256 results about "Potassium formate" patented technology

Compositions and methods are provided for reducing the permeability of subterranean zones. More particularly, water-soluble polymeric compositions which form cross-linked gels in the zones. In general, the composition comprises (a) at least one water-soluble polymer; (b) at least one organic gelling agent capable of cross-linking the water-soluble polymer; and (c) at least one water-soluble formate. More preferably, the water-soluble polymer is a copolymer of (i) at least one non-acidic ethylenically unsaturated polar monomer, and (ii) at least one copolymerisable ethylenically unsaturated ester. The gelling agent is preferably selected from the group consisting of a polyalkyleneimine, polyfunctional aliphatic amine, an aralkylamine, and a heteroaralkylamine. The preferred water-soluble formate is selected from the group consisting of ammonium formate, lithium formate, sodium formate, potassium formate, rubidium formate, cesium formate, and francium formate. Water is used to make an aqueous composition prior to use in a subterranean formation. The methods of this invention for reducing the permeability of a subterranean zone are comprised of the steps of introducing an aqueous composition according to the invention into a subterranean zone, and then allowing the aqueous composition to form a cross-linked gel in the zone. Preferably, the method includes the step of subsequently producing hydrocarbons from the subterranean formation.

The invention relates to a high-density multielement compound saltwater drilling fluid applicable to compound salt bed drilling. The high-density multielement compound saltwater drilling fluid comprises the following components in parts by weight: 100 parts of water, 15-50 parts of multielement compound salt, 1-15 parts of plugging agent, 2-8.2 parts of fluid loss additive, 0.1-0.6 part of pH regulating agent, 1-10 parts of lubricant and 1-270 parts of weighting agent. The multielement compound salt is a mixture of three or more than three of sodium chloride, potassium chloride, calcium chloride, sodium formate, potassium formate, cesium formate and sodium silicate. Due to the synergetic effect of the multielement compound salt and the plugging agent, the drilling fluid can be used for effectively sealing a well wall, meanwhile has favorable microcrack sealing capability, is capable of retarding drilling fluid filtrate transfer, has strong capability of retraining the dissolution of rock salt and gypsum and the expansion of evaporite and mud stock, and can be used for enhancing the well wall stability of an evaporite mud compound salt bed. When the density is up to 2.35g/cm<3>, the drilling fluid still has favorable rheological property and lubricating property, and can meet the requirements of straight well and directional well drilling of an evaporite bed.

The invention discloses an alkaline fertilizer composed of the following components in percentage by weight: 31-99.4% of macroelements, 0.5-50% of medium elements, 0.1-15% of microelements and 0-50% of synergic components, wherein the macroelements include two and even more selected from urea, diammonium phosphate, ammonium polyphosphate, dipotassium phosphate, tripotassium phosphate, potassium pyrophosphate, potassium tripolyphosphate, potassium nitrate, potassium carbonate, potassium sulfate, potassium chloride, potassium formate, potassium silicate and potassium hydroxide; the medium elements are one or more selected from calcium nitrate, calcium chloride, magnesium chloride, magnesium sulfate, EDTA calcium and EDTA magnesium; the microelements are one or more selected from ferrous sulfate, zinc sulfate, manganese sulfate, copper sulfate or an EDTA chelate of iron, zinc, manganese and copper, EDDHA iron, borax, disodium octaborate tetrahydrate and sodium molybdate; and the synergic components include one or more selected from sodium humate, potassium humate, sodium fulvate, potassium fulvate, sodium alginate, potassium alginate and a plant growth regulator.

The invention discloses a high-concentration major element liquid water-soluble fertilizer and a preparation method thereof. The fertilizer comprises the materials in parts by weight: 7-10 parts of dipotassium hydrogen phosphate, 18-20 parts of urea, 8-11 parts of potassium dihydrogen phosphate, 5-8 parts of potassium permangenate, 24-28 parts of potassium formate, 1-3 parts of EDTA-Zn, 0.5-2 parts of instant boron, and the balance water. The method comprises the steps: under the ordinary pressure and in a reaction kettle, firstly stirring potassium permangenate, potassium formate and potassium dihydrogen phosphate for 2 h according to the formula ratio under the condition of the temperature of 80 DEG C, adjusting the temperature to 45 DEG C, stirring for 0.5 h, then dissolving dipotassium hydrogen phosphate and urea in the solution according to the set formula, after the materials are dissolved completely, adding a proper amount of instant boron and EDTA-Zn, heating to dissolve, after reaction dissolution of the materials according to the formula ratio is completed, cooling to the room temperature, packaging, and thus obtaining the major element liquid water-soluble fertilizer product. The process is simple, the raw material cost is low, and the product is suitable for requirements of current dropper devices and can be widely popularized.

The invention discloses a baicalin metal complex of which the molecular formula is (C21H17O11) xM (H2O) y, wherein M in the formula is Cu (II), x is 1 and y is 2; or M is Fe (III), x is 2 and y is 0; or M is La (III) or Y (III), x is 3 and y is 0. The preparation method comprises the following steps: adding aqueous alkali into baicalin until the baicalin and alkali (sodium bicarbonate, potassium bicarbonate, sodium formate, potassium formate, sodium acetate, potassium acetate, disodium hydrogen phosphate, dipotassium hydrogen phosphate, sodium phosphate or potassium phosphate) are just completely reacted, then adding metal salt (copper salt, ferric salt, lanthanum salt or yttrium salt) for reaction to obtain the baicalin metal complex. The baicalin metal complex has obviously stronger antibacterial and antitumor activities than the baicalin, can be used for preparing antibacterial drugs and antitumor drugs, and has good development and application prospects. In the preparation method, an organic solvent is not used, a strong basic condition is not adopted, and the method is simple and feasible, is green and environment-friendly and has the advantages of low cost, high product purity and high yield.

The invention belongs to the technical field of a limestone-gypsum wet-method flue gas desulfuration process and relates to a multifunctional composite additive for a wet-method flue gas desulfuration process and a using method thereof. The composite additive comprises the following components in percentage by mass: 31 to 45 percent of nylon acid, 31 to 45 percent of sodium humate, 6 to 9 percentof organic silicon defoaming agent, 2 to 5 percent of potassium formate, 2 to 5 percent of manganese sulfate and 2 to 5 percent of p-hydroxybenzoic acid. The composite additive can promote the dissolution of the limestone and reduce the using amount of the limestone, has an enhancement factor for improving an absorption reaction of sulfur dioxide (SO2), accelerates the migration speed of SO2 gas liquid, promotes the adsorption reaction of the SO2 in a liquid membrane, inhibits the soft scales of calcium sulfate (CaSO3) from generating, improves the pH value buffer capacity of limestone slurry, slows down the reducing speed of the pH value in the process of absorbing the SO2 by the desulfuration slurry continuously, and achieves the effect of avoiding bubbling and overflow of the desulfuration slurry.

An environment-friendly high-density solid-free weighting agent comprises components in parts by weight as follows: 0.02-0.05 parts of a dispersant, 0.3-1 part of a tackifier, 0.5-1.2 parts of chelating agent, 0.6-2 parts of a corrosion inhibitor and the balance of soluble weighting materials, wherein the dispersant is one or two of sodium polyacrylate and copolymer of phosphono and carboxylic acid; the tackifier is one or more of chitosan, agar, polyacrylamide, xanthan gum and hydroxypropyl methyl cellulose; the chelating agent is one or two of aminophosphonic acid chelate resin and ethylenediamine tetraacetic acid disodium; the corrosion inhibitor is one or two of multiple polycarboxylate and sodium gluconate; the soluble weighting materials are one or more of potassium formate, potassium citrate, potassium acetate, potassium silicate and potassium sulfate. The process steps are as follows: the raw materials are taken in weight proportion, mixed and uniformly stirred; the raw materials are added to water and dissolved at the high temperature of 70-80 DEG C; a product is evaporated to dryness, and solid is obtained; the obtained solid is ground into powder, and the solid weighting agent is obtained.

Moisture is removed from gas by contacting the gas with a solution of potassium formate to remove moisture from the gas, regenerating the potassium formate solution by removing water from it, and returning the potassium formate solution to contact gas to dehydrate it. Regeneration of the potassium formate solution is most preferably accomplished in a cavitation regenerator. The gas is most preferably natural gas.

The invention provides a preparation method of 2,5-furandicarboxylic acid. The preparation method comprises the following steps: A), with non-grain biomass as a raw material, preparing furfural; B), oxidizing the furfural to obtain furoic acid; C), performing an addition reaction on the furoic acid and carbon dioxide under the action of a catalyst to obtain the 2,5-furandicarboxylic acid, whereinthe catalyst is one or more of potassium carbonate, sodium oxalate, sodium nitrate, potassium nitrate, sodium nitrite, potassium nitrite, potassium acetate, sodium acetate, potassium formate, sodium formate, sodium hydrogen carbonate, potassium hydrogen carbonate, sodium hydroxide and potassium hydroxide. The furfural is prepared from the non-grain biomass as the raw material, so that the raw material cost is low; the furoic acid reacts with the carbon dioxide under the action of the specific catalyst to obtain the 2,5-furandicarboxylic acid; the catalyst is low in price; the used carbon dioxide is environment-friendly; by the preparation method, the yield is high.

The invention provides a middle-high density elastic liquid rubber plug and a well repair method, which relates to the field of oil gas chemical industry. The middle-high density elastic liquid rubber plug is prepared by the following components in parts by weight through a crosslinking reaction: 3-5 parts of a polymer, 0.25-1.5 parts of a first cross-linking agent, 2-4 parts of a second cross-linking agent, 0.015-0.035 parts of a stabilizing agent, 0.2-0.8 parts of an additive, and 98-102 parts of a weighting agent solution. The weighting agent solution is a potassium formate aqueous solution with concentration of 40-85*10<4> mg/L, and the density can reach 1.2-1.3 g/cm<3>. The invention provides a preparation method of the middle-high density elastic liquid rubber plug. The middle-high density elastic liquid rubber plug has good fluidity at low temperature, can generate the crosslinking reaction at high temperature under well, and has the advantages of adjustable density, temperature resistance, compression resistance, good pumpability, good stability, no requirement of a rubber breaking technology, and high efficiency flowing back.

The invention disclosed an aryl nitrile group thiazole derivative for inhibiting the activity of xanthine oxidase, a method for preparing the same and application thereof. In the aryl nitrile group thiazole, R1 is methyl, ethyl, propyl, isopropyl, isobutyl, methyl cyclopropane, methyl cyclobutane, isoamyl, methyl cyclopentane, methyl cyclohexane or aromatic ring methyl, R2 is methyl or trifluoromethyl, and R3 is formic acid, sodium formate, potassium formate, lithium formate, methyl formate, or ethyl formate. Simultaneously, the invention discloses a method for synthesizing the aryl nitrile group thiazole derivative by using inexpensive raw materials, which has the advantages of simple operation, high yield, easy purification of products, application to industrial production and the like, and can obtain an efficient compound with low toxicity through screening; besides, the effective compound is expected to be widely applied to inhibit the activity of the xanthine oxidase required on animals and humans, and to become a new generation of antigout drugs and hyperuricemia drugs with special effect.

The invention provides a post-treatment method and device for methionine preparation. The post-treatment method comprises the treatment steps of filtration, acidification, gas-liquid separation, methionine separation and saturated-state acidification column regeneration. The methionine separation is performed by adopting an electrodialysis separation device or a stripping tower or alkaline resin acidification device. The hydrolysis step is that feed liquid is led to a material pipeline port at the bottom of the acidification columns and continuously passes through three serially connected acidification columns. The post-treatment device for methionine preparation comprises a filtering device, an acidic resin acidification device, a gas-liquid separation tank and a methionine separation device. For treatment of methionine production filtrate, new substances are not needed to be instructed. The energy consumption is reduced by 90%. Potassium formate can be taken out from the filtrate, and the filtrate can be beneficially circulated. A large amount of wastewater containing low-concentration formic acid is not produced, and environmental protection pressure is reduced.

The invention provides a gel-type extracting agent for drilling fluid or well completion fluid and a preparation method thereof, wherein the gel-type extracting agent comprises intermediate product P, cellulose or starch modifier and high temperature resistance oxidant which are compounded, wherein the intermediate product P is formed through utilizing biological polymer as raw materials and activating by surface activator water solution, the cellulose modifier chooses carboxymethyl cellulose, middle viscosity carboxymethyl cellulose sodium salt and low viscosity carboxymethyl cellulose sodium salt, the starch modifier chooses sodium carboxymethylstarch, cationic starch and oxygen starch, and the high temperature resistance oxidant chooses one or two of sodium formate, potassium formate, cesium formate and citric acid, and the biological polymer chooses one or two of xanthan gum, guar gum and pectin.

The invention belongs to the technical field of catalysts, and specifically relates to preparation of a nano palladium based catalyst, and an application of the catalyst in a hydrogen storage circulation system taking formate as the basis. In the catalytic system, nitrogen modified mesoporous carbon is taken as the carrier, and nano level precious metal palladium is taken as the active component and has a mass percentage of 5%. The catalyst can effectively decompose a potassium formate solution to generate hydrogen in the absence of additives and is capable of catalyzing the hydrogenation of potassium bicarbonate, the stability is good, and the catalyst can also be applied to a hydrogen storage circulation system on the basis of formate.

The invention discloses a preparation method for a 3-carbonyl-4-aza-5alpha-androstane compound. The method comprises the following steps: 1, carrying out the hydrogenation action to a 3-carbonyl-4-aza-5 -androstane alkenyl compound, formic acid and a hydrogen donor agent for 5 to 24hours at 60 to 101 DEG C, then carrying out decompression and concentration to remove the formic acid, flushing the reactants into ice water for separating crystals, and obtaining a crude product after filtration and drying; and 2, adding the crude product into a recrystallization solution for recrystallization and obtaining the product. The hydrogen donor agent can be ammonium formate, potassium formate, sodium formate or triethylammonium formate. The preparation has the moderate reaction and low cost, and is suitable for the industrialized volume production.

The invention discloses solid-free water-base thermal insulation packer fluid suitable for deep water. The solid-free water-base thermal insulation packer fluid comprises, by weight, 0.5-1.5% of flowing deformation adjusting agent, 10-30% of polyhydric alcohol, 5-30% of soluble salt, 0.2-0.6% of bactericide and the balance water. The soluble salt is any one of or any compound of NaCl, KCl, NaBr, CaBr2, CaCl2, potassium formate and sodium formate. A solid-free water-base thermal insulation packer fluid system good in performance can be obtained through the soluble salt, and thus the problems of solid-phase sedimentation, environment pollution and the like of oil-base packer fluid are solved; due to the fact that the polyhydric alcohol is added in the system, the heat conduction coefficient of the system is decreased to be 62% that of water or even lower, and the thermal insulation effect similar to that of the oil-base thermal insulation packer fluid is achieved.

A method for separating molybdenum and bismuth sulfide collective concentrate minerals relates to a mineral separation process, in particular to a method for separating the molybdenum and bismuth sulfide collective concentrate minerals to obtain molybdenum concentrate and bismuth concentrate. The invention is characterized in that the floatation separation process adopts bi-hydroxyethyl group amino sodium formate or bi-hydroxyethyl group amino potassium formate as the inhibitor of the bismuth sulfide mineral. The method of the invention efficiently overcomes the defects of large use amount ofcommon sodium sulfide, bad operation environment and heavy pollution, and has the characteristics of convenient adding, safe usage and the like. The invention provides an effective method featuring small medicament use amount, convenient usage and little environment pollution for the separation of molybdenum and bismuth sulfide minerals.

A method of removing an iron sulfide scale from a surface in fluid communication with a wellbore and/or subterranean formation comprising contacting the iron sulfide scale on the surface with a composition to dissolve the iron sulfide scale in the composition. The composition comprises (a) at least one chelating agent selected from the group consisting of DTPA, EDTA, HEDTA, GLDA, CDTA, and MGDA, and salts thereof, and (b) at least one converting agent selected from the group consisting of potassium carbonate (K₂CO₃), potassium formate (HCOOK), potassium hydroxide (KOH), potassium chloride (KCl), cesium formate (HCOOCs), and cesium chloride (CsCl). In the composition, the weight ratio of (a):(b) lies in the range 7-60:2-20.