43 results about "Hydroxylamine sulfate" patented technology

The invention discloses a reversible background-free hydrogel nanosensor for acetone detection and an intelligent sensing platform, and relates to the technical field of biosensors. The hydrogel nanosensor consists of a hydrogel matrix and an upconversion nanoprobe, and the upconversion nanoprobe comprises upconversion nanoparticles (UCNPs), hydroxylamine sulfate and thymol blue (TB). The invention adopts hydroxylamine sulfate as a specific recognition unit of acetone to construct a reversible luminescent hydrogel probe for acetone detection, and the probe can be reused in multiple detections, thereby reducing the cost of a single detection. In addition, by adopting near-infrared light as an excitation light source, the autofluorescence interference of the hydrogel matrix is ​​effectively avoided, thereby improving the detection accuracy.

The invention discloses a hydroxylamine sulfate preparation method, which comprises: S1, carrying out analysis on caprolactam sulfate with water or a hydroxylamine sulfate aqueous solution to obtain a caprolactam sulfuric acid aqueous solution; extracting and separating the caprolactam sulfuric acid aqueous solution by using an extracting agent, conveying an extraction phase caprolactam organic solution to a caprolactam device for treatment, and entering a step S2 into a raffinate phase sulfuric acid aqueous solution or hydroxylamine sulfate and sulfuric acid aqueous solution; s2, adding ketoxime and a sulfuric acid aqueous solution or hydroxylamine sulfate and the sulfuric acid aqueous solution to generate a hydrolysis reaction to generate a hydroxylamine sulfate aqueous solution and ketone, and after ketone separation, sending the ketoxime to a ketoxime preparation device; s3, carrying out steam stripping separation on the hydroxylamine sulfate aqueous solution, sending unreacted ketoxime to the step S2 to participate in a hydrolysis reaction, and carrying out concentration crystallization, centrifugal filtration and drying dehydration on the hydroxylamine sulfate aqueous solution to obtain hydroxylamine sulfate; and S4, returning part of hydroxylamine sulfate raffinate subjected to centrifugal filtration to the step S1 for resolving caprolactam sulfate, and carrying out oximation reaction treatment on the residual hydroxylamine sulfate raffinate and ketone.

The invention relates to a method for synthesizing trifloxystrobin through a one-pot method, and belongs to the technical field of organic synthesis.The method comprises the following steps that 1, E-2-(2-halomethylphenyl)-2-methoxyiminoacetic acid methyl ester, m-trifluoromethyl acetophenone, hydroxylamine hydrochloride or hydroxylamine sulfate and a solvent are added into a reaction flask, then alkali is added, and after addition is completed, a heat preservation reaction is conducted; and Step 2, after the reaction is finished, filtering to remove salt, and concentrating filtrate under reduced pressure to obtain trifloxystrobin. Compared with a traditional synthesis method of the trifloxystrobin, the synthesis method of the trifloxystrobin has the advantages that the 3-trifluoromethyl acetophenone and the E-2-(2-halomethylphenyl)-2-methoxyiminoacetic acid methyl ester are used as raw materials, the trifloxystrobin is directly synthesized by a one-pot method, the reaction route is short, the raw material cost is low, and the synthesis method of the trifloxystrobin by the one-pot method has the advantages that the synthesis efficiency is high, and the synthesis cost is low. The preparation method has the advantages that the preparation of m-trifluoromethyl acetophenone oxime from m-trifluoromethyl acetophenone is not needed, the whole synthesis process is simpler and more efficient, the reaction conditions are mild, and the preparation method is suitable for industrial large-scale production.

The invention provides a chemical composition for removing etching residues, which comprises organic ammonium, a corrosion inhibitor, an organic solvent, an inhibitor, hydroxylamine and deionized water, the organic ammonium is selected from one or more of choline hydroxide, tetramethylammonium hydroxide, tetraethylammonium hydroxide, tetrapropylammonium hydroxide, tetrabutyl ammonium hydroxide, tributyl methylammonium hydroxide, benzyl trimethyl ammonium hydroxide, ethyl trimethyl ammonium hydroxide, diethyl dimethyl ammonium hydroxide and tris (2-ethoxyl) methylammonium hydroxide, and the organic ammonium is selected from one or more of choline hydroxide, tetramethylammonium hydroxide, tetraethylammonium hydroxide, tetrapropylammonium hydroxide, tetrabutyl ammonium hydroxide, tributyl methylammonium hydroxide, benzyl trimethyl ammonium hydroxide, ethyl trimethyl ammonium hydroxide, diethyl dimethyl ammonium hydroxide and tris (2-ethoxyl) methylammonium hydroxide; the inhibitor is selected from one or more of fructose, galactose, lactose, maltose, glucose, ascorbic acid, hydroxylamine sulfate and ethanol hydrazine. Compared with the prior art, the chemical composition for removing the etching residues can effectively remove the residues after plasma etching, meanwhile, etching of AlCu, TiN / Ti and silicon oxide is avoided, an operation window is large, and the chemical composition has good application prospects in the semiconductor etching process.

The present invention relates to an iron ore reverse flotation inhibitor and a preparation method thereof. In the first step, a mixture of the following components by weight is reacted at 40°C to 50°C for 1 to 6 hours to obtain an auxiliary agent (1): 100 parts of corn starch, mung bean starch, or potato starch, 0.5 to 4.0 parts of sodium hydroxide or sodium ethoxide, 5 to 15 parts of methyl chloroacetate, and 5 to 15 parts of hydroxylamine hydrochloride or hydroxylamine sulfate. In the second step, a mixture of the following components by weight is reacted at 20°C to 50°C for 1 to 3 hours to obtain a finished inhibitor: 100 parts of the auxiliary agent (1) obtained in the first step and 1 to 12 parts of sodium hypochlorite. The inhibitor has strong inhibitory ability, selectivity, and low-temperature adaptability and can be used for room-temperature flotation.

A method for preparing an aqueous hydroxylamine solution belongs to the technical field of hydroxylamine preparation. Specifically, the method comprises adding an aqueous hydroxylamine sulfate solution to a raw material supply chamber, adding an aqueous sodium hydroxide solution to an alkali supply chamber, adding weakly alkaline water to a desalting chamber, adding a sulfuric acid solution to a concentrating chamber, circulating the sodium hydroxide solution between the anodic and cathodic chambers, and performing electrodialysis at room temperature to prepare the aqueous hydroxylamine solution. Furthermore, a method for preparing a stabilizer is provided, which can improve the stability of the aqueous hydroxylamine solution and reduce the damage to the hydroxylamine by metal ions.

The invention discloses a preparation method of a novel boiler deoxidant, and belongs to the technical field of chemical synthesis. The invention provides a preparation method of a novel boiler deoxidant, which comprises the following steps of: dehydrating isochromanone serving as a raw material and hydroxylamine sulfate in a solvent (water, ethanol or methanol) under an acidic condition to generate isochromanone oxime, and mixing the isochromanone oxime with other oximes, a dispersing agent and the like in parts by weight to prepare the required boiler deoxidant. The deoxidant is prepared from 3 to 5 parts of isochroman ketoxime, 12 to 16 parts of acetoxime, 12 to 14 parts of acetaldoxime, 8 to 12 parts of carbohydrazide, 4 to 7 parts of a dispersant, 5 to 10 parts of a pH regulator, 5 to 10 parts of a catalyst and 40 to 50 parts of water, wherein the other raw materials are prepared from 3 to 5 parts of isochroman ketoxime, 12 to 16 parts of acetoxime, 12 to 14 parts of acetaldoxime, 8 to 12 parts of carbohydrazide, 4 to 7 parts of a dispersant, 5 to 10 parts of a pH regulator, 5 to 10 parts of a catalyst and 40 to 50 parts of water. According to the preparation method, boiler pipelines, equipment and the like can be passivated while low toxicity, high efficiency and high speed can be guaranteed, equipment corrosion damage caused by metal oxide deposition of a boiler is prevented, and the product is non-toxic, harmless and mild to the environment.

The invention belongs to the technical field of organic synthesis, and particularly relates to a chloroamine synthesis method which comprises the following steps: S1, mixing a hydroxylamine sulfate aqueous solution and methyl acetate, and then dropwise adding a NaOH aqueous solution to react for 1-2 hours; s2, adding trans-1, 3-dichloropropene and the sulfonated niobium-doped TS-1 molecular sieve, uniformly mixing, heating to 60-70 DEG C, and carrying out etherification reaction for 5-6 hours to generate an intermediate product; s3, adding hydrochloric acid into the intermediate product, fully stirring, and carrying out reflux reaction at 60-70 DEG C for 2-3 hours; s4, organic matter is separated through reduced pressure distillation, then a NaOH aqueous solution is added to adjust the pH to be larger than 9, extraction is conducted, the extraction agent is removed through reduced pressure distillation, and chloramine is obtained. According to the synthesis method provided by the invention, the selectivity of the chloro-amine is 99% or above, the yield of the chloro-amine is 98% or above, the production efficiency of the chloro-amine can be effectively improved, and the synthesis method is suitable for industrial application.

The invention provides a synthesis method of 3-chloro-5, 5-dimethyl-4, 5-dihydroisoxazole, which comprises the following steps: mixing isovaleric acid with a catalyst, pumping the mixture and liquid chlorine into a mixer, uniformly mixing, and slowly introducing the mixture into a microchannel for reaction to obtain 2-chloroisovaleric acid; s2, uniformly mixing 2-chloroisovaleric acid in S1 with an acylation reagent, and slowly introducing the mixture into the microchannel for reaction to obtain 3, 3-dimethyl crotonyl chloride; adding hydroxylamine hydrochloride or hydroxylamine sulfate and a solvent into the 3, 3-dimethyl crotonyl chloride in the step S2 in a reaction kettle for dissolving, controlling the temperature of the system to be 0-30 DEG C while stirring, adding alkali in batches, and stirring for reaction to obtain 5, 5-dimethyl-3-isoxazolidinone; and S3, diluting the 5, 5-dimethyl-3-isoxazolidinone obtained in the step S3 and a chlorination reagent with a solvent respectively, and then pumping the diluted 5, 5-dimethyl-3-isoxazolidinone and the chlorination reagent into the microchannel reactor respectively for reaction to obtain the 3-chloro-5, 5-dimethyl-4, 5-dihydroisoxazole. In the production process, tail gas is single in component and convenient to treat, and environmental protection pressure is small; meanwhile, the used main raw materials are bulk and cheap chemicals, so that the production cost is lower.

A method for co-producing caprolactam and hydroxylamine sulfate comprises: (1) ammoximation reaction: ketone, ammonia and hydrogen peroxide are reacted at a certain temperature under the action of a titanium silicon catalyst to produce an oxime solution; (2) hydrolysis reaction: caprolactam sulfate is added with an appropriate amount of desalted water, stirred, and the hydrolysis temperature is controlled to carry out a hydrolysis reaction to obtain a hydrolysis reactant caprolactam sulfuric acid solution; (3) co-production reaction of caprolactam and hydroxylamine sulfate: oxime solution is added to step (3), and the reaction is carried out at a certain temperature and pressure to obtain caprolactam and hydroxylamine sulfate solution; (4) physical separation: the reactants in step (3) are separated into layers, the upper layer is a light phase, which is an organic solvent containing caprolactam, and the lower layer is a heavy phase, which is an aqueous phase containing hydroxylamine salt; (5) the organic solvent containing ketone is returned to step (1) for ammoximation reaction, or after the solvent is removed, it is returned to step (1) for ammoximation reaction; the lower layer is subjected to sedimentation, centrifugal separation, and drying to obtain a crude caprolactam solution and hydroxylamine sulfate salt. The invention has the advantages of simple process, combining the production of caprolactam with the production of hydroxylamine salt, reducing the by-product of ammonium sulfate, and producing caprolactam and hydroxylamine salt at the same time.

The invention discloses a color developing card capable of detecting the oxidation degree of cold-pressed or hot-pressed carya illinoensis oil, and belongs to the technical field of biology, the color developing card utilizes the principle that aldehyde components volatilized by the carya illinoensis oil react with hydroxylamine sulfate to change the pH so as to change the color of Congo red, the color of the carya illinoensis oil can be detected according to the color of the color developing card, and the degree of oxidation of the carya illinoensis oil can be detected. Whether the peroxide value level exceeds the national standard or not is judged; the color developing card takes filter paper as a substrate material, so that the cost is low; the preparation method of the color developing card is simple and effective, and is convenient for large-scale production; the color developing card is portable and easy to operate, and is beneficial to quality control of carya illinoensis oil products in the storage and transportation process; common consumers without professional detection capability or non-technicians in the field can also judge the oxidation condition of the cold-pressed or hot-pressed carya illinoensis oil through the color developing card.

The present disclosure provides methods, compounds, and compositions for treating industrial streams. A method of treating a stream may include adding a scavenger to the stream and adding an amine to the stream. The stream may include an acid gas and / or a carbonyl-containing compound. The scavenger may include, for example, sodium borohydride, hydroxylamine sulfate, acetaldehyde oxime, sodium cyanoborohydride, or any combination thereof. The amine may include, for example, ethylene diamine, ethyl ethanolamine, diethyl monoethanolamine, or any combination thereof.

The invention provides 1, 5-diaminonaphthalene and a preparation process thereof, and the 1, 5-diaminonaphthalene is prepared from the following raw materials in parts by weight: 90-100 parts of 1-nitronaphthalene, 5-15 parts of a difunctional composite catalyst, 120-180 parts of hydroxylamine sulfate, 30-60 parts of ammonia water (the concentration is 25-28%), 250-350 parts of N-methyl pyrrolidone (NMP), 50-150 parts of isopropanol, 1-3 parts of sodium pyrophosphate and 2-5 parts of sodium citrate. Wherein the bifunctional composite catalyst is a nickel-cobalt-cerium / magnesium-aluminum composite oxide. According to the invention, the synergistic effect of all the components can improve the preparation efficiency and selectivity of 1, 5-diaminonaphthalene, and meanwhile, the stability of the reaction process is optimized.

The invention discloses a preparation method of a special olfactory visual indicator card for monitoring the deterioration degree of rice, and the preparation method comprises the following steps: (1) weighing carboxymethyl cellulose, and stirring for dissolving; and (2) adding Congo red CR and hydroxylamine sulfate, stirring, and drying in an oven to obtain CMC-CR. (3) weighing chitosan, dissolving chitosan in acetic acid, stirring for 1 hour, adding glycerol, and continuously stirring for 30 minutes to obtain a chitosan solution; and (4) soaking the prepared CMC-CR in a chitosan solution, uniformly coating, and drying in an oven to obtain the CS / CMC-CR indicator card. The invention relates to the technical field of food detection. The preparation method of the special olfactory visual indicator card for monitoring the rice deterioration degree is simple and safe, can be used for large-scale production, and has the advantage of degradability. The method has significant responsiveness to the main volatile substance hexanal generated by rice deterioration, eliminates the interference of other volatile flavor substances on the responsiveness, and provides a new thought for the fields of rice packaging, intelligent detection and the like.

An electroless ruthenium plating bath contains at least a ruthenium compound, a reducing agent, and a stabilizer. The reducing agent is hydrazines. The stabilizer includes a hydroxylamine compound and an organic compound having a hydroxyl group. The hydroxylamine compound is either or both of hydroxylamine sulfate and hydroxylamine chloride. The organic compound having a hydroxyl group is at least one selected from the group consisting of gluconolactone, sorbitol, mannitol, and citric acid monohydrate.

The invention discloses a method for removing copper and extracting selenium from copper anode slime, which comprises the following steps: leaching copper and selenium: mixing the copper anode slime, an acid solution containing sulfate radicals and an oxidizing agent to obtain a pulpified material, and leaching under the ultrasonic conditions that the reaction temperature is 50-80 DEG C and the ultrasonic power is 200-800 W to obtain a copper-selenium-rich solution and copper-selenium-removed slag, the oxidizing agent is 2KHSO5. KHSO4. K2SO4, and the pH value of the oxidizing agent is 7. A selenium precipitation agent is added into the copper-selenium-rich liquid, a reduction reaction is carried out under the ultrasonic conditions that the reduction temperature is 30-75 DEG C and the ultrasonic power is 150-600 W, selenium precipitation is carried out, crude selenium and copper-selenium-rich liquid are obtained, and the selenium precipitation agent is selected from at least one of hydroxylamine sulfate, hydroxylamine and hydroxylamine hydrochloride. According to the method, copper is separated from the copper anode slime and selenium is extracted from the copper anode slime only through a two-step method, the overall process is short, reaction conditions are mild, the treatment time is short, the operation environment is good, and energy consumption is low.

The invention discloses an environment-friendly low-slag low-consumption phosphating solution and a preparation method thereof, and belongs to the technical field of metal surface anti-rust treatment solutions. The corrosion inhibitor comprises the following chemical components in percentage by mass: 8-13% of zinc oxide, 8-12% of nitric acid, 17-25% of phosphoric acid, 0.5-0.8% of citric acid, 0.3-0.5% of hydroxylamine sulfate, 0.3-0.5% of sulfamic acid and the balance of water. The method comprises the steps of preparing zinc oxide turbid liquid; preparing a zinc salt solution; and preparing a finished product phosphating solution. The method has the advantages that invalid consumption of phosphate ions can be reduced from the source; the compactness and the anti-rust performance of the zinc-series phosphating film can be guaranteed, meanwhile, a large amount of sediment brought by nitric acid serving as a strong oxidant is avoided, and the total nitrogen content can be lower than 70 mg / L; the spontaneous precipitation of free zinc ions and phosphate ions can be inhibited, and the ion balance effect of the system can be well maintained.

The application discloses a flotation collector for sulfur-oxygen mixed zinc ore, and a structural general formula of the collector is shown in the following formula: wherein R is a C1-C5 hydrocarbon group; a preparation method of the collector comprises the following steps: adding 0.1 mol of acrylonitrile and 0.1 mol of amine into a reaction bottle, stirring uniformly, slowly and dropwisely adding 0.11 mol of carbon disulfide at 0-20 DEG C, adding 20 mL of water and hydroxylamine sulfate after stirring for 1 h at normal temperature, stirring for 15 min, adding a certain amount of alkali, and synthesizing a reaction for 2-6 h at 30-70 DEG C; and the lower water layer is removed, and the upper organic layer is the sulfur-oxygen mixed zinc ore collector ZJOS-1, which can simultaneously and efficiently float and recover zinc sulfide ore and zinc oxide ore in a same tank, and has the advantages of simplifying a flotation process and reducing equipment investment.

The invention discloses a green preparation process of capryloyl hydroxamic acid, and relates to the technical field of fine chemical synthesis. The environment-friendly preparation process of the capryloyl hydroxamic acid at least comprises the following preparation steps: mixing and stirring hydroxylamine sulfate, sodium hydroxide and ethanol, dropwise adding ethyl caprylate, and carrying out oximation reaction to obtain a reaction mixed system; reducing the temperature of the reaction mixed system, dropwise adding concentrated sulfuric acid to adjust the pH value to 6-7, and performing solid-liquid separation to obtain sodium sulfate and capryloyl hydroximic acid mother liquor; and carrying out rotary evaporation on the capryloyl hydroxamic acid mother liquor to recover the ethanol, and carrying out fractional crystallization to obtain the capryloyl hydroxamic acid. The green preparation process of capryloyl hydroxamic acid provided by the invention has the advantages of high raw material utilization rate, strong solvent recycling reusability, high product molar yield, high purity, good chroma, light smell, good corrosion resistance, continuous production, no three wastes in the process, low temperature and normal pressure, safety, green and energy saving, and accords with the green chemical engineering concept of carbon neutralization.

The present disclosure provides methods, compounds, and compositions for treating industrial streams. A method of treating a stream may include adding a scavenger to the stream and adding an amine to the stream. The stream may include an acid gas and / or a carbonyl-containing compound. The scavenger may include, for example, sodium borohydride, hydroxylamine sulfate, acetaldehyde oxime, sodium cyanoborohydride, or any combination thereof. The amine may include, for example, ethylene diamine, ethyl ethanolamine, diethyl monoethanolamine, or any combination thereof.

The present invention relates to an additive concentrate useful for scavenging hydrogen sulphide and organic compounds, comprising monoethanolamine triazine and / or monomethylamine triazine and at least one salt chosen from alkali metal bisulfites, alkali metal metabisulfites and hydroxylamine sulfate. The invention also relates to a composition comprising said concentrate additive and a liquid vehicle, as well as the use of the additive concentrate or of the composition of the invention for scavenging hydrogen sulphide and / or organic compounds comprising at least one sulfhydryl group in a liquid or gaseous stream.

The present invention belongs to the field of organic synthesis technology and specifically relates to a method for synthesizing benzohydroxamic acid, comprising: 1) an oximation step: mixing methyl benzoate, hydroxylamine sulfate, a phase transfer catalyst, a defoaming agent, and water, adding a base, and conducting an oximation reaction at 25-42°C to obtain an oximation system; 2) an acidification step: adding concentrated sulfuric acid to the oximation system and conducting an acidification reaction to obtain an acidified system; and 3) a crystallization step: cooling the acidified system to 20-25°C, crystallizing, and filtering to obtain benzohydroxamic acid crystals. The benzohydroxamic acid product prepared by the present invention has a high yield and a purity of up to 99%, and can be directly used as a mineral flotation agent. Furthermore, the present invention has the advantages of stable production indicators, simple process control, and low cost. Furthermore, the use of water as a solvent makes it non-toxic and environmentally friendly.

The invention discloses a preparation method of a biogenic vein containing a venous valve, and belongs to the technical field of biomedical functions.The preparation method of the biogenic vein containing the venous valve comprises the following steps that firstly, a pig or cattle jugular vein pipeline containing a complete valve is cut, cleaned, disinfected and flushed for use; sequentially carrying out cell lysis, cell digestion and nucleic acid digestion treatment; immersing into a 1 mol / L hydroxylamine sulfate solution to carry out heparin covalent cross-linking; immersing into a treating fluid to obtain a biogenic vein containing a venous valve; wherein the treating fluid is a PBS (Phosphate Buffer Solution) containing 4wt% of hydroxyethyl starch and 0.1 wt% of polyhexamethylene biguanide. According to the preparation method of the biogenic vein containing the venous valve, provided by the invention, the treatment liquid containing 4wt% of hydroxyethyl starch and 0.1 wt% of polyhexamethylene biguanide is introduced in the preparation process, so that the technical problem of insufficient dehydration and bacteriostasis in the background technology is remarkably solved, and meanwhile, the valve functionality of the biogenic vein is remarkably improved.

The present invention relates to a method for scavenging hydrogen sulphide and / or organic compounds comprising at least one sulfhydryl group in a liquid or gaseous stream, comprising contacting said stream a composition comprising: - monoethanolamine triazine and / or monomethylamine triazine, and - at least one salt chosen from alkali metal bisulfites, alkali metal metabisulfites and hydroxylamine sulfate, wherein the weight ratio between the total amount of monoethanolamine triazine and / or monomethylamine triazine and the total amount of said salt(s) lies within the range from 1:1 to 100:1. The present invention also concerns an additive composition useful for scavenging hydrogen sulphide and organic compounds.

The application discloses a flexible wearable bifunctional colorimetric gas sensor patch as well as a preparation method and application thereof, and belongs to the field of sensors. The bifunctional colorimetric gas sensor patch uses thymol blue and hydroxylamine sulfate as response materials, and is designed as a high-sensitivity, low-cost and wide-range sensor, which can simultaneously detect acetone gas in a range of 1-40 ppm and HCl gas in a range of 100-900 ppm. The color data collected by the sensor can be converted into gas concentration by using a deep neural network, so that the precise gas concentration detection function is realized, and real-time gas leakage monitoring and early warning can be realized on a site such as a chemical working site.

The invention discloses a preparation process of oximido acetanilide, which comprises the following specific steps: (1) dissolving hydroxylamine sulfate or hydroxylamine hydrochloride in water, neutralizing with alkali, adding methyl glyoxylate, and heating for reaction to prepare 2-oximido methyl acetate; and (2) reacting 2-oximido methyl acetate with aniline under the action of a catalyst to generate oximido acetanilide. In the reaction process, high-concentration sodium sulfate is not adopted as a solution, a large amount of salt-containing wastewater is not generated, the environmental protection property is high, the yield is good, and a new method is provided for production of oximido acetanilide.

The invention discloses a joint production system of hydroxylamine sulfate and caprolactam, which is characterized in that caprolactam sulfate and water or a hydroxylamine sulfate aqueous solution enter a mixer for analysis to obtain a caprolactam sulfuric acid aqueous solution; after a caprolactam sulfuric acid aqueous solution and an extraction agent enter a first extraction tower for extraction separation, a raffinate phase sulfuric acid aqueous solution or hydroxylamine sulfate and sulfuric acid aqueous solution enters a reactive distillation tower for hydrolysis reaction to generate a hydroxylamine sulfate aqueous solution and ketone, the ketone enters a reflux tank for separation and then enters a ketoxime device for preparation of ketoxime, and the ketoxime circularly enters the reactive distillation tower; the extraction phase caprolactam organic solution is conveyed to a caprolactam device to be treated, and a caprolactam product is obtained; the hydroxylamine sulfate aqueous solution enters a stripping tower to separate out a small amount of unreacted ketoxime, the separated hydroxylamine sulfate aqueous solution is crystallized, separated and dried to obtain a hydroxylamine sulfate product, a part of separated hydroxylamine sulfate mother liquor enters a mixer to be recycled, and a part of the separated hydroxylamine sulfate mother liquor is sent to a purification device to be treated.

This application provides a method for phase analysis of manganese in ores, belonging to the field of phase analysis of ores. The method involves weighing an ore sample and sequentially leaching it with silver nitrate solution to separate the manganese sulfate phase; then leaching it with aluminum nitrate solution under heating, adding a mixed solution of isoamyl alcohol and isoamyl acetate as a first inhibitor to separate the manganese carbonate phase; followed by stepwise leaching with sulfurous acid solution and hydroxylamine sulfate-sulfuric acid solution, adding a mixed solution of n-butanol and ethyl acetate as a second inhibitor to separate the manganese oxide phase; and finally, the remaining residue is digested by ashing to obtain the silicate phase. The manganese content of each phase digest is determined by inductively coupled plasma atomic emission spectrometry (ICP-AES). This application rationally selects various possible forms of manganese in the ore and scientifically selects the leaching agent for each phase, ensuring that the leaching agent of the previous phase does not leach manganese from the subsequent phases, thus guaranteeing accurate determination of each phase.

The purpose of the present invention is to provide an electroless ruthenium plating bath in which hydrazine is used as a reducing agent, said electroless ruthenium plating bath being capable of improving bath stability, having excellent ruthenium deposition properties, and being capable of suppressing shrinkage of a coating film during annealing treatment. The electroless ruthenium plating bath at least contains a ruthenium compound, a reducing agent and a stabilizing agent, the reducing agent is hydrazine, the stabilizing agent is composed of a hydroxylamine compound and an organic compound with hydroxyl, and the hydroxylamine compound is at least one of hydroxylamine sulfate and hydroxylamine chloride; the organic compound having a hydroxyl group is at least one selected from the group consisting of gluconolactone, sorbitol, mannitol, and citric acid monohydrate.

The invention relates to the technical field of positive lead paste of lead-acid storage batteries, and particularly discloses positive lead paste of a valve-regulated sealed lead-acid storage battery and a preparation method of the positive lead paste. Functional components such as stannous sulfate, antimonous oxide, graphite, a silicon dioxide dispersion liquid and hydroxylamine sulfate are added, the weight ratio of all the components is precisely regulated and controlled, all the additive components have a synergistic effect, graphite constructs a low-resistance conductive network, nano-silicon dioxide inhibits softening of lead plaster, short fibers reinforce structural stability, and hydroxylamine sulfate reduces vulcanization of a polar plate. According to the invention, the core problems of poor low-temperature charge-discharge performance, easy falling of active substances, short cycle life and the like of the valve-regulated sealed lead-acid storage battery in a low-temperature energy storage scene are solved, and meanwhile, the valve-regulated sealed lead-acid storage battery is compatible with the existing industrial production process and has remarkable technical advantages and application value.