50 results about "Iminodiacetic acid" patented technology

The invention relates to the technical field of resource recycling of manganese-containing wastewater, in particular to a process for preparing industrial-grade manganese carbonate by using a recycled manganese chloride solution, which adopts a two-stage purification and impurity removal strategy, performs primary purification and impurity removal by using sodium sulfide and sodium fluoride, and performs secondary impurity removal by using iminodiacetic acid grafted chelating resin. According to the invention, the problems of poor adaptability and incomplete impurity removal of the manganese chloride solution in the prior art are solved, the purity of the product is obviously improved so as to meet the requirements of the industrial grade manganese carbonate, and the process flow is simple.

The invention provides epoxy resin for halogen-free flame-retardant self-leveling powder coating and a preparation method of the epoxy resin, and belongs to the technical field of powder coating. The flame retardant is mainly prepared from anhydrous piperazine, bisphenol A diglycidyl ether, trihydroxymethyl phosphorus oxide, triethyl phosphite, epoxy chloropropane, sodium hydroxide, N-methyl iminodiacetic acid, ethylene glycol diglycidyl ether and other main raw materials through polymerization. The prepared epoxy resin and 2-phenylimidazoline are subjected to low-temperature curing (135 DEG C / 20 min) on the premise that an additional flatting agent does not need to be used, the flexibility of a coating film is good, the impact resistance grade is high, the impact performance reaches the condition that no cracking phenomenon exists in the front and back 60cm, the leveling grade reaches the grade 7 or above, the gloss is high and reaches 95% or above, the oxygen index reaches 34% or above, and the halogen-free flame retardant performance is excellent.

The invention discloses a treatment method of electroplating wastewater, and belongs to the technical field of electroplating wastewater treatment. The process comprises the following steps: electrically adjusting the pH value of the electroplating wastewater to 2.5-4.0, adding ferrite, adopting a Ti / PbO2 anode and a graphite cathode, controlling the current density to 15-30mA / cm, introducing air, reacting for 40-80 minutes, and adjusting the pH value to 6.0-7.0 after the reaction; introducing the wastewater into a chelating resin column, wherein the chelating resin is an amino phosphonic acid type or iminodiacetic acid type; the method comprises the following steps of: introducing into a built-in filter column, loading two layers of recrystallized silicon carbide honeycomb ceramic membranes in the filter column in parallel, performing cross-flow filtration under the conditions that the operation pressure is 0.8-2.0 MPa, the temperature is 25-40 DEG C and the cross-flow velocity is 1.5-3m / s, and collecting permeate; the permeate liquid is used for backwashing every 8-12 hours of operation. According to the method, heavy metal ions in the electroplating wastewater can be effectively removed, and the treatment efficiency of the electroplating wastewater is improved.

The application relates to the technical field of lithium ion batteries, and discloses a silicon-carbon nanotube composite material, which is obtained by dehydration of hydroxylated silicon particles, hydroxylated carbon nanotubes and iminodiacetic acid. The silicon-carbon nanotube composite material provided by the application can anchor the silicon particles on the carbon nanotubes through covalent bond action, can increase the uniformity of dispersion of the carbon nanotubes and the silicon particles, can improve the electron transmission capacity, can play a certain counterforce on the volume expansion force of the silicon particles, can reduce the generation of electrode cracks, can further reduce the consumption of electrolyte, and can improve the cycle stability of the whole electrode. Meanwhile, the preparation method provided by the application does not need a complex operation process, has simple process condition requirements, and is suitable for large-scale production.

The invention belongs to the technical field of pharmaceutical chemicals, and particularly relates to a method for preparing guanidinoacetic acid from glycine mother liquor. Based on a glycine-cyanamide method, a glycine solution containing iminodiacetic acid is used as one of reaction raw materials. When the method is used for preparing the guanidinoacetic acid, the glycine mother liquor can be directly used for preparing the guanidinoacetic acid, so that the mother liquor is directly treated, the separation step of the glycine mother liquor is omitted, and the process is simplified. Moreover, the method has an unexpected technical effect on the improvement of the yield of the guanidinoacetic acid, and the yield of the guanidinoacetic acid is improved by 6.2-6.4% compared with the prior art.

This invention relates to the field of high-purity material analysis technology, and discloses a method for simultaneously separating and enriching copper, cadmium, nickel, cobalt, zinc, lead, and barium in lithium carbonate. The steps are as follows: dissolving a lithium carbonate sample in nitric acid to obtain an acidified sample solution; adjusting the acidified sample solution to an alkaline pH range of 9.5-10.5 using an ammonia-ammonium acetate alkaline buffer solution; passing the alkaline solution through a solid-phase extraction column filled with iminodiacetic acid-type chelating resin, where copper, cadmium, nickel, cobalt, zinc, lead, and barium ions are selectively adsorbed onto the resin; and eluting the adsorbed heavy metal ions with acid to achieve separation and enrichment. This invention effectively overcomes the inhibition and interference of the lithium carbonate matrix on the detection of trace heavy metals, and in particular significantly improves the adsorption and recovery rate of elements such as barium. It achieves efficient separation and enrichment of multiple heavy metals in complex matrices, providing a reliable pretreatment solution for high-sensitivity and high-accuracy quality control analysis of lithium carbonate products.

The invention belongs to the technical field of sodium ion batteries, and particularly relates to a composite sodium supplement additive which comprises the following raw material components: disodium iminodiacetate, conductive porous carbon and a metal oxide quantum dot catalyst, the metal oxide quantum dot catalyst is coated with the disodium iminodiacetate active particles, and the disodium iminodiacetate active particles are adsorbed on the inner wall and the outer wall of the conductive porous carbon to form the composite sodium supplement additive, and the particle size of the composite sodium supplement additive is 1-500 nm. The composite sodium supplement additive takes conductive porous carbon as a load matrix; the conductive porous carbon comprises any one or more of activated carbon, carbon nanotubes, ordered mesoporous carbon and bamboo charcoal. The active ingredients in the composite sodium supplement agent are small in particle size, good in conductivity and low in decomposition voltage, and an excellent sodium supplement effect can be achieved under the condition of low addition.

This invention provides a MoTi film composite etchant composition, relating to the field of metal film etching technology. The composite etchant composition comprises hydrogen peroxide, ammonium hydrogen fluoride, a weak organic acid, a corrosion inhibitor, cis-1,4-cyclohexanedicarboxylic acid, 3-amino-1,2,4-triazole, a complexing agent, iminodiacetic acid, an organic alcohol, and water; and the ratio of ammonium hydrogen fluoride to cis-1,4-cyclohexanedicarboxylic acid is ≥0.2. This invention overcomes the shortcomings of existing technologies, effectively improving the etching efficiency of MoTi films while reducing erosion of adjacent metal layers, achieving precise control of the etching rate, ensuring etching stability, and significantly improving product yield.

The invention discloses an etching solution for alloy surface treatment and a preparation method thereof, and relates to the field of etching solutions. The preparation method comprises the following steps: firstly, preparing mesoporous titanium dioxide by a sol-gel method, modifying the mesoporous titanium dioxide by an amino coupling agent, loading green tea polyphenol and preparing a self-made corrosion inhibitor from konjac glucomannan grafted with quaternary ammonium groups, adsorbing dopamine by utilizing electrostatic interaction, and polymerizing to form pH response hydrophilic particles; in the etching process, when the solution is slightly acidic, the corrosion inhibitor is released to inhibit excessive etching; meanwhile, carboxymethyl cellulose is grafted with sulfonic acid groups, N-(phosphonomethyl) iminodiacetic acid modified chitosan is used for preparing complexing agents A and B, and after compounding, the complexing agents A and B are mixed with components such as hydrophilic particles to obtain etching liquid; the compound complexing agent can form a strong coordination bond with metal ions and can also be chelated with heavy metal ions; chitosan, phosphonic acid groups and hydrophilic particles cooperate with one another, so that the surface hydrophilicity of the alloy is improved, and hydrolytic precipitation and scale attachment are effectively inhibited. The prepared etching liquid for alloy surface treatment has the effects of high efficiency and uniform etching.

This invention relates to the field of sodium-ion battery electrode materials technology, and provides a method for the complete dissolution preparation of a carbon-coated sodium carbonate pre-sodiumizing agent: sodium polyacrylate and disodium iminodiacetic acid are added to deionized water and stirred until completely dissolved to form a homogeneous and transparent mixed aqueous solution; the solution is then spray-dried and granulated to obtain spherical precursor microspheres; the precursor microspheres are calcined at 450-950℃ for 0.5-12 hours under an inert atmosphere, and after natural cooling, the carbon-coated sodium carbonate pre-sodiumizing agent is obtained. This invention also provides the carbon-coated sodium carbonate pre-sodiumizing agent prepared by the above method and its applications. The preparation process of this invention is simple, the raw materials are inexpensive and readily available, and the resulting product has good particle dispersibility, no obvious agglomeration, uniform and complete carbon coating, excellent desodiumization performance, and high pre-sodiumization efficiency. It can significantly improve the initial coulombic efficiency and cycle stability of sodium-ion full batteries, is compatible with existing battery industrial production systems, and has good prospects for industrial application.

The application relates to an iminodiacetic acid type chelating resin and a preparation method and application thereof, and the preparation method comprises the following steps: (1) in the case that the stirring speed is 200-350 r / min, two dispersants are dissolved in water, then ethylbenzene, glycidyl methacrylate, trimethylolpropane trimethacrylate, isooctane and di-t-butyl peroxide are added, the raw materials are reacted after ultrasonic mixing, centrifugal separation is carried out after the reaction is completed, the filter cake is cleaned and dried, and resin microspheres are obtained; (2) in the stirring state, the resin microspheres obtained in the step (1) are added into water, then iminodiacetic acid is added, stirring is continued, then preliminary reaction is carried out by heating, NaOH is further added, reaction is carried out by heating, after the reaction is completed, filtration, cleaning and drying are carried out, and the iminodiacetic acid type chelating resin is obtained. The chelating resin particle size can be controlled, the particle size is relatively large, the specific surface area is large, the adsorption capacity is high, and the chelating resin can be used for adsorbing lead ions in heavy salt matrix.

This invention discloses a method for preparing a retarder for acid fracturing. The retarder is obtained by copolymerizing a nonionic water-soluble monomer, a silicon-containing monomer, an organic acid adsorbent monomer, and a hydrophobic monomer in an anhydrous organic solvent. After the reaction, the resulting product is directly used as an additive in the working fluid without the need for separation and drying. The organic acid adsorbent monomer contains an iminodiacetic acid structure, which chelates with Ca on the surface of carbonate rocks. 2+ Stable adsorption; after hydrolysis, the silicon-containing monomers condense with hydroxyl groups on the rock surface to form chemical bonds, while the condensation and cross-linking between silicon and hydroxyl groups construct a multi-layer network structure; the hydrophobic monomer is an allyl polyoxyethylene alkyl ether, which forms a hydrophobic barrier on the adsorption film surface through hydrophobic association. The resulting retarder, through the synergistic effect of four mechanisms—chelation adsorption, chemical bonding, multi-layer film formation, and hydrophobic shielding—can reduce the acid rock reaction rate by more than 90% at 150°C and in 20% hydrochloric acid, making it suitable for high-temperature carbonate rock acid fracturing operations.

The invention provides a MoTi film layer composite etching agent composition, and relates to the technical field of metal film layer etching. The composite etching agent composition is prepared from hydrogen peroxide, ammonium bifluoride, weak organic acid, a corrosion inhibitor, cis-1, 4-cyclohexanedicarboxylic acid, 3-amino-1, 2, 4-triazole, a complexing agent, iminodiacetic acid, organic alcohol and water. The ratio of the addition amount of the ammonium bifluoride to the addition amount of the cis-1, 4-cyclohexanedicarboxylic acid is greater than or equal to 0.2. According to the method, the defects in the prior art are overcome, the etching efficiency of the MoTi film layer can be effectively improved, meanwhile, corrosion to the adjacent metal layers is reduced, accurate control over the etching rate is achieved, the etching stability is guaranteed, and the product yield is remarkably improved.

The invention relates to the technical field of ceramic glazes, and discloses a high-strength wear-resistant ceramic glaze and a preparation method thereof, 3-chloro-2-chloromethyl propylene and diethyl iminodiacetate are subjected to nucleophilic substitution, the obtained product is hydrolyzed under an acidic condition, and 2-(N, N '-dimethylene carboxyl) aminomethyl-allyl diacetic acid is obtained. And carrying out addition reaction on the poly (ethylene glycol) methacrylate and sodium vinyl sulfonate to obtain the dispersing agent. The preparation method comprises the following steps: adding a dispersing agent into a preparation process of a zirconium silicate precursor, drying to obtain dispersing agent modified zirconium silicate superfine powder, mixing with potassium feldspar, albite, high-purity quartz, calcined kaolin, aluminum oxide, calcium carbonate and zinc oxide, carrying out ball milling, and sieving to remove iron, so as to prepare the high-strength wear-resistant ceramic glaze, so that the wear resistance, high strength and corrosion resistance of the ceramic glaze are improved, and the service life of the ceramic glaze is prolonged. Therefore, the wear resistance, high strength and corrosion resistance of the ceramic product are improved.

The invention discloses a stainless steel pickling waste liquid treatment method, and relates to the technical field of pickling waste liquid treatment.The stainless steel pickling waste liquid treatment method comprises the steps that quaternized iminodiacetic acid functionalized cross-linked chitosan aerogel is prepared, an adsorption column is filled with the quaternized iminodiacetic acid functionalized cross-linked chitosan aerogel, the stainless steel pickling waste liquid is pumped into the adsorption column, and selective adsorption operation is conducted; ni and Cr in the waste liquid are selectively chelated by iminodiacetic acid groups, and F is captured by quaternary ammonium salt groups; when it is monitored that the concentration of Ni or Cr at the outlet end of the adsorption column reaches a preset value, it is regarded that adsorption is saturated, feeding is stopped, and stepwise elution and resource recovery are conducted in sequence; and washing the adsorption column with deionized water until the pH value of an outlet is neutral to complete material regeneration for the next round of adsorption circulation. According to the method, nickel and chromium can be selectively recycled from the strong acid waste liquid, fluorine is synchronously captured, hazardous waste sludge is not produced, the used materials are stable, durable and recyclable, the problems of resource waste and secondary pollution are solved, and recycling and harmless treatment of the waste liquid is achieved.

The invention discloses a method for detecting raw materials, impurities and products in a methylglycine trisodium diacetate reaction solution. The method comprises the following steps: respectively preparing a lactic acid, iminodiacetic acid, dimer and MGDA mixed standard substance solution, a sodium 2-chloropropionate standard substance solution and a sample solution, determining the solutions by utilizing high performance liquid chromatography, and calculating the contents of iminodiacetic acid, dimer, lactic acid MGDA and 2-chloropropionic acid in the sample solution according to a single-point external standard method; the calculation formula is as follows. The detection method is high in analysis accuracy, can be applied to central control analysis of the MGDA synthesis process, can be used for tracking the reaction process and material balance of the synthesis process for preparing MGDA from 2-chloropropionic acid, and is of great significance to quality control of MGDA.

The invention belongs to the technical field of preparation of rare earth nano materials, and particularly discloses a preparation system and method of nano cerium oxide and high-dispersity nano cerium oxide. The preparation system comprises an organic complexing agent and a surface modifier; the organic complexing agent is at least one of polyaspartic acid and derivatives thereof, polyglutamic acid, ethylenediamine disuccinic acid, iminodiacetic acid and sodium alginate; the surface modifier is a silane coupling agent. The preparation method comprises the following steps: preparing a cerium source precursor solution; adding an organic complexing agent and a surface modifier; regulating and controlling the pH value; and washing, aging, drying, grinding and calcining. The nano cerium oxide is prepared by the method. According to the invention, the organic complexing agent is combined with in-situ surface modification, and the complexing mechanism and the preparation process are optimized, so that high dispersity, uniform particle size distribution and controllable synthesis of the nano cerium oxide particles are realized, meanwhile, the harm of the process to the environment is reduced, and the operation process is simplified so as to adapt to industrial production requirements.

The invention relates to the technical field of lithium recovery, in particular to imine diacetic acid-based chelate resin as well as a preparation method and application thereof. The imino diacetic acid chelate resin realizes separation of the imino diacetic acid chelate resin and the sodium and lithium relying on the function of functional groups and the difference of hydration radiuses of the lithium and the sodium, and the lithium adsorbability is slightly higher than that of the sodium. When the resin is saturated by adsorption, a hydrochloric acid solution slowly passes through the resin column, the hydrochloric acid solution can replace lithium ions and sodium ions adsorbed on the resin, but due to the fact that the resin has different selectivity on the lithium ions and the sodium ions, the sodium ions can be analyzed more quickly than the lithium ions with higher selectivity, and a better lithium-sodium separation effect is achieved.

The application provides a metabolic marker combination for early kidney cancer diagnosis and application thereof, and belongs to the technical field of in vitro diagnosis. The metabolic marker combination for early kidney cancer diagnosis comprises a first combination or a second combination. The first combination comprises glycyl-L-glutamic acid, L-glutamyl-L-serine, methylphosphatidylcholine 33:2e and triglyceride 54:7. The second combination comprises glycyl-L-glutamic acid, L-glutamyl-L-serine, L-threonyl-L-aspartic acid, iminodiacetic acid, triglyceride 56:8, O-phosphoethanolamine, methylphosphatidylcholine 33:2e and triglyceride 54:7. By detecting the metabolic marker combination in a blood sample, it can be determined whether a patient has early kidney cancer, has high sensitivity and specificity, can realize precise screening of early kidney cancer, and provides important help for prevention and reduction of the incidence of kidney cancer.

This invention provides a method for manufacturing an organic solvent that reduces metal impurities, which are a cause of minute defects on wafers, during the lithography process in semiconductor device manufacturing, or a method for reducing metal impurities in purified organic solvents. This invention is a method for manufacturing an organic solvent that includes a step of passing liquid through a filter element. The filter element is characterized by laminating or winding a plurality of different types of filter base fabrics into a hollow inner cylinder. The filter base fabric is a nonwoven fabric with chemically bonded metal adsorption groups to polyolefin fibers. The filter base fabric includes a nonwoven layer A and a nonwoven layer B. The nonwoven layer A is composed of polyolefin fibers with chemically bonded sulfonic acid groups as metal adsorption groups. The nonwoven layer B is composed of polyolefin fibers with at least one group selected from the group consisting of amino groups, N-methyl-D-glucosamine groups, iminodiacetic acid groups, iminodiethanol groups, acetobenzoic acid oxime groups, phosphate groups, carboxylic acid groups, and ethylenediaminetriacetic acid groups as metal adsorption groups.

The invention discloses a nickel-based complex as well as a preparation method and application thereof, and belongs to the technical field of functional materials. According to the nickel-based complex, N-(3-carboxyl phenyl) iminodiacetic acid, nickel salt and phenanthroline serve as raw materials, and the zero-dimensional mononuclear nickel-based complex is prepared. The preparation method of the nickel-based complex is mild in condition and simple in process. Crystal structure analysis shows that the complex belongs to a triclinic system space group, a three-dimensional supramolecular network is formed among molecules through O-H... O hydrogen bonds, and the complex has excellent structural stability and thermal stability. The nickel-based complex can be used as an efficient heterogeneous catalyst to activate peroxymonosulfate to degrade methylene blue dye, shows good catalytic activity and reusability, and has important application prospects in the field of dye wastewater treatment.

The invention relates to the technical field of etching solutions, and discloses a multilayer copper-molybdenum etching solution for the LED field, which comprises the following components by mass percent: 5.5-7.5% of sodium perborate; 6%-8% of hydrogen peroxide; 6%-7% of triammonium phosphate; 1%-2% of citric acid; 1%-2% of sodium citrate; 1.0% to 1.5% of iminodiacetic acid; 0.05%-0.1% of tin sulfate; 0.30%-0.45% of a dipotassium hydroxyethylidene-1, 1-diphosphonate solution; 0.08%-0.10% of sodium nitrite; 0.2% to 0.4% of water-soluble mercaptobenzothiazole; 0.02% to 0.05% of ethoxylated acetylene glycol; 0.02% to 0.05% of diethylene triamine pentamethylene phosphonate; and the balance of ultrapure water. A combination of sodium perborate and hydrogen peroxide is adopted as an oxidation system, a composite additive, a novel metal complexing agent and a surfactant matched with the etching solution are adopted, and the multilayer copper-molybdenum etching solution which is moderate in etching rate, good in anisotropy, high in substrate material selectivity and good in chemical stability is prepared.

The invention discloses a lysosome targeting fluorescent probe compound based on a hydrogen peroxide response group protection mechanism. The lysosome targeting fluorescent probe compound comprises a naphthalimide fluorophore, a morpholine group and an N-methyl iminodiacetic acid borate (MIDA borate) protection structure. The morpholine group endows the lysosome with targeting ability, the MIDA borate improves the blood circulation stability, and the naphthalimide fluorophore generates a fluorescence signal after responding to H2O2. The synthesis method comprises the steps of synthesis of a naphthalimide precursor, introduction of a morpholine group and protection of MIDA borate. The probe can specifically recognize H2O2, the lowest detection limit reaches 0.25 mu M, the probe can target HeLa cell lysosome and realize high-sensitivity detection, and the cytotoxicity is low. Response group protection and targeting functions are creatively combined, the problems that an existing probe is poor in blood circulation stability and insufficient in detection specificity are solved, and the probe has important practical value in the fields of disease mechanism research, early diagnosis, medicine research and development and the like.

The present invention is generally directed to improved processes for the preparation of various phosphorus oxides and phosphoric acid. Phosphorus oxides prepared in accordance with the present invention include phosphorus (III) oxides (e.g., tetraphosphorus hexaoxide (P4O6)). Phosphorus (III) oxides such as P4O6 are useful products and are also useful as precursors in preparation of other products, including phosphorous acid (H3PO3) and other phosphorus-containing chemicals. Certain aspects of this invention are also directed to using various byproducts formed during P4O6 production as precursors for the formation of phosphoric acid (H3PO4) and P2O5. In particular, the present invention is directed to improved processes for the preparation of phosphorus (III) oxides (e.g., P4O6) suitable for use in the preparation of phospho-herbicides such N-(phosphonomethyl)glycine (glyphosate) and precursors thereof (e.g., N-(phosphonomethyl)iminodiacetic acid (PMIDA)). The present invention is thus further directed to preparation of these compounds.

The invention discloses an alkalescent zinc-based flow battery negative electrode electrolyte and a preparation method thereof. The alkalescent zinc-based flow battery negative electrode electrolyte comprises zinc salt, deionized water and a complexing agent, wherein the complexing agent is one or more of 2-phosphonobutane-1, 2, 4-tricarboxylic acid, triethylene tetramine, glycine, diethyl ethylenediamine, lysine, N-(phosphoryl methyl) iminodiacetic acid, iminodiacetic acid, hydroxyethylidene diphosphoric acid, iminodisuccinic acid, N-(phosphoryl methyl) glycine, glycolic acid, nitrilotrimethylene phosphoric acid and alendronic acid. According to the invention, the problems that the zinc-based flow battery negative electrode is easy to form dendritic crystals and delay hydrogen evolution and other side reactions during zinc deposition are solved, the reversibility of the zinc negative electrode in the cycle process is improved, the cycle life of the alkalescent zinc-based flow battery is prolonged, and meanwhile, the total battery voltage can also be improved.

This invention discloses a radiation-shielding flexible material and its preparation method, relating to the field of radiation-shielding flexible material technology. In preparing the radiation-shielding flexible material, the invention involves treating a protective powder with γ-chloropropyltriethoxysilane to obtain a pre-modified protective powder; reacting the pre-modified protective powder with a composite antibacterial agent to obtain a modified protective powder; reacting phenylphosphoyl dichloride sequentially with diethyl iminodiacetic acid, ethylenediamine, and benzothiazole-2-carboxaldehyde to obtain a phosphorus-nitrogen-sulfur flame retardant; mixing the modified protective powder, the phosphorus-nitrogen-sulfur flame retardant, and thermoplastic polyurethane, using N,N-dimethylformamide as a dispersant, to prepare a protective slurry; coating the protective slurry onto the surface of a fabric and drying to obtain the radiation-shielding flexible material. The radiation-shielding flexible material prepared by this invention can protect against radiation while also possessing excellent flame-retardant and antibacterial properties.

The present application relates to the technical field of manganese-containing wastewater resource recycling, and particularly relates to a process for preparing industrial-grade manganese carbonate by using recycled manganese chloride solution, which adopts a two-stage purification and impurity removal strategy, i.e., one-stage purification and impurity removal by using sodium sulfide and sodium fluoride, and two-stage impurity removal by using imino-diacetic acid grafted chelating resin, and then the obtained purified solution is reacted with sodium carbonate, filtered and washed to obtain industrial-grade manganese carbonate, thereby solving the problems of poor adaptability and incomplete impurity removal of the existing process when facing manganese chloride solution, significantly improving the purity of the product to meet the requirements of industrial-grade manganese carbonate, and simplifying the process flow.

The application relates to the technical field of electroplating liquid and electronic connector terminal surface treatment, and discloses a palladium-nickel alloy electroplating liquid and a preparation method and application thereof, wherein the electroplating liquid comprises palladium ions provided by tetraammine palladium sulfate, nickel ions provided by nickel sulfamate, ammonium sulfamate, ammonium sulfate, a ladder complex release component composed of glycine, sodium citrate, N-(2-hydroxyethyl) iminodiacetic acid disodium, ethylenediamine disuccinic acid trisodium and polyaspartic acid sodium, L-proline, sodium 1,2,4-triazole-3-carboxylate and a micro-area wetting component. Through cooperation of the components, the application can reduce the edge enrichment deposition and grain boundary pore defects of a high-speed connector contact area, and improve the contact stability of a palladium-nickel alloy plating layer.

The invention relates to a preparation method of ethylene glycol bis (2-aminoethyl ether) tetraacetic acid, and belongs to the technical field of organic synthesis. According to the method, iminodiacetic acid and dichlorotriethyl ether are taken as raw materials, water and ethanol are taken as solvents, and ethylene glycol bis (2-aminoethyl ether) tetraacetic acid is obtained through reaction at 75-85 DEG C under the catalysis of sodium hydroxide. Compared with an existing preparation method, the method has the advantages that the reaction temperature is reduced and does not need to be strictly controlled in a relatively small range. The content of the finally prepared crude product can meet the index requirement only after being washed and pulped. The method is a green and efficient preparation method of ethylene glycol bis (2-aminoethyl ether) tetraacetic acid, and can be industrially popularized.

The invention provides a low-nickel system in-situ complexation electronic-grade iminodiacetic acid refining system, and relates to the technical field of iminodiacetic acid preparation, the refining system integrates in-situ induced complexation, supergravity precipitation and separation, a nanometer gradient screening unit and a developing line cleaning coupling module, a nickel ion solvation layer is stripped through a high-frequency cavitation generator, and a high-purity product is obtained. A nickel complexing precursor is generated through induction of a functionalized filler layer, a horizontal asymmetric rotating drum is used for generating a super-gravity field not lower than 3000g to achieve forced liquid-solid separation, and a multi-layer ceramic composite membrane with the pore diameter gradually decreased from 1 micron to 5 nm is matched with a self-assembled monomolecular membrane to conduct physical interception and chemical adsorption dual refining. The system is assisted by on-line quality monitoring and self-adaptive reflux logic, so that the nickel ion concentration of the produced liquid is stably maintained at an extremely low level of less than or equal to 10ppb, the problems of low reaction activity of nickel in an extremely dilute solution, difficulty in separation of colloidal impurities, precipitation of equipment metal and the like are effectively solved, and a purity guarantee is provided for an advanced semiconductor process.