45results about How to "Guaranteed Purity Requirements" patented technology

The invention belongs to the technical field of lithium-ion batteries and particularly relates to an efficient method for preparing difluorophosphates. The method comprises the following steps: metering a hexafluorophosphate solution with the concentration being 5wt% to 50wt% and a cyclosiloxane or an acetal, then, introducing the metered materials to a microchannel reactor, carrying out a reaction for 60 to 900 seconds at the temperature of 20 DEG C to 150 DEG C, carrying out membrane filtration on an obtained reaction solution, and then, carrying out concentrating and drying, thereby obtaining a corresponding difluorophosphate product. The method disclosed by the invention has the advantages that the process route is simple, the raw materials are readily available, the reaction efficiency is high, the energy consumption is low, the product purity is high, and the like.

The invention discloses a method for producing high-purity silver powder by using a silver-containing dead catalyst, and belongs to the technical field of noble metal refining. The method comprises the following steps: the silver-containing dead catalyst is used as a raw material, silver is dissolved and converted to silver nitrate solution by dilute nitric acid; a precipitant is added in the silver nitrate solution after the filtration; a silver-containing compound precipitate is pulped after being filtered and washed; one or two reagents are randomly chosen from hydrazine hydrate, hydrogen peroxide, sodium borohydride, formic acid, ascorbic acid, glucose, fatty aldehyde, fatty amine and formaldehyde as reducing agent; any one reagent is chosen from polyvinylpyrrolidone, cetyl trimethyl ammonium bromide, lauryl sodium sulfate, polyethylene glycol and between as a protective agent; silver ions are reduced to silver particles under the condition of ultrasonic oscillation; and the silver particles are precisely filtered, and are dried in vacuum to obtain the high-purity silver powder product. The method has the benefit that the high-purity silver powder product with high purity, high dispersity and high activity can be obtained, and has the advantages of stable product performance, high recovery rate and environmental friendliness.

The invention discloses a method for producing tetraammine chloride crystals by taking ethanol as a solvent, belonging to the technical field of petrochemical industry. The method comprises the following steps of: dissolving and transforming simple substance platinum serving as a raw material into a stable +4 valent chloroplatinic acid solution with royal water, and performing niter driving and acid driving treatment; controlling the final point of a reaction system to reduce the +4 valent chloroplatinic acid solution into a +2 valent chloroplatinous acid solution in a metastable state by taking hydrazine hydrate as a reducing reagent; adding ammonia water for aminating, complexing and coordinating the +2 valent chloroplatinous acid solution, and transforming into a tetraammine chloride solution; controlling the concentration of the tetraammine chloride solution, mixing the tetraammine chloride solution with ethanol serving as a crystalizing reagent, crystallizing, and quickly crystalizing and separating tetraammine chloride out of the solution; and performing suction filtration and drying to obtain a tetraammine chloride crystal product. The method has the beneficial effects of capability of ensuring the purity requirement of the product, stable and reliable product quality, high yield, mild reaction condition, easiness, practicability and environmental friendliness.

The present invention relates to a propylene recovery method. A purpose of the present invention is mainly to solve the high energy consumption in the prior art. According to the present invention, the propylene recovery refining process containing the high pressure propylene recovery tower, the low pressure propylene recovery tower and the depropanization tower is used to well solve the problem in the prior art, and the method can be used for the propylene recovery through the propylene oxide device in the industrial production.

The invention relates to a production equipment of epoxypropane. The production equipment is mainly used for solving a problem of the prior art that energy consumption is high. The production equipment comprises a reactor, a high pressure propylene recovery tower, a low pressure propylene recovery tower, and a depropanizing tower, wherein operation pressure of the high pressure propylene recovery tower ranges from 0.5 to 3.5MPa as gage pressure, and operation pressure of the low pressure propylene recovery tower ranges from 0.1 to 0.4MPa as gage pressure. The production equipment is capable of solving the problem preferably, and can be applied to industrial production of epoxypropane.

The invention discloses a urea separation and purification method which comprises the following steps: a pretreatment operation is performed; coke oven gas feed gas is transported to an oil removal tower for tar removal operation, and when the content of the tar is removed to 23 mg/m<3> or less, the coke oven gas is sent into a first section of a coke oven gas compressor for pressurization operation; the pressurized coke oven gas is subjected to pretreatment operation, and when the content of the tar is removed to 5.5 ppm or less and the content of naphthalene is removed to 1 mg/m<3> or less, the coke oven gas is sent into a second section of the coke oven gas compressor for pressurization operation; the pretreated coke oven gas is transported to a boiler for combustion, or is unloaded after combustion by a torch. The method can be applied to the urea preparation technology field; and with application of the method, gas of mixed feed gas in the preparation process can be effectively controlled, so as to ensure purity requirements of the finally-produced urea.

The invention provides a production method of niacin/isonicotinic acid granules by extrusion and granulation, comprising the following steps: lifting a hopper to a measuring tank and measuring the materials in the hopper and tabletting the materials in a tablet machine, crushing, screening the tablets to obtain the granular niacin/isonicotinic acid product with grain size of 0.2-0.8mm, respectively returning the over-large or over-small granules into the crushing and measuring step. The niacin/isonicotinic acid granules prevents the defects of the niacin/isonicotinic acid powder produced by the prior production method such as severe dust pollution of package, application place due to over-small grain size and grains cluster phenomena in storage and transportation and provides the convenience for the use of the niacin/isonicotinic acid granules as additives.

The invention discloses a steel wet desulphurization wastewater treatment system and method. The method comprises the following steps: carrying out plate-and-frame pressure filtration, secondary chemical hardness removal, concentration precipitation on steel wet desulfurization wastewater, conducting filtration treatment to remove impurities in the wastewater, carrying out deamination treatment to remove ammonia nitrogen in the wastewater, and carrying out softening treatment, nanofiltration membrane treatment, membrane treatment or electrodialysis treatment and evaporative crystallization treatment to obtain clear water and high-purity sodium sulfate and sodium chloride. According to the method, complex factors such as gypsum suspended solids, high hardness, high chloride ions, high ammonia nitrogen, high sulfate ions, fluorine ions, heavy metal ions and COD in the wastewater can be effectively removed, the obtained clear water can be recycled as industrial new water, and zero discharge treatment of the steel wet desulfurization wastewater is realized; and high-purity sodium chloride and sodium sulfate salt with certain economic recovery value are obtained, so that recycling of resources is realized.

A 304 stainless steel smelting method by an AOD (argon oxygen decarburization) converter comprises 1) a silicon aluminum oxidation stage; 2) a main decarbonization stage; 3) a dynamic decarburization stage; 4) a reduction stage; and 5) desulfurization alloying; and is characterized in that: silicon mixed manganese ore balls are added in the reduction stage, the silicon mixed manganese ore balls are prepared by mixing and pressing manganese ore powder with a manganese percent content of 25-40% and ferrosilicon powder in a ratio of 7:3, the dosage of the silicon mixed manganese ore balls is 0.01-0.02 ton / ton steel, the silicon mixed manganese ore balls are averagely added in 2 to 3 times at intervals of 2 to 3 minutes; the decarbonization stage smelting temperature of the AOD converter is 1560 to 1620 DEG C; in the desulfurization alloying stage, lime is supplemented, and the lime adding amount is 0.04-0.06 ton / ton steel. According to the method, silicon mixed manganese ore is used for replacing manganese alloy, the production cost can be effectively reduced, the purity of molten steel can be ensured, manganese alloy production link can be directly omitted, and the pollution of the environment can be reduced.

The invention relates to an iron-cobalt-tantalum alloy powder preparation method, iron-cobalt-tantalum alloy powder, and an application. The iron-cobalt-tantalum alloy powder preparation method includes the steps that firstly, iron, cobalt, and tantalum are prepared according to a target atomic ratio and mixed; then the iron, the cobalt, and the tantalum are melted completely under the temperatureof 1650-1750 DEG C; and then atomizing is carried out under the action of inert gas, and the iron-cobalt-tantalum alloy powder is obtained. According to the preparation method, the melting temperature of an iron-cobalt-tantalum mixture is controlled at 1650-1750 DEG C, and the atomizing conditions are optimized, so that the purity of the prepared iron-cobalt-tantalum alloy powder is greater thanor equal to 99.95%, and the oxygen content is less than or equal to 600 ppm. The iron-cobalt-tantalum alloy powder with the particle size less than 150 meshes is obtained by sieving, which is conducive to the preparation of an iron-cobalt-tantalum alloy sputtering target material with high purity, high density, high bending strength and qualified magnetic flux. Tantalum scrap of a tantalum targetmaterial is used as a tantalum material for preparation, which realizes the transformation of waste into treasure.

The invention relates to an epoxy propane production method, and is used for mainly solving the problem of high energy consumption in the prior art. The problem is better solved through adopting the technical scheme that the epoxy propane production method comprises the steps: a liquid material flow is generated from cumyl hydroperoxide and propylene in a reactor; the liquid material flow goes into a flash tank, a first light component material flow is obtained at a tank top, and a first heavy component material flow is obtained at a tank bottom; the first light component material flow goes into a high pressure propylene recovery tower, a second light component material flow is obtained at a tower top, and a second heavy component material flow is obtained at a tower kettle; the first heavy component material flow goes into a low-pressure propylene recovery tower, a third light component material flow is obtained at a tower top, and a third heavy component material flow is obtained at a tower kettle; a part of the second light component material goes into a depropanizing tower, a fourth light component material flow is obtained at a tower top, and a fourth heavy component material flow is obtained at a tower kettle; and a part of the second light component material flow except the part going into the depropanizing tower, the third light component material flow and the fourth light component material flow circulate back to the reactor. The epoxy propane production method can be used for industrial production of recovery of propylene with an epoxy propane device.

The invention provides an active-disturbance-rejection control structure and a control method for a binary rectification process, and belongs to the technical field of energy-saving control of a chemical rectification process. The technical problems that various external disturbances exist in the existing rectification process, so that various states in the rectification tower are deviated, the process energy is wasted, and meanwhile, the product quality is influenced are solved. According to the technical scheme, the control structure for the product purity and quality of the binary rectifying tower comprises four control loops, namely a condenser liquid level control loop, a reboiler liquid level control loop, a tower top light component product concentration control loop and a tower bottom light component product concentration control loop; the control method comprises the step of realizing control of the four control loops by designing the four active-disturbance-rejection controllers. The control method has the beneficial effects that the degree of dependence of the control method on a mathematical model in the rectification process is low, the set value tracking of the concentration of the products at the tower top and the tower bottom can be realized, the purity of the products is ensured to be slightly influenced under the condition that the feeding flow or components are greatly disturbed, and the method has relatively strong robustness and stability.

The invention relates to a propylene recovery device, and is used for mainly solving the problem of high energy consumption in the prior art. The problem is better solved through adopting a propylene recovery refining device comprising a high-pressure propylene recovery tower, a low-pressure propylene recovery tower and a depropanization tower, and the propylene recovery device can be used for industrial production of recovery of propylene with an epoxy propane device.

The invention relates to method which is adopted the electrochemistry purification-loosing to prepare the metal nickel powder. It prepares the high performance metal nickel powder by adopting the electrochemistry purification-loosing processing technology at first, then the oxidation reduction technology. The method is adopts the metal nickel plate with high purity to gain the foamed metal nickel with high porosity and purity after the processing of the electrochemistry purification-loosing. The foamed metal nickel is conducted oxidation treatment with dynamic gyration. The brittle nickel oxide foam is gained after the oxidation. Then the foamy nickel oxide is conducted multistage shearing crushing; the nickel oxide powder with different granularity is gained after the classification by sedimentation method. The nickel oxide powder is conducted reduction treatment in stages by cracked ammonia. Thus the high quality metal nickel powder with high purity, fine crystal grain, and small loosing ratio is produced. The advantages of the invention are that the non contaminant is discharged; it is good for the environmental protection; the process flow and the cost are reduced; and it can ensure the production of gaining the metal nickel powder with high performance. The metal nickel powder with high performance produced by the preparation method can be widely applied to the sintered metal product (hard alloy, diamond tool, nickel iron alloy product, nickel base product) stainless steel product, battery, and chemical industry product.

The invention relates to a production method of propylene oxide, which mainly solves the problem of high energy consumption in the prior art. The present invention comprises the following steps by adopting: a) cumene hydroperoxide and propylene react in a reactor to generate a liquid phase stream; b) the liquid phase stream enters a high-pressure propylene recovery tower, and the first light component stream is obtained at the top of the tower , the tower reactor obtains the first heavy component stream; b) the first heavy component stream enters the low-pressure propylene recovery tower, the tower top obtains the second light component stream, and the tower reactor obtains the second heavy component stream; c) the second The light component stream is divided into two parts, wherein a part of the stream enters the depropanizer, the top of the tower obtains the third light component stream, and the tower reactor obtains the third heavy component stream; d) the first light component stream, the second light component stream The technical scheme of removing the split part entering the depropanizer from the split stream and recycling the third light component stream back to the reactor solves this problem well, and can be used in the industrial production of propylene oxide.

The invention discloses a three-phase-type oxidoreduction metal chromium powder preparation technology, a purification treatment technology is firstly conducted on a metal chromium plate, then an oxidoreduction technology is conducted, and thus high-performance metal chromium powder is prepared. According to the three-phase-type oxidoreduction metal chromium powder preparation technology, the metal chromium plate with high purity is adopted, after purification technology treatment is conduct, and foam metal chromium with high porosity and high purity is obtained; dynamic rotary oxidation treatment is conducted on the foam metal chromium, and fragile chromic oxide foam is obtained after full oxidation is conducted; then the spumescence chromic oxide is cut and crushed in a multistage mode,and chromic oxide powders with different particle sizes are obtained after sedimentation method is adopted to classify; grading reduction treatment is conducted on the chromic oxide powders by using cracked ammonia, and thus the high-quality metal chromium powder with high purity, fine particle size and small loose density is manufactured. The three-phase-type oxidoreduction metal chromium powderpreparation technology has the advantages that no pollutant is discharged, environmental protection is facilitated, the technologic process is shortened, the cost is lowered, and it can be ensured that the high-performance metal chromium powder is manufactured and obtained. The high-performance metal chromium powder manufactured through the preparation method can be widely applied to powder metallurgy products (hard alloys, diamond tools, ferrochrome products, chrome base products and the like), stainless steel products, batteries, chemical products and the like.

The invention discloses a method for improving the performance of metal chromium powder by an oxidation-reduction process. A metal chromium plate is first subjected to a purification treatment process, then an oxidation and reduction process is performed, and high-performance metal chromium powder is prepared. The method adopts the metal chromium plate with high purity, and the metal chromium plate is processed by the purification process to obtain foam metal chromium with high porosity and high purity; the foam metal chromium is subjected to dynamic rotary oxidation treatment, and fully oxidized to obtain brittle chromium oxide foam; then foam-shaped chromium oxide is subjected to multi-stage shearing and crushing, and chromium oxide powder of different particle sizes is obtained after grading is performed by a sedimentation method; and the chromium oxide powder is subjected to a graded reduction treatment by decomposing ammonia, and high-quality metal chromium powder with high purity, small crystal particles and a small specific ratio is obtained. The method has the advantages that no pollutant discharge is achieved, environmental protection is facilitated, the process flow is shortened, the cost is reduced, and the production of the high-performance metal chromium powder is ensured. The preparation method produces the high-performance metal chromium powder, and the high-performance metal chromium powder can be widely applied to powder metallurgy products (hard alloys, diamond tools, ferrochrome products, chromium-based product and the like), stainless steel products, batteries, chemical products and the like.