261results about How to "Control pH" patented technology

The biphase anaerobic fermentation process of kitchen refuse to produce hydrogen and methane includes the following steps: 1. sorting kitchen refuse and mixing with water in certain amount; 2. mixing with sludge from sewage treating yard and heat treatment; 3. heat exchange between heat treated mixture and mixture without through heat treatment; 4. anaerobic fermentation of the heat treated mixture in the first phase to produce hydrogen; 5. anaerobic fermentation of the residue from the first phase fermentation in the second phase to produce methane; and 6. using the residue from the second phase fermentation as fertilizer or returning to replace sludge serving as hydrogen producing bacteria source. The process is simple, can recover the biomass energy from kitchen refuse effectively, and has no secondary pollution.

The invention provides coal gasification waste water biochemical treatment equipment and a method. The equipment comprises an anaerobic biochemical treatment unit, an anoxic biochemical treatment unit, a one-grade or multiple-grade aerobic biochemical treatment unit and a membrane biological response unit which are communicated in sequence. In addition, the aerobic biochemical treatment unit is also communicated with the anoxic biochemical treatment unit, and the membrane biological response unit is communicated with the anoxic biochemical treatment unit; each biochemical treatment unit has the characteristics of biochemistry and slurry and water separation integration. The coal gasification waste water biochemical treatment equipment and the method have high COD load and high ammonia nitrogen load and can realize high COD removal rate and high ammonia nitrogen removal rate.

The invention belongs to the field of environmental engineering, and in particular relates to a device and a method for comprehensively treating acidic sulfate organic waste water based on biological desulfurization. The method comprises the following steps of: 1, reducing sulfate in the organic waste water, blowing hydrogen sulfide off, namely (1-1) mixing the acidic sulfate organic waste water and sulfide-containing recirculation water in an anaerobic digestion reactor, controlling the pH of the mixture to be 5.0 to 6.0, and thus obtaining a hydrogen sulfide-containing acidic mixed solution, and (1-2) introducing inert gas, blowing the hydrogen sulfide off, adding sulfate reducing bacteria, reducing the sulfate to form sulfide, obtaining the sulfide-containing recirculation water and returning to the step (1-1); and 2, absorbing, oxidizing and recycling the hydrogen sulfide, namely (2-1) absorbing the hydrogen sulfide blown off in the step (1-2) by using a weak alkaline solution, adding sulfur-oxidizing bacteria, oxidizing the hydrogen sulfide to form elemental sulfur, separating to obtain the elemental sulfur and effluent, and (2-2) treating the effluent for recycling. By the device and the method, sulfate innocent treatment and resource recovery treatment are realized.

The invention discloses a pigment type neutral ink and a production method thereof. The pigment type neutral ink comprises the following raw materials by weight percentage: 15-40% of color paste, 15-40% of wetting agent, 1-3% of pH regulator, 0.1-2.0% of antibacterial bacteriostatic agent, 0.5-5.0% of surfactant, 0.5-3.0% of rheology assistant, 0.1-1.0% of defoamer, 2-10% of resin, 0.1-1.5% of corrosion inhibitor, 0.3-2.5% of lubricant and the balance of de-ionized water, wherein the color paste is a water-based color paste, and the formula of the water-based color paste includes 18-35% of pigment, 1-12% of surfactant, 0.2-3.0% of pH regulator, 0.1-2.0% of antibacterial bacteriostatic agent, 0.05-1.0% of defoamer, 3-15% of wetting agent and the balance of de-ionized water. The pigment type neutral ink has excellent moisture preservation and lubrication properties, and thereby guarantees continuity and fluency of writing; and the pigment type neutral ink is stable in performance and long in quality guarantee period.

The invention provides a refining method of titanium dioxide by-product ferrous sulphate. The method comprises: (1) preparing a ferrous sulfate heptahydrate solution by using the titanium dioxide by-product ferrous sulphate; (2) adjusting a pH value of the solution to 1-2.5, and performing titanium hydrolysis of the titanium dioxide by-product ferrous sulphate; (3) adding iron powder or iron sheets into the ferrous sulfate heptahydrate solution after the titanium hydrolysis, reducing Fe<3+> in the solution, adjusting a pH value of the solution to 6.0-6.5, and performing a magnesium, manganese and zinc precipitation treatment for the titanium dioxide by-product ferrous sulphate; and (4) adding a flocculating agent into the above solution, stirring, standing, settling and filtering to obtain the refined ferrous sulphate solution. The method can effectively remove impurities such as titanium, magnesium, zinc, manganese and other ions in the titanium dioxide by-product ferrous sulphate, and obtain the high-purity refined ferrous sulphate.

The invention provides a preparation method of aluminum oxide whisker in the hydrothermal under low temperature. The preparation method comprises the procedures as follows: aluminum nitrate is dissolved in distilled water to prepare the solution with the concentration of 0.5 to 1.5mol / L; urea with the molar weight that is 2 to 10 times more than the aluminum nitrate is added into the aluminum nitrate solution and the solution is stirred until transparent clarified collosol is made; the collosol is placed in a reaction kettle for 6 to 12h under the temperature of 90 DEG C to 120 DEG C to obtain white deposit of the precursor of the alumina whisker; and the white deposit is washed by the distilled water and roasted for 2 to 12h under the temperature of 1100 DEG C to 1300 DEG C and the alumina whisker is made. The alumina whisker prepared by the invention is identified to be pure phase by x-ray diffraction. The average diameter of the alumina whisker is 0.5mum and the length of the alumina whisker is 5 to 10mum. The alumina whisker can be used as an additive for ceramic materials, function materials and metal materials, and the like, and well improve the mechanical property and the heat-resistant property of the materials.

The invention discloses a salting-out and solvating-out crystallization method for citicoline. The method comprises the following steps: adding inorganic sodium salt which accounts for 1 to 20 percent of citicoline and a solvating agent which is 1.0 to 4.0 times the volume of a staring citicoline aqueous solution to a citicoline aqueous solution with a pH value between 5.0 and 8.0 and a concentration between 10 and 400 g / L; stirring the materials at a rotating speed controlled between 20 and 230 rpm at a temperature of between 10 and 40 DEG C; performing pumping filtration after complete crystallization; washing the obtained product with ethanol; drying the obtained product in vacuum; and obtaining the citicoline sodium salt crystals with the purity higher than 99 percent. The method has the advantages that the method obviously improves the quality of final products, raises crystallization yield stability, can control the particle size of the crystals by changing crystallization temperature or the states of a flow field, and is simple to operate, good in repeatability and suitable for the industrial production of the citicoline.

The invention discloses a preparation method of a sphere-like manganese-rich ternary precursor. The method comprises the following steps: mixing and dissolving nickel sulfate, cobalt sulfate and manganese sulfate to prepare a nickel-cobalt-manganese sulfate mixed solution, adding the nickel-cobalt-manganese sulfate mixed solution and a precipitant solution into a reaction kettle in a parallel flowmanner, adding a complexing agent in a parallel flow manner, controlling the pH value to be 6.8-10.0, the reaction temperature to be 40-80 DEG C and the stirring speed to be 200-800 r / min, and agingthe obtained turbid liquid in the reaction kettle for 5-20 hours after the solution is dropwise added; and after aging is finished, filtering and washing the turbid liquid, and finally, carrying out vacuum drying at 80 DEG C for 10-20 hours to obtain the sphere-like manganese-rich ternary precursor. The sphere-like manganese-rich ternary precursor prepared by the method is good in sphericity degree, narrow in particle size distribution, uniform in particle size, high in tap density, simple in process method and less in pollution.

The invention relates to a method for bioleaching valent metal ions in a waste battery, and belongs to the technical field of harmless treatment and recycling treatment of waste batteries. The method comprises the following steps: recycling electrode material powder containing divalent metal ions from a waste manganese dioxide battery, a waste lithium-ion battery or a waste nickel-metal hydride battery; performing shaking culture on a bioleaching strain in a bioleaching mediums to obtain the biological leachate, when the pH value of the leachate is 0.5 to 2.0, adding the electrode material powder, of which the mass is 2 to 10 percent of the volume of the biological leachate; performing shaking culture, and keeping the pH at 1.5 to 2.5; and finishing bioleaching when the dissolution concentration of the valent metal ions does not increase any longer. Through the adoption of the method, the efficient leaching of the valent metal ions in the waste battery at a 2 percent or more solid-liquid ratio is realized; the effect is obvious; and the method is simple and feasible.

A crystallizing process for 5'-nucleoside-sodium phosphate includes such steps as proportionally adding the inorganic Na salt and solution educing agent, stirring while crystallizing at 15-40 deg.C, filtering, alcohol washing and vacuum drying. It has high output and controllable size of crystal.

The invention provides an alkylation preparation method for aniline intermediate, which comprises the following steps: beating the aniline intermediate expressed by formula (1) in aqueous solution, adding an acid-catching agent, a catalyst and an alkylation reagent into the solution, heating the mixture to between 60 and 105 DEG C by stirring, reacting the mixture for 5 to 18 hours through heat preservation, cooling and crystallizing the reaction solution after the reaction is finished, stirring and filtering the solution, taking a filter cake out, and washing and drying the filter cake to obtain an aniline alkylation product expressed by formula (2). The method has the main following advantages that: (1) quaternary ammonium salt and dispersant used as a mixed catalyst in the method have obvious effect of promoting the reaction, can prevent oil-water demixing, can balance the system after the reaction is finished, and are easy to crystallize; and (2) by adopting the acid-catching agent provided by the method, the pH value can be well controlled and stabilized, the hydrolysis of acyl and halogenated hydrocarbon can be effectively prevented, and the occurrence of side reaction and the consumption of the halogenated hydrocarbon can be reduced; and the cost can be reduced and the cost performance can be improved by using heavy magnesium oxide as the acid-catching agent in particular.

The invention discloses a multifunctional automatic control column leaching experimental facility, belonging to the field of leaching mining. The experimental facility mainly comprises a liquid circulation system, a water circulation system, an air circulation system, an automatic control system and a data collection system. The liquid circulation system is composed of a reaction column, a high-level tank and a liquid receiving tank; the water circulation system is composed of a hot water tank, a solenoid valve, a liquid receiving tank jacket, a reaction column jacket and a high-level tank jacket; the air circulation system is composed of an air compressor, an air flowmeter and a control valve; the automatic control system is used for automatically regulating and controlling the temperature of the leaching system, oxygen solubility and solution flowing; the data collection system can be used for automatically collecting and storing the solution pH value, the oxygen solubility, electric potential, the temperature and other parameters in real time. The experimental facility can be used for performing indoor simulation experiments and semi-industrial scale pilot plant experiments according to heap-leaching field conditions and actual size of mineral particles, effectively simulating the multiphase and multilevel seepage state of ore bulk and a microbiological leaching and biochemical process, and providing basic data for heap-leaching production practice and technological parameter optimization.

The invention relates to a preparation method of a bisphenol monocarboxylic ester compound antioxidant product which mainly used for synthesizing high molecular materials of rubber, polyolefine plastics, engineering plastics and the like. The invention adopts bisphenol compound and fatty acyl chloride as raw materials, triethylamine as acid absorbent, and the aliphatic hydrocarbon as solvent to generate the bisphenol monocarboxylic ester compound antioxidant product by esterification reaction. Suitable process conditions for synthesizing the bisphenol monocarboxylic ester compound are as follows: the mol ratio of the bisphenol compound to the fatty acyl chloride is 1.1-1.3; the mol ratio of the bisphenol compound to the triethylamine is 1:1.3-1.5; the reaction temperature is 60-85 DEG C; and the reaction time is 120-240 minutes. The bisphenol monocarboxylic ester compound antioxidant product is obtained by filtering, separating, crystallizing and refining after the reaction. The invention has the characteristics of simple production process, high product yield, high quality and convenient industrialized production. The obtained white crystallized bisphenol monocarboxylic ester antioxidant product can be used for high molecular materials having high requirements for color.

The invention provides an efficient mechanical topdressing method for rice field in a cold region and relates to a mechanical topdressing method. The invention is mainly used for solving the problems that fertilizer in the existing rice seedling transplanting and fertilizing machine absorbs moisture in a topdressing process, moistened fertilizer can easily block a fertilizer applying pipe and normal mechanical topdressing is difficultly carried out and the problems that topdressing frequency is high and topdressing effect is poor in the traditional topdressing process. The efficient mechanical topdressing method for the rice field in the cold region is realized by the following steps: firstly, preparing a bulk blending fertilizer, wherein the bulk blending fertilizer is composed of a quick-acting nitrogen fertilizer and a controlled release nitrogen fertilizer; secondly, the bulk blending fertilizer is applied when a rice seedling transplanting machine is used for transplanting rice seedlings. According to the efficient mechanical topdressing method for the rice field in the cold region, the quick-acting nitrogen fertilizer and the controlled release nitrogen fertilizer are mechanically topdressed in one step when the rice seedlings are transplanted, the problems that fertilizer absorbs moisture, moistened fertilizer blocks the fertilizer applying pipe and normal mechanical topdressing is difficultly carried out are solved, and the bulk blending fertilizer containing the controlled release nitrogen fertilizer is topdressed in one step, so that the requirement of rice on nitrogen from a rice seedling transplanting period to a mature period is met; meanwhile, fertilizer is applied in one step by adopting the rice seedling transplanting and fertilizing machine, so that fertilization is simplified and efficient. The efficient mechanical topdressing method for the rice field in the cold region is applied to the agricultural technical field.

The invention belongs to the technical field of silica for toothpastes, and particularly relates to silica with low particle size and high dispersion and high transparency for toothpastes and a preparation method thereof. The preparation method comprises the following steps: S1, adding polyethylene glycol to a sodium silicate solution, stirring and dispersing the solution uniformly to obtain a sodium silicate mixed solution; S2, adding a sodium sulfate solution into a reaction tank, starting stirring, and performing heating; S3 under stirring, simultaneously dropwise adding the sodium silicatemixed solution and a sulfuric acid solution, controlling a pH value to 8.5-9.5, controlling a temperature, continuously dropwise adding the sulfuric acid solution after addition of the sodium silicate mixed solution is completed, stopping addition of the sulfuric acid solution when pH is 4.0-5.0 to obtain silica; and S4, performing pressure filtration, washing and spray-drying to obtain silica for toothpastes. The method is simple in process, the prepared silica has small particle size, good dispersion and high light transmittance, and good application in toothpastes is satisfied.

The invention relates to an extraction method of bean dreg protein and a method used for preparing DPP-IV inhibitory peptide with the bean dreg protein. The extraction method comprises the following steps: placing bean dreg suspension mixed by fresh bean dregs and water at the temperature of 30-50 DEG C, taking out the bean dreg suspension when pH is 3.0-5.0, collecting the lowermost layer of bean dreg protein after the suspension is layered, airing the bean dreg protein at room temperature, adding protease to prepare DPP-IV inhibitory peptide crude product powder, and then carrying out membrane separation or column chromatography to further purify to obtain DPP-IV inhibitory peptide pure product. The extraction method of the bean dreg protein is simple, no acid liquor or alkali liquor needs to be added in the preparation process, and pollution on the environment is avoided. For the method for preparing the DPP-IV inhibitory peptide with the bean dreg protein, the process is simple, the cost is low, the inhibitory ratio of the prepared DPP-IV inhibitory peptide is between 4.1% and 93.2%, and the median inhibitory concentration is between 42.70 mug / mL and 2593.64 mug / mL.

The invention provides a catalyst for fatty alcohol amination to prepare amine and a preparation method thereof and belongs to the field of chemical industry. The catalyst comprises a carrier, auxiliaries and active ingredients, the active ingredients include at least one of Ni, Co and Cu and account for 5-50wt% of total weight of the catalyst, and the auxiliaries include at least one of K, Na, Pd, Re, Ru, Cr and B and accounts for 1-10wt% of the total weight of the catalyst. The preparation method includes: adopting water vapor to treat the carrier, drying, and roasting for the first time; impregnating. The catalyst is high in stability, catalytic conversion rate and selectivity and can be used for preparing lower fatty amine.

The invention discloses a preparation technology for multi-process combined printing The preparation technology comprises the following process steps: grey cloth is subjected to whitening, presetting, dyeing, napping, setting, direct printing, drying, aging, washing, reduction clearing, washing, drying and setting, wherein direct printing comprises steps of discharge printing, burnt-out, gold printing and glue pressing; printing paste for discharge printing is prepared from a disperse dye, 5%-10% of a thickener, 1%-3% of a pH regulator, 1%-3% of a levelling agent and water; discharge paste is prepared from paste, 5%-10% of a thickener, 25%-40% of a discharging agent HB, 1%-3% of a reduction protective agent, 1%-5% of a discharge assistant ZB, 1% of citric acid and water; the burnt-out paste is prepared from 5%-15% of a NaOH alkaline agent, 25%-40% of an alkali-resisting paste, 2%-5% of a penetrant and water. Compared with a traditional technology, the preparation technology omits four times of high-temperature drying processes and four times of washing processes, the process steps are reduced greatly, and the prepared fabric feels good and has better three-dimensional sense.

The invention belongs to the technical field of aquaculture, and particularly relates to a breeding method for increasing the survival rate of loaches manually bred in a factory-like mode, wherein the breeding method is reasonable, simple and high in operability. According to the breeding method, the natural mating method, the sperm extrusion method and the laparotomy spermatophore-obtaining method can be adopted, the death rate of parent fish for breeding can be greatly reduced, and the spawning induction rate, the fertilization rate and the hatching rate can be increased.

A ferric salt strengthened electrokinetic remediation device for heavy metal pollution in an e-waste dismantling place is characterized in that a cathode chamber and a ferric salt electrolyte thereof and an anode chamber and a citric acid electrolyte thereof are arranged at two sides of a soil chamber and are separated from the soil chamber through porous partitions wrapped by filter paper, a cation exchange membrane is arranged on a partition between a carbon fiber chamber and the cathode chamber, a cathode pH induction pin and an anode pH induction pin control a cathode pump and an anode pump to add required solutions into the cathode chamber and the anode chamber, a cathode pH control chamber and an anode pH control chamber are arranged to control the pH values of the electrolytes, and an aeration device is arranged on the bottom end surface of the anode chamber to adjust the electrolytes. According to the ferric salt strengthened electrokinetic remediation device, an electrolysis device and an electric control device are combined, the traditional electrodynamics and the cation exchange membrane technology are combined, the frequency of collision between heavy metal pollutants and activated carbon fibers is effectively improved under the action of the electric field, and the remediation efficiency is improved.

The invention discloses a green synthesis method for benzoin. The green synthesis method includes the steps of firstly, putting benzaldehyde and imidazole hydrochloride into a reaction kettle according to the molar ratio ranging from 1:0.003 to 1:0.015, adding absolute ethyl alcohol solvents accounting for, by mass, 60% to 75% of the benzaldehyde, adjusting the pH value of the reaction system to range from 7.8 to 8.5, and conducting reaction for 1.5 hours to 2.5 hours at the temperature ranging from 70 DEG C to 90 DEG C; secondly, after the reaction ends, placing the reaction kettle in the ice-water bath to be processed through crystallization and filtering, obtaining crystallization mother liquor and light yellow solid, washing the light yellow solid through alcohol to obtain white acicular crystals, and conducting drying under the normal pressure to obtain the finished product, namely, the benzoin. By means of the method, traditional virulent editpotassium cyanide catalysts or sodium cyanide catalysts are replaced, and therefore the new green chemical synthesis method capable of reducing by-products is achieved. The method solves the problems that at present, catalysts obtained through synthesis in the industry are high in toxicity or low in toxicity but difficult to synthetise, high in consumption, low in catalysis efficiency and high in production cost.

The invention provides a method of preparing iron oxide yellow by using a titanium dioxide by-product ferrous sulphate, belonging to a field of chemistry. The method comprises refining of ferrous sulphate, neutralization reaction, seed preparation, and oxidation synthesis; and the method controls a pH value of a solution during refining of the ferrous sulphate, and thus effectively removes impurities such as manganese, magnesium and zinc. In addition, by separating a seed preparation process into a neutralization reaction process and a seed preparation process, a preparation process of Fe(OH)2 suspension and an oxidation process are separated, thereby effectively controlling the seed to be spindle-shaped or needle-shaped, and improving dispersibility of the seed. The method is good in impurity removal effects, and can effectively control the seed to be spindle-shaped or needle-shaped and improve dispersibility of the seed; and the prepared iron oxide yellow has advantages of good color and high tinting strength.

The invention belongs to the field of chemical engineering, and aims to provide a process and a device for continuously producing a high-quality N-fatty acyl amino acid salt surfactant, which increasean acyl chloride conversion rate and reduces the content of sodium aliphatate. According to the technical scheme adopted by the invention, the process for continuously producing the high-quality N-fatty acyl amino acid salt surfactant comprises the following steps: (1) separately introducing a reaction material amino acid mixture, acyl chloride, liquid alkaline and circulating recycling materialsinto a mixing device to uniformly mix; (2) cooling the uniformly mixed materials through a heat exchanger, conveying the materials into an amidation post with an overflow hole from the bottom by utilizing a conveying pump, and performing amidation reaction at a proper temperature with a proper pH value; (3) enabling an amidation product to overflow from the overflow hole of the amidation post, introducing one part of the amidation product used as the circulating recycling materials into the mixing device to perform circulating reaction, and heating the other part of the amidation product through a heater, and introducing the heated materials into an ageing machine to perform ageing reaction; and (4) obtaining an aged reaction product, namely a target product N-fatty acyl amino acid salt.

The invention relates to a tissue culture method for rapidly propagating wild lilies and belongs to the field of a flower culture technology. According to the method, bud-stage flower stems of the lilies are used as explants of tissue culture of the lilies and are completely disinfected before culture; besides that 6-BA (Benayl Aminopurine), NAA (Naphthalene Acetic Acid) and IBA (Indole Butyric Acid) are used as auxins or hormones in a culture medium, an MES (Methyl Ester Sulfonate) is added to be used as a buffering agent so as to effectively control the pH value in a tissue culture process, and the pH value is maintained in the optimal range of differentiation, propagation and growth of the lily explants; therefore, the induction efficiency and the propagation coefficient are improved, the induction rate is 98%-100%, the quantity of adventitious buds induced by each explant is not less than 15, the propagation coefficient is 5-7, the rooting rate is 100%, and the root system is healthy and strong. The tissue culture method is applicable to safe propagation of good single plants of filial generations and is an effective manner for protecting wild resources of lilies.

The invention discloses a cultivation medium capable of increasing the yield of big clitocybe and a preparation method thereof. The cultivation medium comprises nutrient media and cover-soil materials of which the weight ratio is 2-3 to 1; the nutrient media are prepared from, by weight, 60-70 parts of mulberry twig stalk powder, 15-20 parts of tea tree dregs, 8-12 parts of sheep manure, 5-8 parts of bran, 3-6 parts of corn powder, 2-4 parts of phosphorus fertilizer, 0.5-1.5 parts of lime, 1-2 parts of plaster and 0.5-1.5 parts of derris powder; the cover-soil materials are prepared from, by weight, 25-30 parts of fine soil, 12-15 parts of sucrose silt, 2-3 parts of sodium selenite and 1-2 parts of bacillus thuringiensis. The cultivation medium is rich and comprehensive in nutrient, the nutritional requirement of growth development of the big clitocybe can be met, and the cultivated big clitocybe is large in size, high in growth velocity and high in disease resistance; compared with a conventional cultivation medium, mushrooms are picked about 10 days in advance, and the yield is increased by about 20 percent. The raw materials of the cultivation medium are wide and easy to obtain, the cost is low, the production process is simple, and the cultivation medium is suitable for large-scale cultivation of the big clitocybe.

The invention provides a water lettuce culture method. The water lettuce culture method comprises the specific steps of preparation before sowing, seed treatment, sowing, seedling stage management, planting and water culture management. The water lettuce culture method effectively improves the germination rate and disease resistance of seeds, can make the survival rate of transplanted lettuces above 92% and make the growing lettuces reach a best state by effectively controlling potential of hydrogen, temperature, moisture, lighting, nutrients, air and other conditions in the lettuce growing process, the problems of long lettuce growth time, low survival rate, susceptible plant diseases and insect pests, high production cost and the like are solved, and rapid industrialized planting is achieved.

The invention provides a pharmaceutical naloxone hydrochloride composition for injection and a preparation method of the pharmaceutical naloxone hydrochloride composition. In the prescription, trehalose is used as an excipient, and a certain quantity of fumaric acid is added, so that the pH value of a product can be controlled within a reasonable range, meanwhile, the degradation of naloxone hydrochloride in a storage process can also be avoided, and the stability of the product is greatly improved; in addition, the process is easy to operate, and the prepared product is full in appearance, stable in quality and relatively good in dissolvability and compatible stability.

The invention provides a method for treating and fresh-keeping sciaenops ocellatus by using acidic electrolyzed water and belongs to the technical field of preservation of aquatic products. The method comprises the following steps of: 1) pre-treating the sciaenops ocellatus; 2) carrying out spraying treatment by using the acidic electrolyzed water; 3) carrying out immersing treatment by using the acidic electrolyzed water; 4) carrying out freezing point injection treatment; 5) packaging in vacuum; and 6) preserving at an ice temperature. According to the method for treating and fresh-keeping the sciaenops ocellatus by using the acidic electrolyzed water, disclosed by the invention, the kill ratio of common bacteria on the surface of the sciaenops ocellatus is more than 99%; and the freshness degree, the flavor and the texture of the sciaenops ocellatus can be guaranteed to the greatest extent within 40-50 days.

The invention provides a gasoline deposited carbon remover, and a preparation method and a use method thereof. The gasoline deposited carbon remover comprises a buffer reagent, a compound surfactant, a solubilizer, a dispersant, an antirust agent and an aromatic, and the buffer reagent is sodium carbonate and sodium bicarbonate. Compared with removers in the prior art, the remover adopting the sodium carbonate and sodium bicarbonate buffer reagent as a cleaning active component has the following advantages: the pH value can be effectively controlled, so material corrosion caused by too large alkalinity is avoided; the buffer reagent is combined with the surfactant, the solubilizer, the high-efficiency dispersant, the antirust agent and the aromatic, so gasoline deposited carbon of parts are effectively removed; and the gasoline deposited carbon remover is suitable for removing deposited carbon of various components, and also has the characteristics of wide application range, simple operation, good deposited carbon removal effect, low cost and small toxicity.

The invention discloses a preparation method for a high-density nickel hydroxide doped precursor. The preparation method comprises the following steps: preparing stable complexing solutions by respectively adding ammonium hydroxide into nickel salt, cobalt salt and doped saline solutions; mixing the stable complexing solutions, thereby acquiring a stable mixed solution; adding the mixed solution,a sodium hydroxide solution and air flow into a reaction kettle for continuous coprecipitation reaction; realizing the continuous preparation of the high-density nickel hydroxide doped precursor by controlling system temperature, concentration, pH value, reaction time, and the like. The high-density nickel hydroxide doped precursor acquired according to the invention is high in degree of crystallinity; nickel, cobalt and doped metals in the product are uniformly mixed; control on the specific area and grain size of the precursor can be realized; the process is simple and feasible; the preparation method is suitable for large-scale industrial production.