeolite and mixed with the alkali slag and a stimulator, finally the liquid waste is hardened by pressurization under certain water-glue ratio to be a solidified body, the containing volume of the waste can reach 16% (counted by oxide). The method provides a new pre-treating and normal temperature solidification method so as to lead the high-level liquid waste to be solidified by the alkali slag at low temperature to obtain the solidified body with excellent performance.

The invention provides a method of preparing a complex represented by formula (I) of 2-n-butyryl-1,10-phenanthroline condensation amine ferric chloride (II) and application of the prepared complex as a catalyst for ethylene oligomerization, wherein variables in formula (I) are defined in the specification. According to the method, in the process of preparing 2-n-butyryl-1,10-phenanthroline from 1,10-phenanthroline, tri-n-butylaluminum is used as a starting material, then hydrolysis and an oxidation reaction with nitrobenzene are sequentially carried out so as to obtain 2-n-butyryl-1,10-phenanthroline, 2-n-butyryl-1,10-phenanthroline and substituted aniline undergo a condensation reaction so as to prepare 2-n-butyryl-1,10-phenanthroline condensation amine ligand, and the ligand reacts with ferrous chloride so as to obtain a target product. The synthetic method comprises a few procedures, is a simple process, enables preparation cost for the catalyst to be reduced and uses nontoxic tri-n-butylaluminium to substitute potassium cyanide used in normal preparation methods, thereby having a wide industrial prospect.

The invention provides a method for preparing a chlorinated 2-benzoyl-1,10-phenanthroline condensed amine iron (II) complex shown in formula I, and its catalytic application in ethylene oligomerization. The preparation method comprises the following steps: orderly performing hydrolysis and an oxidation reaction with nitrobenzene of initial reaction raw materials of 1,10-phenanthroline and benzyl lithium to obtain 2-benzoyl-1,10-phenanthroline, then performing condensation of 2-benzoyl-1,10-phenanthroline with substituted aniline to obtain 2-benzoyl-1,10-phenanthroline condensed amine ligand, and reacting the ligand with ferrous chloride to obtain a target product I. The synthetic method provided by the invention is few in steps, and simple in process, substitutes nitrobenzene for selenium dioxide in the prior art for the oxidation reaction, substitutes nontoxic benzyl lithium for hypertoxic potassium cyanide in the prior art, reduces the preparation cost of the catalyst, and has wide industrialization prospects.

The invention discloses a chemical oxidation method of surfaces of aluminum and aluminum alloys. The chemical oxidation method comprises the following working procedures of: oil removal, primary water-washing, primary bright-dipping, alkaline corrosion, secondary bright-dipping, conductive oxidation, secondary water-washing and drying, wherein a solution used in the conductive oxidation working procedure comprises the following component of: 3-7g/L of chromic anhydride, 1-4g/L of sodium fluoride and 0.5-2g/L of potassium ferricyanide, the solution temperature is 15-60 DEG C and the oxidation time is 5-20min. The chemical oxidation method disclosed by the invention has the advantages that: in the oxidation process, the solution is prepared according to the proportions of the chromic anhydride to the sodium fluoride to the potassium ferricyanide of (3-7): (1-4): (0.5-2(g/L)), the solution temperature is controlled at 15-60 DEG C, and the oxidation time is controlled to 5-20min, therefore protection layers generated on the surfaces of aluminum and aluminum alloy parts and component not only have better protection performance, but also have favorable electric conduction function and meet functional requirements of multiple products.

The invention provides a method for measuring the electroactive area of a three-dimensional porous membrane electrode, which comprises the steps of: respectively measuring cyclic voltammetry curves under different scanning speeds in potassium cyanide-containing and potassium cyanide-free kali salt or sodium salt solution with a three-electrode system and a potentiostat by taking a three-dimensional porous electrode or the three-dimensional porous membrane electrode which is deposited with a transition element ferricyanide semiconductor membrane, and measuring the electroactive area and the cover degree thereof with the reversibility of the redox reaction of the membrane electrode in different solution systems; and obtaining the active volume and the average membrane depth of the inner membrane of the three-dimensional porous membrane electrode by combining with the chronocoulometry. The method is simple and reliable, and has strong practicability.

The invention relates to a preparation method and a use of a hairyvein agrimony effective ingredient, and belongs to the traditional Chinese medicine effective ingredient extraction field. The preparation method comprises the following steps: a, taking the hairyvein agrimony and extracting the hairyvein agrimony by using a 75-95wt% ethanol aqueous solution with the weight being 8-12 times the weight of the hairyvein agrimony to obtain an extract; b, adding activated carbon to the extract, decoloring by heating reflux, filtering, and concentrating until no alcoholic smell to obtain a concentrated liquor; c, sieving the concentrated liquor, adding water to the concentrated liquor for diluting, putting the diluted concentrated liquor on macroporous adsorption resin, washing with water at first until the effluent I is colorless, and then washing with a 70-90wt% ethanol aqueous solution until the effluent II is identified with polyphenol to be negative by the ferric trichloride-ferric potassium cyanide to obtain an eluate; d, concentrating the eluate til no alcoholic smell, and then drying to obtain the hairyvein agrimony effective ingredient. The preparation method has the beneficial effect that the antioxidation effect is achieved by virtue of rational extraction, enrichment and separation methods; the preparation method can be applied to preparing the hairyvein agrimony effective ingredient of an oxidation resisting product.

A process for the preparation of a 5,5'-bi-1H-tetrazole diammonium salt by dropwisely adding the aqueous hydrogen peroxide to which a small amount of weakly acidic substance has been added, to a starting aqueous solution containing hydrogen cyanide or sodium cyanide or potassium cyanide, sodium azide and a catalytic amount of copper sulfate preferably at a low temperature to maintain the pH of the reaction solution over a range of from 5 to 6, heating the reaction solution to effect the oxidation and cyclization reaction, reacting the reaction product with ammonium chloride or an aqueous solution thereof, and recovering the formed ammonium salt in the form of sparingly soluble crystals. The desired product is obtained in a high yield and in a high purity from the starting materials which are cheaply available and are easy to handle through a decreased number of steps, i.e., through a one-pot reaction without requiring cumbersome after-treatment.

The invention discloses a novel synthetic process of hydrochloric acid trientine, and aims at providing the synthetic method of the hydrochloric acid trientine. The synthetic process can avoid using a highly-toxic material, namely potassium cyanide, and is temperate in reaction condition. A compound 2,2'-(2,2'-(ethane-1,2-diradical-bibenzyl-di (ethane-2,1-double radical)) bi isoindole-1,3-diketone is used as an initiator, after hydrazinolysis, an intermediate N1, N1'-(ethane-1,2-diradical) di(N1-nethyl ethane-1,2-diamine) is obtained. Through carbobenzoxy protection (Cbz protection), salt is generated,and dibenzyl 2,2'-(ethane-1,2-diradical-di (benzylamine-diradical)) di (ethane-2,1-diradical) dioctyl phthalatic acid aster hydrochloride is obtained so as to crystallize in ethanol through pressing catalytic hydrogenation deprotection to directly obtain the hydrochloric acid trientine. The synthetic process belongs to the organic synthetic technical field.

The invention relates to a plating process which comprises the following steps: (1) removing oil by using an organic solvent; (2) removing the oil by using ultrasonic waves; (3) washing by using water; (4) corrosively washing; (5) washing by using the water; (6) pickling; (7) washing by using the water; (8) activating; (9) washing by using the water; (10) immersing zinc; (11) washing by using the water; (12) chemically plating nickel; (13) washing by using the water; (14) pre-plating silver; (15) plating the silver, namely placing a metal part with the silver pre-plated into a plating solution at the temperature of 10-35 DEG C, and controlling the current density between 0.3 A/dm<2> and 0.4 A/dm<2>, wherein a silver plating solution comprises the following components by weight: 30-45 g/L of silver chloride AgCl, 70-120 g/L of potassium cyanide KCN and 0.5-2 g/L of sodium thiosulfate Na2S2O3.5H2O; (16) recovering; (17) washing by using the water; (18) immersing an anti-blushing agent; (19) drying. The plating process disclosed by the invention can be used for overcoming the defects of poor clad layer binding force and no clad layer on a deep recessed part of the traditional silver plating technology.

The invention provides a method for preparing a chlorinated 2-isobutyryl-1,10-phenanthroline ferrous aniline condensate (II) complex of a formula (I) and application of the complex serving as an ethylene oligomerization catalyst. Each variable of the formula (I) is defined as the specification. The method comprises the following steps of: selecting triisobutyl aluminum as an initial raw material in the process of preparing 2-isobutyryl-1,10-phenanthroline from 1,10-phenanthroline, sequentially performing hydrolysis and oxidation reaction with nitrobenzene to obtain 2-isobutyryl-1,10-phenanthroline, condensing the 2-isobutyryl-1,10-phenanthroline and substituted aniline to obtain 2-isobutyryl-1,10-phenanthroline aniline condensate ligand, and reacting the ligand with ferrous chloride to obtain the target product. The synthesizing method is few in steps and simple in process, and reduces the preparation cost of the catalyst; and by substituting the nontoxic triisobutyl aluminum for the potassium cyanide in the conventional preparation method, the method has a broad industrialized prospect.

The invention provides a novel color-developing agent luminosity analytical method for measuring hydrogen cyanide content in mainstream smoke quickly, which comprises the following steps of: pretreating a sample in which hydrogen cyanide in the mainstream smoke is collected, adding a color-developing agent, and quantifying by a luminosity analytical method, wherein the color-developing agent is 4-nitrobenzaldehyde and o-dinitrobenzene; preparing potassium cyanide (KCN) solution which is added with the color-developing agent and has different concentrations to make a standard curve; and quantifying the standard curve by an external standard method, adding the color-developing agent in a cigarette absorption liquid sample, and performing photometry detection at wavelength 533 nm by an ultraviolet spectrophotometer. In the method adopting the color-developing agent containing 4-nitrobenzaldehyde-o-dinitrobenzene, the selectivity and sensitivity are high, a reaction is completed instantaneously and the interference resistant capacity is high. In addition, the method is simple in operation, cigarette sidestream smoke can be detected, the HCN in smoke environment also can be analyzed qualitatively and semiquantitatively, and the method is also suitable for field detection.

The invention discloses a method for preparing super-micro molecular iron dextran by using super-micro molecular dextran (a weight-average molecular weight being 3,000-6,000Da) as a raw material. After the super-micro molecular dextran is subjected to oxidation, complexing, desalting, concentration preparation, filtration and encapsulation sterilization, an iron dextran injection product with an iron content of 25-250 mg/ml can be obtained, and the super-micro molecular iron dextran can be used for preventing and treating the iron-deficiency anemia of piglets and livestocks. According to the method for preparing the super-micro molecular iron dextran, a conventional potassium cyanide method and an alkali method are replaced by adopting oxydol/aqueous alkali oxidation, and a sodium hypochlorite method is improved; an alcohol precipitation method is replaced by using an electric dialyser method to remove the sodium chloride in iron dextran solution; simultaneously, the impurity removal working procedure of an intermediate product is further omitted; the production cost is decreased; the energy consumption is decreased; the production period is shortened; the toxicity is decreased; the emission of waste gas, waste water and industrial residues is reduced; the environmental pollution is reduced; and the production potential safety hazard caused by the usage of flammable and explosive alcohol is eliminated.

The present invention discloses a clean method for preparing a D,L-methionine comprising the steps of: preparing a potassium cyanide solution using a crystallized mother solution containing potassium carbonate as an absorbing liquid to absorb hydrocyanic acid, then reacting the potassium cyanide solution with 3-methylthio propionaldehyde and an ammonium bicarbonate solution at 50-150° C. for 3-15 minutes so as to obtain a 5-(β-methylthioethyl)glycolyurea solution, then bring the 5-(β-methylthioethyl)glycolyurea solution to a temperature of 140-220° C. and subjecting to a saponification reaction for 2-5 minutes, after the completion of the saponification, reducing the temperature to 0-40° C., extracting with an organic solvent, neutralising the water phase with CO₂ and crystallizing, then filtering, washing, and drying to obtain an acceptable D,L-methionine product; bring the crystallized D,L-methionine mother solution from filtration to a temperature to 110-160° C. to remove CO₂, which are all then circulated and used as a hydrocyanic acid-absorbing liquid. The process route of the present invention is a route suitable for a continuous and clean production, substantially without producing waste water and waste gas.

The invention discloses a method and system for forming a Cu-In-Ga-S-Se absorption layer and a cadmium sulfide buffer layer in an antivacuum way. The method comprises the steps of: in specific to a substrate with a back electrode layer under antivacuum, forming a coating layer from mixed slurry on the back electrode layer, primarily drying, compacting the coating layer by using a compacting device, carrying out primary S-Se reaction treatment to form a primary Cu-In-Ga-S-Se layer, thermally treating to improve the lattice matching of the primary Cu-In-Ga-S-Se layer, carrying out miscellaneous-phase removal treatment by using potassium cyanide or bromides to remove miscellaneous-phase cuprous selenide and copper sulphide, carrying out post-stage S-Se reaction treatment to generate a needed post-stage Cu-In-Ga-S-Se absorption layer, and finally, forming a cadmium sulfide buffer layer on the Cu-In-Ga-S-Se absorption layer by using a chemical-tank water bath method.

The invention provides a method for preparing a coordination compound chlorination2-formoxyl-1, 10-phenanthroline condensation amine and iron (II) in a formula (I) and application of the coordination compound as an ethylene oligomerization catalyst. Variants in the formula (I) are defined in the specification. In the process for preparing 2-formoxyl-1, 10-phenanthroline by 1, 10-phenanthroline, the method adopts trimethyl aluminum as a starting material and then conducts hydrolysis and oxidizing reaction with nitrobenzene to obtain 2-formoxyl-1, 10-phenanthroline, then the 2-formoxyl-1, 10-phenanthroline is condensed with substitution aniline to obtain 2-formoxyl-1, 10-phenanthroline condensation amine ligand, and the ligand reacts with ferrous chloride to obtain the target product. The preparation method is few in step and simple in process, reduces catalyst preparation cost, adopts non-toxic trimethyl aluminum to replace potassium cyanide used in a routine preparation method, and is wide in industrial prospects.