35results about How to "Precise pH Control" patented technology

The invention discloses a preparation method of an anodepositive electrode material of a lithium ion battery with a porous laminated structure, which comprises the following steps that agar powder is dissolved in water to form a hot agar solution at the temperature of 90 to 99 DEG C; then lithium salt, nickel salt, manganese salt and cobalt salt are dissolved in the hot agar solution to form a red clear solution, the red clear solution is cooled to form red jellylike gel, and the red jellylike gel is frozen and freeze-dried to obtain aerogel; and the aerogel is calcined for 1 to 6 hours at the temperature of 400 to 600 DEG C, and then the aerogel is calcined for 10 to 30 hours at the temperature of 700 to 950 DEG C. When the anodepositive electrode material of the rich laminated lithium ion battery is formed, the micron porous morphology is kept, particles comes into good contact, even if in the condition that large primary particles are formed, good magnification performance is provided, and additionally, higher cycling stability is kept. The invention further discloses the anodepositive electrode material of the lithium ion battery with the porous laminated structure and a formed three-dimensional micron porous structure, and the anodepositive electrode material has good crystallinity.

The invention discloses a preparation method of a reticular porous lithium-manganese-rich-based positive electrode material for a lithium ion cell. The preparation method comprises the following steps: dissolving lithium salt, nickel salt, manganese salt and cobalt salt into deionized water according to a certain ratio, so as to form a transparent solution; adding appropriate amount of cane sugar serving as a complexing agent according to the added metal salts, so as to form a transparent solution; heating for evaporating the solution, so as to remove water and obtain colloidal sol, and finally obtain gel; calcining the gel for 1-6 hours at the temperature of 400-600 DEG C, and then calcining the gel for 10-30 hours at the temperature of 700-950 DEG C, so as to finally form the reticular porous lithium-manganese-rich-based positive electrode material for the lithium ion cell. The preparation method is simple in process, the obtained reticular porous lithium-manganese-rich-based positive electrode material has excellent contact effect between particles and large specific surface area, thus the rate capability of the material is improved.

A process for preparing fertilizer from fish, and a fertilizer prepared from said process, is disclosed. The fertilizer is for use on soil and plants. The process involves hydrolysis of fish with a phosphorus containing acid, preferably an inorganic phosphorus based acid, under normal ambient conditions. Typically, phosphoric acid is used. The fertilizer prepared from the disclosed process contains 1 to 10% by weight of the phosphorus based acid.

The invention discloses a preparation method for superparamagnetism ferrite nano particles, relates to nanometer materials and provides a quick, environment-friendly and convenient preparation method for the superparamagnetism ferrite nano particles. The preparation method comprises the following steps: adding a sodium hydroxide solution into oleinic acid, stirring so as to obtain a white sodium oleate solid; then utilizing absolute ethyl alcohol to dissolute the sodium oleate solid during the stirring process and obtaining a homogeneous and transparent solution A; adding a hydrazine hydrate solution into the solution A during the stirring process; continuously stirring, enabling reactants to be well mixed and obtaining a homogeneous and transparent solution B; sequentially adding a Fe <3+> salt solution and a M<2+> salt solution into the solution B, stirring, enabling reactants to be well mixed and obtaining a solution C; transferring the solution C to a quartz reaction tube of a microwave synthesizer; sealing the solution C, packing the solution C into the microwave synthesizer and conducting a microwave synthesis; when the reaction stops, taking out the reaction vessel and adding the absolute ethyl alcohol; conducting an ultrasonic washing or centrifugal separation on the products; obtaining the superparamagnetism ferrite nano particles after the drying.

The invention discloses a lithium-rich manganese-based anode material for a lithium ion battery, and a preparation method. The preparation process comprises the following steps: (1) metal lithium salt, nickel salt, manganese salt and cobalt salt are dissolved in deionized water and mixed to form a transparent solution, sucrose is added into the transparent solution, the solution is agitated to be transparent and then is heated, agitation is performed continuously for evaporation, water in the solution is removed, so that sol is formed firstly, and gel is obtained finally; (2) the gel is subjected to primary calcination at 500 DEG C-550 DEG C for 2h-4h to remove organic ingredients, and then the gel subjected to primary calcination is subjected to secondary calcination at 800 DEG C-900 DEG C for 15h-20h after being ground, the preparation process is greatly simplified, the temperature, the pH value, the feeding speed and the like of a co-precipitation system are not required to be controlled precisely, the contact between primary particles is improved efficiently, and the rate capability of the material is improved.

Processes for manufacturing a paper product from cellulose pulp, part of which comes from a broke and part of which comes from a fresh pulp are provided. The processes involve first redissolving in a broke pulper, with stirring and in an alkaline medium, cellulose fibers contained in said broke to form a broke pulp. Next, the broke pulp is brought to a concentration and a pH close to that characteristic of the fresh pulp by (1) diluting said broke pulp with a white water and (2) acidifying said broke pulp by injecting carbon dioxide into said broke pulp after the broke pulp has left the broke pulper and before admixing said broke pulp with said fresh pulp. Then the broke pulp is admixed with the fresh pulp to form a pulp mixture and the pulp mixture is dewatered to form a paper product and a white water.

The invention relates to a preparation method of compound electrolyte injection and a compound electrolyte injection composition. The preparation method comprises the following steps of: adding water for injection of which the quantity is 50% as heavy as the quantity of the prescription quantity in a concentrated preparation tank, weighing sodium chloride, sodium gluconate, sodium acetate, potassium chloride and magnesium chloride of which the quantity is equal to the quantity of the prescription quantity and putting into a liquid preparation tank, dissolving in a stirring way, adding 0.1% (g/ml) of active carbon for injection, adsorbing for 15min in a stewing way, removing carbon into a dilute preparation tank in a filtering way, additively adding water for injection to be near to be full dose, evenly stirring, adjusting pH to be within the range from 7.0 to 7.6 by 0.1mol/L of sodium hydroxide, finely filtering by filters with 0.45mum and 0.22mum after an intermediate is detected to be qualified, carrying out light detection till no foreign matters are visible, carrying out split charging according to 500ml of each bag, sterilizing for 15min in a hot-press way under 121 DEG C, printing after the products are detected to be qualified under light, packing, and storing. Every 1000mL of the compound electrolyte injection composition prepared by the preparation method comprises 5.26g of sodium chloride, 5.02g of sodium gluconate, 3.68g of sodium acetate, 0.37g of potassium chloride and 0.30g of magnesium chloride; and the pH value is 6.8-7.4. The toxins, the insoluble particles and the heavy metals in the composition bacterium completely meet the requirements of injection.

The invention discloses an iron removing device and method for a nickel-cobalt raffinate. The iron removing device comprises an oxidation tank, a first-section iron removing tank, a first-section filter press, a second-section iron removing tank, a second-section filter press, an iron removing post liquid tank and a dilution tank, a raffinate inlet is formed in one side of the top of the oxidationtank, a nickel salt or cobalt sale addition port is formed in the other side of the top of the oxidation tank, a liquid outlet of the lower part of the oxidation tank communicates with a liquid inletof the first-section iron removing tank through a pipeline, a liquid outlet of the lower part of the iron removing tank communicates with a liquid inlet of the first-section filter press through a pipeline, and a liquid outlet of the first-section filter press communicates with a liquid inlet of the second-section iron removing tank through a pipeline. The oxidation property of crude nickel hydroxide is utilized, the crude nickel hydroxide is both an oxidant and valuable mineral material in the iron removing process, the zero cost of oxidant consumption in the iron removing process is achieved, meanwhile due to the consumption of acid in the self leaching process, the consumption of a neutralizer used in subsequent neutralization and hydrolysis iron removal is also greatly lowered, and the cost-effectiveness is remarkable.

A detection assembly, a chemical dosing pump, a chemical box, a liquid inlet pipeline, a liquid return pipeline, a chemical dosing pipeline and a PLC control assembly in electric control connection with the chemical dosing pump and the detection assembly are integrated in the movable automatic chemical dosing device. Two ends of the dosing pump are respectively connected with the agent box and the dosing pipeline, and the dosing pipeline is communicated with the membrane unit so as to realize dosing of the agent into the membrane unit; the two ends of the detection assembly are connected with the liquid inlet pipeline and the liquid return pipeline respectively, the liquid inlet pipeline and the liquid return pipeline are both communicated with the membrane unit, the detection assembly is used for detecting the pH value of a cleaning solution in the membrane unit in real time and transmitting a numerical signal to the PLC control assembly, and the PLC control assembly is used for controlling starting and stopping of the dosing pump so as to achieve automatic dosing. The invention further discloses a control method of the device. The device has the advantages of being compact in structure, easy to operate, high in automation degree and the like, the concentration of the cleaning solution is monitored in real time, chemicals are automatically added, and the concentration of the cleaning solution is controlled within a preset range all the time.

The invention discloses dysprosium-ion-doped yttrium-barium phosphate fluorescent powder and a preparation method thereof. The fluorescent powder has the chemical formula shown as follows: Ba3Y(1-x)Dyx(PO4)3, wherein x is selected from 0.001 to 0.2. Y<3+> is substituted with Dy<3+> to obtain yellow green fluorescent powder which is high in crystalline degree, high in light intensity and good in color rendering index. The fluorescent powder can be effectively excitated by ultraviolet light to emit blue light with the wavelength of 480nm and yellow fluorescent light with the wavelength of 573nm and is yellow green fluorescent powder which can be used for white-light LEDs or energy-saving lamps. The preparation method disclosed by the invention is simple and convenient to operate, low in production cost and equipment requirement; the obtained dysprosium-ion-doped yttrium-barium phosphate fluorescent powder is stable in quality; and industrial production is easily realized.

The invention discloses a pretreatment method for neutralizing printing and dyeing waste water. The carbon dioxide which is recovered, purified and liquefied in a chemical engineering garden is used for replacing the waste acid (sulphuric acid) to neutralize high alkalinity printing and dyeing waste water. Liquid state carbon dioxide in a storage tank is introduced into a tubular mixer by a self control feeding system through a vaporizer so as to be mixed with the printing and dyeing waste water; meanwhile, an online pH monitor is arranged in front of a mixing pool; the waste water pH value isfed back to the feeding system for automatically regulating and controlling the carbon dioxide adding quantity. The method has the advantages that the problem of anaerobe sulfur poisoning is relieved; the biochemical treatment efficiency is improved; meanwhile, the treatment cost of the printing and dyeing waste water is reduced; the carbon resource recovery and utilization are promoted.

The invention belongs to the technical field of chemical engineering, and particularly relates to a method for continuously preparing (R)-4-halo-3-hydroxy-butyrate by using a micro-reaction system. Asubstrate solution containing halogenated acetoacetate and a biological catalytic solution are continuously subjected to an enzyme-catalyzed asymmetric reduction reaction in the micro-reaction systemcomposed of a micro-mixer, a micro-channel reactor and a pH regulator so as to obtain the (R)-4-halo-3-hydroxy-butyrate. Compared with the prior art, the method has the advantages that: the reaction time is only a few minutes, the yield of the product (R)-4-halo-3-hydroxy-butyrate is more than 95 percent, the process is continuous, the automation degree is high, the efficiency is high, the technological process is simple and convenient to operate, and the industrial production is easy.

The invention discloses a catalyst for catalyzing ortho-parahydrogen conversion and a preparation method and application thereof, and the preparation method comprises the following steps: (1) dissolving iron salt in water to prepare an iron salt solution; (2) heating the ferric salt solution, adding a weakly alkaline precipitant while stirring, and observing that the precipitation is separated out and the pH value of the precipitation end point is 8-12; (3) cooling the mixed system obtained in the step (2) to room temperature, centrifuging, and discarding supernate; (4) adding water into the precipitate obtained in the step (3), stirring, centrifuging, and discarding supernate; (5) repeating the step (4) for a plurality of times, discarding the supernate when the last time is finished, and not supplementing water; and (6) filtering the precipitate obtained in the step (5) to obtain a filter cake, and drying, roasting and forming the filter cake to obtain the ortho-parahydrogen conversion catalyst. The prepared ortho-parahydrogen conversion catalyst is low in alkali metal ion content, the ortho-parahydrogen catalytic conversion activity is improved, and the ortho-parahydrogen conversion catalyst can be applied to hydrogen liquefaction equipment, liquid hydrogen storage tanks, parahydrogen generators and the like.

The invention belongs to the technical field of dimethyl dichlorosilane purification treatment, and particularly relates to a catalyst for purifying dimethyl dichlorosilane as well as a preparation method and application of the catalyst. The raw materials of the catalyst comprise a palladium-containing compound, an aluminum-containing precursor and a silicon-containing precursor. The catalyst can significantly reduce bond breaking activation energy of silicon-hydrogen bonds, silicon-silicon bonds, carbon-chlorine bonds, carbon-carbon unsaturated silicon-methyl bonds and silicon-chlorine bonds, so that difficult-to-separate substances are converted into easy-to-separate substances. Substances such as chlorine-carbon compounds, unsaturated hydrocarbons and ethylhydrodichlorosilane generate products with higher boiling points than dimethyldichlorosilane, and the products are easy to remove in the subsequent rectification link, so that the purity of the finished dimethyldichlorosilane can be obviously improved, and the influence of impurities in the dimethyldichlorosilane on the quality of downstream products is reduced. The catalyst provided by the invention is good in dispersity, high in activity, high in repeated utilization rate and wide in application range.

The invention provides a technology for treating waste liquid of dacromet, belongs to the technical field of industrial wastewater treatment, mainly relates to a technology for treating waste liquid of dacromet, and aims at solving the problems of low treatment speed of redox reaction and low wastewater recycling rate in electrochemical dacromet wastewater treatment. The technology comprises the following steps: 1, adjusting concentration, namely, adjusting the concentration of dacromet waste liquid to be within the concentration range in which the radox reaction is conveniently carried out; 2, performing radox reaction, namely, sequentially performing oxidization, electrochemical reaction and reduction reaction on the dacromet waste liquid in order to layer the dacromet waste liquid; 3, neutralizing and precipitating, namely, neutralizing the waste liquid; and separating out a precipitation layer; and 4, finely filtering, namely, filtering and finely filtering supernate to obtain clear and transparent recovered water. With the adoption of the technology, the treated wastewater is transparent and high in recycling rate; the treatment cost is low; the social benefit is high; the energy saving and emission reducing effects are obvious.

The invention provides a solution chemistry automatic control device used in the corrosion process of iron and alloy of iron and a use method of the solution chemistry automatic control device and belongs to the field of material corrosion and control. PH and the iron ion/ferrous ion concentration in the corrosion process of iron and alloy of iron can be automatically controlled. The device is composed of a pH control module and an iron ion/ferrous ion concentration control module and mainly comprises ion exchange resin, a flux-stabilized pump, a pH controller, a timing controller, a pH probe, an experimental sample and the like. According to the device, hydrogen ions generated through ion exchange are used for neutralizing hydroxyl ions generated in the corrosion process of iron and alloy of iron, the pH controller is used for controlling on/off of the flux-stabilized pump, and pH can be automatically controlled. Meanwhile, iron ions/ferrous ions generated in the corrosion process are absorbed through ion exchange, the real-time measuring result of the iron ion/ferrous ion concentration serves as a reference, the on/off time ratio of the flux-stabilized pump is adjusted through the timing controller, and the iron ion/ferrous ion concentration can be automatically controlled.

The invention relates to a uniform and stable ceramic precursor sol preparation device which comprises a double-layer reaction kettle, an acid medium storage assembly, pressurization equipment, a condensation pipe, a high and low temperature unit, a suction unit and a circulating cooling assembly, and the double-layer reaction kettle comprises a double-layer reaction kettle inner layer and a double-layer reaction kettle outer layer; an ultrasonic unit, an air injection plate and a stirring unit are arranged in the inner layer of the double-layer reaction kettle; the pressurizing equipment is connected with the inner layer of the double-layer reaction kettle through a pipeline so as to apply pressure to the spinnable ceramic precursor sol in the inner layer of the double-layer reaction kettle and promote the extrusion of the spinnable ceramic precursor sol; the condensation pipe is connected with the inner layer of the double-layer reaction kettle through a pipeline; compared with the prior art, the problems that the stirring is insufficient, the raw materials are not uniformly mixed, the pH value cannot be accurately controlled, and the spinnable ceramic precursor sol cannot be continuously produced by the current gel preparation device are solved.

The invention discloses a preparation method and application of a balsam pear seed oil multilayer emulsion. The preparation method comprises the following steps: preparing a whey protein isolate solution; preparing a pectin-citric acid buffer solution; preparing a chitosan oligosaccharide solution; respectively mixing bitter gourd seed oil and the whey protein isolate solution to obtain a first mixed solution; performing high-speed shearing on the first mixed solution, and homogenizing to obtain a bitter gourd seed oil single-layer emulsion; mixing the bitter gourd seed oil single-layer emulsion with a pectin-citric acid buffer solution; performing high-speed shearing on the second mixed solution to obtain a bitter gourd seed oil double-layer emulsion; mixing the bitter gourd seed oil double-layer emulsion with a chitosan oligosaccharide solution to obtain a third mixed solution; and performing high-speed shearing on the third mixed solution to obtain the balsam pear seed oil multilayer emulsion. The balsam pear seed oil multilayer emulsion is prepared through an electrostatic layer-by-layer self-assembly technology, the bad flavor of balsam pear seed oil can be covered, and the stability of the balsam pear seed oil is improved.