928 results about "Hydroxylamine" patented technology

The invention provides a low-cost flow battery and an application thereof, a redox active substance of a positive electrode electrolyte of the low-cost flow battery contains a hydroxylamine cyclic structure group with hindered amine, and the hydroxylamine cyclic structure group with hindered amine is preferably selected from 1-hydroxy-2, 2, 6, 7, 8-tetramethyl-1, 3, 5-tetramethyl-1, 3, 5-tetramethyl-1, 3, 5-tetramethyl-1, 3, 5-tetramethyl-1, 3, 5-tetramethyl-1, 3, 5-tetramethyl-1, 3, 5-tetramethyl-1, one or more of a 1-oxo-2, 2, 6, 6-tetrasubstituted piperidine group, a 1-oxo-2, 2, 6, 6-tetrasubstituted piperidine group, a 1-oxo-2, 2, 6, 6-tetrasubstituted piperidine group, and a 1-oxo-2, 2, 6, 6-tetrasubstituted piperidinium group; a redox active substance of the negative electrode electrolyte contains one or more of a titanium element, a vanadium element, a chromium element, an iron element and a zinc element. The low-cost flow battery has the advantages of high output voltage, high energy density, environment friendliness and low cost, and has good application prospects and large-scale popularization potential in the field of energy storage.

The invention belongs to the technical field of preparation of blocking removers, and particularly relates to a composite chelating blocking remover for an oil field and a preparation method of the composite chelating blocking remover. The composite chelating blocking remover for the oil field is prepared from the following raw materials in percentage by mass: 7 to 9 percent of 1-butyl-3-methylimidazole dodecyl sulfonate, 5 to 7 percent of erucamide propyl hydroxypropyl sulfobetaine, 3 to 4 percent of di-(2-ethylhexyl) sodium sulfosuccinate, 4 to 5 percent of ethylenediamine di-o-hydroxyphenylacetic acid, 5 to 7 percent of N, N '-di (2-hydroxybenzyl) ethylenediamine-N, N'-bis (2-hydroxybenzyl)-N, N '-bis (2-ethylhexyl)-N, N'-bis (2-hydroxybenzyl)-N, N '-bis (2-hydroxybenzyl)-N, N'-bis (2-hydroxyphenyl)-N, N '-bis (2-hydroxyphenyl)-N, N'-bis (2-hydroxyphenyl)-N The cleaning agent is prepared from the following components in percentage by weight: 3 to 4 percent of N, N '-diacetic acid, 2 to 3 percent of O-(3-(benzyloxy) propyl) hydroxylamine, 1 to 2 percent of heptadecenyl hydroxyethyl imidazoline quaternary ammonium salt, 1 to 1.5 percent of dimethyl diallyl ammonium chloride homopolymer and the balance of water. The composite chelating blocking remover for the oil field has excellent scale dissolution rate and paraffin inhibition rate when being applied to complex scale blocking removal of the oil field.

The invention relates to the field of caprolactam production, and discloses a green and efficient production process and device. The process comprises the following steps: continuously oximating cyclohexanone and hydroxylamine in a microreactor under the catalysis of mesoporous silica solid acid; carrying out gas phase rearrangement on cyclohexanone-oxime in the presence of a ZSM-5 molecular sieve under the assistance of microwaves; coupling, rectifying and purifying the crude product through a four-stage molecular sieve membrane; and performing catalytic cracking on the by-product to obtain N2 / H2O and recycling. The device comprises a micro-reaction unit, a microwave-radial reactor, a membrane coupling rectifying tower group and a tail gas cracking unit. Zero emission of ammonium sulfate is achieved, the product purity is larger than or equal to 99.95%, and energy consumption is reduced by 45%.

The invention discloses a preparation method of an ultra-pure hydroxylamine aqueous solution, and relates to the field of organic chemistry and chemical industry production. The method comprises the following steps: reacting electronic-grade hydroxylamine salt with organic alkali in a proper solvent to generate hydroxylamine, then separating and removing salt and unreacted hydroxylamine in a reaction solution through a mercaptopyridine ion exchange modified membrane, and finally concentrating the solution into 50wt% ultra-high-purity hydroxylamine aqueous solution by adopting reduced pressure evaporation or multi-effect evaporation. The process has the characteristics of high efficiency, environmental protection, simplicity and easiness in operation, effectively improves the purity, yield and separation efficiency of hydroxylamine, and meets the strict requirements of electronic grade hydroxylamine on purity and metal ion content.

The invention provides a photoacid generator, a preparation method thereof and a photoresist based on the photoacid generator. The photoacid generator is 4-alkyl-N-hydroxyl naphthalimide fluoroalkyl sulfonate, and the molecular structural formula of the photoacid generator is # imgabs 0 #, and in the formula, R is alkyl. The preparation method of the photoacid generator comprises the following steps: S1, dissolving 5-alkyl acenaphthene in a first solvent, heating, adding potassium permanganate in the heating process, then heating to reflux for reaction, and after the reaction is finished, purifying to obtain 4-alkyl-1, 8-naphthalic anhydride; s2, dissolving the 4-alkyl-1, 8-naphthalic anhydride, hydroxylamine hydrochloride and a first inorganic base in a second solvent for reaction, and after the reaction is finished, purifying to obtain 4-alkyl-N-hydroxy-1, 8-naphthalic imide; and S3, adding the 4-alkyl-N-hydroxy-1, 8-naphthalimide and an organic alkali into a third solvent, dropwise adding fluoroalkyl sulfonic anhydride, heating to react after dropwise adding is completed, and purifying after the reaction is completed to obtain the 4-alkyl-N-hydroxy-1, 8-naphthalimide. The photoresist based on the photoacid generator provided by the invention is large in ADR, and the negative photoresist development defect and the standing wave are improved.

The invention belongs to the technical field of electrode materials and nuclide recovery, and discloses a W18O49 / graphene / phosphorylation / amidoximation electrode material and preparation and application thereof. The preparation method comprises the following steps: dispersing ammonium tungstate and graphene in a trihydroxymethyl aminomethane solution, and heating and stirring for reaction to obtain a mixed solution; then adding dopamine hydrochloride, ethanol and ammonia water, stirring and reacting, and washing and drying a product to obtain a precursor; and carbonizing the obtained precursor in an inert atmosphere at the temperature of 600-900 DEG C to obtain a W18O49 / graphene material, then dispersing the W18O49 / graphene material in a hydroxylamine hydrochloride solution and / or a phytic acid solution for stirring reaction, and washing and drying the product to obtain the W18O49 / graphene / phosphorylation / amidoximation electrode material. The selective recovery efficiency of the obtained electrode material on uranyl ions can reach 95% or above, and the electrode material has wide application prospects in the field of nuclide uranium recovery.

The present application relates to the technical field of fine chemical synthesis, and in particular to an efficient preparation process of octanoyl hydroxamic acid, which comprises the following preparation steps: S1, preparation of ethyl n-octanoate: 90-110 parts by weight of n-octanoic acid and 35-40 parts by weight of ethanol are mixed, and then a solid acid catalyst is added, and the mixture is heated to reflux for reaction for 2.5-3 hours, filtered to obtain a precipitate and a filtrate, and the filtrate is decompressed and distilled to obtain ethyl n-octanoate; S2, preparation of octanoyl hydroxamic acid: 0.4-0.6 parts by weight of sodium acetate and 0.2-0.4 parts by weight of sodium carbonate are added to water, stirred until dissolved, ethanol is added, and after stirring, 24-32 parts by weight of hydroxylamine and ethyl n-octanoate prepared in S1 are added to react to obtain octanoyl hydroxamic acid; the process has the advantage of improving the reusability of the solid acid catalyst.

The invention discloses a preparation method of a high-purity ultra-clean hydroxylamine aqueous solution. A four-stage purification process comprises the following steps: 1) low-temperature chelation-ceramic membrane metal removal; 2) molecular sieve membrane rectification decomposition prevention; 3) pulse electrodialysis reversal deep desalination; and 4) gradient filtration terminal refining. According to the preparation method of the high-purity ultra-clean hydroxylamine aqueous solution, a low-temperature molecular sieve membrane rectification technology is adopted, hydroxylamine liquid-phase thermal decomposition is avoided through a vapor phase separation mechanism, and the decomposition rate is reduced to 1t from 15% of a traditional process; the method comprises the following steps of: removing metal through chelation-electrodialysis synergistically, ensuring that Fe and Cu ion residues are less than or equal to 0.05 ppb through a thiosemicarbazide-bipolar membrane system, ensuring the nitrogen environment in the whole process, ensuring that the dissolved oxygen is less than or equal to 5ppb, replacing liquid phase distillation with molecular sieve membrane vapor phase separation, solving hydroxylamine liquid phase thermal decomposition, and breaking through the trace metal removal limit by combining thiosemicarbazide-bipolar membrane synergistically removing impurities. And then through nanoscale terminal filtration, the metal / particle control reaches ppb-level limit which is superior to the SEMI standard, and double spanning of quality and cost is realized.

The invention relates to a preparation method of 2-(2-amino-5-bromo-benzoyl) pyridine, which comprises the following steps: (1) dissolving 2-amino-5-bromobenzoic acid in an organic solvent A, adding dimethyl hydroxylamine hydrochloride, a condensing agent and organic alkali, and carrying out condensation reaction to obtain 2-amino-5-bromo-N-methoxy-N-methyl benzamide; and (2) in an organic solvent B, enabling 2-bromopyridine to react with the 2-amino-5-bromo-N-methoxy-N-methyl benzamide in the step (1) under the action of an organic strong base, so as to obtain the 2-(2-amino-5-bromo-benzoyl) pyridine. The preparation method provided by the invention has the advantages of easily available synthesis raw materials, low cost, simple synthesis route, safe and controllable synthesis process and simple post-treatment method, has no amplification effect, and is suitable for industrial large-scale production.

The invention relates to the field of phosphorus-nitrogen flame retardants, and discloses a preparation method and application of a novel phosphorus-containing nitrogen oxide flame retardant, the preparation method comprises the following steps: S1, under the protection of nitrogen, dissolving diphenylphosphinyl hydroxylamine and triethylamine in a tetrahydrofuran solvent to prepare a reaction substrate solution; s2, slowly dropwise adding a diphenylphosphinyl chloride solution into the solution, and then sufficiently carrying out the reaction in a staged heating and heating reflux mode; s3, cooling and filtering to remove solid byproducts generated by reaction, and concentrating filtrate to obtain a crude product solid; and S4, recrystallizing and purifying the crude product by using ethyl acetate, and finally heating and drying the obtained crystal under a vacuum condition to obtain the product. An N-O group is innovatively introduced into the molecular structure of the flame retardant, so that the effect of efficiently capturing gas-phase free radicals in cooperation with a phosphorus-containing group is achieved, and the substantive technical progress that the material can be endowed with excellent flame retardant property with extremely low addition amount is realized.

The invention belongs to the field of concrete admixtures and relates to a concrete foaming agent as well as a preparation method and application thereof. The concrete foaming agent contains a foaming component, a reinforcing agent, a conditioning agent, water and an optional foam stabilizer, wherein the foaming component is organic amine modified sulfonated alkyl glycoside; the organic amine modified sulfonated alkyl glycoside is prepared according to the following method: carrying out hydroxyamination reaction on polyether alkyl glycoside and organic amine, carrying out sulfonation reaction on the obtained hydroxyamination reaction product, and filtering, washing and drying the obtained crude product to obtain the organic amine modified sulfonated alkyl glycoside. The key point of the invention is that the organic amine modified sulfonated alkyl glycoside is introduced into the concrete foaming agent as a foaming component, and the organic amine modified sulfonated alkyl glycoside can enhance the temperature resistance of the concrete foaming agent and endow the concrete foaming agent with good weather resistance, so that the concrete foaming agent still has good foaming and foam stabilizing properties under a relatively high temperature condition.

The invention belongs to the technical field of medicine synthesis, and particularly relates to a preparation method of metaraminol bitartrate. The preparation method comprises the following steps: reacting benzyloxycarbonyl-L-alanine serving as a raw material with dimethylhydroxylamine hydrochloride, then reacting with 3-benzyloxybromobenzene, then carrying out one-step hydrogenation reaction to obtain m-hydroxylamine, and finally salifying to obtain the metaraminol bitartrate. The method adopts a one-step hydrogenation method to simultaneously realize dual effects of reduction and deprotection, reduces operation steps and material consumption, saves material cost, and reduces generation of reaction wastes; in the preparation process, reaction conditions are mild, safety and reliability are achieved, operation is easy, and the obtained target product is high in yield, good in selectivity and suitable for large-scale production.

The present invention belongs to the technical field of chemical separation and purification, and specifically relates to a method for removing impurities from a hydroxylamine aqueous solution. The method for removing impurities from a hydroxylamine aqueous solution provided by the present invention comprises the following steps: mixing a hydroxylamine aqueous solution and an alkaline compound for sedimentation and then performing solid-liquid separation to obtain a liquid phase; the alkaline compound comprises barium hydroxide or calcium hydroxide; the liquid phase is passed through an ion exchange column for ion exchange to obtain a purified hydroxylamine aqueous solution; the resin in the ion exchange column is a resin containing phenolic hydroxyl groups. The phenolic hydroxyl-containing resin used in the present invention is easy to obtain, has a wide range of sources, and has low cost. The present invention first uses an alkaline solution to remove sulfate or phosphate in a hydroxylamine aqueous solution, and then uses a phenolic hydroxyl-containing resin to efficiently, quickly, and conveniently remove metal ions in the hydroxylamine aqueous solution without reacting with hydroxylamine. The impurity removal method provided by the present invention has the advantages of simple operation and obvious purification effect, and has good industrial prospects.

The application discloses a method for preparing a CGRP receptor antagonistic intermediate, and belongs to the field of synthesis of medical intermediates. Compound 1 is used as a raw material, reacts with hydroxylamine hydrochloride in an organic solvent to generate an intermediate 2, and then reacts in the presence of a reducing agent to obtain a remikiren intermediate 3. The application is characterized in that a large steric hindrance silicon group is used as the R substituent in the compound 1, so that high stereoselectivity is ensured in the reduction reaction. The key intermediate obtained by using the method has high chiral purity, and the operation is simple, so that the industrial production of the product in the later stage can be realized.

The present invention relates to a process for the preparation of substituted 4-(N′-hydroxy-carbamimidoyl)benzoic acids, which can be obtained by nitrilase catalyzed hydration of substituted terephthalonitriles of formula (II) in an aqueous medium to afford (ammonium) 4-cyanobenzoic acids (IIa). The hydration is followed by treatment of the aqueous reaction medium with hydroxylamine or a salt thereof to afford amidoximes (I).

The invention discloses a two-phase absorbent for capturing CO2, which is characterized by being prepared from the following components in percentage by mass: 25%-30% of N-(2-ethoxyl) ethylenediamine, 0%-3% of N-aminoethyl piperazine, 0%-3% of 2-(1-ethoxyl) pyridine, 10%-13% of N, N '-diethyl ethylenediamine, 15%-20% of N, N'-diethylethylenediamine, 5%-10% of N, N '-diethylethylenediamine, 5%-10% of N, N'-diethylethylenediamine and the balance of water. The invention relates to a cleaning agent which is prepared from the following components in percentage by weight: 1 to 5 percent of N, N-diethylhydroxylamine, 1 to 5 percent of pentamethyldiethylenetriamine, 0 to 2 percent of tert-butylamine ethoxyethanol, 0 to 3 percent of 2-amino-2-methyl-propyl alcohol, 5 to 8 percent of sulfolane, 5 to 8 percent of dimethyl ether, 5 to 8 percent of p-xylene and 5 to 8 percent of n-butyl alcohol. The composition can be prepared by uniformly stirring the components. The preparation method is simple, and the prepared two-phase absorbent can improve the saturated absorption capacity, improve the desorption rate and optimize the performance of the phase change absorbent.

The invention discloses a flame-retardant polyurethane composite material and a preparation process thereof, and relates to the field of high polymer materials. When the flame-retardant polyurethane composite material is prepared, tetramethyl tetravinyl cyclotetrasiloxane reacts with DOPO (9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide) to obtain phosphorus modified cyclotetrasiloxane; then, lignin sequentially reacts with 3-aminopropyldimethoxymethylsilane and phosphorus modified cyclotetrasiloxane, and modified lignin microspheres are obtained; the preparation method comprises the following steps: reacting 2, 4-pentanedione, 1, 5-dichloro and hydroxylamine hydrochloride to obtain a dioxime monomer; and uniformly mixing isophorone diisocyanate, 1, 4-butanediol, a dioxime monomer, N, N-dimethyl hexylamine, the modified lignin microspheres and deionized water, pouring into a mold, and curing to obtain the flame-retardant polyurethane composite material. The flame-retardant polyurethane composite material prepared by the preparation method disclosed by the invention has excellent antibacterial property, flame retardance and self-repairing property.

The invention relates to the technical field of catalysis, in particular to a Ru / WO3-x heterojunction catalyst, the chemical formula of the catalyst is Ru / WO3-x, and x represents oxygen vacancy; ru is loaded on the surface of a WO3-x support in the form of a metal simple substance, and the preparation method comprises the following steps: by taking tungstate as a tungsten source, ammonium sulfate as a morphology adjuvant and ruthenium trichloride as a ruthenium source, adjusting the pH value to 0-2, adding deionized water to prepare a hydrothermal reaction solution, performing hydrothermal reaction with a current collector, washing with deionized water, and drying, thereby obtaining the WO3-x support. And calcining in a reducing gas atmosphere to obtain the Ru / WO3-x heterojunction catalyst integrated electrode. Under the same test condition, nitrate can be effectively inhibited from being excessively hydrogenated into the final product ammonia, so that the product stays in the intermediate hydroxylamine.

The invention discloses a modified polyacrylonitrile fiber as well as a preparation method and application thereof. The preparation method of the modified polyacrylonitrile fiber comprises the following steps: 1) bundling and fixing one end of the polyacrylonitrile fiber around a heavy object to form a polyacrylonitrile fiber counterweight body; 2) immersing the polyacrylonitrile fiber counterweight body in a hydroxylamine solution to form a reaction mixture; wherein a solvent of the hydroxylamine solution is a mixed solution of C1-C5 alkyl alcohol and water; the pH value of the hydroxylamine solution is 6.5 to 7.5; and 3) heating the reaction mixture to 50-80 DEG C, and reacting at 50-80 DEG C for 2-12 hours to obtain the modified polyacrylonitrile fiber. According to the method, the modification proportion of the polyacrylonitrile fiber is increased, and the modification reaction time of the polyacrylonitrile fiber is shortened.

The invention relates to the field of drug-resistant bacterium infection, and discloses a g-C3N4 / Bi2Se3 nano heterojunction and a preparation method thereof.The preparation method comprises the steps that firstly, melamine powder is heated and calcined at the constant temperature, after a tubular furnace is naturally cooled, spark plasma sintering is conducted, nitrogen vacancies are introduced at the same time, and a blocky high-defect g-C3N4 material is obtained; grinding into powder, adding deionized water for ultrasonic treatment to obtain a first suspension, performing centrifugal treatment, freeze-drying the supernatant, and adding into an ethylene glycol solvent to obtain a second suspension; eG, polyvinylpyrrolidone, Bi (NO3) 3.5 H2O and Na2SeO3 are mixed and stirred, and the second turbid liquid is added; the preparation method comprises the following steps: adding Bi2Se3 into a reaction kettle, heating while stirring, adding a hydroxylamine EG solution, cooling to room temperature after reaction, centrifuging, washing, and carrying out vacuum drying on a precipitate to obtain a g-C3N4 / Bi2Se3 nano heterojunction; the problems that in the prior art, the catalytic efficiency is low, a collaborative mechanism does not achieve structure-function integrated design, the performance of a key functional material is limited, and the structural stability and biological suitability of the material are insufficient are solved.

A low molecular weight polymeric dispersant composition is described. The polymeric dispersant is represented by the generalized structure: (I) where A is liquid hydrocarbon polymer, B is alkyl imide or alkyl amide, C is polyamine, alkyl amine, alkyl ether amine or alkyl hydroxyl amine, and D is 1-(arene-2-yloxy)propan-2-ol; and n is 1 to 15.

The invention relates to a corrosion-resistant polypropylene modified plastic and a preparation method thereof, and belongs to the technical field of polypropylene plastic modification. The modified plastic is prepared from isotactic polypropylene, exfoliated montmorillonite, polyvinylidene fluoride powder, anhydride grafted polypropylene, a beta-crystal nucleating agent, diethyl aluminum chloride, peroxide, hindered phenol, phosphite ester and N, N-distearoyl hydroxylamine. The preparation method comprises the steps of low-shear melting and blending, high-shear supercritical COviscosity reduction, vacuum exhaust, bidirectional orientation, infrared local crosslinking, co-extrusion cooling and the like. The obtained material is excellent in tensile strength, elongation at break, low-temperature impact strength, strong acid corrosion resistance and the like.

A high molecular weight polymeric dispersant composition is described. The dispersant is represented by the generalized structure: where A is olefin copolymer, B is alkyl imide or alkyl amide, C is polyamine, alkyl amine, alkyl ether amine or alkyl hydroxyl amine, and D is 1-(arene-2-yloxy)propan-2-ol; and n is 1 to 15.

The application provides a low-cost flow battery and application thereof, and the low-cost flow battery contains a hydroxylamine cyclic structure group with a hindered amine in a redox active material of a positive electrolyte of the low-cost flow battery, the hydroxylamine cyclic structure group with the hindered amine is preferably one or more of a 1-hydroxyl-2,2,6,6-tetrasubstituted piperidine group, a 1-oxygen radical-2,2,6,6-tetrasubstituted piperidine group and a 1-oxo-2,2,6,6-tetrasubstituted piperidinium group; and the redox active material of a negative electrolyte of the low-cost flow battery contains one or more of titanium elements, vanadium elements, chromium elements, iron elements and zinc elements. The low-cost flow battery has the advantages of high output voltage, high energy density, environmental friendliness and low cost, and has good application prospect and large-scale promotion potential in the field of energy storage.

The invention discloses a wear-resistant polyurethane material and a wear-resistant polyurethane rubber roller, and relates to the technical field of high polymer materials. When the wear-resistant polyurethane material is prepared, firstly, 4, 4 '-(10, 20-di-4-pyridyl-21H, 23H-porphin-5, 15-diyl) dibenzoic acid is reduced through a reducing agent, then is oxidized through an oxidizing agent, and finally reacts with hydroxylamine hydrochloride and triethylamine to obtain functionalized porphyrin; secondly, enabling the aramid short fibers subjected to acid etching to react with 3-chloropropyltriethoxysilane to obtain modified aramid short fibers; finally, 4, 4-diphenylmethane diisocyanate and polytetrahydrofuran ether glycol are subjected to a reaction, functionalized porphyrin and 1, 4-butanediol serve as chain extenders, then the modified aramid short fibers are added, and the wear-resistant polyurethane material is obtained through vulcanization. The wear-resistant polyurethane material prepared by the invention can be used for manufacturing a polyurethane rubber roller, and has high strength, good antibacterial property and self-repairing property.

The invention discloses a copper-based catalyst for preparing propyl alcohol by electrocatalytic reduction of carbon dioxide and application of the copper-based catalyst. The preparation method of the copper-based catalyst comprises the following steps: adding a sodium hydroxide solution into an aqueous solution of a copper compound to obtain a turbid solution; adding a hydroxylamine hydrochloride aqueous solution into the turbid solution, carrying out a reaction, and carrying out centrifugal drying to obtain Cu (OH) 2 / CuO; cu (OH) 2 / CuO is prepared into a working electrode, and then the working electrode is reduced into the Cu / Cu2O nanosheet through an electrochemical reconstruction method. The Cu / Cu2O electrocatalyst with the bicontinuous nano-domain structure is obtained by using a two-step electrochemical reconstruction method, and the Cu / Cu2O electrocatalyst is used as a cathode for electrocatalytic reduction of carbon dioxide. The hydrogen evolution reaction is inhibited in a KOH or KHCO3 aqueous solution system, so that the activity of propyl alcohol preparation is remarkably improved. Experiments show that the Faraday efficiency of propyl alcohol exceeds 12.1% under the current density of 0.84 A cm <-2 >, and the Faraday efficiency of propyl alcohol is good. According to the analysis, the Cu / Cu2O catalyst obtained through the electrochemical reconstruction method serves as the cathode, and the propyl alcohol can be prepared through the carbon dioxide electrocatalytic reduction reaction.

The invention discloses a preparation method of 3-chloro-5, 5-dimethyl-4, 5-dihydroisoxazole, which comprises the following steps: taking a hydroxylamine oxygen sulfonic acid aqueous solution and isopentenal as raw materials, carrying out oximation reaction in an organic solvent under an alkaline condition, then directly adding an acid or an organic base catalyst into the reaction system, and reacting for 2-4 hours to obtain 3-chloro-5, 5-dimethyl-4, 5-dihydroisoxazole, thereby obtaining the 3-chloro-5, 5-dimethyl-4, 5-dihydroisoxazole. Under the catalytic action of the catalyst, a cyclization reaction is carried out, after the reaction is finished, an intermediate solution containing 5, 5-dimethyl-4, 5-dihydroisoxazole is obtained, and the next step is directly carried out; and carrying out a chlorination reaction by taking the intermediate solution as a raw material and sodium hypochloride or chlorine as a chlorination reagent, and after the reaction is finished, carrying out post-treatment to obtain the 3-chloro-5, 5-dimethyl-4, 5-dihydroisoxazole. The hydroxylamine oxygen sulfonic acid is used for enabling the isopentenal to be subjected to oximation reaction under the alkaline condition, then cyclization is carried out under the catalytic action of acid or alkali, the 5, 5-dimethyl-4, 5-dihydroisoxazole is generated, and the process has the advantages that the yield is high, the production steps are simplified, and the production cost is reduced.

The utility model provides a rectifying tower device for preparing isopropyl hydroxylamine, which comprises an upper tower shell and a lower tower shell, the upper tower shell is arranged on the upper side of the lower tower shell, a connecting pipe is arranged between the upper tower shell and the lower tower shell, the outer end of the connecting pipe is integrally connected with a connecting ring, and the connecting ring is arranged between the upper tower shell and the lower tower shell. A first filler plate is fixedly connected in the connecting pipe, a second filler plate is arranged in the lower tower shell, a third filler plate is arranged in the upper tower shell, the second filler plate and the third filler plate are respectively arranged on the lower side and the upper side of the connecting pipe, and the second filler plate can move up and down along the lower tower shell; and the third filler plate can move up and down along the upper tower shell. By means of a combined assembly mode, the purpose of convenient disassembly and assembly is achieved, the packing can be disassembled and assembled conveniently, meanwhile, maintenance is convenient, and the distance and the height between the packing plates can be adjusted conveniently.

The invention relates to a treatment method of hydroxylamine-containing waste liquid. The treatment method comprises the following steps: (1) mixing a transition metal catalyst with hydroxylamine-containing waste liquid to obtain mixed liquid, and carrying out self-decomposition reaction; (2) maintaining the pH value of the mixed solution at 9.0-10.5 in the self-decomposition reaction process; and (3) after the self-decomposition reaction is finished, carrying out solid-liquid separation to obtain the hydroxylamine-removed waste liquid. The chemical environment during hydroxylamine decomposition reaction is alkaline, the condition is easy to realize, and the use amount of acid is greatly reduced. Meanwhile, the amount of added simple substances and compounds containing metal elements is small, and the amount of generated corresponding metal-containing reaction waste is small. And finally, the heat required by the reaction can be completely provided by the heat released by the decomposition of the hydroxylamine, and the self-decomposition of the hydroxylamine can be realized without additional energy.

The invention belongs to the technical field of sewage treatment, and discloses a long-acting slow-release sludge denitrification flora regulating agent as well as a preparation method and application thereof. The preparation method comprises the following steps: uniformly mixing dolomite powder, hydroxylamine-O-sulfonic acid powder and ethylhydrazine oxalate powder to obtain composite powder; mixing hydroxypropyl cellulose with an ethanol water solution to obtain mucilage; and mixing the composite powder and mucilage, and preparing the long-acting slow-release sludge denitrification flora adjusting agent through a granulation technology. The agent disclosed by the invention is applied to the nitrogenous wastewater treatment process, and the flora structure can be quickly adjusted to realize the start-up and performance optimization of a sewage denitrification process based on nitrite.