308 results about "Carbonic acid" patented technology

The application discloses a preparation method and purification process of copper hydroxide, a certain amount of anhydrous copper sulfate is accurately weighed, and a certain volume of deionized water is added to prepare a solution with a certain concentration, a copper ammonia solution is prepared: slurry is prepared from circuit board sludge, screening is performed, ammonium bicarbonate or ammonium carbonate is added for reaction, and a copper ammonia solution containing carbonate or bicarbonate is obtained through purification; in addition, high-purity copper powder is added into concentrated ammonia water, concentrated hydrogen peroxide solution is slowly dropped into the concentrated ammonia water, and the dropping is continued until no large amount of bubbles is generated in the solution, and the solution is filtered to obtain a clear indigo blue solution. The production process adds the step of adding a stabilizer and stirring, guarantees the stable state of the copper hydroxide crystal, and enables the copper hydroxide crystal to remain unchanged into copper oxide for one year in an environment with a temperature as high as 60 degrees.

This application belongs to the field of electrolytic manganese preparation technology, specifically providing a method for preparing electrolytic manganese from manganese carbonate ore through dry polishing pre-selection and multi-stage purification, including the following steps: a) crushing and screening the manganese carbonate ore to obtain ore of a first particle size; b) subjecting the ore of the first particle size to dry strong magnetic separation pre-selection and tailings removal to obtain pre-selected concentrate; c) grinding the pre-selected concentrate to obtain a grinding product of a second particle size; d) mixing the grinding product with water or return liquid for slurry treatment to obtain a slurry; e) mixing the slurry with sulfuric acid for chemical leaching to obtain a leaching slurry; f) subjecting the leaching slurry to multi-stage purification treatment to obtain a purified electrolyte; g) electrolyzing the purified electrolyte to obtain cathode electrolytic manganese. The electrolytic manganese obtained by this application has the advantages of high purity, low water load, and low reagent consumption.

The present application relates to a kind of preparation method of trifluoromethyl pyrazole compound, belong to the technical field of organic synthesis.The specific method is: (1) trifluoroacetyl ethyl acetate is first with hydrazine hydrate cyclization reaction and generates compound of formula III;(2) under the catalysis of base, compound of formula III is reacted with difluoromethylation reagent and generates compound of formula II;(3) compound of formula II is reacted with methylating agent and obtains compound of formula I;The difluoromethylation reagent is difluoro-monochloromethane or sodium difluoro-monochloroacetate;The methylating agent is chloromethane, bromomethane, iodomethane, dimethyl sulfate or dimethyl carbonate.The present application is prepared by changing reaction route, and the higher-priced raw material methylhydrazine is replaced, and isomer impurity is no longer generated in the product prepared.Not only raw material cost is reduced, but also the purity of product is improved.

The application discloses a method for rapidly and harmlessly treating phosphogypsum, and particularly relates to the harmless treatment technical field of industrial solid waste. The method comprises the following steps: mixing raw materials with an alkaline neutralizing agent, a trapping agent and an activating agent, adding a phosphorus solidifying agent and a fluorine solidifying agent, mixing, carbonizing and aging, and obtaining harmless phosphogypsum. The method adopts the alkaline neutralizing agent to rapidly neutralize free acid and improve the pH of the system; the trapping agent adsorbs heavy metals; the activating agent promotes As, Cd and the like to form a difficult-to-dissolve iron oxide gel or a precipitate; the phosphorus solidifying agent and the fluorine solidifying agent perform deep chemical precipitation to form a stable iron-calcium-phosphate / ferric fluoride composite solidified body. The functions of the agents are clear, and the agents have synergistic effects; the solidification effect of the agents on high water-solubility phosphorus, fluorine and various heavy metals is far better than that of a single or simply compounded agent system; and the leaching concentration can be reduced to a level far lower than the national standard.

Provided is a method for separating impurities and cobalt without using an electrolysis process from a cobalt chloride solution containing impurities and producing a high purity cobalt sulfate. The production method for cobalt sulfate includes: a copper removal step (S1) of adding a sulfurizing agent to a cobalt chloride solution containing one or more impurities of copper, zinc, manganese, calcium, and magnesium and generating a precipitate of sulfide of copper to separate to remove copper; a neutralization step (S2) of adding a neutralizer or a carbonation agent to a cobalt chloride solution having undergone through the copper removal step (S1) and generating cobalt hydroxide or basic cobalt carbonate to separate magnesium; a leaching step (S3) of adding sulfuric acid to the cobalt hydroxide or the basic cobalt carbonate to obtain cobalt sulfate solution; and a solvent extraction step (S4) of bringing an organic solvent containing an alkyl phosphoric acid-based extractant to the cobalt sulfate solution and extracting zinc, manganese, and calcium into the organic solvent to separate to remove zinc, manganese, and calcium. These steps are sequentially executed.

This invention provides a water-resistant, non-isocyanate-based polyurethane adhesive, its preparation method, and its applications. The adhesive features a cross-linked network structure obtained by reacting a trifunctional five-membered cyclic carbonate with tris(2-aminoethyl)amine; the trifunctional five-membered cyclic carbonate has the structure shown in Formula I. This non-isocyanate-based polyurethane adhesive is suitable for a wider range of environmental conditions and applications. It can be used not only in dry environments but also maintains good adhesion performance in humid, high-humidity, and even underwater environments, unaffected by moisture. Even after being submerged underwater for a period of time, its adhesive strength after removal and air drying is still similar to that of the unsubmerged sample, thus meeting the bonding requirements in humid environments, such as bonding items in bathrooms, kitchens, and outdoor construction. This expands the application field of polyurethane adhesives, providing a more reliable solution for various industrial and civilian bonding needs.

The utility model relates to the field of catalyst recycling technology, especially relates to a carbonic acid dimethyl ester synthesis is with catalyst recycling device. Including recovery jar, the recovery jar is installed with the stirring assembly for stirring catalyst, the recovery jar is installed with the heating assembly for heating catalyst, recovery assembly is installed on the recovery jar for recycling the hot air of discharge, the utility model discloses through the setting of recovery assembly, and the recovery jar exhausts the hot and humid gas and exchanges heat with the outside air in the heating box, and the preheating of air is carried out, thereby reducing the temperature difference of the air that advances the wind and heats to dry exhaust air, realizes the recycling of the waste heat in the hot and humid gas, reduces the energy waste that the direct discharge of heat causes, and reduces the energy consumption cost of heating process.

This invention discloses a method for synthesizing cefotiam, using 7-aminocephalosporanic acid (7-ACA) as the parent nucleus and introducing a 4-dimethylaminopyridine-dimethyl carbonate composite catalytic system. The reaction is carried out in a one-pot process involving 3-position nucleophilic substitution, 7-position amidation, and simultaneous deprotection in a green mixed solvent of ionic liquid [BMIM]BF₄-water with 1-(2-dimethylaminoethyl)-1H-5-mercapto-tetrazole and compound I. This method simplifies the process, improves selectivity, produces a high-purity product with stable yield, and is suitable for industrial production.

The utility model relates to carbonic acid dimethyl ester production technical field, and disclose a kind of carbonic acid dimethyl ester production device of continuous feeding, the bottom surface of feed hopper is fixedly installed with conveying pipe, the inside of conveying pipe is fixedly installed with gear, the outside of gear is engaged to be connected with transmission crawler belt, the side surface of transmission crawler belt is fixedly installed with hopper, the bottom surface of conveying pipe is fixedly installed with discharge hopper, the bottom surface of discharge hopper is fixedly installed with recombinant component separation device.This carbonic acid dimethyl ester production device of continuous feeding, raw material is entered into conveying pipe by feed hopper, in conveying pipe, raw material will fall into hopper, hopper is driven by gear to transport raw material by transmission crawler belt, compared with ordinary transmission device, transmission crawler belt can adapt to bending lifting operation, and it has longer service life, and individual component can be replaced and repaired, maintenance cost is also lower in later period, hopper not only can transport solid raw material, but also can transport liquid raw material.

A method for producing thermoplastic polyoxazolidinone includes copolymerizing a diisocyanate compound (A) with a diepoxide compound (B) in a solvent (E) optionally in the presence of a specific quaternary ammonium, quaternary phosphorus, and / or quaternary antimony-based catalyst (C), compound (D), and compound (F), wherein compound (D) and compound (F) independently comprise at least one of a monofunctional isocyanate, a monofunctional epoxide, a cyclic carbonate, a monofunctional alcohol, and a monofunctional amine, and wherein the method is free of solvents (G) with a boiling point above 200°C (absolute) at 1 bar, preferably above 190°C, and more preferably above 180°C. The invention also relates to the resulting thermoplastic polyoxazolidinone.

The application provides a recyclable phase change microcapsule and a preparation method thereof, and comprises the following steps: (1) preparing a surfactant solution; (2) adding a phase change material into the surfactant solution and uniformly dispersing to obtain an emulsified solution; (3) adding a solution containing magnetic metal ions into the emulsified solution and uniformly stirring to obtain a mixed solution; (4) adding a solution containing carbonate or hydroxyl into the mixed solution, so that the carbonate or hydroxyl reacts with the magnetic metal ions to form a coating wall material of the capsule; (5) performing cooling treatment on the solution in the stirring state in (4) until the microcapsule is coagulated into a small spherical shape, and then the recyclable phase change microcapsule is obtained after separation, washing and drying. The application can realize the repeated use of the microcapsule, and the capsule wall of the microcapsule is all inorganic material with magnetism, which has high flame retardance, mechanical strength and thermal conductivity, so that the microcapsule can be better used in the field of building energy-saving materials.

A method of the present disclosure for producing an electrode active material sheet includes providing an electrode mixture comprising active material particles, a binder, and ethylene carbonate, and pressing the electrode mixture with a press member, wherein pressing the electrode mixture with the press member includes at least partially melting the ethylene carbonate.

The application discloses a CO2 capture method and system based on fuel staged conversion coupled with chemical looping combustion, and the method comprises the following steps: flue gas is introduced into a carbonation tower filled with metal oxygen carriers MeO and adsorbents A, the adsorbents A adsorb CO2 in the flue gas, and then the solid in the tower is transported to a calciner; the adsorbents A after adsorption are decomposed into the adsorbents A and CO2 in the calciner, the MeO in the calciner reacts with the substances transported in a fuel pre-conversion reactor to generate a reduced metal oxygen carrier; the regenerated adsorbents A and the reduced metal oxygen carrier in the calciner are transported to an air reactor to generate MeO and regenerated adsorbents A which are returned to the carbonation tower; fuel and reactants are introduced into the fuel pre-conversion reactor, part of the fuel is converted, and the products are sent into the calciner. Through fuel partial conversion and chemical looping combustion, the application realizes grade matching of the fuel conversion and the adsorbent regeneration process, avoids air separation energy consumption of separated pure oxygen, and effectively reduces CO2 capture energy consumption after medium-high temperature adsorption combustion.

The present application relates to a kind of preparation methods and systems of electronic grade dimethyl carbonate prepared from dimethyl oxalate, the method comprises the following steps: dimethyl oxalate is preheated and sent into decarboxylation reactor to carry out decarboxylation reaction, carbon monoxide, dimethyl carbonate and other light components are extracted from the top of decarboxylation reactor, and heavy components are extracted from the bottom of decarboxylation reactor;Carbon monoxide, dimethyl carbonate and other light components extracted are separated after gas-liquid, and liquid phase dimethyl carbonate is sent into rectifying column to carry out rectification purification;Electronic grade dimethyl carbonate product is obtained by crystallization purification in refrigeration crystallization device after rectification, and crystallization mother liquor returns rectifying column;Decarboxylation reactor is three-stage reaction tower, and rectifying section, reaction section, stripping section are sequentially from top to bottom.The present application is completely reacted by the design of three-stage decarboxylation reactor;Heavy components generated are extracted in real time, and catalyst stability is high;Electronic grade DMC is prepared by using rectifying column coupled with crystallization tower, and the yield of DMC is significantly improved.

The utility model discloses a one key presses and switches filter material's water outlet device, including the body that is equipped with the water passing cavity and the water outlet, and the water passing cavity is connected with the water outlet, is equipped with the ejection assembly in the body, and it can axial movement and has the cavity of placing filter material. Ejection assembly realizes the cavity switching in the body through the cooperation of the guide column and the undulating guide groove, and in combination with spring reset and one -way valve check structure ensures that the operation is convenient and safe. The utility model discloses through pressing quick replacement filter material, simplifies the operation step, prevents water flow splashing, optimizes water flow path to fully flush filter material, is applicable to carbonic acid spring wash head and a variety of scenes, has remarkable technical advantage and market application prospect.

The application provides a method for preparing carbon nitride-carbonate bismuth oxide composite nanosheets by a molten salt one-pot method, sodium bismuthate, melamine and sodium nitrate are mixed and uniformly ground to obtain a solid mixture; the solid mixture is heated at 350 DEG C, sodium nitrate is molten to form an ionic molten salt medium, and a one-pot reaction is simultaneously carried out in the medium: sodium bismuthate and melamine are converted into carbonate bismuth oxide through an oxidation-reduction reaction, melamine is simultaneously converted into graphite phase carbon nitride through a polymerization reaction, and the synergistically generated carbonate bismuth oxide and graphite phase carbon nitride are in-situ compounded to form g-C3N4-Bi2O2CO3 composite nanosheets. The application is based on a synthesis strategy of realizing multiple chemical reactions in a single molten salt environment, in-situ compounding to form a heterojunction, and simultaneously generating g-C3N4 and Bi2O2CO3 in one step and in-situ bonding, and the preparation steps are simple, the operation is convenient, the reaction conditions are mild, and the method is suitable for industrial production.

This invention relates to the field of chemical synthesis technology, specifically disclosing a method for preparing vinyl ethylene carbonate. The method uses glycidyl as a starting material, first converting it to glycidaldehyde via a mild oxidation reaction with high selectivity. Then, using a cross-linked imidazole polymeric ionic liquid as a catalyst, glycidaldehyde undergoes an atom-economical cycloaddition reaction with carbon dioxide to construct a cyclic carbonate intermediate. Finally, under catalytic conditions, a condensation reaction introduces a vinyl functional group to obtain the vinyl ethylene carbonate product. This invention uses widely available, low-toxicity, and inexpensive glycidyl instead of highly toxic raw materials, and utilizes greenhouse gas carbon dioxide as a carbonyl source for resource utilization. The process route is highly atom-economical, the reaction conditions are mild, and the catalyst is easy to separate, recover, and recycle, effectively solving the prominent problems of high raw material toxicity, expensive catalysts, and difficult byproduct treatment in traditional preparation techniques.

This invention discloses an apparatus and process for removing sulfur dioxide from flue gas using siderite slurry, relating to the field of environmental protection technology. The apparatus comprises six major components: desulfurization, slurry circulation, slurry replenishment, oxidation, defoaming emission, and spent slurry treatment. The components are interconnected by pipelines. The process includes siderite pretreatment slurry preparation, slurry replenishment, flue gas desulfurization, sulfite oxidation, flue gas defoaming emission, and spent slurry treatment. Siderite is crushed and ground into a slurry with a specific particle size and solids content, which is then contacted countercurrently with sulfur-containing flue gas. Utilizing ferric carbonate, magnesium carbonate, and calcium carbonate in the slurry as desulfurizing agents, combined with the oxidation effect of air and ferric ions, sulfur dioxide is converted into ferric sulfate and calcium sulfate, achieving desulfurization. This invention has high desulfurization efficiency, with the sulfur dioxide content in the purified flue gas below 50 mg / Nm³. 3 It makes full use of low-grade siderite resources, and the desulfurization by-products can be utilized as resources. The process is simple and has no secondary pollution, resulting in significant economic and environmental benefits.

This invention discloses a fruit juice jelly soda and its preparation method, relating to the field of food processing technology. The fruit juice jelly soda comprises liquid materials and carbon dioxide gas, with a volume ratio of liquid materials to carbon dioxide gas of 1:(1-2). The liquid materials comprise the following raw materials in parts by weight: 1000 parts water, 50-100 parts fructose syrup, 30-50 parts carbonated white sugar, 10-50 parts concentrated fruit juice, 5-10 parts sodium chloride, 5-10 parts compound thickener, 1-5 parts anhydrous citric acid, 1-3 parts potassium sorbate, 0.01-0.1 parts food coloring, and 1-3 parts food flavoring. The fruit juice jelly soda of this invention combines the flavor of fruit juice jelly with the refreshing taste of carbonated soda.

The application provides a calcium method carbon capture and waste heat power generation integrated system and method. The system comprises an absorption reactor, a calcination reactor, a power generation cycle loop, a first heat exchanger and a second heat exchanger. The absorption reactor is used for carbonation exothermic reaction of calcium oxide and carbon dioxide in flue gas. The calcination reactor is used for calcination of generated calcium carbonate, regeneration of calcium oxide and generation of carbon dioxide. The power generation cycle loop comprises a working medium water pipeline and a feed water pump, an expansion generator and a condenser connected thereto. The first heat exchanger is arranged in the absorption reactor and connected to the working medium water pipeline, and is used for absorbing heat released in the carbonation exothermic reaction. The second heat exchanger is in communication with the carbon dioxide flue gas outlet of the calcination reactor, and is connected to the working medium water pipeline and located upstream of the first heat exchanger, and is used for recovering sensible heat of the carbon dioxide flue gas to preheat the working medium. The method utilizes the above system, and heats the working medium by gradient recovery of reaction heat and flue gas sensible heat and drives the expansion generator to generate power.

This invention provides a calcium carbonate compound and an inorganic molded body with shape controlled by having a high aspect ratio. The invention relates to a calcium carbonate compound having a phosphorus content of 1000 ppm or more and 15000 ppm or less, a sulfur content of 2000 ppm or less, and an aspect ratio (mean major axis to mean minor axis) of 6 or more and 19 or less.

A polycarbonate composition includes particular amounts of a bisphenol A homopolycarbonate, a polycarbonate including repeating units derived from a substituted or unsubstituted cyclohexylidene-bridged bisphenol, and a polyester-carbonate. The composition can exhibit a combination of desirable properties, including low haze and good scratch resistance. Methods for the manufacture of the composition and articles including the composition are also disclosed.

The application provides a carbon dioxide capturing method. The carbon dioxide capturing method comprises the following steps: spraying an alkaline solution through a spraying structure, so that the alkaline solution flowing out of the spraying structure chemically reacts with carbon dioxide gas in a gas to absorb the carbon dioxide gas; buffering the solution after the chemical reaction with the carbon dioxide gas through a buffering structure, and making the solution buffered in the buffering structure flow out through the spraying structure; detecting the concentration of hydroxyl ions and / or the concentration of carbonate ions in the solution in the buffering structure in real time, and supplementing the alkaline solution or water in the buffering structure according to the concentration of hydroxyl ions and the concentration of carbonate ions; if the concentration of hydroxyl ions is less than or equal to m and the concentration of carbonate ions is n, stopping the operation of a circulating pump to make the solution buffered in the buffering structure enter an electrolysis device to be electrolyzed. The application effectively solves the problem that the capturing efficiency of carbon dioxide gas and the overall energy consumption of the carbon dioxide capturing system in the prior art are difficult to control.

This invention discloses a method for treating wastewater containing magnesium sulfate and ammonium sulfate. The method includes: evaporating and concentrating the wastewater containing magnesium sulfate and ammonium sulfate, then cooling and crystallizing it, followed by solid-liquid separation to obtain magnesium ammonium sulfate crystals and a mother liquor containing ammonium sulfate; reacting the magnesium ammonium sulfate crystals with an ammonium salt that can generate carbonate ions and water to undergo a precipitation reaction, followed by solid-liquid separation to obtain magnesium carbonate product and a mixed solution containing ammonium sulfate and ammonium carbonate; stripping the mixed solution containing ammonium sulfate and ammonium carbonate to obtain stripped water containing ammonium sulfate and an ammonium carbonate fraction; both the mother liquor containing ammonium sulfate and the stripped water containing ammonium sulfate can be evaporated and crystallized to obtain ammonium sulfate product; the ammonium carbonate fraction can be recycled for precipitation reactions. This invention can effectively separate magnesium and ammonium from wastewater, and the separated magnesium carbonate and ammonium sulfate products have high purity and good quality, and can be used directly as products.

A monitoring device for a carbonic acid solution comprises: a container for holding a selected volume of an aqueous solution; a source of a plane polarized laser beam at a selected wavelength propagating longitudinally through the solution; two photodetectors arranged to measure the intensity of light from said propagating laser beam scattered in two respective directions θ1, θ2 normal to the beam path, wherein the first of the two directions is parallel (θ1=θ°) to the direction of polarization and the second of the two directions forms a nonzero angle (θ2>0°) with the direction of polarization. The ratio of the scattered intensity in the two respective directions may used to determine a measure of quality of the carbonic acid wherein a greater degree of scattering in the direction of polarization θ1 than in the second direction θ2 indicates a more complete formation of stable carbonic acid.

The application relates to a pure water resistivity adjusting device, a pure water resistivity adjusting method and computer equipment. A driving adjusting assembly is communicated with a carbonic acid production assembly and a pure water pipeline, so that carbonic acid solution is driven into the pure water pipeline to reduce the resistivity of the pure water. Since water pressure information of the pure water pipeline is related to the flow of the pure water in the pure water pipeline, the driving adjusting assembly can also detect the water pressure information of the pure water pipeline, adjust the driving parameter of the driving adjusting assembly according to the water pressure information of the pure water pipeline, control the flux of the carbonic acid solution into the pure water pipeline, and then adjust the resistivity of the pure water in the pure water pipeline. Through the pure water resistivity adjusting device, the driving parameter of the driving adjusting assembly can be automatically adjusted according to the water pressure information of the pure water pipeline, the resistivity of the pure water is adjusted, and static electricity in the pure water is removed.

A method for recovering lithium from waste according to the present invention comprises the steps of: preparing lithium carbonate; converting the lithium carbonate into slurry containing lithium hydroxide and calcium carbonate by using calcium hydroxide; performing solid-liquid separation of the slurry; first purifying the solid-liquid separated lithium hydroxide aqueous solution to obtain solid waste and a purified lithium hydroxide aqueous solution; second purifying the purified lithium hydroxide aqueous solution through an ion exchange resin; crystallizing the lithium hydroxide aqueous solution subjected to the second purification to obtain lithium hydroxide, wherein the second purification step utilizes an acid regeneration method to regenerate the ion exchange resin, thereby generating acid-regeneration wastewater and a lithium hydroxide purge solution is generated in the step of crystallizing the lithium hydroxide aqueous solution; carbonating the lithium hydroxide purge solution to obtain lithium carbonate and lithium carbonate purge wastewater; preparing a wastewater mixture by mixing the acid-regeneration wastewater, the lithium carbonate purge wastewater, and the solid waste; neutralizing the wastewater mixture; introducing a lithium adsorbent into the neutralized wastewater mixture to selectively adsorb lithium; desorbing the adsorbed lithium to obtain a desorption solution; carbonating the desorption solution to obtain lithium carbonate and a carbonated filtrate; and recycling the carbonated filtrate to the step of neutralizing the wastewater mixture.