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

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 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.

The invention discloses a p-type delafossite structure CuScO 2 Crystal material and its preparation method and application, the method comprises: step 1, preparation of reaction precursor: with Cu 2+ Source reactants and Sc 3+ The source reactant is used as the raw material, deionized water is used as the reaction liquid, and the reducing agent and mineralizing agent are added and stirred until completely dissolved to prepare the reaction precursor; step 2, the reaction precursor is subjected to hydrothermal treatment at 210-240°C After reacting for 12 to 48 hours, the reaction product was centrifuged to obtain a precipitate, and the precipitate was dried to obtain the p-type delafossite structure CuScO 2 crystal material. The present invention utilizes the single reaction of hydrothermal method to prepare gram-level CuScO 2 Crystal material, no need to adjust the pH value of the precursor reactant; and the present invention explores CuScO for the first time 2 As a catalyst material in electrolytic water oxygen evolution, it shows good electrolytic water oxygen evolution activity and stability under alkaline conditions.

The invention discloses a method and device for potential-controlled reinforced gold leaching. The method comprises the steps of (1), adding a gold-containing material and water into the potential-controlled reinforced gold leaching device, and air is guided into the solution for carrying out slurrying treatment while stirring is carried out; (2), adjusting the pH value after the slurrying treatment is finished, adding thiourea into the solution, guiding the air into the solution to control the oxygen dissolution amount in the solution, adding ferric sulfate into the solution, carrying out potential-controlled reinforced leaching, and discharging the material after the reaction is finished; and (3), after material sedimentation and filtration separation, carrying out harmless stockpiling on tailings, wherein a pregnant solution is subjected to metal replacement filtration to obtain gold mud, and the tail liquid can be returned to the slurrying process for recycling after being simply treated. The invention further discloses the device for potential-controlled reinforced gold leaching. The method can be used for realizing efficient leaching of gold in sulphide ore gold ore and gold concentrate ore which are difficult to treat, and is a cyanide-free green gold extraction method which is high in speed, non-toxic and insensitive to impurities.

The invention relates to the technical field of heat-not-burn tobacco products, in particular to a method for preparing heat-sensitive non-burn tobacco sheets based on sulfate lignin. The method comprises the following steps: adding tobacco powder, essence and lignin into the pulp suspension, decomposing and filtering to obtain a fiber base material; hot pressing the fiber base material to obtain a non-combustible tobacco sheet. The invention adds lignin in the sheet preparation process. On the one hand, the lignin can be used as an adhesive, which reduces the use of other chemical adhesives and maintains the natural flavor of the tobacco sheet. On the other hand, the chemical bonds of lignin are broken at high temperature, causing the adhesive lignin itself and the fibrous tissue structure of the sheet to become relatively loose, so that the flavor wrapped or absorbed in it can be released, so that the flavor of the finished tobacco product is fully released when smoked , improve suction comfort.

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 relates to the field of sterilization and disinfection and particularly relates to acid oxidation potential sterilization water with fine control on a pH value and a preparation method of the acid oxidation potential sterilization water. The preparation method comprises the following steps of: (1), providing an A unit capable of generating hydrogen ions; (2), proving a B unit containing active chlorine; (3), providing a C unit with a pH value control function; and (4), mixing the A unit, the B unit and the C unit in use to obtain an acid solution with strong oxidizing property, wherein the pH value of the acid solution with strong oxidizing property ranges from 2 to 7, the oxidation-reduction potential of the acid solution with strong oxidizing property ranges from 800mV to 1300mV, and the active chlorine content of the acid solution with strong oxidizing property ranges from 30mg / L to 3000mg / L. Compared with the prior art, the preparation method ensures that the sterilization water has the properties of acid oxidation potential water, can be used for accurately controlling the pH value of the sterilization water through regulating the volume of the sterilization water, and especially can be used for accurately controlling the pH value of the sterilization water in a subacidity range of 5-7.

The invention provides a method for refining long chain dicarboxylic acid in an n-alkane fermentation solution. The method comprises: subjecting a pretreated fermentation solution and an acid solution to heat exchange by a microchannel heat exchanger respectively, rapidly mixing them to complete an acidification reaction in a microchannel heat exchanger-integrated microchannel reactor under the conditions of 15-90DEG C and 0.001-10sec, then carrying out curing for 1-60min and making the product cool to room temperature, and finally performing filtration, washing as well as drying, thus obtaining long chain dicarboxylic acid powder with ultra-high purity. The microchannel heat exchanger-integrated microchannel reactor consists of an upper cover plate, a lower cover plate, and a mixed reaction unit as well as a heat exchange unit that are stacked layer upon layer between the upper cover plate and the lower cover plate. The method provided in the invention can obtain a high-purity product with a nitrogen content less than 30ppm, and the technological process has the advantages of continuity, easy control, simplicity, employment of a microreactor technology, no amplification effect, convenience for industrial application, low production cost, and strong repeatability of results.