1743 results about "Ammonium" patented technology

The invention discloses a bionic lignin-based saline-alkali soil improvement material and a preparation method thereof, and belongs to the technical field of high polymer materials and soil improvement. According to the saline-alkali soil improving material, lignin or a derivative thereof serves as a framework, glutenin charge distribution and a dynamic disulfide bond sodium ion response function are simulated, and the sequence and the proportion of chain segments of sulfonic acid groups and quaternary ammonium salt groups are accurately regulated and controlled through step-by-step activation and alternate copolymerization in an aqueous solution polymerization reaction system; positive and negative charges form more uniform sequence distribution, so that the amphipathy of the lignin compound is realized; then, sulfydryl is introduced through click chemistry, linear regulation and control of material viscosity and water solubility are achieved through the chain transfer characteristic of multi-sulfydryl functional groups, and the requirements of different saline-alkali soil application scenes are met. The limitation that a traditional lignin product is single in function is broken through, efficient utilization of lignin is achieved, and the intelligent saline-alkali soil improvement material integrating high stability and pH and Na < + > multi-environment response is developed.

The invention discloses a wear-resistant vehicle body film and a preparation method thereof, and relates to the technical field of films. The wear-resistant automobile body film prepared by the invention is prepared from polytetrahydrofuran ether glycol, isophorone diisocyanate, a catalyst, dihydric alcohol quaternary ammonium salt, a functional aid, modified silicon dioxide and a chain extender. The dihydric alcohol quaternary ammonium salt is obtained by reacting N, N '-dihexyl-N, N'-dimethyl propane-1, 3-diamine with monochloroacetone and then condensing with glycerol; the functional additive is obtained by reacting 2-boric acid thiophene-4-methyl acetate with 2, 7-dibromofluorene and then carrying out bromination hydrolysis; the modified silicon dioxide is obtained by reacting pretreated silicon dioxide with melamine and then reacting with sodium hypophosphite. The wear-resistant vehicle body film prepared by the invention has good anti-aging, wear-resistant, antibacterial and flame-retardant properties.

The method comprises the following steps: weighing an oxide precursor of metal indium, an oxide precursor of metal M, an ammonium salt and a lithium salt according to a chemical formula of indium-based halide, fully mixing, and calcining in an inert atmosphere to obtain the indium-based halide solid electrolyte. Forming an indium-based halide solid electrolyte through a solid-phase reaction; wherein M is selected from at least one of magnesium, calcium, strontium, barium, aluminum, gallium, indium, bismuth, scandium, yttrium, zinc, germanium, tin, lanthanum, cerium, samarium, gadolinium, holmium, erbium and ytterbium. The method can greatly simplify the synthesis process, reduce the raw material cost and realize industrial batch preparation.

The invention relates to a method for preparing a nerofloxacin chiral piperidylamine intermediate, which comprises the following steps of: carrying out condensation reaction on 5-hydroxy nicotinic acid which is simple and easy to obtain and is used as a raw material and different alcohols, screening through a series of asymmetric catalytic hydrogenation conditions to obtain optimal reaction conditions, and under the conditions, carrying out reaction on various 3, 3 '-dihydroxy nicotinic acid and 3, 3'-dihydroxy nicotinic acid to obtain the nerofloxacin chiral piperidylamine intermediate. The 2, 5-disubstituted pyridine quaternary ammonium salt is reduced into a tetrahydropyridine product, and the C5 site enantioselectivity of the product is excellent. The preparation method comprises the following steps: selecting methyl (R)-1-benzyl-5-hydroxy-1, 4, 5, 6-tetrahydropyridine-3-carboxylic acid methyl ester as a substrate, completely hydrogenating by using platinum dioxide hydrogen, and then carrying out methyl ester reduction, dehydroxylation, Mitsunobu reaction and protecting group removal to obtain a key chiral intermediate for industrial synthesis of a quinolone antibacterial drug nemonofloxacin with high enantioselectivity and high yield.

The invention relates to a preparation method of high-purity vanadium pentoxide, in particular to the field of high-purity vanadium pentoxide, which comprises the following steps: adding an impurity removal agent into a phosphorus-containing vanadium solution to remove impurities, and then carrying out solid-liquid separation to obtain filtrate; the obtained filtrate is sequentially subjected to first pH value adjustment, second pH value adjustment, ammonium salt vanadium precipitation, dehydration, calcination deamination and melting, and high-purity vanadium pentoxide is obtained; wherein the impurity removing agent is prepared from calcium salt and a flocculating agent; the final pH value of the first pH value adjustment is 4.5-5.5; the final pH value of the second pH value adjustment is 1.8-2.2. According to the preparation method provided by the invention, the vanadium in the vanadium liquid is efficiently recovered by matching the metallographic phase specific impurity removal process of the vanadium liquid with pH value adjustment, the purity of the obtained vanadium product is greater than or equal to 99.9%, and the recovery rate of the vanadium is greater than or equal to 98%.

The present application relates to a kind of high-efficiency separation and recovery of hydrogen chloride eutectic absorbent, belong to gas separation and purification technical field.The eutectic absorbent is by quaternary ammonium salt and polyol with certain proportion compound, synthesis raw material is abundant and easy to obtain, synthesis process is simple and easy to operate, and absorbent scale preparation is safe and reliable.The anion and cation of quaternary ammonium salt in eutectic absorbent and the hydroxyl of polyol can provide multiple hydrogen bond acceptor and hydrogen bond donor, which is beneficial to the absorption of hydrogen chloride, and hydrogen chloride can be completely desorbed by heating or reducing pressure, and the regenerated absorbent can be recycled.The absorbent has low cost, small viscosity, good stability and can be recycled, and is a new type of solvent for efficient separation and recovery of hydrogen chloride, which has wide application prospect in separation and recovery of industrial tail gas containing hydrogen chloride.

The invention belongs to the field of methanol conversion and utilization, and particularly relates to a three-layer multi-core structure catalyst for high-selectivity synthesis of monomethylamine and a preparation method of the three-layer multi-core structure catalyst. The core layer of the catalyst is gamma-aluminum oxide, the middle layer of the catalyst is a mordenite (MOR) molecular sieve, and the outer layer of the catalyst is porous SiO2. The preparation of the multi-core MOR layer adopts a steam-assisted crystallization method, the preparation method is simple, no organic waste liquid is generated, the preparation method is environment-friendly, the multi-core MOR layer can be used in a reaction for preparing methylamine through continuous gas phase catalytic amination of methanol after being modified by ammonium ion exchange and chemical liquid phase deposition (CLD), the methanol conversion rate reaches 98.6% under the reaction conditions that the temperature is 340 DEG C, the methanol liquid hourly space velocity is 1.5 h <-1 >, the ammonia-alcohol ratio is 3 and the pressure is normal, and the method is suitable for industrial production. The mass ratio of monomethylamine is greater than 60%, and the method has a good application prospect.

The invention belongs to the technical field of chemical engineering and secondary resource utilization, and particularly discloses a collaborative utilization process of sodium sulfate and ammonium-containing waste salt. The high-value utilization method of sodium sulfate provided by the invention comprises the following steps: mixing sodium sulfate, organic ammonium salt and sulfuric acid, and adding water to prepare a mixed solution; extracting the mixed solution by using an extracting agent, and separating a water phase from an organic phase; adding a pH regulator into the water phase to regulate the pH to alkalescence, introducing carbon dioxide gas to fully react, cooling, crystallizing, and filtering to obtain filtrate and sodium bicarbonate precipitate; heating the filtrate for evaporative crystallization to obtain ammonium sulfate; and recovering the organic acid in the organic phase. The invention provides a subversive solution for sodium sulfate by-product accumulation and ammonium-containing wastewater treatment, has double values of resource circulation and carbon emission reduction, and has the advantages of full-flow closed-loop design, wide applicability, high product purity and high economical efficiency in process.

The invention relates to the technical field of sewage treatment, in particular to a preparation method of a degradable bactericide for an oil field. According to the invention, a hydroxypropyl guanidine gum-polycaprolactone-ethylenediamine fragment copolymer is taken as a carrier, a methylisothiazolinone quaternary ammonium salt (Q-MIT) bactericide is loaded, and the degradable bactericide for the oil field is obtained by cooperating with a dodecyl ethyl sulfide (TC-SE) bactericide and combining with sodium polyaspartate. A carrier forms a hydrogen bond with a polar group on the surface of a biological membrane through a hydroxypropyl guanidine gum main chain to realize targeted anchoring, a polycaprolactone branched chain encapsulates Q-MIT through a hydrophobic effect, primary amino groups of ethylenediamine are introduced to form a pH sensitive Schiff base bond with Q-MIT, and the primary amino groups and adipic dihydrazide form a thermal response hydrazide bond to construct a dual dynamic covalent bond, so that controlled release of Q-MIT is realized, and the biomembrane is prepared. And moreover, the components of the whole system are connected through degradable chemical bonds, so that the environmental protection property and sustainability of oil field operation are guaranteed.

The invention belongs to the field of mineral flotation, and particularly relates to a method for enriching rubidium and / or cesium in minerals through flotation, which comprises the following steps: mixing to-be-selected minerals containing at least one target element in rubidium and / or cesium with a flotation reagent containing a collecting agent shown in formula 1 for flotation, and collecting to obtain flotation concentrate enriched with the target element; r is alkyl of C10-C18, and M is H, Na, K or ammonium ions. Researches show that the formula 1 is innovatively adopted as the collecting agent, and the collecting agent can be based on intramolecular-COO and R-N-at the alpha position of the intramolecular-COO, so that the collecting characteristics of the rubidium and / or cesium minerals can be synergistically and adaptively achieved, and the excellent collecting and enriching effect of the rubidium and / or cesium minerals can be obtained.

The present solution provides a preparation method for a three-dimensional structured ferrous phosphate pigment with corrosion early warning capability, including following steps: preparing a ferrous ion-containing solution for providing ferrous ions, where the ferrous ion-containing solution includes a soluble ferrous salt and a surfactant but no oxidizing ions, and the ferrous ion-containing solution is maintained in an acidic environment; preparing an initial mixed solution for providing phosphate ions and ammonium ions; and performing ultrasonic refinement, heating, and holding on the intermediate mixed solution using an auxiliary device with ultrasonic oscillation and microwave heating functions to obtain a final mixed solution; and filtering out precipitates from the final mixed solution, and then transferring the precipitates to a vacuum environment for high-temperature heating treatment to obtain a three-dimensional structured ferrous phosphate pigment with corrosion early warning capability.

The invention discloses a graded porous mordenite catalyst as well as a preparation method and application thereof, and belongs to the technical field of heterogeneous catalysis and chemistry and chemical engineering. The preparation method comprises the following steps: carrying out hydrolysis-polycondensation reaction on a silicon source, an aluminum source, an alkali source and water, after the reaction is completed, adding an alpha, omega-biquaternary ammonium salt surfactant as a template agent, and carrying out template-oriented self-assembly reaction to obtain gel; carrying out hydrothermal crystallization treatment on the gel to obtain zeolite raw powder; roasting the zeolite raw powder for the first time to remove the template agent so as to obtain roasted zeolite; and carrying out ion exchange treatment on the roasted zeolite, and roasting again to obtain the graded porous mordenite catalyst. According to the invention, the alpha, omega-biquaternary ammonium salt surfactant is used as the template agent to prepare the hierarchical porous structure catalyst with both inherent micropores and uniform mesopores, so that mass transfer can be improved and acidic sites can be optimized.

The invention discloses a preparation method of high-purity bis (fluorosulfonyl) imide alkali metal salt. The method comprises the following steps: (1) synthesizing bis (chlorosulfonic acid) imide by taking sulfamic acid, chlorosulfonic acid, thionyl chloride and chlorosulfonic acid isocyanate as raw materials; (2) fluorinating the bis (chlorosulfonic acid) imide by ammonium fluoride to obtain bis (fluorosulfonyl) imide ammonium salt; (3) treating the imidodisulfuryl fluoride ammonium salt solution with a strong acid ion exchange column and concentrating under reduced pressure to obtain imidodisulfuryl fluoride; (4) reacting the alkali metal salt with bis (fluorosulfonyl) imide to obtain bis (fluorosulfonyl) imide alkali metal salt; and (5) carrying out a series of purification processes on the bis (fluorosulfonyl) imide alkali metal salt to obtain the high-purity bis (fluorosulfonyl) imide alkali metal salt. The preparation method has the advantages of mild reaction conditions, low danger coefficient in the technological process, easiness in control, no use and generation of corrosive acid, greenness and environmental protection, and high yield and high purity of the bis (fluorosulfonyl) imide alkali metal salt, and is suitable for large-scale industrial application.

A method for preparing 1,2-propanediol involves continuously reacting propene with hydrogen peroxide in the presence of a catalyst mixture, containing a quaternary ammonium salt and a polytungstophosphate, in a liquid reaction mixture containing an aqueous phase with a maximum apparent pH of 6 and an organic phase containing an alkylaromatic hydrocarbon solvent. The method then involves withdrawing the liquid reaction mixture from the reaction and adding a water-soluble sulfate salt or sulfuric acid to provide a mixture containing from 500 to 10,000 mg / kg of sulfate ions in the aqueous phase. The method further involves separating the mixture obtained into an aqueous phase (Pa) containing 1,2-propanediol and an organic phase (Po), recycling at least a part of the organic phase (Po) to the reaction, and recovering 1,2-propanediol from the aqueous phase (Pa). The method allows for extended operation of the reaction with little loss of tungsten and phase transfer catalyst.

This invention discloses a method for preparing a high-temperature resistant, strongly basic anion exchange resin, belonging to the field of ion exchange resins. The method includes three steps: First, white spheres with a crosslinking degree of 6-10 undergo a chloromethylation reaction by sequentially adding zinc dichloride and tin tetrachloride to improve the uniformity of the chloromethyl group distribution in the chlorospheres; second, the chlorospheres undergo an etherification reaction using tetrabutylammonium bromide as a phase transfer catalyst, and the dropping rate of sodium methoxide solution is controlled to improve the etherification conversion rate; finally, the etherification product undergoes a quaternization reaction with a trimethylamine aqueous solution to obtain the strongly basic anion exchange resin. This invention, by selecting the degree of crosslinking and optimizing the catalyst addition method for chloromethylation and the sodium methoxide dropping rate for the etherification reaction, results in a more uniform distribution of quaternary ammonium groups in the resin, significantly improving the ion exchange capacity and high-temperature resistance of the resin.

The invention relates to an adsorbent based on an X molecular sieve and preparation and application thereof, and a preparation method of the adsorbent comprises the following steps: (1) mixing the X molecular sieve with a binder, molding and roasting to obtain a molded body; (2) treating the molded body obtained in the step (1) with an alkali solution to perform in-situ crystallization on the binder in the molded body to obtain a crystallized product; (3) carrying out partial barium ion exchange on the crystallized product obtained in the step (2) by using a barium salt solution, and drying to obtain a dried product; (4) carrying out ammonium ion exchange on the dried product obtained in the step (3) by using an ammonium salt solution, and roasting in a flowing atmosphere to obtain a roasted product; and (5) performing barium ion exchange and optional potassium ion exchange on the roasted product obtained in the step (4), and then drying to obtain the adsorbent. The adsorbent has at least two kinds of mesoporous channels with different apertures, has high barium ion exchange capacity, high adsorption capacity and compressive strength, and shows good adsorption selectivity and mass transfer performance when used for adsorption separation of p-xylene.

The invention discloses a preparation method and application of a catalyst based on pyridine ionic liquid, and belongs to the technical field of catalyst preparation. According to the invention, a hydrolysis reaction of a silane coupling agent is utilized to prepare a silicon oxide nanotube containing a pyridine unit, and then a quaternization reaction is carried out to obtain the catalyst based on the pyridine ionic liquid. The catalyst has a high specific surface area and a rich pore channel structure, exposure of active sites and contact of the active sites and reactants are facilitated, and the catalytic rate is increased. Meanwhile, the silicon oxide nanotube contains hydroxyl, and can cooperate with a pyridine ionic liquid site to catalyze a carbon dioxide cycloaddition reaction. The obtained catalyst can catalyze the reaction of carbon dioxide and an epoxy compound to prepare cyclic carbonate under solvent-free and metal-free conditions, and the catalyst is easy to recover and simple in product purification, and has a good application prospect.

The invention relates to the technical field of corrosion inhibitors for oil wells, in particular to a multipurpose high-temperature acidizing corrosion inhibitor for an oil field and a preparation method thereof, and the multipurpose high-temperature acidizing corrosion inhibitor for the oil field is obtained according to the following method: adding a required amount of N 'N-dimethylformamide, butynediol and an emulsifier into self-made bis-schiff base quaternary ammonium salt, fully stirring, then adding benzotriazole, and stirring to obtain the multipurpose high-temperature acidizing corrosion inhibitor. According to the invention, the self-made bis-Schiff base quaternary ammonium salt can form a compact and firm adsorption film on a metal matrix, so that contact between an acid solution and metal is reduced, and effective protection is realized; the raw materials are also compounded with other small molecular compounds of N 'N-dimethylformamide, butynediol emulsifier and benzotriazole, so that the multipurpose high-temperature acidizing corrosion inhibitor for the oil field has the characteristics of strong adaptability, good temperature resistance and good corrosion inhibition effect aiming at different acid liquor types.

The invention belongs to the technical field of petroleum drilling engineering, and discloses a chitosan-quaternary ammonium salt modified composite shale inhibitor and a preparation method thereof. According to the inhibitor, natural chitosan is used as a main chain, dimethyl diallyl ammonium chloride (DMDAAC) is adopted for free radical grafting modification, glycine is combined as a synergistic auxiliary agent, and a composite structure with high cation density is constructed. The preparation method comprises the following steps: dissolving 15-25 parts of chitosan in 1000 parts of 1% glacial acetic acid, and stirring at room temperature; dropwise adding 2 to 4 parts of DMDAAC, reacting at 65 to 75 DEG C, and then adding 0.1 to 1 part of ammonium persulfate for grafting for 3.5 to 4.5 hours; and cooling, filtering and drying to obtain powder. And dissolving 10-20 parts of the solution in deionized water, adding 1.5-2.5 parts of glycine, and uniformly mixing to obtain the composite inhibition liquid. The inhibitor has good water solubility and thermal stability, can significantly inhibit shale hydration expansion and particle dispersion, and experiments show that the inhibitor can be suitable for well wall stability control of complex stratums such as high-temperature deep wells and the like, and has good field adaptability and industrial popularization value.

The invention discloses application of a carbon steel corrosion inhibitor based on combination of physical adsorption, chemical adsorption and hydrophobic barrier, and relates to the technical field of metal corrosion inhibition. The technical problem that a corrosion inhibitor in the prior art is low in corrosion inhibition efficiency in a high-temperature strong-acid environment is solved. The preparation method of the carbon steel corrosion inhibitor comprises the following steps: firstly, ultrasonically dissolving 4-aminopyridine to obtain a solution I; then, dropwise adding an isopropanol solution of 2, 3-epoxypropyltrimethylammonium chloride into the solution I according to a molar ratio of 1: 1, removing a solvent through a rotary evaporation method, washing with ethanol, centrifuging to obtain quaternized 4-aminopyridine, and drying the quaternized 4-aminopyridine; and finally, the dried quaternized 4-aminopyridine and bromododecane are added into acetonitrile for a reaction, diethyl ether is dropwise added into obtained reaction liquid for precipitation, and the quaternized 4-aminopyridine-bromododecane carbon steel corrosion inhibitor is obtained after drying. The prepared carbon steel corrosion inhibitor is high in corrosion inhibition efficiency in a high-temperature and strong-acid environment.

The invention belongs to the technical field of novel material catalysis, and particularly relates to a hollow mesoporous silica supported phosphotungstic acid catalyst and a preparation method and application thereof. According to the invention, the advantages of high specific surface area and regional effect performance of hollow mesoporous silica and the characteristic of adjustable acidity of vacancy heteropolyacid quaternary ammonium salt are innovatively combined, and the cationic surfactant is loaded on the surface of the hollow mesoporous silica, so that the contact surface of raw materials is effectively increased, efficient conversion of reactants is assisted, and the reaction efficiency is improved. The supported catalyst with efficient catalysis and stable performance is obtained. The catalyst can be used for a reaction for preparing glutaraldehyde through heterogeneous catalysis of cyclopentene oxidation, and the reaction condition is mild. Experiments show that under the catalytic system, the cyclopentene conversion rate can reach 90% or above, the glutaraldehyde selectivity is improved to 75% or above, double improvement of the cyclopentene conversion rate and the glutaraldehyde selectivity is successfully achieved, meanwhile, the advantage that the catalyst is easy to separate is achieved, and an efficient solution is provided for industrial application of synthesis of glutaraldehyde through cyclopentene oxidation.

The specific embodiment of the invention provides an anti-rust coating and a coating, the anti-rust coating comprises a water-based rust conversion agent and a water-based epoxy coating, the water-based rust conversion agent comprises a water-based acrylic emulsion and ammonium polyacrylate salt, the pH value of the water-based rust conversion agent is 6-8, Fe < 3 + > is converted into a stable complex in situ through a carboxyl chelation reaction, and the stable complex is added into the water-based epoxy coating. The water-based rust conversion agent and the epoxy coating have the advantages that the water-based rust conversion agent is added into the water-based epoxy coating, the continuous acid etching risk of a matrix is avoided, the water-based epoxy coating comprises polydopamine grafted and coated silicon dioxide, micropores can be reduced by the coating, permeation of water, oxygen and chloride ions can be inhibited, hydrolytic stripping and secondary corrosion can be prevented, and the water-based rust conversion agent and the epoxy coating have good compatibility; the formed coating is excellent in interlayer adhesive force and compact and firm in film layer, and the long-acting protection requirement in a severe corrosion environment can be met when the anti-rust coating is used for coating corrosion prevention of a steel member.

The invention belongs to the field of mineral treatment, and particularly relates to a selective leaching method for scandium in a scandium-containing mineral, which comprises the following steps: roasting the scandium-containing mineral and an additive to obtain a roasted material, and mixing the roasted material with a leaching agent for leaching to obtain a scandium-rich leachate; the additive is an inorganic salt of at least one cation of sodium, calcium, potassium and ammonium; the leaching agent comprises an aqueous solution of a component A and an aqueous solution of a component B, wherein the component A is a C2-C10 water-soluble binary or above carboxylic acid compound; the component B is a water-soluble salt of the component A; the molar ratio of the component A to the component B is 1: (0.5-5); and the concentration of the component A in the leaching agent is 1-15 mol / L. According to the method, the scandium-containing mineral is roasted and modified through the additive, and then the scandium-containing mineral is leached through the buffer system containing the component A and the component B, so that synergy can be achieved, and scandium in the scandium-containing mineral can be selectively and efficiently extracted.

A method of preparing 2-hydroxyadpic acid and adipic acid is provided. The method of preparing 2-hydroxyadpic acid and adipic acid comprises a step of the electrolysis of 2,5-furandicarboxylic acid using a metal electrode at a constant current in a sulfuric acid solution containing a quaternary ammonium salt. The metal electrode is a bismuth electrode or a lead electrode. The quaternary ammonium salt is represented by formula (I):wherein R1 to R4 are independently a C2-5 hydrocarbon group, and X− is ClO4−, H2PO4−, or Br−.

The invention provides a copper etching solution and application thereof. The copper etching liquid comprises an inorganic acid, hydrogen peroxide, an azole compound, a halogen ion source and an amine compound, wherein the amine compound is selected from a compound shown in a formula 1 or an ammonium salt with a structural fragment shown in a formula 2. When the copper etching solution is applied to etching treatment on a chemical copper plating seed layer by a semi-additive method, the copper etching solution shows excellent differential etching capability, and has no obvious etching on the side wall of electroplating copper and the seed layer at the bottom of a copper circuit on the basis of effectively removing the seed layer between the copper circuits, so that the etching quality of the copper plating seed layer is improved. The undercut phenomenon can be prevented, the line width reduction amount is small, and the reliability degree of micronized line wiring can be obviously improved.

The invention relates to the technical field of SCR (Selective Catalytic Reduction) denitration system equipment, in particular to an SCR denitration self-heating anti-blocking ammonia spraying nozzle and equipment, the ammonia spraying nozzle is provided with a double-layer sleeve structure, so that a heating cavity for mounting a heating device is formed between two sleeves; the inner pipe conveys mixed gas of ammonia gas and air, generation and attachment of viscous substances such as ammonium bisulfate are effectively avoided through heating of the heating device in the heating cavity, guide vanes are arranged in a nozzle at the end of the inner pipe, dust, ammonium salt and other substances attached to the position close to the nozzle are thrown away through centrifugal force, and the dust, the ammonium salt and other substances are prevented from being accumulated to block the nozzle; the ultrasonic generator is arranged on the outer pipe, so that ultrasonic waves can be emitted regularly, the inner pipe generates tiny vibration, dust, ammonium salt and other substances attached to the surface of the inner pipe are vibrated off, the self-cleaning function is achieved, the risk that the spray head is blocked is further reduced, and the problem that the ammonia spraying spray head is prone to being blocked is fundamentally solved.

The invention relates to the technical field of dechlorinating agents, in particular to a dechlorinating agent and a preparation method thereof. The preparation method of the dechlorinating agent comprises the following steps: 1) uniformly mixing quaternary ammonium salt and organic amine, then adding silicate ester, uniformly mixing, reacting for 2-6 hours, carrying out solid-liquid separation, washing a solid, and drying; 2) roasting the solid dried in the step 1) at 550-650 DEG C for 5-10 hours, and cooling to obtain a carrier; 3) uniformly mixing the carrier prepared in the step 2) with a calcium source and a zinc source in water, adjusting the pH value to 10-12, reacting, standing, carrying out solid-liquid separation, and drying the solid, and 4) calcining the dried solid in the step 3) at 800-1000 DEG C for 10-24 hours, and cooling to obtain the dechlorinating agent. The prepared dechlorinating agent is uniform in pore diameter and high in penetrating chlorine capacity, and can effectively reduce the loss of active ingredients.

The invention relates to the technical field of precious metal recovery and purification, in particular to a metal rhodium recovery and purification method which comprises the following steps: S1, adjusting the pH value of rhodium leaching liquid, heating, adding a reducing agent, and filtering after reaction to obtain primary impurity removal liquid; s2, controlling the pH value of the primary impurity removal liquid to be 1.5-2, heating, adding thiodiglycolic acid and ammonium salt, reacting, and performing solid-liquid separation to obtain primary rhodium-containing precipitate; s3, dispersing the primary rhodium-containing precipitate in an acid solution, adding a strong oxidant, carrying out heating reflux, and adjusting the pH value to 6-7 to obtain a secondary rhodium-containing precipitate; s4, dispersing the secondary rhodium-containing precipitate in a solution with a pH value of 13-14 for pulpifying, adding a reducing agent, carrying out a reduction reaction at 90-100 DEG C, and carrying out solid-liquid separation to obtain a tertiary rhodium-containing precipitate; s5, calcining the third rhodium-containing precipitate, and performing hydrogen reduction to obtain metal rhodium; the method has the advantages that the recovery efficiency of rhodium can be improved, and the pressure on the environment is reduced.

The invention discloses a pH / temperature dual-response type quaternary ammonium salt-nano silver-zinc oxide composite antibacterial coating material as well as a preparation method and application thereof, and belongs to the technical field of antibacterial materials. The antibacterial effective life of the coated product is at least up to 5 years. The coating product is preferably a gastrointestinal endoscope, efficient bacteriostasis is achieved under the condition that the light transmittance of the gastrointestinal endoscope is not affected, biocompatibility is good, safety is high, precise controlled release of silver ions is achieved, and biotoxicity caused by sudden release of the silver ions is avoided. The quaternary ammonium salt-nano silver-zinc oxide composite coating material with the pH / temperature dual-response antibacterial effect is finally obtained through the steps of preparing a composite carrier material, loading antibacterial metal elements, constructing a pH / temperature dual-response polymer network and the like in sequence. A high-performance, safe and environment-friendly antibacterial coating system which is rapid in sterilization, precise in controlled release and long-acting in interference resistance is constructed, and an antibacterial solution with high technical adaptability is provided for the fields of medical treatment, food, water treatment and the like.

The invention provides a method for preparing high-purity vanadium pentoxide from a sodium vanadium solution. The method comprises the following steps: firstly, through chromium removal, calcium removal and silicon removal treatment, reducing the contents of chromium, calcium and silicon in the sodium vanadium solution to a target requirement, namely Crlt; the concentration is 0.005 g / L, and the concentration is Cat; 0.01 g / L, Silt; 0.01 g / L; then, aluminum is removed through a two-step method, the pH of the system can be accurately controlled, and the aluminum content in the solution is reduced to be smaller than 0.001 g / L; finally, ammonium salt is added to obtain AMV sediment, after the potassium content in the AMV sediment is preferably controlled to be reduced to 0.001 wt%, calcination is conducted, a vanadium pentoxide product can be obtained, and the sulfur content can be lower than 0.001 wt%.