36 results about "Sodium aluminum hydride" patented technology

Provided is a process for producing a high-purity pyridine compound from a crude pyridine compound that contains a diazine compound as an impurity, the method including a reaction step of reacting the crude pyridine compound with an aluminum hydride compound, and a distillation step of distilling the product obtained from the reaction step. The aluminum hydride compound preferably contains one or more compounds selected from lithium aluminum hydride and sodium aluminum hydride.

The invention belongs to the technical field of oil exploitation, and relates to a hydrogenation heat gas chemical yield increasing solution component capable of increasing permeability of a shallow well and a near wellbore region. The solution component comprises first solution and second solution, the mass ratio of the first solution to the second solution is 1:1, the first solution comprises 37-43% of ammonium nitrate NH4NO3, 23-26% of urea CO(NH2)2, 5-8% of decaborane B10H14, 1-2% of glucose C6H12O6, 0.5-1.5% of methenamine (CH2)6N4 and 19.5-33.5% of water. The second solution comprises 44-48% of sodium nitrate NaNO3, 15-20% of sodium nitrite NaNO2, 17-21% of sodium aluminum hydride NaAlH4 and 15-19% of tetrachloroethylene C2Cl4. By the aid of the solution component, porosity of an ore bed can be increased, accordingly, permeability is increased, and the yield can be increased by 2-10 times.

The present invention relates to the method of reducing aromatic heterocyclic carboxylic ester to form alcohol. Aromatic heterocyclic carboxylic ester 5-methylol thiazole and 3-methylol pyridine are reduced with bis(2-methoxyoxethyl) sodium aluminum hydride as the reductant to obtain corresponding alcohol. Bis(2-methoxyoxethyl) sodium aluminum hydride has excellent dissolvability and this makes it possible to select solvent according to the reduced matter. Bis(2-methoxyoxethyl) sodium aluminum hydride has excellent heat stability, is stable at temperature up to 140 deg.c, will not burn spontaneously in the air and thus is safe. Bis(2-methoxyoxethyl) sodium aluminum hydride and the reduced matter 5- thiazolyl ethyl formate and 3-pyridyl ethyl formate can be dissolved well in arene, cheaper than tetrahydrofuran and easier in separation.

The invention discloses sodium aluminum hydride and rare earth-nickel base alloy composite hydrogen storage material consisting of sodium aluminum hydride and rare earth-nickel base alloy. The mass percent of the rare earth-nickel base alloy is between 5 and 35 percent and the balance being sodium aluminum hydride; wherein the rare earth-nickel base alloy has a chemical general expression of RENi5, and RE in the general expression can be La, Ce, Pr, Nd, Y, Ml or Mm. The preparation method for the sodium aluminum hydride and rare earth-nickel base alloy composite hydrogen storage material is ahigh-energy ball milling method. The preparation method is simple. The prepared sodium aluminum hydride and rare earth-nickel base alloy composite hydrogen storage material has good activation hydrogen storage performance and hydrogen discharging kinetics, and a reversible hydrogen storage capacity of above 3.7 weight percent without adding a special catalyst. The composite hydrogen storage material can be applied to miniature mobile phones, laptops, the hydrogen supply sources of independent galvanic pile systems, the field of hydrogen purification, and the like.

The invention belongs to the technical field of oil exploitation, and particularly relates to a hydrogenation heat gas chemical yield increasing solution component capable of being used for increasing productivity of a low-permeability sandstone reservoir oil well. The solution component comprises first solution and second solution, the mass ratio of the first solution to the second solution is 1:1, by the mass sum of 100%, the first solution comprises nitric acid cholamine complex HOCH2CH2NH2*HNO3, ammonium nitrate NH4NO3 and water H2O, and the second solution comprises hydrazine nitrate N2H4*HNO3, sodium hydride NaH, sodium aluminum hydride NaAlH4 and tetrachloroethylene C2Cl4. Gas released in reaction of the first solution and the second solution can carry heat and enter air holes and micro-cracks of near wellbore region rock strata through a well-cased perforating area, the near wellbore region rock strata can generate new cracks under continuous heat shock action of high-temperature high-pressure gas, oil-gas seepage channels are communicated, seepage resistance is decreased, drainage area is increased, and accordingly, permeability of the near wellbore region rock strata is improved.

A method for reducing a malonate having the formula R1R2C(CO2R3)(CO2R4) to a diol having the formula R1R2C(CH2OH)2 comprising treating said malonate with sodium aluminum hydride.

The invention relates to an improvement on the hydrogen storage material, especially providing a high-capacity coordinated sodium aluminum hydride storage material which is impure with transition metal. Said hydrogen system is formed by basic material, catalyst, and auxiliary structure. In the doping process, it directly uses transition metal as catalyst, and adding alkali metal / alkali hydride or alkaline earth metal / alkaline earth hydride as auxiliary structure at the same time; and processing ball grinding under inertia gas protection or reactive hydrogen gas. The invention has the advantages that: the method is simple, with easy operation and lower cost, while it can solve the problems of traditional techniques which will generate inertia by-product and foreign gas; and provided system has high capacity of hydrogen and high cycle stability. The actual hydrogen capacity can reach 4.7wt% in some system which is increased 40% than present ones.

The invention relates to a method for purifying electron-grade hydrogen chloride. The method comprises the following steps: carrying out ion exchange between highly basic polystyrene macroporous ion exchange resin with sodium aluminum hydride NaAlH4 to generate an aluminum hydride resin adsorbent; loading 1-butyl-3-methylimidazolium tetrafluoroborate ionic liquid, so that the performances of adsorbing hydrogen, carbon dioxide and other impurities are improved.

The invention relates to a nanometer catalyst for aluminum sodium hydride complex hydrides, as well as a preparation method and application thereof. The chemical formula of the catalyst is TixC1-x, wherein x is between 0.2 and 0.8. A method for preparing the catalyst comprises the following steps: according to the stoichiometric ratio of TixC1-x, simple-substance Ti and C powder are mixed, cold-pressed, molded, sintered, diffused and sintered in argon, cooled with a furnace, ground and ball-milled in a vibrating ball mill so as to obtain TixC1-x catalyst ultrafine powder. When the catalyst isused for reversibly-stored hydrogen of aluminum sodium hydride, the catalyst has good catalytic performance and can improve the capacity of the reversibly-stored hydrogen of the aluminum sodium hydride by more than 4.5 percent in weight. The catalyst has the advantages of simple preparation process, low cost and good activity and stability.

The invention relates to a method for producing polycrystalline silicon by utilizing a sodium fluosilicate byproduct of a phosphate fertilizer. The sodium fluosilicate byproduct of the phosphate fertilizer is subjected to paralysis to form silicon tetrafluoride and sodium aluminum hydride, which serve as raw materials to prepare silane, and the silane is cracked to form the polycrystalline silicon and hydrogen, wherein the hydrogen is circulated and used for hydrogenating sodium aluminum tetrafluoride. A hydrofluoric acid byproduct generated in the reaction process is used for producing fluoride salt products. In the method for producing the polycrystalline silicon, the byproduct is taken as a raw material, the price is low, the process is simple, easy to operate, environment-friendly andenergy-saving; the produced polycrystalline silicon has low impurity content and high purity; in addition, the hydrofluoric acid byproduct in the production can be used for producing the fluoride salt products, so that the production cost is further reduced, and the method has better economic, social and environmental benefits.

The invention discloses a lithium borohydride / alkali metal aluminum hydride / calcium carbide composite hydrogen storage material and a preparation method thereof and belongs to the technical field of hydrogen storage materials. The composite hydrogen storage material is prepared from lithium borohydride, alkali metal aluminum hydride and calcium carbide, wherein the mole ratio of lithium borohydride to alkali metal aluminum hydride is 2:1, the additive amount of calcium carbide is 12-25mol%, and alkali metal aluminum hydride is lithium aluminum hydride or sodium aluminum hydride. During preparation, calcium carbide with the purity not lower than 97% is ground into powder with the granularity smaller than 500 mu m, lithium borohydride, alkali metal aluminum hydride and the calcium carbide powder are weighed in proportion and mixed, and finally, the mixed powder is subjected to ball-milling treatment through a planetary ball mill. The composite hydrogen storage material has the advantages as follows: a preparation process of the composite hydrogen storage material is simple, safe and reliable, the composite hydrogen storage material has low hydrogen desorption temperature, high hydrogen desorption and good reversible hydrogen reabsorption performance, the hydrogen storage performance of the material is improved through calcium carbide, raw materials are widely sourced, and the cost is low.