Magnesium bromide (MgBr2)
Magnesium bromide
CAS: 7789-48-2
Molecular Formula: Br2Mg
Magnesium bromide (MgBr2) - Names and Identifiers
| Name | Magnesium bromide |
| Synonyms | finechemical Magnesiumbromid UNII-2VC6P60SLN Magnesium bromide magnesium dibromide magnesiumbromide(mgbr2) Magnesium bromide (MgBr2) Hydrobromic acid magnesium salt |
| CAS | 7789-48-2 |
| EINECS | 232-170-9 |
| InChI | InChI=1/2BrH.Mg/h2*1H;/q;;+2/p-2 |
Magnesium bromide (MgBr2) - Physico-chemical Properties
| Molecular Formula | Br2Mg |
| Molar Mass | 184.11 |
| Density | 3.72 g/mL at 25 °C (lit.) |
| Melting Point | 711 °C (lit.) |
| Boling Point | 1248.47°C (estimate) |
| Water Solubility | g/100g H2O: 100.6 (25°C), 125.4 (100°C); solid phase, MgBr2 ·6H2O [KRU93] |
| Appearance | Powder |
| Specific Gravity | 3.72 |
| Color | off-white |
| Merck | 13,5681 |
| Stability | hygroscopic |
| Use | Used as oxidation catalyst, pharmaceutical intermediates, etc |
Magnesium bromide (MgBr2) - Risk and Safety
| Hazard Symbols | Xi - Irritant |
| Risk Codes | 36/37/38 - Irritating to eyes, respiratory system and skin. |
| Safety Description | S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S36 - Wear suitable protective clothing. |
| WGK Germany | 1 |
| HS Code | 28275900 |
Magnesium bromide (MgBr2) - Upstream Downstream Industry
| Raw Materials | Magnesium Hydroxide |
Magnesium bromide (MgBr2) - Nature
Open Data Verified Data
magnesium bromide has anhydrous, six water and ten water three hydrate, six water magnesium bromide soluble in water, alcohol, acetone and diethyl ether, easy deliquescence. The solubility of magnesium bromide in water at 20 °c is lomg/lOOmL. The solubility of magnesium bromide hexahydrate is 95% G/lOOmL in ethanol at 20 °c. Six
Water magnesium bromide White needle crystal density of 2. 076G/cm3. Melting point 174.2 °c. Magnesium bromide can form MgBr2 · 10H20 and MgBr2 · 6H20 Crystal hydrate under different temperature conditions, and anhydrous MgBr2 can not be cooled from the solution.
Last Update：2024-01-02 23:10:35
Magnesium bromide (MgBr2) - Preparation Method
Open Data Verified Data
- neutralization method: magnesium hydroxide is dissolved in hydrobromic acid for neutralization reaction, then heated and concentrated to remove excessive water, cooled to room temperature to obtain magnesium bromide hexahydrate, cooled to 0 ℃ to obtain magnesium bromide decahydrate, anhydrous magnesium bromide is obtained by dehydration of magnesium bromide hexahydrate under a hydrogen flow.
- Direct method: magnesium hydroxide or magnesium carbonate is used as raw material, quantitative water is added to form slurry, ammonia is introduced first, bromine is added to react, and the solution is filtered after reaction, the filtrate was maintained under alkaline conditions for several times with ammonia, allowed to stand, adjusted to acid with hydrobromic acid, decolorized with activated carbon, concentrated and cooled to obtain magnesium bromide hexahydrate. Ammonium bromide can also be synthesized first, followed by magnesium hydroxide and other raw materials.
- double salt decomposition method: The Double salts of NH4 Br and MgBr2 are subjected to double decomposition in a hydrogen atmosphere to obtain anhydrous magnesium bromide.
Last Update：2022-01-01 11:01:50
Magnesium bromide (MgBr2) - Use
Open Data Verified Data
mainly used in the pharmaceutical industry as a sedative, used as oxidation catalyst, used as magnesium dry battery electrolyte and Organic Synthesis Reagents, etc.
Last Update：2022-01-01 11:01:49
Magnesium bromide (MgBr2) - Safety
Open Data Verified Data
A polypropylene woven bag lined with a plastic bag was 25kg/bag. Sealed, dry, and stored in a cool place.
Last Update：2022-01-01 11:01:50
Magnesium bromide (MgBr2) - 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) |
| Use | used as oxidation catalyst, pharmaceutical intermediates, etc |
| production method | 1. Anhydrous magnesium bromide can be prepared by reacting bromine and magnesium tablets in anhydrous ether. A 500ml two-necked flask was filled with 150ml of freshly distilled anhydrous diethyl ether and 10g of smooth magnesium chip, and magnetic stirring was carried out with a polytetrafluoroethylene stirrer. The gas outlet of the flask was connected to a CaCl2 drying tube to isolate moisture from the outside. The flask was placed in an ice-water bath to absorb the large amount of heat released by the reaction. 15ml of pure bromine was added to the wash flask, heated to 50-55 °c, and bromine vapor was carried through the bottom of the flask with a flow of 5ml of dry nitrogen per minute. After complete evaporation of bromine, the reaction was stopped. The whole reaction solution in the flask was transferred to a dry flask, and cooled to 0 ° C. Or lower, and triethylether magnesium bromide crystals were precipitated. Discard the mother liquor, add anhydrous benzene to the crystal and let it stand at room temperature. Benzene and diethyl ether form a mixture of diethyl ether and benzene, and cool it again to below 0 ℃, after Suction filtration and washing with benzene at 0 °c, the impurities remained in the above mixture and the ether was removed by suction with a water pump. The temperature is increased to 150-175 ° C. Within a few hours, the magnesium bromide triethylether is decomposed, and finally the ether is pumped off by a mechanical pump to obtain the magnesium bromide. The yield was 60%-70% and the purity was 99.3%-99.5%. Without the purification of benzene, the purity is only 90% ~ 95%. 2. Dehydration with hexahydrate of magnesium bromide in a stream of HBr gas. MgCl2 was first converted to Mg(OH)2 with aqueous ammonia. The magnesium hydroxide was suspended in water and dissolved by passing HBr gas. The solution was concentrated, the resulting salt was recrystallized, dried and dehydrated in An HBr stream, and the stained HBr was removed by heating in a stream of dry nitrogen to obtain anhydrous magnesium bromide. The above operations need to be performed in a quartz vessel (grinding mouth device). 3. To a mixture of 60 ml of anhydrous diethyl ether and 30 ml of dry benzene was added 0.3g of magnesium powder (0.012g atoms) followed by 2.16g of mercury bromide (0.006 mol). The mixture was refluxed for 2 H, filtered and immediately used for the next reaction. |
Last Update：2024-04-09 20:52:54
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