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 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 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.

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 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 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.

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 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 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.