144 results about "Potassium hydride" patented technology

The invention relates to synthesis of organic compounds, and provides a method for preparing potassium trifluoroborate series compounds. The method comprises the following steps of: adding organic boric acid or organic borate and solvent (THF (tetrahydrofuran), or MTBE (Methyl Tertiary Butyl Ether), or ethyl acetate, or methanol) into a reaction kettle lined with tetrafluoroethylene plastic at room temperature; adding potassium bifluoride and water at normal temperature, stirring for 1 to 12 hours, and reacting to prepare a solid-liquid mixture; adding solid potassium ion containing inorganic or organic alkali into the solid-liquid mixture after the reaction is completed, neutralizing until the pH is between 7 and 9, and continuously stirring for 1 to 5 hours; directly filtering to obtain a solid coarse product after stirring is completed; dissolving the coarse product with solvent, filtering and concentrating, adding nonpolar solvent, and pulping to obtain high-quality RBF3K series compounds. The method is easy to operate, has mild reaction conditions, and can realize scale-up production; and the product prepared by the method has high yield and excellent purity, and the cost is greatly reduced.

The invention discloses a water-retaining agent improving alfalfa drought tolerance and a preparation method thereof. The water-retaining agent comprises, by weight, 60-80 parts of starch-grafting acrylate particles, 20-30 parts of organic fertilizer particles, 5-10 parts of soil ameliorant particles and 15-20 parts of ceramsite. The organic fertilizer particles comprise 100-150 parts of livestock excrement, 30-50 parts of humic acid, 20-40 parts of straw, 40-60 parts of bagasse, 10-20 parts of peanut meal, 5-10 parts of sawdust and 5-10 parts of fishbone powder. The soil ameliorant particles comprise 0.25-0.3 part of ammonium molybdate, 0.1-0.2 part of potassium borohydride, 0.05-0.08 part of boronic acid, 0.05-0.08 part of borax, 0.1-0.2 part of ferrous sulfate, 0.3-0.4 part of ammonium ferrous sulfate, 1-2 parts of zinc sulfate, 0.05-0.1 part of manganese sulfate, 0.2-0.3 part of monopotassium phosphate, 0.2-0.4 part of sodium selenate and 5-8 parts of photosynthetic bacterium inoculants. The ceramsite is obtained by mixing and forging attapulgite, biological sludge, vermiculite powder and river bottom mud.

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.

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.

The invention provides a method for synthesizing gold-doped fluorescent quantum dots, which performs water phase synthesis on a cadmium salt, a compound of gold, a mercury salt, a sulfhydryl compound and newly-prepared tellurium potassium hydride under an anaerobic condition at the temperature of between 90 and 130 DEG C to obtain CdnAuxTez and near infrared CdnAuxHgyTez gold-doped fluorescent quantum dots. The gold-doped fluorescent quantum dots synthesized by the method are slightly poisonous, have strong fluorescence signals, have an emission spectrum positioned at visible and near infrared light, contain the gold element, and can be used for performing analytical studies correlative with a gold nano material; and the wavelength can be adjusted according to the proportion of componentsand the reaction time. The method dopes gold which has no bio-toxicity into semiconductor quantum dots to improve the biological compatibility of the quantum dots and reduce the nano-toxicity. The method can be applied in the fields of biological analytic detections, biomedical imaging and the like.

The invention discloses a novel compound with a structure shown in the specification, wherein R is H, F or methoxyl. The novel compound is prepared by a method comprising the following steps: performing hydrosilylation by taking oxabenzonorbornadiene and dimethylphenylsilane as standard substrates and [Rh(COD)Cl]2 as a metal catalyst to obtain a product A; reacting the product A with tetrabutyl ammonium fluoride, cumyl hydroperoxide and potassium hydride to remove a silicon substrate so as to generate alcohol B; and reacting the alcohol B with benzyl bromide or benzyl chloride with different substituent groups under the action of alkali to obtain a target product. The invention further relates to a weeding composition comprising the novel compound, and also relates to an application of the novel compound particularly used for controlling weeds in useful plant crops.

The invention belongs to the technical field of uranium conversion electrolysis fluorine production, and particularly relates to an electrolysis fluorine production waste electrolyte recovery method.The method comprises the following steps: (1) dissolving a waste electrolyte; (2) carrying out pH adjustment; and (3) carrying out crystallization of potassium bifluoride. Dissolving and filtering canbe adopted to obtain a clear electrolyte dissolved solution, copper is removed, the pH value is controlled to be 10 to 12, and is adjusted to be 3 to 4 before crystallization, the recovered electrolyte with indexes similar to those of newly purchased electrolyte can be prepared. Through research, alkaline wastewater and acidic wastewater treated by an electrolytic cathode can be used for dissolving the waste electrolyte, and the ion product of potassium bifluoride during electrolyte crystallization can be increased by adjusting the pH value.