7 results about "EDTMP" patented technology

The invention discloses a fracturing imbibition system for refracturing a low-permeability tight oil reservoir and a preparation method of the fracturing imbibition system, and belongs to the technical field of fracturing fluids, the fracturing imbibition system comprises: an acid liquid base fluid: hydrochloric acid, hydrofluoric acid, EDTMPS and deionized water; an amphoteric betaine viscoelastic surfactant; biologically modifying the nanoparticles; a Gemini cationic surface active agent; a corrosion inhibitor; and an organic silicon defoaming agent and a fluorocarbon discharge aiding agent. According to the fracturing imbibition system, through the integrated design of the multifunctional surfactant, the problems that a traditional acid fracturing fluid is insufficient in silicate mineral dissolving capacity, high-temperature viscosity is attenuated, and corrosion inhibitor dependence is caused are solved.

The invention discloses a cleaning method and a cleaning agent for reverse osmosis (RO) membrane silicon pollution, and particularly relates to the technical field of reverse osmosis membranes, the cleaning agent comprises the following components by weight: 2%-5% of ethylenediamine tetramethylenephosphonic acid, 0.5%-2% of fatty alcohol polyoxyethylene ether sodium sulfate, 0.8%-2.0% of isopropanol and the balance of water. Through the ternary synergistic effect of the EDTMP, the AES and the isopropanol, the three-stage pH gradient cleaning process and the Fe < 2 + > alkaline catalytic oxidation technology are matched, stubborn polymeric silicon scale is efficiently decomposed, secondary adsorption of the silicon scale is avoided, the problem of low traditional cleaning efficiency is thoroughly solved, meanwhile, the membrane damage rate after cleaning is extremely low, and the service life of the membrane is prolonged. The flux recovery rate of 95% or above can be achieved for roll type, disc tube type and other common industrial RO membranes, the cost is greatly reduced, the pH stability is high when the cleaning agent is recycled, the performance can be recovered only by supplementing a small amount of Fe < 2 + >, agent consumption and waste generation are reduced, and the cleaning agent has high biodegradability, low equipment corrosion, low wastewater COD value and is more environmentally friendly.

The present invention addresses the problem of providing: an electrolytic capacitor that is capable of suppressing leakage current in an aqueous electrolyte containing a comparatively large amount of a phosphoric acid ion source, and that is capable of having an extended life; and a production method for the same. Provided as a solution is an electrolytic capacitor (1) comprising: a capacitor element (2) that has a positive electrode foil (8) on which a dielectric layer is formed, a negative electrode foil (9), and a separator (10) which is provided between the positive electrode foil (8) and the negative electrode foil (9); and an electrolyte (3) that is impregnated in the capacitor element (2), wherein the electrolyte (3) contains a water-containing solvent, a phosphoric acid ion source, and a phosphonic-acid-based chelating agent (excluding ethylenediamine tetra(methylene phosphonic acid) (EDTMP), ethylenediamine tetrakis(methylene phosphonic acid) (EDTPO), ethylenediamine-N,N'-bis(methylene phosphonic acid), and substances having chemical structures identical to these), and the water content in the electrolyte (3) is not less than 40 mass%.

The invention discloses a curcumin extraction and purification method based on an aminophosphonic acid complexing agent, and belongs to the technical field of natural product extraction. According to the method, ethylenediamine tetramethylenephosphonic acid (EDTMP) or amino trimethylene phosphonic acid (ATMP) is taken as a complexing agent, and efficient extraction and accurate purification of curcumin are realized by virtue of a five-step process of raw material pretreatment, complexation reaction, complex separation, complex dissociation and refining purification and by virtue of specific binding and gradient pH regulation of the complexing agent on curcumin. The extraction rate reaches 92% or above, the product purity is larger than or equal to 98.5%, the total content of heavy metal is smaller than or equal to 0.1 mg / kg, and no toxic solvent is left; meanwhile, the process is simple and convenient, the cost is low, the complexing agent can be recycled, and the method is suitable for large-scale production, can be widely applied to preparation of high-purity curcumin in the fields of food and medicine, and has extremely high industrialization value.

The invention relates to the field of oil and gas exploitation, in particular to a corrosion inhibitor for carbon dioxide corrosion and a preparation method thereof. The corrosion inhibitor for carbon dioxide corrosion comprises the following components: foots, sodium hydroxide, a paper pulp by-product, sulfuric acid, m-phenylenediamine, rosin amine, diethylenetriamine and EDTMP, and the paper pulp by-product is a by-product obtained by using wood as a raw material and preparing paper pulp through a sulfate method. The corrosion inhibitor for carbon dioxide corrosion not only is low in cost, but also is low in corrosion rate.

The invention discloses a slag-free high-temperature manganese phosphating solution as well as a preparation method and application thereof. The slag-free high-temperature manganese phosphating solution comprises the following components in percentage by weight: 22.0%-30.5% of phosphoric acid, 3.0%-8.5% of manganous dihydrogen phosphate, 3.5%-8.0% of manganese carbonate, 4.0%-7.0% of nitric acid, 2.0%-5.0% of nickel nitrate, 0.2%-1.5% of nickel carbonate, 0.2%-1.0% of potassium pyrophosphate, 0.2%-1.0% of tartaric acid, 0.2%-1.0% of EDTA (Ethylene Diamine Tetraacetic Acid), 0.2%-1.0% of sodium citrate, 0.2%-1.0% of EDTMP (Ethylene Diamine Tetraacetic Acid) and the balance of pure water. The phosphating solution has the beneficial effects that a uniform and wear-resistant manganese phosphating film can be formed on the surface of a workpiece, the phosphating solution adopts a specific complexing agent combination, the generation of phosphated residues is reduced, the solution system proportion is adjusted, the influence of the complexing agent on the color of a film layer can be counteracted, the blackness of the original film layer is maintained, and the product quality is improved. Meanwhile, when the phosphating solution is applied, an iron ion concentration monitoring mechanism is established, real-time detection is performed through chemical titration or instrumental analysis, and a deslagging agent is added for centralized treatment when iron ions reach an upper limit value. The problem of surface defects caused by the fact that phosphated residues are attached to workpieces is solved.

This invention provides a phosphorus-containing wastewater treatment agent, comprising, by weight: 3-10 parts sodium polyphosphate, 0.1-1 parts alkylepoxycarboxylic acid, 5-10 parts ethylenediaminetetraacetic acid, 3-10 parts EDTMPS, 0.1-3 parts polyacrylamide, 5-15 parts iron(III) oxide, 10-30 parts polyaluminum chloride, 10-30 parts modified bentonite, and 0.5-5 parts aminated carbon nanotubes. The preparation method includes the following steps: adding magnetic iron(III) oxide nanoparticles to a polyaluminum chloride solution to obtain a precipitating composite agent; dissolving chitosan in acetic acid solution and adding sodium-based bentonite to obtain modified bentonite; adding water to the remaining materials and mixing well; adding aminated carbon nanotubes and the precipitating composite agent in portions; adding modified bentonite and mixing well to obtain a premix; treating the premix to obtain the product. This product can efficiently and stably adsorb suspended particles and phosphates in water, accelerate the floc settling rate, and enhance phosphorus removal efficiency.