15 results about "Sodium cyanate" patented technology

The application discloses a method for preparing 2,6-dimethoxy-4-amino pyrimidine in a microchannel, and the method comprises the following steps: taking 2,4,6-trichloropyrimidine as raw material, and reacting with a sodium methoxide solution in a microreactor to obtain a methanol solution of 2,6-dimethoxy-4-chloropyrimidine; after post-treatment, 2,6-dimethoxy-4-chloropyrimidine is dissolved in toluene to obtain a toluene solution of 2,6-dimethoxy-4-chloropyrimidine; the toluene solution is reacted with a mixed solution of sodium cyanate, methanol, a palladium catalyst, a ligand and toluene to obtain (4,6-dimethoxypyrimidin-2-yl) methyl tert-butylcarbamate; and then, the (4,6-dimethoxypyrimidin-2-yl) methyl tert-butylcarbamate is reacted with hydrochloric acid to obtain 2,6-dimethoxy-4-amino pyrimidine. Compared with a traditional synthesis route, the method has the advantages of simple synthesis, simple operation, high yield, and no need of using highly toxic and high-risk materials, and the synthesis steps are greatly shortened by adopting a continuous synthesis mode of a microreactor.

The embodiment of the invention discloses a preparation method of acrylic isocyanate ester, which comprises the following steps: reacting substituted or unsubstituted acrylic acid as shown in a formula I with bromoethanol under the action of acid to obtain an intermediate mixture, and reacting the intermediate mixture with sodium cyanate under the action of a catalyst to prepare the acrylic isocyanate ester as shown in a formula II. According to the embodiment of the invention, the bromoethanol is used as a raw material to react with the substituted or unsubstituted acrylic acid, and then reacts with the sodium cyanate under the action of the catalyst to prepare the isocyanate acrylate with different substituent groups, so that the method is simple in process, low in equipment requirement, environment-friendly in material, low in cost, high in yield and suitable for large-scale industrial production.

The invention discloses an environment-friendly gold extraction agent which comprises the following raw materials: sodium cyanurate, sodium sulfate, sodium citrate and iron carbide. Wherein the mass content of sodium cyanurate is 65%-75%, the mass content of sodium sulfate is 15%-25%, the mass content of sodium citrate is 5%-9%, and the mass content of iron carbide is 1%-5%; the method has the advantages that the leaching rate is high, and meanwhile, the safety and environmental hidden dangers in the transportation, storage or use process can be reduced.

The invention relates to the technical field of salt extraction and recovery of sodium-process desulfurization waste liquid, in particular to a method and device for extracting product-grade sodium thiocyanate from sodium-process desulfurization waste liquid, and the method comprises the following steps: step a, primary decoloring treatment, step b, primary concentration crystallization, step c, secondary decoloring treatment, step d, freezing crystallization, step e, precise desalting, and step f, secondary concentration crystallization. A stepped process design of two-time decoloration, fractional crystallization and precise desalination is adopted, aiming at the physicochemical property difference of three core salts of sodium sulfate, sodium thiosulfate and sodium thiocyanate in the sodium-process desulfurization waste liquid, efficient separation is realized by accurately controlling process parameters, the sodium sulfate is preferentially separated out by utilizing the characteristic that the solubility of the sodium sulfate is relatively low at high temperature, and the sodium thiosulfate is separated out by utilizing a high-temperature crystallization method. The sodium thiocyanate is separated out in a targeted manner on the premise of ensuring that the sodium thiocyanate is in an unsaturated state, so that the technical problem that the sodium thiocyanate is easy to co-crystallize at low temperature is solved.

This invention relates to the field of oilfield chemical technology, and discloses a low-molecular-weight, high-viscosity ternary polymer flooding agent, its preparation process, and its application. The low-molecular-weight, high-viscosity ternary polymer flooding agent comprises the following raw materials by weight: simulated formation water: 986.2-995.9 g; sodium thiocyanate: 0.2-1.2 g; partially hydrolyzed polyacrylamide: 1.0-3.0 g; dodecyl hydroxypropyl sulfobetaine: 2.0-6.0 g; sodium salicylate: 0.9-3.6 g. The simulated formation water is prepared from deionized water, sodium chloride, calcium chloride, and magnesium chloride. Sodium thiocyanate is added to the simulated formation water to obtain a basic conditioning fluid; partially hydrolyzed polyacrylamide is added to obtain a polymer-based fluid; dodecyl hydroxypropyl sulfobetaine is added to obtain a mixed solution; and sodium salicylate is added to induce a rheological property transformation. This invention constructs a double interpenetrating network structure, solving the problems of insufficient viscosity enhancement and poor plugging.

The invention relates to a continuous synthesis process of 1-(2-chlorphenyl)-3-(1-methyl-1-phenylethyl) urea, and relates to the technical field of organic synthesis.The continuous synthesis process comprises the following steps that o-chlorobenzyl chloride serves as an initial raw material, a continuous reaction device I is filled with sodium cyanate, o-chlorobenzyl chloride is added for a reaction, and reaction liquid is obtained; and introducing the reaction liquid into a continuous reaction device II to react with alpha, alpha-dimethyl benzylamine, and transferring into a continuous reaction device III to perform curing reaction, thereby obtaining the 1-(2-chlorphenyl)-3-(1-methyl-1-phenylethyl) urea. The o-chlorobenzyl chloride serving as an initial raw material is changed into o-chlorobenzylamine without an amino substitution reaction and directly reacts with sodium cyanate to obtain o-chlorobenzyl isocyanate, so that the use of highly toxic phosgene in a traditional process is avoided, the synthesis steps are few, a multi-stage tubular filler reactor is adopted, efficient continuous production is realized, and the product has high yield and purity.

The present application relates to a kind of environmental protection type gold dipping agent and gold dipping method, belong to gold dipping technical field;The environmental protection type gold dipping agent includes sodium cyanate and guanidine salt.The gold dipping agent provided by the present application has good gold dipping effect, high gold selectivity, and does not contain traditional toxic sodium cyanide, has little environmental pollution, and is green and environmentally friendly.

This invention belongs to the field of gold extraction agent technology, specifically relating to a method for preparing a gold extraction agent. The invention provides a method for preparing a gold extraction agent, comprising the following steps: mixing sodium cyanate and iron powder, and carrying out a melt catalytic reaction to obtain the gold extraction agent. This invention uses iron powder as a catalyst, which can effectively promote the polymerization reaction of sodium cyanate. During the catalytic polymerization process, iron atoms can break the carbon-nitrogen triple bond in sodium cyanate into a carbon-nitrogen double bond, with one end of the carbon-nitrogen double bond linked to a sodium atom. The obtained gold extraction agent does not contain free cyanide ions and is therefore non-toxic. In application, the sodium in the obtained gold extraction agent can displace gold in gold ore, thus playing a role in gold refining. Test results from the embodiments show that the gold extraction efficiency of the gold extraction agent provided by this invention is comparable to that of sodium cyanide, and it is safe, environmentally friendly, and non-toxic.

A method for synthesizing a stable isotope-labeled toltrazuril-D3 belongs to the field of organic synthesis technology. This method uses methylamine hydrochloride-D3 as the stable isotope labeling source, reacting it with p-trifluoromethylthiophenol and 1-chloro-2-methyl-5-nitrobenzene as starting materials, undergoing sequential condensation and reduction to obtain an aminodiphenyl ether intermediate. Simultaneously, methylamine hydrochloride-D3 reacts with sodium cyanate to generate methylurea-D3, which then reacts with carbonyl diimidazole to obtain an activated intermediate. Finally, the aminodiphenyl ether intermediate condenses with the activated intermediate, followed by base-catalyzed cyclization to obtain the target product, toltrazuril-D3. This invention features a rationally designed synthetic route, readily available raw materials, mild reaction conditions, simple operation, and easy product separation and purification. The obtained product achieves a chemical purity and isotope abundance of over 99%.

The utility model discloses a kind of sodium thiocyanate solid-liquid separation equipment, including processing box, the top of processing box is passed through and is fixedly connected with its feed hopper, the inner wall of processing box is fixedly connected with separation frame, the bottom of feed hopper is fixedly communicated with the top of separation frame, the bottom of separation frame is passed through and is equipped with through opening, the inner wall of through opening is fixedly connected with screening net, the right side of separation frame is passed through and is equipped with discharge port. The utility model integrates solid-liquid filtration separation and solid drying function in the same main frame, without additional setting material transfer device or step-by-step operation process; through the collaborative design of hot air conveying and rotary stirring, hot air can be uniformly conveyed to the solid material area through the hollow structure, and the stirring assembly continuously turns the material during rotation, so that the hot air and the material are in full contact, effectively solving the problem of uneven local drying that easily occurs in traditional fixed drying structure.

The invention relates to the technical field of pesticide synthesis, and discloses a continuous synthesis method of thiophanate-methyl. The method comprises the following steps: preparing dry sodium thiocyanate into an aqueous solution, and continuously reacting with methyl chloroformate and a catalyst in a microreactor; and carrying out condensation reaction on the obtained intermediate and o-phenylenediamine dissolved in the composite solvent in series connection stirring kettles, and carrying out programmed cooling and crystal growing, separation, washing and drying to obtain the product. According to the method, side reaction is effectively inhibited, the product purity is high, the quality is stable, the production efficiency and the reaction yield are remarkably improved, and the microreactor and the reaction kettle are connected in series to realize whole-process continuous operation; by using the self-made efficient catalyst, the dosage of the catalyst is reduced, the reaction condition is mild, the reaction temperature is effectively reduced, the process time is shortened, meanwhile, the catalyst has no peculiar smell, the problem of irritating odor is avoided, and the operation environment is friendly.

The application provides a combination catalyst and application thereof, and belongs to the technical field of fine chemical industry.The combination catalyst is composed of a phase transfer catalyst, an antioxidant and a buffer agent; the phase transfer catalyst is a crown ether phase transfer catalyst; the antioxidant is one or more of dilauryl thiodipropionate, dioctadecyl thiodipropionate, triphenyl phosphite and pentaerythritol diphosphite; and the buffer agent is one or more of potassium carbonate, sodium hydroxide and sodium bicarbonate.The combination catalyst has high activity, and when used in the reaction of synthesizing sodium thiocyanate and chloropropyl triethoxysilane, the combination catalyst has mild conditions, small dosage, easy control, simple operation, short reaction time, high yield, few by-products, reduced production cost, and improved product yield and quality.

The utility model discloses a reaction device for wet synthesis of sodium cyanate, which comprises a dissolving kettle and a synthesis kettle, and the dissolving kettle is communicated with the synthesis kettle through a pipeline; the dissolving kettle and the synthesis kettle are communicated with the o-dichlorobenzene tank through pipelines, the synthesis kettle is communicated with the filter through a pipeline, and the filter is communicated with the mother liquor tank through a pipeline. According to the wet synthesis device disclosed by the utility model, the dissolving kettle and the synthesis kettle are matched with the material transfer pump to finish feeding, dissolving, stirring and reaction of raw materials, the condensation reflux of a solvent is finished through the plurality of groups of condensers, and the spraying and recycling of tail gas are finished through the plurality of groups of spraying towers matched with the material transfer pump, so that the content of sodium cyanate produced by the whole wet synthesis device is higher; meanwhile, the generated ammonia gas can be converted into ammonium carbonate to be recycled, so that the production cost and the environmental pollution are effectively reduced.

This invention discloses a simultaneous arsenic removal aid for gold stockpiles, comprising a core arsenic removal aid component and functional auxiliary components. The core arsenic removal aid component is sodium cyanate. The functional auxiliary components are selected from at least one of sodium cyanate, sodium hydroxide, sodium chloride, barium chloride, ferric chloride, sulfamic acid, disodium hydrogen phosphate, trisodium citrate, ferrous sulfate, and sulfuric acid. Sodium cyanate and the functional auxiliary components work synergistically to simultaneously remove arsenic and aid leaching of arsenic-containing materials in gold stockpiles during the cyanide leaching process. The advantages are high efficiency in arsenic removal, low toxicity and safety, compatibility with cyanide leaching processes, and controllable cost.