600 results about "Sodium sulfites" patented technology

The invention relates to a sodium hydrosulfite production risk assessment method and system based on multi-source data fusion. The system comprises a production process data acquisition module, a key variable linkage analysis module, a real-time risk detection module, a dynamic risk trigger analysis module and a comprehensive risk score calculation module. The method not only improves the risk assessment precision in the sodium hydrosulfite production process, but also realizes effective risk early warning and control through real-time and dynamic monitoring and regulation means. Meanwhile, the method fully combines the particularity of the sodium hydrosulfite production process, has significant value in safety guarantee, production efficiency improvement and management optimization, and establishes a new risk assessment normal form with scientificity and practicability for the chemical industry.

The invention discloses a high-temperature-resistant lignite resin and a preparation method thereof, and belongs to the field of drilling fluids, and the preparation method comprises the following steps: obtaining and preparing an extracting solution containing humic acid from lignite; adding hydrochloric acid into the extracting solution, separating, filtering and precipitating, dissolving the precipitating in a sodium hydroxide solution to obtain a humic acid solution, adding formaldehyde and sodium pyrosulfite into the humic acid solution, preheating to 80 DEG C, adding the extracting solution, heating to 110-130 DEG C, continuously stirring, reacting for 1-3 hours, and cooling to 60 DEG C or below to obtain a reaction product; transferring a reaction product to a neutralizing tank, dropwise adding a NaOH solution, adjusting the pH value to 10-11, and controlling the temperature below 55 DEG C; the mass ratio of the dry basis mass of sulfonated humic acid to ECH is 1: (0.05-0.15), the temperature is kept at 45-55 DEG C, the stirring speed is 400-600 rpm, and the reaction is performed for 2-4 hours; meanwhile, a NaOH solution is continuously added, and the pH is kept at 10-11. Adjusting the pH value of the reaction liquid to 7-8 by using dilute HCl, and terminating the reaction; and obtaining a resin product.

The invention provides a preparation method of 4-fluoro-3, 5-dimethylphenylhydrazine hydrochloride, which comprises the following steps: salifying 4-fluoro-3, 5-dimethylaniline serving as a substrate with concentrated hydrochloric acid, reacting with sodium nitrite to prepare a diazo solution, reducing the diazo solution into corresponding phenylhydrazine by using alkaline sodium sulfite as a reducing agent system, and reacting the 4-fluoro-3, 5-dimethylphenylhydrazine hydrochloride with the diazo solution to prepare the 4-fluoro-3, 5-dimethylphenylhydrazine hydrochloride. And acidizing the 2, 5-dimethyl phenylhydrazine to obtain corresponding phenylhydrazine hydrochloride. According to the preparation method, sodium sulfite which is low in cost and easy to obtain is used as a reducing agent, the defects that metal residues are high, the environment is prone to being polluted and the raw material cost is high due to the fact that a metal reducing agent is adopted when phenylhydrazine hydrochloride is prepared in the prior art are overcome, the reaction is completed in a water phase, no organic solvent is adopted, and the concept of green chemistry is met; and the problems of complicated post-treatment and easy pollution caused by the adoption of an organic solvent can be effectively avoided.

The invention discloses a yellow reduction dyeing agent, a dyeing solution and a preparation method and application thereof, and relates to the technical field of dyeing and finishing. According to the yellow reduction dyeing agent provided by the invention, the 5-hydroxy-3-aminopyridine-2, 6-(1H, 3H)-diketone is adopted as a reduction dye, and the sodium sulfite is independently used as a reducing agent for reduction dyeing, so that the obtained dye leuco body is proper in dyeing capacity, and a dyed fabric can show excellent light brittle damage resistance. The fabric dyed by the dyeing agent has similar breaking strength before and after dyeing and even is slightly improved after dyeing and illumination, meanwhile, the color depth K / S of the fabric dyed by the dyeing agent reaches 3.2 or above, the dry and wet rubbing color fastness can reach level 4 or above, and the color fastness to illumination reaches level 6 or above.

The invention relates to the technical field of preparation of an electrolyte for a vanadium redox flow battery, in particular to a reduction method of an alkaline vanadium-containing solution during short-process preparation of a vanadium electrolyte. The reduction method comprises the following steps: (1) adding a reducing agent sodium sulfite into an alkaline vanadium-containing solution and dissolving; and (2) acid is added into the solution obtained after dissolving in the step (1), the pH is adjusted, a reduction reaction is conducted, and vanadium is reduced to be tetravalent. The method provided by the invention effectively solves the problem of vanadium loss caused by precipitation generated in the sequential operation process of acidification and reduction of the alkaline vanadium-containing solution in the prior art, and meanwhile, the method provided by the invention is easy for engineering implementation.

The present invention provides a preparation method of high-viscosity hydroxypropyl methylcellulose. A preparation method of high-viscosity hydroxypropyl methylcellulose comprises the following steps: grinding and alkalizing refined cotton cellulose; adding methyl chloride and propylene oxide for etherification reaction; successively adding a crosslinking agent and an aqueous fulvic acid solution for reaction; adding potassium naphthylacetate, sodium sulfite and sodium molybdate and then drying. In the present invention, during the etherification reaction of alkalized cellulose, a crosslinking agent prepared by mixing sodium tetraborate and sodium tripolyphosphate is added for crosslinking reaction, which can reduce the content of water-soluble groups of the prepared hydroxypropyl methylcellulose, achieving the effect of increasing the viscosity of hydroxypropyl methylcellulose. Coating the crop surface with the high-viscosity hydroxypropyl methylcellulose not only has a better surface glazing effect, but also can increase its sugar content.

The invention provides high-performance silver powder suitable for TOPCon battery fine grid silver paste, a preparation method of the high-performance silver powder and the silver paste, and belongs to the technical field of photovoltaic materials. The preparation method comprises the steps that a silver salt solution and a composite reducing agent are mixed, a first-stage hydrothermal reaction is carried out at the first temperature, a second-stage hydrothermal reaction is carried out at the second temperature, and silver powder is obtained after centrifugation, washing and drying; wherein the composite reducing agent is selected from a mixture of two of potassium tartrate, sodium sulfite and ferrous sulfate. According to the method, gradual growth and crystallinity improvement of silver crystal nucleuses are achieved through two-stage heating, particle aggregation or uneven morphology caused by rapid reduction is avoided, in addition, the adopted composite reducing agent combination is remarkably superior to a single reducing agent (such as ascorbic acid), and the morphology and particle size distribution of the silver powder can be more accurately regulated and controlled.

The invention relates to the technical field of industrial wastewater pollution treatment, in particular to a graded recovery method for copper and arsenic in wastewater. According to the method, the copper ions and the trivalent arsenic ions in the wastewater are respectively recovered by adopting sodium hydrosulfite under the condition of different pH values, so that the elementary substance copper and the elementary substance arsenic are obtained. According to the method, efficient graded recovery of copper and arsenic can be realized without introducing excessive substances; the treated wastewater can also reach the discharge standard, so that the effective treatment of the wastewater is realized; the method is simple to operate, high in efficiency, low in cost and wide in applicability.

The invention discloses modified humic acid as well as a preparation method and application thereof, and relates to the technical field of humic acid modification. The preparation method comprises the following steps: activating mineral source humic acid, and adding a manganese-based activator to obtain activated humic acid; adding activated humic acid, a grafting agent and a silane monomer into a cross-linking system, stirring, standing, and then heating for reaction; after the reaction is finished, adjusting the pH value to be alkaline, keeping heating and stirring, and then drying to obtain modified humic acid; wherein the grafting agent comprises the following raw materials: sodium sulfite and acetylacetone. The modified humic acid still has high water solubility in hard water, and flocculent precipitate formed by the humic acid and metal ions can be avoided.

The invention discloses an iron-based layered silicate material for efficiently removing variable-valence heavy metals and water treatment application of the iron-based layered silicate material, and belongs to the technical field of water treatment.The preparation method of iron-containing layered silicate minerals comprises the following steps that ferrous sulfate heptahydrate is dissolved in water, sodium dithionite and sodium orthosilicate are sequentially added, stirring is conducted, and a mixture is obtained; stirring, homogenizing and aging for two hours; the hydrothermal reaction kettle is used for reacting in a high-temperature and high-pressure environment; according to the iron-containing layered silicate mineral material, a unique layered structure similar to natural iron-containing layered silicate minerals and high adsorption performance are reserved, variable-valence heavy metal arsenic in a wastewater solution is synergistically and efficiently removed by means of the oxidation-reduction activity of the iron-containing layered silicate mineral material and induction of generation of Fenton-like reaction, and the iron-containing layered silicate mineral material is obtained. The method disclosed by the invention shows high treatment efficiency, environmental friendliness and remarkable economic benefits, and is expected to exert remarkable environmental benefits in the field of water treatment.

The invention relates to the technical field of photocatalysis, and provides a preparation method of a copper-cuprous oxide-copper bismuthate ternary complex, which comprises the following steps: adding sodium bismuthate dihydrate, copper sulfate and sodium sulfite into a hydrothermal reaction kettle containing distilled water to obtain a solid-liquid mixture; and the solid-liquid mixture generates the copper-cuprous oxide-copper bismuthate ternary compound under a hydrothermal condition through a synergistic effect of a heterogeneous interface in-situ oxidation-reduction reaction of sodium bismuthate and a sodium sulfite solution and a homogeneous oxidation-reduction reaction of a copper sulfate solution and the sodium sulfite solution. The preparation method has the advantages that the elemental copper-cuprous oxide-copper bismuthate ternary compound is prepared by a one-pot method through cooperation of the out-phase interface in-situ oxidation-reduction reaction and the homogeneous oxidation-reduction reaction, and the preparation method is simple in preparation step, convenient to operate and easy to quantitatively control.

The invention discloses a method for producing a green packaging material by using field planting tobacco waste, which comprises the following steps: by taking tobacco stems as raw materials, extracting to obtain high-purity nicotine, extracting active chemical components to obtain tobacco stem residues, primarily treating the residual tobacco stems by an extruding and tearing machine to cut off and separate the tobacco stems into shreds, and drying the shreds to obtain the green packaging material. The cut tobacco stems enter a closed reaction bin, steam heating is adopted, ammonium sulfite or sodium sulfite and sodium hydroxide are added, EDTA and the ammonium sulfite or sodium sulfite and sodium hydroxide solution can dissolve fibrous adhesive lignin in the tobacco stems, and the tobacco stems can be used for producing green packaging materials after further mechanical treatment. Tobacco stem waste residues obtained after nicotine and pectic substance extraction are used as plant fiber paper pulp for producing the green packaging material, holocellulose in the tobacco stem residues is fully recycled and subjected to high-value resource utilization, the waste recycling value is increased, and the problem of waste environmental pollution is solved.

The invention discloses a filtering aid method for improving the filtering efficiency of monazite superior soluble slag, which comprises the following steps: step 1, carrying out solid-liquid separation on mixed slurry after alkali cake superior soluble callback to obtain filter residue 1 and filtrate 1; step 2, adding water into the filter residue 1, mixing and stirring according to a liquid-solid ratio of (1-2.5): 1 to react for 0.5-4 hours, and carrying out solid-liquid separation on ore pulp after the reaction to obtain a filter residue 2 and a filtrate 2; 3, if the ore pulp filtering speed in the step 2 is lower than 20 L / (m < 2 > * h) or the water content of obtained filter residues 2 is larger than 60%, the step 2 is repeated for the filter residues 2, the composite reducing agent with the preset mass is added, and stirring reaction is conducted for 2 hours till the water content of the filter residues is smaller than or equal to 60% or the ore pulp filtering speed in the plate and frame filtering process is larger than or equal to 20 L / (m < 2 > * h); in the step 3, the mass ratio of the added composite reducing agent to the original dry slag is (5-50) kg: 1t, and the composite reducing agent comprises sodium sulfite and thiourea in the mass ratio of (1-2): 1. The invention aims at shortening and improving the slag filtering performance so as to shorten the filtering time.

The invention belongs to the technical field of synthetic ester, and particularly relates to a preparation method of fatty acid pentaerythritol ester base oil, which comprises the following steps: carrying out esterification reaction on pentaerythritol and fatty acid in the presence of a catalyst and a color retention agent, and carrying out post-treatment to obtain the fatty acid pentaerythritol ester base oil, the catalyst comprises at least one of stannous octoate, stannous oxalate, stannous oxide, tetrabutyl titanate, isopropyl titanate and sodium hydrogen sulfate; the color retention agent comprises at least one of sodium hypophosphite, hypophosphorous acid, activated carbon and sodium sulfite. The color retention agent sodium hypophosphite is matched with the specific catalyst such as stannous oxalate, so that the petroleum color number of the produced fatty acid pentaerythritol ester base oil is smaller, and meanwhile, the esterification reaction time is shorter.

The invention provides a method for treating discharge wastewater of a waste lithium battery, which comprises the following steps: S1, pulping a lithium cobalt oxide material by using discharge wastewater, and adding a first oxidant for reaction to obtain primary oxidized slurry; s2, mixing the primary oxidized slurry with high-grade matte nickel, and adding a second oxidizing agent for reaction to obtain secondary oxidized slurry; s3, the secondary oxidation slurry and an iron circulation activating agent are mixed for acid leaching, a liquid phase is taken after solid-liquid separation, and metal leaching liquid containing nickel and cobalt is obtained; wherein the first oxidizing agent comprises persulfate, the second oxidizing agent is selected from hydrogen peroxide, and the iron circulation activating agent is at least one of sodium hydrosulfite or sodium pyrosulfite. According to the method, short-range efficient selective recovery of valuable metals is realized through cooperation of lithium cobalt oxide and high nickel matte, the influence on the environment is greatly reduced, and the economic cost of the process is reduced.

The invention relates to the technical field of water treatment agents, and particularly discloses an anti-corrosion deoxidizing composite agent for geothermal well recharge water and a preparation method of the anti-corrosion deoxidizing composite agent. The invention relates to an anti-corrosion and deoxidizing composite agent for geothermal well recharge water. The anti-corrosion and deoxidizing composite agent comprises the following raw materials: 30-40 parts of double modified sodium sulfite, 10-20 parts of a corrosion inhibitor, 8-15 parts of a scale inhibitor, 5-10 parts of amino trimethylene phosphonic acid, 5-10 parts of etidronic acid, 3-8 parts of polyethylene glycol monomethyl ether acrylate and 40-50 parts of deionized water. The dual-modified sodium sulfite is obtained by sequentially modifying sodium sulfite with a silane coupling agent and acrylic acid. The corrosion-resistant and oxygen-removing composite agent has the advantage of being high in oxygen-removing efficiency stability, the corrosion-resistant and scale-inhibiting functions are synchronously and synergistically improved on the basis that the oxygen-removing efficiency stability is guaranteed, and the complex working condition requirements of geothermal well recharge are completely met.

The utility model discloses an ethylene oxide absorption dealdehyding system in the field of dealdehyding, which comprises an ethylene oxide absorption tower, and the bottom of the ethylene oxide absorption tower is connected with a desalting delivery pump, a 20% sodium hydroxide solution metering pump and a dealdehyding buffer tank through pipelines. The dealdehyding buffer tank is further connected with a sodium hydrogen sulfite solution metering pump and a quenching stripping tower through pipelines, the top of the dealdehyding buffer tank is provided with a first EO re-absorption tower connecting pipe, the desalting delivery pump is connected with a cooler through a pipeline, the cooler is connected with an ethylene oxide absorption tower through a pipeline, and the ethylene oxide absorption tower is connected with a second EO re-absorption tower through a pipeline. And desalted water equipment is mounted on a pipeline between the cooler and the ethylene oxide absorption tower through a three-way valve. The dealdehyding resin is adopted for dealdehyding of the lean absorption water part, sodium sulfite is added to the quenching section of the EO absorption tower for dealdehyding, and then flash evaporation is performed, so that the content of aldehyde in the lean absorption water can be effectively reduced, and the content of aldehyde in an EO absorption system can be effectively reduced.

The invention relates to a method for efficiently and selectively extracting vanadium from vanadium shale. According to the technical scheme, the method comprises the steps that vanadium shale is crushed and ground, vanadium shale mineral powder is obtained, a sulfuric acid solution I and the vanadium shale mineral powder are mixed, mixed ore pulp is obtained, a leaching aid is added for pulp mixing, stirring and solid-liquid separation are conducted, and vanadium-containing leaching liquid and leaching residues are obtained; adding sodium sulfite into the vanadium-containing leaching solution, heating and stirring to obtain a reduced solution; adjusting the pH value of the reduced solution, and carrying out solid-liquid separation to obtain an extraction stock solution and neutralization slag; mixing the extraction organic phase and the extraction stock solution, performing countercurrent positive extraction, mixing the obtained loaded organic phase and a stripping agent, and performing countercurrent reverse extraction to obtain a vanadium-rich solution; adding sodium chlorate into the vanadium-rich solution, heating and stirring to obtain an oxidized solution, adjusting the pH value of the oxidized solution, and carrying out hydrothermal reaction and solid-liquid separation to obtain a vanadium precipitation mother solution and a vanadium precipitation intermediate product; and roasting the vanadium precipitation intermediate product to obtain vanadium pentoxide. The method is high in vanadium leaching rate, low in concentration of impurity iron in the extraction solution, short in extraction stage and high in product purity.

The invention provides a preparation method of an edaravone and dextroborneol injection, the injection comprises edaravone, dextroborneol, propylene glycol and sodium pyrosulfite, in the preparation process, the propylene glycol accounting for 60%-85% of the prescription dosage and water accounting for 5%-25% of the prescription dosage are injected into a liquid preparation tank according to the volume ratio, the mixture is heated to 50-60 DEG C, edaravone is added and stirred to be dissolved, and the edaravone and dextroborneol injection is prepared. The preparation method comprises the following steps: dissolving propylene glycol in the remaining prescription dosage, adding dextroborneol which is dissolved by propylene glycol in the remaining prescription dosage in advance, uniformly stirring, adding water which is close to a constant volume, cooling to 25 DEG C or below, adding sodium pyrosulfite, adjusting the pH value to 4.0-5.0, and fixing the volume to a full volume. According to the preparation method of the edaravone dextroborneol injection, auxiliary materials in a specific proportion are matched with the preparation steps, the problem that raw material medicines are extremely easy to separate out in the preparation process is solved, the requirement of the preparation process for an industrial liquid preparation tank is low, industrial operation is convenient, and the preparation cost is low.

The present invention belongs to the technical field of fabric color fixing agents and provides a novel acidic color fixing agent free of bisphenol S and a preparation method thereof; the acidic color fixing agent is composed of the following components in parts by weight: 15-25 parts of water, 10-15 parts of phenol, 15-25 parts of dimethylacetamide, 2-5 parts of sodium sulfite, 10-15 parts of acetic acid, 5-7 parts of concentrated sulfuric acid, 15-20 parts of acrylic acid, 2-5 parts of ethylene glycol dimethyl ether, and 1-3 parts of sorbitol; the preparation method comprises the following steps: mixing a formula amount of phenol, dimethylacetamide, acrylic acid, acetic acid, and sodium sulfite, heating, adding concentrated sulfuric acid to react, cooling, adding a formula amount of water, and adding a formula amount of ethylene glycol dimethyl ether and sorbitol to obtain the product. Compared with the prior art, the present invention does not contain bisphenol S, has a good color fixing effect, can effectively improve various fastnesses such as water fastness, perspiration fastness, and seawater resistance, has little effect on the color change of the fabric after treatment, and has good tolerance to hardness ions.

Described herein is anhydrous sodium thiosulfate, methods for synthesizing anhydrous sodium thiosulfate, pharmaceutical compositions thereof, and methods of treating ototoxicity. Anhydrous sodium thiosulfate is synthesized from sodium sulfite, sulfur, and cetylpyridinium chloride. The anhydrous sodium thiosulfate is formulated into a pharmaceutical composition comprising a buffer and solvent. These compositions are useful for eliminating or reducing ototoxicity in pediatric patients receiving platinum-based chemotherapeutics.

The invention discloses a preparation method of jade sugarcane juice, and relates to the technical field of food processing, the method comprises the following steps: S1, juicing and ozone sterilization; s2, adding a green color fixative for color protection treatment; s3, adding a clarifying agent; s4, performing non-thermal sterilization treatment; and S5, packaging and storing. The green color fixative is prepared from the following raw materials in percentage by weight: 10 to 20 percent of organic acid, 1 to 3 percent of green tea extract, 0.5 to 1 percent of apple polyphenol, 0.3 to 1 percent of sodium sulfite and the balance of water. The method can effectively sterilize and maintain the quality of the sugarcane juice, ensures that the original color, texture and flavor are not lost in long-time storage, and the prepared sugarcane juice is clear and bright in jade.

The invention discloses a polyfunctional group synergistic reverse osmosis membrane and a preparation method thereof, and relates to the technical field of new materials and membrane separation. The polysulfone porous base membrane is sequentially soaked in a water phase monomer solution and an oil phase monomer solution, the polyamide reverse osmosis membrane is prepared through interfacial polymerization, sulfonic acid groups are introduced in the process, and water transfer channels are increased; soaking in an aminobenzene sulfonic acid aqueous solution, and introducing a benzenesulfonic acid group to improve the hydrophilicity of the reverse osmosis membrane; then treating with a sodium nitrite aqueous solution, and carrying out diazotization coupling reaction on the surface, so as to improve the crosslinking degree of the polyamide separation functional layer. The reverse osmosis membrane is cleaned by using a sodium sulfite aqueous solution, and an unreacted diazo group is replaced by a sulfurous acid group, so that the surface stability of the reverse osmosis membrane is improved. The preparation method provided by the invention is easy to control and simple in process, and the reverse osmosis membrane obtained by the preparation method has a synergistic effect of polyfunctional groups, so that the desalination rate and the water permeation flux of the reverse osmosis membrane are both improved, and the reverse osmosis membrane can be applied to the fields of purified water preparation, industrial sewage and wastewater deep treatment, seawater desalination and the like.

The invention discloses preparation and application of a pH-responsive slow-release hydration heat inhibitor, and belongs to the technical field of concrete admixtures. The inhibitor is slowly released in a cement paste alkaline environment, cement hydration is continuously slowed down, and the temperature cracking risk of concrete caused by hydration heat is reduced. The core component is a pH sustained release microsphere, and the pH sustained release microsphere is composed of octadecyl acrylate, Span 80, Tween 60, white oil, acrylic acid, allyl polyoxyethylene ether 500, N, N-methylene bisacrylamide, deionized water, tert-butyl hydroperoxide, sodium pyrosulfite and the like. The preparation method comprises the steps of mixing an oil phase and a water phase, emulsifying, reacting and the like. The inhibitor further comprises sorbitol and methanol, and is prepared through the steps of stirring, filtering, drying and the like. The inhibitor can effectively reduce the hydration heat of cement, delay the setting time and improve the compressive strength of concrete.

The invention relates to a method for recycling lead by treating lead plaster of a waste lead-acid storage battery, and belongs to the technical field of lead secondary resource recycling. The method comprises the following steps: (1) slurrying lead paste with water to obtain slurry; adding sodium carbonate and sodium sulfite into the slurry, heating and then carrying out reduction-conversion reaction under a certain temperature condition to obtain a reaction mixture containing a lead-containing solid and a liquid phase; (2) carrying out solid-liquid separation on the reaction mixture obtained in the step (1) under the condition that the temperature is not lower than 40 DEG C to obtain a lead-containing solid; (3) drying the lead-containing solid obtained in the step (2) to obtain a dried lead-containing material; and (4) the dried lead-containing material obtained in the step (3) is subjected to high-temperature reduction smelting, and metal lead is obtained. According to the method, a wet process and a pyrogenic process are adopted, the used raw materials such as sodium carbonate, sodium sulfite and pea coal are cheap and easy to obtain, the whole technological process is short, operation is easy, the lead recovery rate is high, and industrial large-scale application and popularization are facilitated.

The invention belongs to the technical field of biological organic fertilizers, and provides a multifunctional biological organic fertilizer based on agricultural and forestry wastes and a preparation method thereof. The preparation method comprises the following steps: combining chitosan oligosaccharide molecules with sepiolite, and combining a composite bacterial liquid with a chitosan oligosaccharide-sepiolite composite matrix to obtain a chitosan oligosaccharide-sepiolite-composite probiotic carrier; sodium sulfite and epichlorohydrin are utilized to enable the modified lignin to have higher solubility, and the modified lignin is combined with the nano montmorillonite to form a stable network through glutaraldehyde; converting the carbon-rich biomass into biochar, and combining starch, soybean protein and a mixed trace element solution to obtain a composite synergist; lignocellulose of agricultural and forestry wastes is subjected to structural damage, and cellulose and hemicellulose are degraded and a carbon source is provided for subsequent functional microorganisms under the synergistic effect of a compound enzyme solution; in the composting fermentation process, deep degradation of organic matters is achieved, a sodium alginate solution is sprayed to form a stable nutrient slow-release network, and meanwhile the water retention capacity of the particles is improved.

The invention provides a composition for preservation of vitamin D and vitamin K, an alternative matrix and application, and relates to the technical field of detection reagents. The composition comprises 0.5-3 mol / L of sodium pyrosulfite, 0.5-3 mol / L of sodium hydrogen sulfite and 0.5-3 wt% of lipoprotein lipase, and the technical problems that vitamin D and vitamin K are unstable and prone to failure are solved.

The invention discloses a method for enriching valuable elements by collaborative smelting of magnesium slag and desulfurized gold concentrate, which comprises the following steps: uniformly mixing desulfurized gold concentrate, magnesium slag and solvent powder, granulating and drying to obtain mixed granules; the mixed granules are added into a reduction furnace, a reducing agent is added for reduction smelting, and slag and precious iron alloy are obtained; the method comprises the following steps: crushing the precious iron alloy, and leaching to obtain leaching residues and a leaching solution 1; acid is added into the leaching residues for gold dissolving, leaching liquid 2 is obtained, then sodium sulfite is added into the leaching liquid 2, and gold powder is obtained; adding hydrochloric acid into the leachate 1 to obtain a silver chloride solid and a leachate 3; and heating and pressurizing the leachate 3, and adjusting the pH value to obtain the hematite-form precipitate. According to the method, calcium oxide, silicon oxide and magnesium oxide in the magnesium slag serve as slag formers for reduction smelting of the desulfurized gold concentrate in the high-temperature process, iron alloy is obtained through synergistic reduction smelting, meanwhile, valuable elements such as gold, silver and copper in raw materials are captured, the gold recovery rate is increased to 98% or above under the cyanidation-free condition, the silver recovery rate is increased to 95%, and the iron recovery rate reaches 92%.

The invention relates to the technical field of high-molecular polymer synthesis, and particularly discloses a cracking method of high-alkalinity polysulfide rubber latex, which comprises the following steps: S1, carrying out mother liquor separation on polysulfide rubber latex, and then washing for 0-2 times to obtain the high-alkalinity polysulfide rubber latex; and S2, cracking the high-alkalinity polysulfide rubber latex into liquid polysulfide rubber by using a cracking agent composed of sodium sulfite, sodium hydrogen sulfite and sodium hydrosulfide, wherein the molecular weight of the liquid polysulfide rubber is 1000-5000. Compared with the prior art, the cracking agent composed of sodium sulfite, sodium hydrogen sulfite and sodium hydrosulfide is adopted, high-alkalinity polysulfide rubber latex can be cracked, the washing frequency is reduced, the process efficiency is improved, and the overall polysulfide rubber production efficiency is indirectly improved; meanwhile, the wastewater discharge amount is reduced, and the subsequent wastewater treatment cost is reduced. The raw materials required by the cracking agent are easy to obtain and low in cost.

The application provides a method for synthesizing an eplerenone intermediate N-1 by one-pot method, and belongs to the technical field of organic synthesis. The method is characterized in that: the eplerenone intermediate N-4 is dissolved in dichloromethane, a potassium carbonate aqueous solution and dibromohydantoin are added to perform an opening ring reaction; after the reaction is completed, hydrochloric acid is directly added to perform a rearrangement reaction; then water is separated and methanol is added in the organic layer to perform an ozonation reaction; then sodium sulfite is added to perform a reduction reaction; then hydrochloric acid is added to perform a methyl esterification reaction, so as to obtain the eplerenone intermediate N-1 crude product, and finally the eplerenone intermediate N-1 fine product is obtained through refining. The method realizes the one-pot synthesis of the eplerenone intermediate N-1 from the eplerenone intermediate N-4 through the continuous reactions of opening ring, rearrangement, ozonation, reduction and methyl esterification, and can avoid column chromatography purification, so that the method becomes a green chemical process route with greatly reduced organic solvent consumption and wastewater.