75 results about "Iminodiacetic acid" patented technology

The invention provides a method for preparing high-purity hafnium tetrachloride by wet extraction and separation, which comprises the following steps: stirring and leaching hafnium alloy waste serving as a raw material by using HNO3 and HF mixed acid, then adding thioacetamide, adjusting the pH value to 4-5, stirring and filtering; compounding tributyl phosphate, trioctylphosphine oxide and sulfonated kerosene to obtain a composite extracting agent, and stirring and mixing to form a homogeneous organic phase; in a hydrochloric acid medium, controlling the volume ratio of an organic phase to a water phase to be (2.5-3.5): 1, carrying out three-stage counter-current extraction, and standing for phase splitting; the extracted organic phase passes through an adsorption column filled with iminodiacetic acid modified silica gel; and carrying out reverse extraction by using a hydrochloric acid solution, and then carrying out reduced pressure evaporation concentration, cooling crystallization and dehydration to obtain hafnium tetrachloride. According to the method, the zirconium and hafnium separation efficiency in the hafnium tetrachloride preparation process is improved, and the problem that the content of zirconium and hafnium impurities in the product is too high is solved.

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 relates to a diamond wire cutting fluid for silicon wafer cutting and a preparation method and application thereof, and the diamond wire cutting fluid comprises the following components by weight: 10-45 parts of a composite additive; 2-6 parts of a functional agent; 10 to 30 parts of a solvent; 0.1-1 part of an auxiliary agent; and 30-50 parts of ultrapure water. The composite additive is used, fatty alcohol-polyoxyethylene ether sulfate has excellent wettability and permeability, after fatty alcohol-polyoxyethylene ether sulfate and N-acyl substituted iminodiacetate are used together, closer interface arrangement can be formed, the dynamic surface tension is reduced more quickly, the wetting process is accelerated, and the wetting and infiltration capacities are improved; the stability of the cutting fluid is kept.

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.

Provided is a technology for more effectively adsorbing scandium by suppressing the amount of chromium adsorbed onto a chelate resin in an ion exchange treatment of an acidic solution containing scandium and impurities including chromium using the chelate resin.　The present invention comprises an ion exchange treatment step for passing an acidic solution containing scandium and impurities including chromium through a column filled with an iminodiacetic acid-type chelate resin to adsorb the scandium onto the chelate resin, wherein, in the ion exchange treatment step, the acidic solution is passed in the range of 40-70ºC, and when the amount of the scandium adsorbed onto the chelate resin is qSc and the maximum amount of the scandium adsorbed onto the chelate resin is qmax,Sc, the passed liquid amount BV in which qSc / qmax,Sc is 0.5 is defined as a lower limit value and the value of the passed liquid amount BV in which the apparent separation factor αapp,Cr(III) Sc(III), defined by the relationship between the scandium and the chromium contained in the acidic solution, is 1 is defined as an upper limit value, and the passed liquid amount BV of the acidic solution is set in the range of the lower limit value to the upper limit value.

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.

The invention relates to an adsorbing material for blood perfusion and a preparation method thereof. The preparation method comprises the following steps: providing a hydrophobic porous carrier which comprises styrene-divinyl benzene copolymer microspheres, and introducing a coordination group on the surface of the hydrophobic porous carrier through chemical modification. The average pore size of the hydrophobic porous carrier is 2-50 nm, and the specific surface area of the hydrophobic porous carrier is greater than or equal to 500 m < 2 > / g; the coordination group is selected from at least one of iminodiacetic acid (IDA), ethylenediaminetetraacetic acid (EDTA) and N, N, N-tricarboxymethyl ethylenediamine (TED). The prepared adsorption material is high in A beta removal capacity, has certain removal capacity on heavy metal ions, is good in blood compatibility and excellent in anticoagulation performance, and is an ideal material for preparing a blood perfusion device.

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 discloses polymer resin for removing metal impurities in a cyanide-free electroplating cadmium solution as well as a preparation method and a use method of the polymer resin, and relates to the technical field of functional materials. The invention relates to a polymer resin for removing metal impurities in a cyanide-free electroplating cadmium solution. The polymer resin comprises a polymer matrix, cyclodextrin covalently crosslinked to the polymer matrix and a functionalized functional group for functionally modifying the polymer matrix, the functionalized functional group comprises an iminodiacetic acid group, a sulfydryl group and an amido group. According to the invention, cyclodextrin is introduced into a polymer matrix through covalent cross-linking, then three functional groups with high metal affinity are used for modification, and through the inclusion effect of cyclodextrin and the targeted collaborative design of the three functional groups, the ability of polymer resin to selectively capture metal impurities is enhanced; even in the environment of competing with EDTA, NTA and other strong chelating agents, the metal impurities can still be effectively combined and removed by breaking the competition barrier.

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.

The application discloses an industrial wastewater zero-discharge treatment process and relates to the technical field of industrial wastewater treatment. The application adopts a combined process of "air flotation+softening precipitation+catalytic oxidation+multi-medium filtration+ultrafiltration+DTRO+RO" to concentrate wastewater, and the concentrated water of the DTRO is treated through a process of "softening precipitation+multi-medium filtration+evaporation crystallization". Meanwhile, a modified monomer is generated through an imino nucleophilic acyl substitution reaction of maleic anhydride and diethyl iminodiacetate, and the modified monomer is acidified by hydrochloric acid to obtain an acidified modified monomer containing a large amount of carboxyl groups; then, the acidified modified monomer is subjected to a free radical polymerization method together with hydroxyethyl methacrylate and 2-acrylamido-2-methylpropanesulfonic acid sodium to obtain an oily copolymer; and finally, the copolymer is adsorbed by porous ceramic particles, the surface of the particles is sprayed with aluminum dihydrogen tripolyphosphate encapsulation, and a final silicon removal agent is formed.

The invention discloses a main catalyst for olefin polymerization, the main catalyst comprises a titanium-containing compound, a magnesium-containing compound, halogen and an internal electron donor, the internal electron donor is an iminodiacetate compound, and the invention also discloses a preparation method of the main catalyst. The invention also discloses a catalyst system for olefin polymerization, which comprises the main catalyst, a cocatalyst and an external electron donor, a preparation method of the catalyst system, and a method for olefin (co) polymerization by using the catalyst system. The invention also discloses an iminodiacetate compound and application of the iminodiacetate compound as an internal electron donor in an olefin polymerization catalyst.

The present invention provides a technology that suppresses the amount of chromium adsorbed onto a chelate resin during ion exchange treatment performed on an acidic solution containing scandium and chromium using the chelate resin, thereby achieving more effective adsorption of scandium.　The present invention includes an ion exchange treatment step in which an acidic solution that contains scandium and impurities including chromium is passed through a column filled with an iminodiacetic acid type chelate resin so as to cause scandium to be adsorbed onto the chelate resin. In the ion exchange treatment step, the acidic solution is passed at a temperature in the range of 15°C to 45°C. When the adsorption amount of scandium onto the chelate resin is qSc and the maximum adsorption amount of scandium onto the chelate resin is qmax, Sc, the passed amount BV of the acidic solution at which qSc / qmax, Sc = 0.5 is defined as a lower limit value, and the passed amount BV of the acidic solution at which the maximum adsorption amount of scandium onto the chelate resin, i.e., qmax, Sc, is achieved is defined as an upper limit value, and the passed amount BV of the acidic solution is set within a range between the lower limit value and the upper limit value.

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 invention discloses a zinc ion battery electrolyte for in-situ induction of a double-layer solid electrolyte interface, the electrolyte comprises a solvent and an additive, the solvent comprises a zinc sulfate solution, and the additive comprises iminodiacetic acid (IDA) and zinc trifluoromethanesulfonate Zn (OTF) 2. The invention also discloses an application of the electrolyte in a zinc ion battery. The zinc ion battery electrolyte provided by the invention can realize in-situ construction of a stable and anti-dissolution dual-function SEI on the surface of a zinc metal negative electrode, so that dendritic crystal growth, side reaction and interface failure are inhibited, the cycle life of a zinc battery is prolonged, and the safety of the zinc battery is improved.

The present invention relates to the field of building materials technology, in particular to a kind of flame retardant and water-resistant magnesium oxysulfate board and its manufacturing process. The present invention discloses the following scheme: light-burned magnesium oxide powder, magnesium sulfate heptahydrate, water, fly ash, citric acid, iminodiacetic acid type chelating resin are mixed to obtain magnesium oxysulfate mixed slurry; using hydrogen-terminated polydimethylsiloxane and 10-undecenal as raw materials, 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide is grafted after the reaction, and then isophorone diisocyanate is used for end-blocking to obtain an isocyanate-terminated silicon-containing flame retardant; the isocyanate-terminated silicon-containing flame retardant is used for modified epoxy resin, and is mixed with epoxy toughening agent and tetraethylene pentamine to prepare epoxy resin glue; glass fiber cloth is immersed in epoxy resin glue, then combined with magnesium oxysulfate mixed slurry, and solidified to obtain magnesium oxysulfate board. The magnesium oxysulfate board prepared by the present invention has high strength and good flame retardancy and water resistance.

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 application discloses a preparation method of methyl xylene phenol blue free acid, which comprises the following steps: (1) adding 2-sulfobenzoic acid cyclanth and 2, 5-dimethyl phenol into a pressure-resistant reaction container, and performing a methylation reaction under the catalysis of a proton acid, wherein the reaction temperature is 100-120 DEG C, the reaction time is 10-20 h, water is added after the reaction is completed, heating is performed to 50-70 DEG C, and the temperature is kept for 1-3 h, and then hot filtration is performed to obtain dimethyl phenol blue; (2) in a reaction container, sodium iminodiacetic acid dihydrate is heated to 40-60 DEG C under the condition of glacial acetic acid, and then cooled to room temperature and stirred, and then dimethyl phenol blue and formaldehyde solution are added, and then stirring is performed at room temperature for 1-3 h, and then heating is performed to 40-60 DEG C to react for 6-10 h, and then hot filtration is performed, and then the reaction solution is added into the first reaction solution, and then crystallization is performed, and then filtration is performed to obtain methyl xylene phenol blue free acid. The application has the advantages of simple operation, convenient source, high product purity and good application prospect.

The present invention discloses a method for treating organic wastewater, comprising soaking zero-valent iron in a solution containing a modifier, then filtering to obtain the modified zero-valent iron, and then adding the modified zero-valent iron and hydrogen peroxide to the organic wastewater. The modifier comprises one or more of ethylenediaminetetraacetic acid, ethylenediaminetetraacetate, butanetetracarboxylic acid, butanetetracarboxylic acid salt, methyliminodiacetic acid, methyliminodiacetic acid salt, nitrilotriacetic acid, and nitrilotriacetate. The present invention uses the modifier to modify the zero-valent iron. The modified zero-valent iron can synergistically remove organic pollutants from wastewater with hydrogen peroxide under near-neutral conditions, greatly broadening the application range of the zero-valent iron and hydrogen peroxide system. The treatment method of the present invention produces almost no secondary pollution, and compared to traditional zero-valent iron and hydrogen peroxide systems, both the removal rate and removal efficiency are improved.

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 preparation method and application of polyacrylic acid chelating resin for deep defluorination, belongs to the field of water treatment materials, and particularly relates to a polyacrylic acid resin adsorbent with an amino carboxylic acid chelating functional group and a metal coordination center. The structure of the resin is as shown in the figure. The target of deep defluorination is achieved by loading metal cations such as Al < 3 + >, Fe < 3 + >, Zr < 4 + >, La < 3 + >, Ce < 3 + > and Ce < 4 + >. The polyacrylic acid chelating resin provided by the invention is suitable for a deep defluorination process of high-salt or high-organic-matter-concentration wastewater, especially for treatment of fluorine-containing industrial wastewater (such as semiconductor cleaning wastewater and photovoltaic pickling wastewater). Compared with the traditional iminodiacetic acid chelate resin, the polyacrylic acid chelate resin provided by the invention has good hydrophilicity, better dynamic performance and stronger organic matter interference resistance, and can effectively reduce the operation cost of an adsorption process and improve the wastewater treatment efficiency.

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 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.