AMMONIUM TUNGSTEN OXIDE
AMMONIUM METATUNGSTATE
CAS: 12028-48-7
Molecular Formula: H4NO40W12(-5)
AMMONIUM TUNGSTEN OXIDE - Names and Identifiers
AMMONIUM TUNGSTEN OXIDE - Physico-chemical Properties
| Molecular Formula | H4NO40W12(-5) |
| Molar Mass | 2864.08 |
| Density | 4[at 20℃] |
| Melting Point | 100°C (dec.)(lit.) |
| Water Solubility | Soluble in water. Insoluble in alcohol. |
| Solubility | H2O: 0.1g/mL, clear, colorless |
| Appearance | Powder |
| Color | white |
| Physical and Chemical Properties | Ammonium metatungstate is a white crystalline powder, soluble in water, insoluble in alcohol, and the aqueous solution is weakly acidic. |
| Use | Uses it to produce tungsten catalyst, widely used in petroleum hydrocracking, lubricating oil hydrogenation, desulfurization, denitrification; Also used in various metal products surface coating, cemented carbide, etc. |
AMMONIUM TUNGSTEN OXIDE - Risk and Safety
| Hazard Symbols | Xn - Harmful |
| Risk Codes | R22 - Harmful if swallowed R41 - Risk of serious damage to eyes R52/53 - Harmful to aquatic organisms, may cause long-term adverse effects in the aquatic environment. |
| Safety Description | S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S39 - Wear eye / face protection. S60 - This material and its container must be disposed of as hazardous waste. |
| UN IDs | 2-41-52/53 |
| WGK Germany | 2 |
| TSCA | Yes |
AMMONIUM TUNGSTEN OXIDE - Reference Information
| EPA chemical information | Information provided by: ofmpub.epa.gov (external link) |
| use | tungsten catalyst is made from it, which is widely used in petroleum hydrocracking, lubricating oil hydrogenation, desulfurization and denitrification. It is also used for surface coating of various metal products, hard alloy, etc. |
| production method | neutralization method uses ammonium paratungstate and nitric acid as raw materials to prepare ammonium metatungstate: ammonium paratungstate is added to deionized water and ammonium citrate to prepare slurry containing WO 312% ~ 30% concentration. According to ammonium paratungstate: nitric acid = 1:20, 3% ~ 5% dilute nitric acid is added into ammonium paratungstate slurry, the solid-liquid ratio is controlled to 1:(3~4), the Ph value is controlled to 2~4, the relative density of the solution is heated to 1.18~1.20, the relative density of the solution is heated to 80~90 ℃, the Ph value is controlled at constant temperature and volume, the reaction is stirred for 4 hours, the aging is controlled for several hours, the clear liquid is concentrated to WO3 content is about 50%, filter to remove insoluble matter, the clear liquid continues to be concentrated, cooled and crystallized, and dried to 80 ℃. Tungstate acid method dissolves tungstic acid with ammonia water, adds deionized water filled with boiling, heats ammonia by ammonia under stirring, makes Ph = 8, adds acetic acid under the condition of solution boiling, then uses dilute nitric acid to adjust the Ph value of 2~4, and continues to heat and concentrate to a relative density of 1.5~2, stop heating, cool and filter. The filtrate is fully stirred with ethanol, filtered after settling, and the crystals are dried and crushed at 80 ℃ to obtain the product. Ammonium metatungstate is prepared from ammonium paratungstate by thermal decomposition method: ammonium paratungstate and a small amount of citric acid catalyst are fully mixed, put into a far infrared rotary furnace, and the thermal decomposition temperature is controlled to 200~280 ℃ for about 1 h. At this time, some ammonia and water were removed, and the weight loss rate of ammonium paratungstate was 5% ~ 6%. The product after thermal decomposition immediately into slurry, add appropriate amount of ammonia water, adjust the Ph value in the range of 3~4, and boil the slurry at 90 ℃. After evaporation and concentration to ammonium metatungstate content of 50%, it can be sold as a liquid product. When evaporation and concentration to the original volume 20%, it can be crystallized, filtered and separated, and granulated to obtain the product. The evaporative concentrate can also be prepared by spray drying. If ammonium 45% ~ 50% metatungstate passes through a high-speed centrifugal turntable spray dryer, the inlet hot air temperature is 250~300 ℃, and the outlet temperature is 90~95 ℃, the obtained product is spherical crystal with a particle size of 200 mesh accounting for 95% and containing free water <1.5%. The solvent extraction method uses the organic extractant bis (2-ethylhexyl) phosphate (D2EHPA) or tributyl phosphate (TBP) and kerosene solvent to form an organic phase of the ammonium tungstate solution, and extracts the ammonium ions in the ammonium tungstate to reduce the Ph value to 2~4, and the ammonium metatungstate solution is generated by boiling. Concentrated crystallization, filtration separation, drying to produce products. Ammonium metatungstate was prepared by ion exchange method using ammonium paratungstate as raw material: ammonium paratungstate was heated at 130~140 ℃ for 1~8 h, the product was mixed into slurry, and boiled at 80~100 ℃ for 2~6 h to generate ammonium metatungstate solution. The product is then concentrated and crystallized, filtered, separated and dried. Its electrodialysis method uses ammonium tungstate or ammonium paratungstate as raw material to prepare ammonium metatungstate through electrodialysis: ammonium paratungstate is added to the anode chamber. When the current passes through, ammonium ions enter the cathode chamber through the anion exchange membrane, The concentration of ammonium metatungstate in the anode chamber increases. Finally, ammonium metatungstate solution is released from the cathode chamber, and ammonium metatungstate is prepared according to the above method. Neutralization method, tungstic acid method and thermal decomposition method are the main methods of industrial production in China. |
Last Update：2024-04-10 22:29:15
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