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144 results about "Potassium hydride" patented technology

Potassium hydride, KH, is the inorganic compound of potassium and hydrogen. It is an alkali metal hydride. It is a white solid, although commercial samples appear gray. A powerful base that is useful in organic synthesis, it is also a dangerously reactive compound. For this reason it is sold commercially as a slurry (~35%) in mineral oil or sometimes paraffin wax to facilitate dispensing.

Amphipathic three block copolymer and its preparation method and application

InactiveCN101265312AEvade captureAvoid the effect of adsorptionPharmaceutical non-active ingredientsPolyesterPolymer science
The invention relates to a polyethylene glycol/aliphatic polyester/cationic polymer amphiphilic triblock copolymer. The copolymer contains a hydrophilic non-ionic polymer block, a hydrophobic block and a pH-sensitive cationic polymer block. Potassium hydride is taken as an initiator, the polyethylene glycol and the aliphatic polyester monomers and the cationic monomer are sequentially added in a polymerization reactor for respective reaction, methanol is added for terminating the reaction; n-hexane is used for the precipitation and the purification of the triblock copolymer in tetrahydrofuran, the precipitation is repeated for 3 times, and a product undergoes the vacuum drying. The copolymer can form a micelle or a nanoparticle by self-assembly in a water medium, wherein, a core of a loading hydrophobic drug is formed by clustering the hydrophobic cationic polyester block, the polyethylene glycol block is assembled into a hydrophilic shell, thus having the functions of stabilizing the micelle and effectively avoiding the capture and protein absorption of a reticuloendothelial system of an organism; the cationic polymer block can be further acted with DNA, protein, peptide and other biological macromolecules, thus forming the biodegradable and pH-sensitive drug-loading polymer micelle or the nanoparticle which can be further dispersed,.
Owner:TIANJIN UNIV

Aqueous phase preparation method of ZnSe/ZnS core-shell structure quantum dots

The invention discloses an aqueous phase preparation method of ZnSe/ZnS core-shell structure quantum dots. The aqueous phase preparation method comprises the following steps of: A, preparing KH4Te solution, namely preparing by reducing tellurium powder with sodium borohydride; B, respectively weighing potassium borohydride and selenium powder and adding into a test tube with a stopper, adding high purity water into the test tube, and plugging the stopper to obtain colorless and transparent liquid, namely selenium potassium hydride; C, weighing zinc acetate crystals and reduced glutathione respectively, and dissolving in anaerobic high purity water; D, adding the selenium potassium hydride under the condition of stirring at the speed of 150 to 300 revolutions/min and continuously introducing high purity argon, adjusting a pH value of the solution by using sodium hydroxide solution, and mixing; and E, packaging in a polytetrafluoroethylene digestion tank, and performing microwave heating, wherein a molar ratio of KH4Se to Zn(Ac)2.2H2O to the reduced glutathione is (1/15-1/10):1:(1.6-1.8). The preparation process of the quantum dots is easy, and is high in biocompatibility and fluorescent quantum yield, heavy metal ion toxicity is avoided, fluorescence labeling can be performed on organisms without the aftertreatment process, and process parameters are easy to control.
Owner:WUHAN UNIV

Preparation method of ZnSe/ZnS core-shell quantum dots

The invention discloses a preparation method of ZnSe/ZnS core-shell quantum dots through illumination assisted room-temperature synthesis. The method comprises the steps of: A. preparing a potassium hydrogen selenide solution by reducing selenium powder with potassium borohydride; B. weighing zinc acetate crystals, which is then dissolved in deionized water to a constant volume, thus obtaining a zinc acetate solution; C. adding quantitative thioglycolic acid into the zinc acetate solution; D. adjusting the solution to a specific pH value with a sodium hydroxide solution; E. after introducing an inert gas for deoxygenation, adding the potassium hydrogen selenide solution; F. placing the stock solution or a diluted solution of the mixed solution under an ultraviolet light for radiation for a certain period of time, and conducting detection with fluorescence spectrum analysis; and G. adding isopropyl alcohol for purification, then carrying out drying by a freeze drier so as to obtain ZnSe/ZnS core-shell quantum dot solid powder, which is dissolved in a PBS solution or deionized water before using, thus obtaining a ZnSe/ZnS core-shell quantum dot solution. The method of the invention has the advantages of simple process, easily controllable technological parameters, as well as cheap raw materials. The synthesized ZnSe/ZnS core-shell quantum dots are free of heavy metal ions, and can be used for biological labeling and imaging.
Owner:WUHAN UNIV

Treatment method and treatment system for ammoniated pelleting compound fertilizer tail gas

The invention discloses a treatment method and a treatment system for ammoniated pelleting compound fertilizer tail gas. The tail gas treatment method provided by the invention comprises the following steps of: simultaneously adding phosphoric acid and tail gas in a drying working section to a venturi tube; using phosphoric acid to wash ammonia in the tail gas; emptying the tail gas, and punching washing liquid into a pelleting working section, so as to react with pelleting tail gas in a pelleting working section venturi tube; performing secondary water washing due to high ammonia content in the pelleting tail gas; emptying the tail gas after ammonia content of the tail gas is qualified; and punching the washing liquid into a potassium hydride process to reuse. The tail gas treatment system provided by the invention comprises a drying tail gas working section and a pelleting tail gas working section. Ammonia discharge amount of the tail gas is reduced to be 20 kg per hour from 50-60 kg per hour, thereby being greatly lower than a national emission standard; the ammoniated pelleting compound fertilizer tail gas is discharged after reaching the standard, thereby reducing complaints from surrounding residents and creating a good social benefit; absorbed ammonia can be recycled, so that ammonia consumption is reduced, and production is more stable; the washing liquid is recycled without waste liquid, and is economical and practicable.
Owner:山东聊城鲁西化工第五化肥有限公司

Method for microwave-assisted preparation of CdTeSeS/ZnTe core-shell quantum dot in water

The invention relates to a method for microwave-assisted preparation of a CdTeSeS / ZnTe core-shell quantum dot in water. The method comprises the following steps: 1) preparing a sodium elenosulfate solution; 2) preparing a cadmium chloride solution; 3) adding mercaptopropionic acid into the cadmium chloride solution; 4) adjusting the pH value of the solution; 5) dissolving a sodium tellurite crystal in the solution and simultaneously adding potassium borohydride and the sodium elenosulfate solution; 6) subjecting a mixture obtained in the step 6) to heating reaction in a microwave digestion furnace; 7) carrying out cooling to room temperature and adding isopropanol for purification so as to obtain CdTeSeS quantum dot gel; and 8) preparing a mixed solution of the cadmium chloride solution, the mercaptopropionic acid and the sodium tellurite crystal, dissolving the CdTeSeS quantum dot gel in the mixed solution anew, adding potassium borohydride and successively carrying out heating reaction in the microwave digestion furnace, cooling to room temperature, addition of isopropanol for purification and drying with a lyophilizer so as to obtain solid powder of the CdTeSeS / ZnTe core-shell quantum dot. The method is fast and simple and has easily controllable technological parameters and a low price; and the synthesized quantum dot has uniform particle size distribution, high stability, high fluorescence quantum yield and wide emission spectrum.
Owner:天门市天宝化工科技有限公司

Carbon-loaded nano bismuth composite material, preparation method and application thereof

The invention discloses a carbon-loaded nano bismuth composite material, a preparation method and application thereof. The method comprises the following steps: mixing metered citric acid, bismuth nitrate pentahydrate, tartaric acid and water, uniformly stirring, transferring the obtained mixed solution into a hydrothermal kettle, putting the hydrothermal kettle into a drying oven, controlling thereaction temperature to be 150-220 DEG C and the reaction time to be 4-12 hours, naturally cooling the hydrothermal kettle, taking out the content in the hydrothermal kettle, washing with water, anddrying to obtain the carbon-loaded nano bismuth material, wherein the mass ratio of the citric acid to the bismuth nitrate pentahydrate to the tartaric acid to the water is 1:(0.02-0.1):(0.1-1):(2-10). According to the method, the technological process is simplified, the production cost is reduced, the nano bismuth particles in the prepared composite material are uniformly dispersed, potassium borohydride can be effectively catalyzed to reduce p-nitrophenol, and the composite material has high catalytic activity and good repeatability and has potential utilization value in the aspect of sewagetreatment.
Owner:XUZHOU UNIV OF TECH

Preparation method for CdHgTe/CdS core-shell quantum dot

The invention provides a preparation method for a CdHgTe / CdS core-shell quantum dot. The preparation method comprises the following steps: A, preparing a potassium tellurium hydride solution which is prepared by reducing tellurium powder through potassium borohydrate; B, weighing a certain proportion of cadmium chloride and mercuric chloride crystal, dissolving the mixture with deionized water, and performing metered volume to obtain a mixed solution of cadmium chloride and mercuric chloride; C, adding quantified thioglycolic acid into the mixed solution; D, adjusting the solution with a potassium hydroxide solution to enable the solution to have a specific pH value; E, after inert gas is introduced for oxygen removal, adding the new prepared potassium tellurium hydride solution; F, irradiating through a UV light, and detecting through fluorescence spectrum analysis; G, adding isopropanol for purification, and drying through a freezer dryer to obtain CdHgTe / CdS core-shell quantum dot solid powder. According to the preparation method, the process is relatively simple; process parameters are easy to control; raw materials are inexpensive, the synthesized quantum dot is small in particle size and relatively uniform in particle size distribution, and the fluorescence quantum yield is relatively high.
Owner:湖北荆楚理工资产经营管理有限公司

Preparation method of high molecular polyethylene polyamine polyether used for preparing water-based functional liquids

The invention discloses a preparation method of high molecular polyethylene polyamine polyether used for preparing water-based functional liquids. The method adopts polyethylene polyamine and a mixture of propylene oxide and ethylene oxide as raw materials, and employs sodium hydride or potassium hydride as a catalyst to conduct a polymerization reaction so as to obtain the high molecular polyethylene polyamine polyether used for preparing water-based functional liquids. The invention preferably selects a two-step polymerization method as the preparation process. And the prepared high molecular polyether has the characteristics of high molecular weight, narrow distribution and high viscosity, etc., thus being suitable to be used for preparing hydraulic liquids, quenching liquids, and cutting fluids, etc. And the prepared water-based functional liquids have especially outstanding thickening property, viscosity-temperature property and shearing resistance, thus having prolonged service life. The average molecular weight of the high molecular polyether prepared by the method of the invention can reach 30000-35000, 40000-45000, 50000-55000, 60000-65000, 70000-75000, and 80000-90000, the molecular weight distribution coefficient MW/MN is 1.4-1.9, the viscosity range at 100DEG C can be 20000-50000mm<2>/s, and the viscosity-temperature index can be up to 240-260DEG C.
Owner:大连广会科技有限公司

Method for preparing fatty boric acid by utilizing isopropoxyboric acid pinacol ester

The invention discloses a method for preparing fatty boric acid by utilizing isopropoxyboric acid pinacol ester. The method comprises the steps of adding a Grignard reagent dropwise in isopropoxyboric acid pinacol ester under the temperature condition of subzero 5 DEG C to 0 DEG C, stirring for 1-2 hours at the room temperature, adding a potassium bifluoride aqueous solution dropwise into a reaction liquid, stirring for 2-3 hours at the room temperature, adding silica gel, stirring for 2-3 hours at the room temperature, filtering, and extracting a water layer by an organic solvent A; adding an organic solvent B into an organic layer, filtering again, adding a nonpolar hydrocarbon solvent into the filtrate for pulping, and filtering to obtain organic boric acid. The method has the advantages of simplicity and convenience in operation, safety, environmental protection, lower cost and higher yield, is an appropriate method for preparing fatty boric acid, and is suitable for the industrial production; and further, the raw materials are easy to obtain.
Owner:DALIAN NETCHEM CHIRAL TECH

Hydrogen storage alloy type hydrogenation catalyst and preparation method thereof

The invention provides a hydrogen storage alloy type hydrogenation catalyst and a preparation method thereof. The hydrogen storage alloy type hydrogenation catalyst product is M1Ni3.7Co0.6Mn0.3Al0.4 (M is mixed rare earth). The method comprises the processes of prefabrication and activation of the hydrogen storage alloy type hydrogenation catalyst, wherein the prefabrication process is to smelt alloy raw materials for designing the counterweight of compositions under the protection of argon gas atmosphere, and to perform heat treatment, quenching and milling on the alloy raw materials; and the activation process is to add an alkaline solution of potassium borohydride or sodium borohydride into prefabricated hydrogen storage alloy type hydrogenation catalyst powder, to heat the mixture to obtain a treatment liquid, to add solid potassium borohydride or solid sodium borohydride into the treatment liquid, and to perform temperature rise, filtration and drying to obtain the activated hydrogen storage alloy type hydrogenation catalyst product. The yield of a reaction product obtained from the hydrogen storage alloy type hydrogenation catalyst during hydrogenation reaction at a temperature of 200 DEG C is improved from 2.6 percent to 65.6 percent.
Owner:兴化市正阳水泥有限公司

Method for aqueous phase synthesizing stable GSH-CdTeSe alloy quantum dots

Disclosed is the method of synthesizing stable GSH-CdTeSe alloy quantum dot in water phase. Biological small molecular glutathione (GSH) is used as stabilizer and complexing agent in water solution; inorganic salt CdCl2 is added to the solution; tellurium potassium hydride (sodium) solution and selenium potassium hydride (sodium) solution prepared by the reaction of potassium borohydride (sodium) and tellurium powder or selenium powder are injected to the solution under the protection of inert gas; and then the heating reflux is processed to generate the soluble GSH-CdTeSe alloy quantum dot; the GSH-CdTeSe alloy quantum dots with different particle diameter and adjustable spectrum through the control of the reflux time and the composition. The preparation method has the advantages of convenient operation, low cost and strong operability. The obtained soluble GSH-CdTeSe alloy quantum dot is purified and dried, and then is dissolved in Tris-HCl buffer solution (pH=7.4); the synthesizing method of the GSH-CdTeSe alloy quantum dot has high dot production rate and high stability.
Owner:NANKAI UNIV

Green synthesis method of tetravalent manganese ion activated fluoride red luminescent material

The invention discloses a green synthesis method of a tetravalent manganese ion activated fluoride red luminescent material. The synthesis method comprises the following steps: adding potassium hexafluoromanganate into a fluosilicic acid solution or a fluotitanic acid solution until the potassium hexafluoromanganate is completely dissolved to obtain a solution 1, adding potassium fluoride, potassium bifluoride or barium chloride into water until the potassium fluoride, potassium bifluoride or barium chloride is completely dissolved to obtain a solution 2, the molar concentration of the potassium fluoride, potassium bifluoride or barium chloride in the solution 2 is 0.25-3.00 mol/L, and stirring to obtain a solution 3; mixing and stirring the solution 1 and the solution 2 to obtain a solution 3, centrifuging the solution 3 to obtain a precipitate, and washing and drying the precipitate to obtain a final product, namely the tetravalent manganese ion activated fluoride red luminescent material. The synthesis method provided by the invention has the advantages of greenness, environmental protection (no hydrofluoric acid), mild conditions (normal temperature, normal pressure and aqueous solution reaction), high synthesis speed (several minutes) and the like, and is convenient for large-scale industrial preparation.
Owner:INST OF RESOURCES UTILIZATION & RARE EARTH DEV GUANGDONG ACAD OF SCI
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