245 results about "Imidodiacetic acid" patented technology

A method of cleaning a wellbore prior to the production of oil or gas is disclosed, wherein the wellbore has been drilled with an invert emulsion drilling mud that forms an invert emulsion filter cake. The method may include the steps of circulating a breaker fluid into the wellbore, where the breaker fluid includes an aqueous fluid, and imino diacetic acid or salt thereof. Optionally an acid buffering agent, and a weighting age are also included. The breaker fluid is formulated such that after a predetermined period of time and the filter cake present in the wellbore or on the wellbore face is substantially degraded. Other methods may also include drilling the wellbore with a water-based drilling mud that forms a water-based filter cake, wherein the method may include the steps of circulating a breaker fluid into the wellbore, where the breaker fluid may include an aqueous fluid, and an iminodiacetic acid or a salt thereof.

The invention relates to a process for comprehensively treating a mother liquor containing sodium chloride, obtained by the synthesis of an IDA line n-(phosphonomethyl)iminodiacetic acid. The treated sodium chloride meet the quality requirement for producing caustic soda by electrolysis, in particular, the concrete treatment steps comprises: an n-(phosphonomethyl)iminodiacetic acid, an n-(phosphonomethyl)iminodiacetic acid homolog and a dense liquid richly concentrated on the inner side of the film of the sodium filtration film condensed mother liquor are used to recover the n-(phosphonomethyl)iminodiacetic acid, and coarse sodium chloride is obtained by the dehydration crystallization of a weak liquor; the coarse sodium chloride is treated to obtain refined sodium chloride which can be directly used for producing caustic soda by electrolysis. By the comprehensive treatment method of the invention, the n-(phosphonomethyl)iminodiacetic acid of the n-(phosphonomethyl)iminodiacetic acid mother liquor can be effectively recovered, the by-product sodium chloride in the waste water can be fully utilized, thereby thoroughly meeting the requirements on economy, energy conservation and environmental protection.

This invention generally relates to processes for recovering solubilized noble metals from aqueous process streams, in particular, aqueous process streams generated in the preparation of an N-(phosphonomethyl)glycine product, for example, by noble metal-catalyzed oxidation of an N-(phosphonomethyl)iminodiacetic acid substrate. The process includes contacting the aqueous process stream with a noble metal adsorption media such as an ion exchange resin to remove solubilized noble metal from the process stream.

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.

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.

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.

Compositions and processes for producing compositions for removing conductive material, such as copper or copper alloys, from a substrate with reduced dishing and reduced insensitivity to overpolishing are provided. Embodiments include polishing compositions for electrochemical mechanical polishing of a substrate surface comprising a conductive material, the compositions having a pH of between about 3.0 to about 9.0, such as between about 4.0 to about 7.0, for example between about 5.0 to about 6.5. The polishing compositions comprise one or more inorganic based electrolytes, such as potassium phosphate monobasic, one or more chelating agents, such as citric acid, imidodiacetic acid, glycine, or salts thereof, such as ammonium citrate, one or more corrosion inhibitors, such as benzotriazole, a basic pH adjusting agent, such as ammonium hydroxide, potassium hydroxide or combinations thereof, one or more oxidizers, such as hydrogen peroxide or ammonium persulphate (APS), and a solvent, such as deionized water.

The invention discloses an environmentally-friendly clean production method of iminodiacetic acid. According to the method, the iminodiacetic acid product is prepared from iminodiacetonitrile serving as the starting raw material through the steps of performing sulfuric acid hydrolysis, performing ammonia or ammonia water neutralization, decoloring, recrystallizing and the like; ammonium sulfate is separated out by decoloring, concentrating and crystallizing mother liquid; and condensate water and the mother liquid are recycled and applied to the next time of sulfuric acid dilution. By adopting the method, a large amount of sodium sulfate generated by alkaline hydrolysis is avoided, and corrosion to equipment and pollution to operation environment caused by hydrochloric acid hydrolysis are avoided; the reaction mother liquid can be completely reused and the iminodiacetic acid which the mother liquid contains can be completely recycled, so the yield is increased, water consumption is greatly reduced, no emission of waste liquid is realized, and the method is a completely environmentally-friendly clean process; and in addition, after the iminodiacetic acid and the mother liquid are decolored by active carbon, accumulation of colored impurities is greatly reduced and the product quality is high.

The invention relates to a method for treating glyphosate waste water and reducing the emission of carbon dioxide. The glyphosate waste water is obtained by extracting glyphosate after the N-phosphonomethyliminodiacetic acid is oxidized in the process of preparing the glyphosate by using an iminodiacetic acid method. Urotropine finished products are prepared by the following steps: (1) adding alkali into the glyphosate waste water, and adjusting and controlling the pH value to between 3 and 5 to obtain corresponding formate solution; (2) performing condensing separation on the solution of the step (1) by a film integration method to obtain 5 to 25 percent formate solution and 0.5 to 5 percent obenzaldehyde water solution (1); (3) performing evaporating, dehydration and solid-liquid separation on the formate solution of the step (2) to obtain formate wet powder and 0.5 to 5 percent benzaldehyde water solution (2), and drying the formate wet powder to obtain the finished product; (4) adding ammonia accounting for 1.5 to 3 percent the benzaldehyde water solution (1) and the benzaldehyde water solution (2) to obtain 0.3 to 4 percent urotropine water solution, and improving the concentration of the urotropine to between 10 and 25 percent by film separation; and (5) evaporating, separating and drying the urotropine solution to obtain the urotropine finished product.

The invention relates to a wastewater treatment process, in particular to a method for treating N-(phosphonomethyl)iminodiacetic acid wastewater by a coupling catalytic oxidation technology. The method comprises the following concrete steps of: adding catalytic oxidizers of sodium nitrite and sodium hypochlorite into the N-(phosphonomethyl)iminodiacetic acid wastewater in a mixing tank, filtering after stirring evenly, putting the wastewater into a multi-effect evaporation device, concentrating under the conditions that the temperature is 65-100 DEG C and the vacuum degree is from -0.05MPa to -0.09MPa and crystallizing a concentrate under the condition that the COD concentration of effluent water is below 5000mg/L to precipitate sodium chloride which can reach the standard of industrial salt. The invention has simple and convenient operation, strong controllability, simple equipment, cost reduction, less energy consumption and no secondary pollution; the invention is suitable for treating and reclaiming the N-(phosphonomethyl)iminodiacetic acid wastewater.

The invention relates to a preparation method and application of a macroporous chitosan-polyvinyl alcohol crosslinking affinity membrane chelated with metal ions. The preparation method of the membrane comprises the steps that chitosan, polyvinyl alcohol and silica gel are mixed to prepare a chitosan-polyvinyl alcohol membrane; processing and pore forming are performed with a sodium hydroxide solution; the chitosan-polyvinyl alcohol membrane is added in epoxy chloropropane and sodium hydroxide to obtain a macroporous chitosan-polyvinyl alcohol crosslinking membrane of a net structure; the macroporous chitosan-polyvinyl alcohol crosslinking membrane is steeped in a sodium carbonate solution containing iminodiacetic acid; the dried membrane is steeped in a solution containing divalent metal ions, and then the macroporous chitosan-polyvinyl alcohol crosslinking affinity membrane chelated with the metal ions is obtained. The macroporous chitosan-polyvinyl alcohol crosslinking affinity membrane chelated with the metal ions has the higher mechanical strength and has the efficient affinity adsorption capacity on protein containing histidine; the macroporous chitosan-polyvinyl alcohol crosslinking affinity membrane chelated with the metal ions is applied to separation of protein or enzymes containing the histidine, and the separation method comprises the steps of crude enzyme fluid preparation, specificity affinity adsorption of the membrane on the protein or enzymes containing the histidine, adsorption protein elution and membrane regeneration.

The invention discloses a method for reclaiming diglycolamidic acid from acidified mother liquor of diglycolamidic acid, which comprises charging calcium salts into iminodiacetic acid acidulation mother liquid, wherein the mole ration of the iminodiacetic acid and the calcium salts is 1:1.0-1:1.8, adjusting and controlling pH between the range of 10.0-11.67, carrying out complex reaction at the temperature of 70-90 deg. C, filtering the reaction solution, obtaining iminodiacetic acid calcium and charging hydrochloric acid, so as to obtain iminodiacetic acid, finally cooling down for crystallization. The mol ratio of iminodiacetic acid calcium and HCL is 1:2-1:5.

The invention discloses auto cooling fluid, comprising the following raw materials in parts: 10-18 parts of diethylene glycol, 11-14 parts of oxalic acid, 13-15 parts of 1,2-propylene glycol, 12-15 parts of ethylene glycol ethyl ether acetate, 8-12 parts of triethyl phosphonoacetate, 8-12 parts of glufosinate-ammonium, 5-8 parts of N-(phosphonomethyl)iminodiacetic acid, 6-8 parts of styrene-acrylic-triazole, 6-7 parts of 1-hydroxybenzotriazole, 6-9 parts of benzotriazole, 2-3 parts of dimeticone, 1-3 parts of hydroxyl silicone oil, 3-4 parts of a dimethyl silicone polymer, 3-5 parts of butanol, 1-3 parts of sodium hydroxide, 2-3 parts of sodium peroxide, 2-4 parts of potassium chlorate, 1-3 parts of silver carbonate, 2-5 parts of silver phosphate and 150-160 parts of purified water. The auto cooling fluid has good stability, the microbial flora can be inhibited and killed, floccules, flotage, sediments and the like are prevented, effective circulation of the cooling liquid is ensured, the fault of a cooling liquid circulating system is relieved and prevented, the anti-corrosion effect is good, corrosion to the cooling liquid circulation system can be reduced and delayed, the fault of the cooling liquid circulating system is reduced, and the service life of the auto cooling liquid is prolonged.

This invention discloses a method for oxidizing N-(carboxymethyl)-N-(phosphonomethyl)-glycine into glyphosate with air or oxygen as the oxidant under the catalysis of activated carbon or carbon nanotubes and ultrasonic wave. The method has such advantages as high yield, high reaction selectivity, high product purity, no need for expensive catalyst or reductant, and no need for H2O2.