Sodium hydride 7646-69-7 large in supply 60% CAS NO.7646-69-7

physical and chemical properties sodium hydride belongs to ionic crystals, salt compounds in which the hydrogen is negative monovalent ions. when heating, it is unstable, decomposition without melting, hydrolysis reaction of sodium hydride with water to prepare sodium hydroxide and hydrogen.
pure sodium hydride is silver needle-like crystals, commercially available sodium hydride merchandise usually is subtle gray crystalline powder, the proportion of sodium hydride is 25% to 50% dispersed in oil. the relative density is 0.92. sodium hydride is crystalline rock salt type structure (lattice constant a = 0.488nm), and as lithium hydride in ionic crystalline, hydrogen ion is existent in anion form. heat of formation is 69.5kj · mol-1, at the high temperature of 800 ℃, it decomposes into metallic sodium and hydrogen. sodium hydride can react severely with water, lower alcohols, may cause a fire or explosion. in the wet air, it can automatically cause a fire. it is dissolved in molten sodium hydroxide, insoluble in liquid ammonia, benzene, carbon disulfide, carbon tetrachloride. sodium hydride reacts liquid ammonia to prepare sodium amide at moderate temperatures.
under the high temperature, although hydrogen reacts directly with sodium metal to prepare sodium hydride, but mineral oil such as kerosene is used in the industry, the dispersing agent is added like anthracene, sodium metal is suspended therein, and reacts with high-pressure hydrogen to prepare sodium hydride. product was washed with hexane, and dried in a stream of nitrogen, sealed in an inert gas for storage or processed intactly in paraffin oil.
reaction formula
sodium hydride is mainly used as a metal chloride reducing agent, reducing agent in organic synthesis, hydrogenation agent, condensing agent, when used as a reducing agent, most of which was suspended in oil, when encountered on skin, it is best to rinse with plenty of water.
the above information is edited by the chemicalbook of yan yanyong.
related chemical reaction sodium hydride is a strong reducing agent, for example, titanium tetrachloride can reduced to metallic titanium at 400 ℃: ticl4 == 4nah + ti + 4nacl + 2h2.
at atmospheric pressure and heated to 425 ℃, it decomposes to generate hydrogen gas. and it can violently react with water, even causes a fire, and produces sodium hydroxide and hydrogen. it reacts with liquild ammonia to prepare amine salt (sodium amide) and hydrogen. nah + nh3 - (h2) → nanh2 + h2.
at a high temperature, sodium hydride also reacts with halogen, sulfur vapor, sulfur dioxide and carbon dioxide. it is highly reductive, liberates the metal from metal oxides, metal chlorides.
ticl4 + 4nah → ti + nacl + 2h2.
sodium hydride reacts with boron trifluoride to generate diborane.
2bf3 + 6nah → b2h6 + 6naf.
sodium hydride is stable in dry air below 230 ℃, over this temperature it will burn into sodium oxide. if there is the presence of trace amounts of sodium, even at low temperatures it is also easy to fire. when firing, water and organic fire extinguishing agent must not be used.
uses sodium hydride can be used for condensation and alkylation reaction and can be used as a polymerization catalyst, used for the manufacture of drug synthetic and used in fragrance industry, used for manufacturing boron hydrides, used as metal surface rust, reducing agents, condensing agent, desiccant and clay johnson's reagents.
used as a condensing agent, an alkylating agent and a reducing agent, etc.
it is an important reductant for pharmaceutical, perfumes, dyes, but also as a drying agent, an alkylating agent, etc.
category water-contacted combustible goods
explosive hazardous characteristics encountering water or moist air to emit hydrogen and can be explosive
flammability hazard characteristics encountering water or moist air to emit hydrogen and can be combustible
storage characteristics treasury ventilation low-temperature drying, stored separately from oxidants, halogens, strong acids.
extinguishing agent dry powder , dry sand, dry powder
chemical properties grey solid
general description a silvery to whitish powder or slurry in oil. used to make other chemicals.
air & water reactions highly flammable. ignites or explodes in contact with air of high humidity [bretherick 1979 p. 107]. reacts violently with water producing a caustic solution (naoh) and hydrogen (h2). heat of reaction may ignite the hydrogen.
reactivity profile sodium hydride is a powerful reducing agent. attacks sio2 in glass. ignites on contact with gaseous f2, cl2, br2, and i2 (the last at temperatures exceeding 100°c), especially in the presence of moisture, to form hf, hcl, hbr, and hi [mellor 2:483 1946-47]. reacts with sulfur to give na2s and h2s [bretherick 1979 p. 107]. can react explosively with dimethyl sulfoxide [chem. eng. news 44(24):7 1966]. reacts vigorously with acetylene, even at -60°c [mellor 2:483 1946-47]. spontaneously flammable in fluorine. reaction with dimethylformamide, when heated, runs away [chem. eng. news, 1982, 60(28), 5]. initiates a polymerization reaction in ethyl-2,2,3-trifluoropropionate such that the ester decomposed violently [bretherick 5th ed. 1995]. presence in the reaction of diethyl succinate and ethyl trifluoroacetate, has twice caused explosions [chem. brit., 1983, 19, 645].
health hazard solid: will burn skin and eyes. harmful if swallowed.
fire hazard flammable. may explode on contact with water. accidental contact with water used to extinguish surrounding fire will result in the release of hydrogen gas and possible explosion.
sodium hydride preparation products and raw materials
preparation products 6-(1h-pyrazol-1-yl)nicotinonitrile-->n-(4,6-dimethylpyrimidin-2-yl)-n-methylbenzene-1,4-diamine-->2-(tetrahydro-pyran-4-yl)-ethanol-->cyclooctanone-->5-fluoro-2-methylbenzothiazole-->temafloxacin-->sarafloxacin-->ofloxacin-->5-fluoro-2-oxindole-->(6-(1h-pyrazol-1-yl)pyridin-3-yl)methanol-->5-bromo-2-ethoxy-pyrimidine-->1-benzyl-2-imidazolecarboxylic acid-->(r)-(-)-benzyl glycidyl ether-->spermidine-->ethyl 3-aminobenzofuran-2-carboxylate-->4-(trimethyl-ureido)-benzenesulfonyl chloride-->3-(3,5-dimethyl-pyrazol-1-yl)-propylamine-->4-hydroxy-2-methylpyrimidine-->3-amino-2,2-dimethyl-1-propanol-->4-bromo-pyran-2-one-->3,5-dimethyl-3h-imidazole-4-carboxylic acid ethyl ester-->n-methyl-6-(1h-pyrazol-1-yl)nicotinamide-->7-methyl-1,6-octadiene-->cis-9-tetradecenyl acetate-->sertaconazole nitrate-->methyl 3-amino-4-methylthiophene-2-carboxylate-->2 , 4-bis(benzyloxy)-5-bromopyrimidine-->1-boc-4-hydroxy-4-(hydroxymethyl)-piperidine-->ethyl 4-methoxy-3-oxo-butanoate-->6-(1h-pyrazol-1-yl)nicotinic acid-->furo[2,3-b]pyridine-2-carboxylic acid, 3-amino-, ethyl ester (9ci)-->2,2-dimethylcyclohexanone-->1-benzyl-2-methyl-1h-imidazole-->methyl cedryl ether-->methyl 6-(1h-pyrazol-1-yl)pyridine-3-carboxylate-->3,5-difluorophenylacetic acid-->tptz-->flosequinan-->croconazole-->methyl nicotinoylacetate
raw materials methanol-->sodium-->hydrogen-->orthoboric acid