Ammonium perrhenate
Ammonium perrhenate(VII)
CAS: 13598-65-7
Molecular Formula: H4NO4Re
Ammonium perrhenate - Names and Identifiers
| Name | Ammonium perrhenate(VII) |
| Synonyms | Ammonium perrhenate AMMONIUM PERRHENATE Ammonium perrhenate(VII) Rhenium standard solution PERRHENIC ACID AMMONIUM SALT ammonium oxido(trioxo)rhenium (beta-4)-rhenate(reo41-ammonium hydroxy(trioxo)rhenium ammoniate |
| CAS | 13598-65-7 |
| EINECS | 237-075-6 |
| InChI | InChI=1/H3N.H2O.3O.Re/h1H3;1H2;;;;/q;;;;;+1/p-1/rH3N.HO4Re/c;1-5(2,3)4/h1H3;1H |
| InChIKey | XPSXHXWHJAIQJR-UHFFFAOYSA-M |
Ammonium perrhenate - Physico-chemical Properties
| Molecular Formula | H4NO4Re |
| Molar Mass | 268.24 |
| Density | 3.97g/mLat 25°C(lit.) |
| Melting Point | decomposes at 365℃ [HAW93] |
| Water Solubility | miscible |
| Appearance | Powder |
| Specific Gravity | 3.97 |
| Color | White |
Ammonium perrhenate - Risk and Safety
| Risk Codes | R8 - Contact with combustible material may cause fire R36/37/38 - Irritating to eyes, respiratory system and skin. |
| Safety Description | S17 - Keep away from combustible material. S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S36 - Wear suitable protective clothing. S24/25 - Avoid contact with skin and eyes. |
| UN IDs | UN 1479 5.1/PG 2 |
| WGK Germany | 1 |
| RTECS | VI0710000 |
| TSCA | Yes |
| HS Code | 28053090 |
| Hazard Class | 5.1 |
| Packing Group | II |
Ammonium perrhenate - Reference Information
| NIST chemical information | information provided by: webbook.nist.gov (external link) |
| EPA chemical substance information | information provided by: ofmpeb.epa.gov (external link) |
| rhenium compound | ammonium homochenate is also known as ammonium perocephate, commonly known as ammonium biphate. A white hexagonal cubic bicrystal Crystal, molecular formula NH4ReO4, molecular weight 268.242, decomposition before melting point, relative density of 3.97. Rhenium is the formation of a large number of salt compounds, but also the most widely used rhenium compounds. Preparation Method: saturated with ammonia perrhenium acid solution, or in high rhenate barium solution to add ammonium sulfate or ammonium carbonate solution can be obtained. Purposes: used as an oxidant, can also be rhenium tungsten wire raw materials. |
| rhenium | rhenium is a rare high melting point metal, which is an element in the sixth period of the periodic table. Element symbol Re, atomic number 75, relative atomic mass 186.207. Dense block metal rhenium is silver-white. Physical properties: Rhenium's melting point second only to carbon and tungsten, density, boiling point in all the first element, resistivity than tungsten 3 times. Rhenium hardness, high mechanical strength, has good plasticity, easy to draw wire rolling at room temperature, but can not withstand hot processing. Chemical properties: powder rhenium stable in room temperature air, heating easy to burn, at higher than 873K temperature will be intense oxidation into Re2O7. The bulk rhenium is also stable at room temperature and is oxidized to form volatile Re2O7 when heated to a temperature of 1273K. Rhenium and hydrogen, nitrogen, carbon does not react, but the powder can absorb hydrogen. Rhenium reacts with sulfur vapor to form ReS2, and its reaction rate accelerates with the increase of temperature. In an oxygen-free atmosphere, the heated rhenium can react with fluorine, chlorine and bromine to form the corresponding halides ReF6, ReF7, ReCl3, ReCl5 and rebr3. Compounds: Rhenium compounds are numerous, divided into inorganic rhenium compounds, rhenium metal cluster compounds and organic rhenium compounds. Inorganic rhenium compounds include oxides, perrhenium acids and salts thereof, sulfides, halides, and carbon-based compounds. There are 8 kinds of oxides such as ReO4, ReO7, ReO3, Re2O5, ReO2, Re2O3, ReO and Re2O, among which Re2O7, ReO3 and ReO2 are more stable. The perrhenate HReO4 and its main salts are potassium perrhenate, sodium perrhenate, calcium perrhenate and ammonium perrhenate. The rhenium sulfides are Re2S7, ReS3, ReS2, Re2S3 and ReS, of which only Re2S7 and ReS2 are more stable. FIG. 1 is a main inorganic rhenium compound. |
| preparation of solid ammonium performate | preparation method of rhenium compound for producing solid ammonium performate from ammonium performate solution or perrhenate solution. The ammonium perrhenate solution is prepared by rhenium solvent extraction and rhenium ion exchange, and the high rhenium acid solution is obtained by preparing the high rhenium acid. The main preparation methods of ammonium homoleate are crystallization method and ion exchange-crystallization method. Ammonium homoleate is mainly used for the preparation of metal phosphonium powder. The crystallization method utilizes the principle that the solubility of high ammonium ferrite decreases when the temperature is lowered, and makes it crystallize out from the solution and separate from the impurities. The crystallization operation is generally carried out by first concentrating the ammonium homoleate solution to a concentration of 1/3 to 1/4, followed by cooling to a crystallization temperature below 273K. Under these conditions, ammonium homoleate crystallized from the solution. Liquid-solid separation was performed after completion of crystallization. The obtained crystals were dissolved with aqueous ammonia, and the solution was cooled to crystallize. This is repeated 2 to 3 times, can be obtained in the purity of more than 99% of high ammonium ferrite products. The dissolution and crystallization are repeated many times, and the product with a purity of more than 99.99% can be prepared. The crystallization method is cumbersome to operate, the yield of rhenium is low, and it is rarely used in industry. Ion exchange-crystallization method first uses the cation exchange method to prepare pure rhenium acid solution, and then use ammonia or ammonia to neutralize the solution to pH 8~9, so that the rhenium acid is converted into ammonium gallate: The ammonium homoleate solution was concentrated to saturation and cooled to a crystallization temperature of 273K. Under these conditions, ammonium homoleate crystallized from the solution. The obtained ammonium homoleate crystals were filtered, dried at a temperature of 373-393K for 3-4H, and turned once every 20-30min during the drying process to prevent agglomeration. Using this method, the high ammonium phosphinate is pure white, the particle size is less than 0.18mm, the purity is more than 99.99%, potassium, sodium, calcium, cadmium, beryllium, manganese, iron, magnesium, aluminum, titanium, the content of impurities such as copper, cobalt, barium, molybdenum, lead, tin, nickel and platinum is 5 × 10-4% or less. This is a commonly used method in the industry. |
Last Update：2024-04-10 22:29:15
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