499 results about "Iminodiacetic acid" patented technology

Generally, the present invention relates to improvements in metal utilization in supported, metal-containing catalysts. For example, the present invention relates to methods for directing and/or controlling metal deposition onto surfaces of porous substrates. The present invention also relates to methods for preparing catalysts in which a first metal is deposited onto a support (e.g., a porous carbon support) to provide one or more regions of a first metal at the surface of the support, and a second metal is deposited at the surface of the one or more regions of the first metal. Generally, the electropositivity of the first metal (e.g., copper or iron) is greater than the electropositivity of the second metal (e.g., a noble metal such as platinum) and the second metal is deposited at the surface of the one or more regions of the first metal by displacement of the first metal. The present invention further relates to treated substrates, catalyst precursor structures and catalysts prepared by these methods. The invention further relates to use of catalysts prepared as detailed herein in catalytic oxidation reactions, such as oxidation of a substrate selected from the group consisting of N-(phosphonomethyl)iminodiacetic acid or a salt thereof, formaldehyde, and/or formic acid.

An activated carbon having a high catalytic activity as an oxidation catalyst or a decomposition catalyst, and use therefor are provided.

The activated carbon has (a) an oxygen content in a range from 1.40 to 4.30% by mass, (b) a nitrogen content in a range from 0.90 to 2.30% by mass, (c) a sulfur content in a range from 0.50 to 1.20% by mass, and (d) a hydrogen content in a range from 0.40 to 0.65% by mass. The activated carbon may have at least one characteristic of (e) an amount of an acidic surface functional group of 0.10 to 0.36 meq/g, (f) an amount of a basic surface functional group of 0.50 to 1.30 meq/g, and (g) a benzene adsorption capacity of 25 to 50%. The activated carbon catalyzes an oxidation reaction of N-(phosphonomethyl) iminodiacetic acid with a peroxide (e.g., hydrogen peroxide) and achieves an efficient production of N-(phosphonomethyl)glycine even after repetitive use. The activated carbon also efficiently decomposes a chloramine.

This invention relates to the use of a supplemental promoter in conjunction with a noble-metal-containing catalyst comprising a carbon support in catalyzing liquid phase oxidation reactions.

In a particularly preferred embodiment, a supplemental promoter (most preferably bismuth or tellurium) is used in conjunction with a noble-metal-containing catalyst comprising a carbon support in a liquid phase oxidation process wherein N-(phosphonomethyl) iminodiacetic acid (i.e., “PMIDA”) or a salt thereof is oxidized to form N-(phosphonomethyl)glycine (i.e., “glyphosate”) or a salt thereof. The benefits of such a process include oxidation of the formaldehyde and formic acid by-products, and, consequently, decreased final concentrations of those by-products as well as other undesirable by-products, most notably N-methyl-N-(phosphonomethyl)glycine (i.e., “NMG”).

The invention provides a method for treating glyphosate mother liquor by an oxidation method, which comprises the following steps: firstly, using regulating agents for regulating the pH value of the glyphosate mother liquor with organic phosphor or glyphosate or nitrogenous compounds or salt to 0.1 to 14; then, carrying out the pressurized oxidation reaction with strong oxidizing gas under the condition of the existence of catalysts; oxidizing phosphorus-containing impurities such as glyphosate, glyphosine, orthophosphorous acid, methyl glyphosate, aminomethyl phosphonic acid, N-(Phosphonomethyl) iminodiacetic acid and the like into phosphate radical ions; oxidizing nitrogenous organic impurities such as glycin, triethylene ammonia, diethanolameine, aminomethyl phosphonic acid, hydroxyethyl glycine and the like into ammonia radical ions; and then, carrying out concentration and separation to obtain phosphate and amine salt inorganic compounds for recovery and reuse. The invention can effectively oxidize the complicated organic phosphor and the nitrogenous compounds in the glyphosate mother liquor into single phosphate radicals and amine salt inorganic compounds for convenient recovery and reuse, and can simultaneously reduce the environment pollution and the soil hardening caused by the mother liquor. Thereby, the total conversion rate of the phosphorus-containing compounds reaches 60 to 90 percent, the conversion rate of the nitrogenous compounds reaches more than 90 percent, in addition, the removal rate of the glyphosate reaches 95 to 99 percent, a large amount of produced phosphate and amine salt can be used for agricultural fertilizers, and the goal of changing waste materials into valuable materials is achieved.

The invention provides a battery separator comprising a porous resin film and a crosslinked polymer supported thereon and having iminodiacetic acid groups in side chains of the polymer chains. The iminodiacetic acid group is preferably represented by the formula

wherein M¹ and M² are each independently a hydrogen atom, a lithium atom, a potassium atom, a sodium atom, or triethylamine. It is preferred that the layer of the crosslinked polymer is substantially nonporous or solid, and ion conductive, and that the crosslinked polymer has in the molecule oxetanyl groups which are capable of cation polymerization.

The invention provides a method for preparing iminodiacetic acid by catalyzing iminodiacetonitrile with microbes, which comprises the following steps: using bacterial strains which produce nitrilase to obtain the nitrilase through enzyme production cultivation; and taking the nitrilase as a biological catalyst to biologically catalyze the iminodiacetonitrile to prepare the iminodiacetic acid. The invention also relates to a screening method of the microbes which produce the nitrilase and the bacterial strains with nitrilase activity obtained by the screening method. The invention provides the basis for producing the iminodiacetic acid by biologically catalyzing the iminodiacetonitrile, thereby having important application prospect.

The invention relates to an environmental-friendly new method for preparing N-phosphonomethyl iminodiacetic acid by utilizing acrylonitrile byproduct hydrocyanic acid, belonging to the comprehensive utilization of acrylonitrile device byproduct hydrocyanic acid in industrial scale. The method includes that: step first, acrylonitrile byproduct hydrocyanic acid is used for preparing hydroxyl acetonitrile, and then iminodiacetonitrile is prepared; step two, the obtained iminodiacetonitrile is used for preparing iminodiacetic acid by acid hydrolysis method; and step three, the obtained iminodiacetic acid is used for preparing N-phosphonomethyl iminodiacetic acid. No report of preparing PMIDA by utilizing acrylonitrile byproduct hydrocyanic acid in industrial scale is seen, and the inventor uses local materials, utilizes the advantages of being adjacent to Qilu petrochemical and having resource of hydrocyanic acid (4000 ton/year) transmitted by pipeline and initially provides the method for preparing PMIDA by utilizing acrylonitrile byproduct hydrocyanic acid in industrial scale. The invention solves the problem of region restriction of product production caused by inconvenient transportation of hydrocyanic acid. A gas and liquor mixer is applied to iminodiacetonitrile reaction, and by virtue of DCS control system, quality and yield of iminodiacetonitrile are improved.

A polishing composition includes fumed alumina, alumina other than fumed alumina, colloidal silica, a first organic acid, a second organic acid, an oxidizing agent, and water. When the second organic acid is citric acid, the first organic acid is preferably malic acid, while when the second organic acid is malic acid, the first organic acid is preferably citric acid. When the second organic acid is succinic acid, iminodiacetic acid, itaconic acid, maleic acid, malonic acid, crotonic acid, gluconic acid, glycolic acid, lactic acid, or mandelic acid, the first organic acid is preferably either citric acid or malic acid. The polishing composition can be suitably used for polishing the surface of a substrate for a magnetic disk.

The invention provides a method for determining apolipoprotein A2 by using an immunity transmission turbidimetric method, and a kit composed of applied reagents. The reagents applied by the method comprises one or more stabilizing agent selected from substances of: glycol(alpha-amino ethyl)ether tetraacetic acid, iminodiacetic acid, sodium polyoxyethylene fatty alcohol ether sulfate (AES), 1,2-cylohexanediol diglycidol, sodium diethylene triamine pentacetate, and hexapolyglycerol dioleates; and one or more high-molecular accelerating agents selected from substances of: fatty alcohol polyoxyethylene ether, polyvinylpyrrolidone, glycol polyoxylethylene ether, hydroxypropyl methylcellulose, carboxymethyl cellulose, and sodium polyacrylate. The method provided by the invention can be used in batch detection and analysis. The method and the kit have high anti-interference capabilities against high fat, jaundice and hemolysis samples.

The invention discloses a secondary battery negative electrode material which comprises a framework, a chelation/adsorption radical and an active substance, wherein the framework does not participate in electrochemical reaction, and only provides a carrier for the chelation/adsorption radical; the chelation/adsorption radical comprises outer electrodes of atoms of N, S, P, O and the like, and can form a chelated/chemical adsorption bond (represented by an iminodiacetic acid chelated radical in figure) with two-valent and polyvalent metals; the active substance can be two-valent and polyvalent metal ions which can be reduced into relatively low valent. During charging, the metal ions which are taken as the active substance is reduced into a relatively-low-valent state or a metal elemental state; during discharging, the metal ions are reversely generated and form chelated/chemical adsorption bonds with the chelation/adsorption radical. The negative electrode material can be matched with a plurality of positive electrode materials to form a battery. The battery negative electrode disclosed by the invention is novel in principle and structure, expected to be applied to electric vehicles and large-scale energy storage projects due to low price and reliability.

The invention belongs to the technical field of environment protection and relates to a refining process method of by-product salt on a production line of glyphosate. The method is specifically applied to the treatment of waste water of glycine glyphosate mother liquor and treatment of by-product salt in the industries of PMIDA mother liquor, iminodiacetic acid mother liquor, trimethyl phosphate mother liquor and chlor-alkali; due to the fact that the solid waste salt on the production process line of glyphosate contains a large amount of organic matters, the solid waste salt can not be applied but serve as industrial waste salt. By means of the process method, most organic matters in the solid salt can be removed, the purpose of purifying the solid salt is achieved, the purified solid salt or refined saline water can be used for other industries such as chlor-alkali production and caustic soda production, the resource utilization of the waste is achieved, and great economic benefit and social benefit are achieved.

The invention relates to a treatment process of glyphosate mother liquor, comprising the following steps: step 1. glyphosate mother liquor is the remaining mother liquor extracted after the glyphosate technical is crystallized and separated out in the process of preparing glyphosate by iminodiacetic acid method; step 2. the mother liquor is pretreated by ultra-filtration to cause the pollution index of the mother liquor to be less than or equal to 5; step 3. strong liquor (1) with concentration of 2%-7% and light liquor (1) with concentration of 0%-0.1% are obtained from the mother liquor by a first order membrane separation and are respectively collected in storage tanks, strong liquor (2) with concentration of 5%-15% and light liquor (2) with concentration of 0.1%-0.2% are obtained fromthe strong liquor (1) by a second order membrane separation and are respectively collected in storage tanks; step 4. the strong liquor (2) is cooled to negative 10 DEG C to 25 DEG C for crystallizingand separating to obtain glyphosate bulk drug and filtrate, the filtrate is used indiscriminately for 1-20 times, the light liquor (2) returns to the first order membrane for separation; step 5. the light liquor (1) in step 3 is fed with ammonia until pH is equal to 8-11 and generates urotropine, urotropine solution with the mass percentage of 5%-40% and light liquor (2) with the pH of 7-11 are obtained after a third order and a fourth order membrane separation; and step 6. after the filtrate in the step (4) is used indiscriminately for 1-20 times, the remaining filtrate is added with water according to the proportion of 1:0.5-5 to remove formaldehyde, glyphosate filtrate with the content of formaldehyde less than or equal to 0.30% is obtained and is used for preparing gyphosate solution.

The invention provides a nitrilase gene coding nitrilase, a recombinant vector containing the gene, a recombinant gene engineering bacteria obtained by converting the recombinant vector and application thereof in preparing recombinant nitrilase. The nitrilase gene can be connected with an expression vector for construction to obtain endoenzyme expression recombinant plasmid containing the gene or secretion expression recombinant plasmid, and then the endoenzyme expression recombinant plasmid containing the gene or the secretion expression recombinant plasmid is respectively and correspondingly converted to a colibacillus bacterial strain to obtain recombinant colibacillus; the recombinant colibacillus contains recombinant nitrilase and can recombine colibacillus into an enzyme resource for biological catalysis and conversion. The recombinant nitrilase serves as the enzyme for conversion, and racemisation mandelonitrile, acrylonitrile, iminodiacetonitrile or 2,2-dimethylcyclopropane carbonitrile and the like serve as a substrate for converting to react and prepare corresponding R-mandelic acid, crylic acid, iminodiacetic acid or chiral 2,2-dimethylcyclopropane formic acid and the like.

The invention belongs to the technical field of nano functional materials, and particularly relates to a core-shell type magnetic composite microsphere for the separation and purification of recombinant proteins and a preparation method thereof. A core of the core-shell type magnetic composite microsphere disclosed by the invention is a magnetic ferroferric oxide nano particle cluster, and a shell of the core-shell type magnetic composite microsphere is a crosslinked polymer network containing epoxy groups. The core-shell type magnetic composite microsphere is prepared through the following method implemented through the steps that: a magnetic nano particle cluster with stable sodium citrate is prepared firstly; then, by using a sol gel method, an active vinyl functional group is modified on the surface of the magnetic cluster; a high-magnetic-responsiveness monodispersed core-shell type magnetic composite microsphere of which the surface is rich in epoxy groups is prepared through distilling-precipitation polymerization; an iminodiacetic acid is adopted for carrying out ring-opening reaction with the epoxy groups and complexing nickel ions; finally, histidine marked proteins are separated and purified. The preparation method of the core-shell type magnetic composite microsphere is simple, controllable in process, and high in efficiency of separation and purification of recombinant proteins. According to the method disclosed by the invention, the thickness and crosslinking degree of a polymer shell layer and the density of surface functional groups can be precisely controlled, therefore, the method has a good application prospect.

The invention discloses a preparation method of modified activated carbon used for heavy metal wastewater treatment. The preparation method comprises the steps that firstly, activated carbon is washed, dried, ground, sieved and soaked, so that pores of the activated carbon are filled with water; secondly, clean air is blown so that the activated carbon can be in a boiling state, and an oxidizing agent is sprayed for controllable oxidation; thirdly, N-(2,3-glycidyl) iminodiacetic acid disodium allows iminodiacetic acid disodium to be connected to the surface of the activated carbon through epoxy group ring opening. According to the prepared modified activated carbon, hydroxyls, carboxyls and iminodiacetic acid groups having a strong effect on heavy metal ions are introduced only on the surface, the original hole channel structure feature of the activated carbon is maintained, the capacities of strong heavy metal adsorption and organic pollutant removal are both achieved, and the dual purposes of removing heavy metal and organic pollution can be achieved by one step through adsorption via activated carbon. Meanwhile, the adsorbed heavy metal is easy to recycle, the activated carbon is easy to regenerate, the cycle service life of the activated carbon is long, no secondary pollution will occur, and therefore the preparation method has good application and popularization prospects.

The invention discloses a method for preparing glyphosate by taking active carbon as a catalyst and oxidizing N-(phosphonomethyl)iminodiacetic acid with oxygen. The method comprises the following steps: taking the active carbon which is made from coal, coconut shell and wood and has specific surface area of 800-1200m/g as the catalyst; oxidizing the N-(phosphonomethyl)iminodiacetic acid in the presence of the oxygen to prepare the glyphosate with reaction selectivity of 98% and 99% conversion of the N-(phosphonomethyl)iminodiacetic acid and solid glyphosate yield of 98.61-97.12% while producing a small amount of formaldehyde gas during the reaction; filtering after the reaction is over and then recovering the active carbon catalyst for indiscriminate use; supplementing 5% of the active carbon for each batch, wherein, the activity of the catalyst does not reduce after the oxidization reaction is repeated for 20 batches. The recovered catalyst and water can be repetitively used indiscriminately and recovered after the reaction without waste gas, waste water and waste residue. The method has the advantages of low material cost and convenient use.

This invention discloses a method for preparing N-phosphonomethyl iminodiacetic acid (PMIDA) by iminodiacetonitrile hydrolysis. The method comprises: (1) hydrolyzing iminodiacetonitrile (greater than or equal to 95 wt.%) in an alkali solution under stirring at 20-100 deg.C and -(0.01-0.04) MPa to obtain iminodiacetate solution; (2) dropping phosphorous trichloride (1.0-1.5 mol times of iminodiacetonitrile) to the iminodiacetate solution at 20-100 deg.C and -(0.01-0.04) MPa with an acidic catalyst added before or after the phosphorous trichloride addition; (3) adding formaldehyde at a temperature not lower than 80 deg.C; (4) reacting at 100-120 deg.C for 1-7 h to obtain PMIDA suspension; (5) vacuum-distilling to recover formaldehyde; (6) crystallizing, separating, washing and drying to obtain PMIDA with a purity higher than 98%. The method has such advantages as simple process, low cost and high yield.