Tungsten(VI) chloride
Tungsten(VI) chloride
CAS: 13283-01-7
Molecular Formula: Cl6W
Tungsten(VI) chloride - Names and Identifiers
Tungsten(VI) chloride - Physico-chemical Properties
| Molecular Formula | Cl6W |
| Molar Mass | 396.56 |
| Density | 3.52g/mLat 25°C(lit.) |
| Melting Point | 275°C(lit.) |
| Boling Point | 347°C(lit.) |
| Flash Point | 346°C |
| Water Solubility | soluble organic solvents such as ethanol [HAW93] |
| Solubility | Soluble in carbon disulfide, carbon tetrachloride and phosphorus oxychloride. |
| Vapor Presure | 43 mm Hg ( 215 °C) |
| Appearance | powder |
| Color | Gray to dark gray-blue |
| Exposure Limit | ACGIH: TWA 3 mg/m3NIOSH: TWA 5 mg/m3; TWA 1 mg/m3; STEL 10 mg/m3; STEL 3 mg/m3 |
| Sensitive | Moisture Sensitive |
| Physical and Chemical Properties | Tungsten hexachloride is a compound of tungsten and chlorine, chemical formula WCl6, appearance appears dark blue or blue purple fine crystal powder, soluble in carbon disulfide, soluble in ether, ethanol, benzene, carbon tetrachloride, easy to be decomposed by hot water, tungsten oxychloride or tungsten oxide is generated by oxidation by oxygen in the air during heating, and WCl6 containing tungsten oxychloride is easily decomposed by water vapor, and is reduced by hydrogen under high temperature conditions to precipitate tungsten powder. tungsten hexachloride (WCl6) is a new material, which can be used for tungsten purification and organic synthesis, or tungsten plating by vapor deposition, and can also be used in chemical industry, or used in the glass industry, mainly in the production of surface coatings. |
| Use | Used as a spectral purity reagent |
Tungsten(VI) chloride - Risk and Safety
| Hazard Symbols | C - Corrosive |
| Risk Codes | R34 - Causes burns R29 - Contact with water liberates toxic gas R22 - Harmful if swallowed |
| Safety Description | S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S36/37/39 - Wear suitable protective clothing, gloves and eye/face protection. S45 - In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.) S8 - Keep container dry. |
| UN IDs | UN 3260 8/PG 2 |
| WGK Germany | 3 |
| RTECS | YO7710000 |
| FLUKA BRAND F CODES | 1-10-16 |
| TSCA | Yes |
| HS Code | 28273990 |
| Hazard Class | 8 |
| Packing Group | II |
Tungsten(VI) chloride - Reference Information
| EPA chemical substance information | information provided by: ofmpeb.epa.gov (external link) |
| Main purpose | for tungsten plating by vapor deposition; For the preparation of single crystal tungsten wire, glass surface conductive layer; as olefin polymerization catalyst; For the purification of tungsten and organic synthesis; Widely used in agriculture, chemical industry, petroleum catalysis and smart glass and other industries. |
| preparation method | researchers have proposed a preparation method of high purity tungsten hexachloride, which requires the following steps: pretreatment of raw materials, crude tungsten hexachloride, tungsten hexachloride refining, condensation receiving and tail gas treatment. The first step: pretreatment of raw materials. Screening or sintering to obtain large particles of tungsten powder (>75um), chlorine gas through the purification and preheating, temperature rise to 600-1000 ℃, screening large particles of activated carbon (>75um) through high temperature chlorine atmosphere for dehydration, deoxidation treatment. The molar ratio of tungsten powder, chlorine gas and activated carbon is 100 :( 300-600):( 1-20). Second step: crude tungsten hexachloride. The large particle tungsten powder and 80%-95% purified high temperature chlorine gas were reacted at the bottom of the chlorination furnace, and the chlorination temperature was 600-1000 ° C., and the generated tungsten hexachloride and tungsten chloride impurities were discharged as steam through the gas outlet. Step 3: Refining of tungsten hexachloride. The treated activated carbon is filled in the refining furnace, and the steam generated by the chlorination furnace and 5%-20% of the purified high-temperature chlorine gas are refined in the refining furnace at 600-1000 ℃, tungsten oxychloride and low-valent tungsten chloride in the steam are reduced to tungsten hexafluoride to obtain refined Steam. Step 4: condensation reception. The refined Steam enters the receiver, and the temperature of the cooling water is controlled at 30-250 ℃, High-purity tungsten hexachloride powder was obtained, and the exhaust gas was discharged. Step 5: tail gas treatment. The tail gas is absorbed by the sodium hydroxide solution in the tail gas absorption tank, and the tail gas is purified and discharged. |
| safe operation | the chemical properties of six tungsten chloride is very active, in the case of humid air will be violent reaction, gaseous hydrogen chloride having a pungent odor and a substance having a strong oxidizing property are emitted. Therefore, it is necessary for the relevant practitioners to be familiar with the safety technical measures for the use of six tungsten chloride. 1. When using tungsten hexachloride in open barrels, be sure to wear protective clothing, chemical safety goggles, gas masks and protective gloves, and use a special barrel opener to open the barrel. 2. In order to ensure the quality of the product, please tighten the lid quickly after each use, so as not to reduce the activity of the remaining products in the barrel and affect the subsequent use. 3. The skin damaged by the product should be quickly rinsed with plenty of water for more than 15min, or with 3% sodium bicarbonate solution. In severe cases, the patient should seek medical treatment promptly. |
| Use | used as a spectral purity reagent tungsten hexachloride is an important raw material for the application of new materials, the latter can catalyze the displacement reaction of paraffin 1-and 2-octene, promote 1, 3-dithiopentane (1,3-dithiolanes) and 1,3-dithiane (1,3-dithiane) conversion to chlorides dihydro-1,4-dithiins and dihydro-1,4-dithiepines |
| production method | 1. Prepared by reacting metallic tungsten powder with dry chlorine gas at 500~600 ℃. It is used for vapor deposition tungsten plating, preparation of single crystal tungsten wire, glass surface conductive layer and as olefin polymerization catalyst. 2.100g of tungsten trioxide WO3 and 1L of hexachloropropane were placed in a 2L round bottom flask, connected to a reflux condenser with a drying tube, and heated with sufficient stirring until the tungsten trioxide was completely reacted and dissolved, which took about 4 hours. After cooling, black crystals were formed, and the crystals were filtered out with a glass filter in a drying oven, washed with dried carbon tetrachloride, and then pumped by a vacuum pump with a trap for 1H or more to remove all organic solvents. The product should be sealed for storage. In the same manner, vanadium trichloride, niobium pentachloride, molybdenum pentachloride and the like can also be synthesized. 3. The metal tungsten powder is placed in a quartz reaction tube, and the reaction is carried out at 1000 ° C. While chlorine gas is introduced into the reaction tube, so that the target product is sublimed and precipitated in the cold part of the reaction tube. If you want to produce a large amount of this product, you can directly connect the crude reaction tube and the large type of receiver, and then between the electric furnace and the receiver, wrapped with asbestos and nickel chromium wire, heating time is not more than 350 degrees Celsius, the product then accumulates near the outlet of the reaction tube. Such as chlorine to flow in about 300mL/min, 8h can be 500g products. Before and after the reaction, it is extremely important that the air and chlorine in the reaction tube and the receiver are completely replaced with an inert gas. When mixed with oxygen or moisture, it is easy to produce tungsten oxychloride WOCl4 (red, melting point 21 ° C., boiling point 228 ° C.) and WCl2O2 (yellow, melting point 266 ° C.). If the above-mentioned by-products are mixed in the target product, they can be removed by heating because they are more volatile than tungsten hexachloride. However, when the temperature is higher than the boiling point of tungsten hexachloride (346 ° C.), decomposition of the target product is caused. If the raw material is pure, and not mixed with oxygen or moisture, the finished product is also very pure. |
Last Update：2024-04-10 22:29:15
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