Diphosphoric acid, magnesium salt
Magnesium Pyrophosphate
CAS: 13446-24-7
Molecular Formula: Mg2O7P2
Diphosphoric acid, magnesium salt - Names and Identifiers
Diphosphoric acid, magnesium salt - Physico-chemical Properties
| Molecular Formula | Mg2O7P2 |
| Molar Mass | 222.55 |
| Density | 2.56g/mLat 25°C(lit.) |
| Melting Point | 1383℃ [HAW93] |
| Water Solubility | Soluble in dilute mineral acids. Insoluble in water. |
| Appearance | Powder |
| Color | White |
| Merck | 14,5684 |
| Storage Condition | Room Temprature |
| MDL | MFCD00049482 |
Diphosphoric acid, magnesium salt - Risk and Safety
| Hazard Symbols | Xi - Irritant |
| Safety Description | S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S36 - Wear suitable protective clothing. |
Diphosphoric acid, magnesium salt - References
| Introduction | magnesium pyrophosphate is a colorless crystal or white powder. The specific gravity was 2.559. Melting point 1,383 °c. Insoluble in water, ethanol, soluble in acid. The trihydrate lost water of crystallization at 100 °c. It is obtained by heating and decomposing magnesium ammonium phosphate. |
| stability | magnesium pyrophosphate is stable at normal temperature and pressure. Magnesium pyrophosphate has two variants, α-type (low-temperature type) and β-type (high-temperature type), with a transition point temperature of 68 °c. However, both tend to coexist over a wide range of temperatures. |
| Related research | Li Haobo et al, the acid hydrolysis of magnesium pyrophosphate in the pyrolysis product was studied. The Effects of pH value, temperature and reaction time on the acid hydrolysis behavior of magnesium phosphate were investigated, and the conversion of pyrophosphate to orthophosphate was obtained. The results show that the magnesium pyrophosphate, which does not have the ability of ammonia nitrogen precipitation, can be effectively converted into magnesium phosphate, which has the effect of efficient precipitation of ammonia nitrogen, so as to realize the recycling of magnesium ammonium phosphate. The ammonia precipitation performance of acid hydrolysis products was also investigated, including the effects of pH value and dosage on ammonia precipitation performance. The results show that under appropriate pyrolysis and acid hydrolysis conditions, magnesium ammonium phosphate still has more than 90% ammonia nitrogen removal performance after 5 cycles of recycling. |
| preparation method | the preparation method of magnesium pyrophosphate is as follows: 1. It is prepared by metathesis reaction of sodium pyrophosphate solution and magnesium chloride solution. 2. Magnesium diphosphate is formed by heating ammonium magnesium phosphate hexahydrate NH4MgPO4 · 6H2O at a temperature above 600 ° C. For about 2H. Magnesium pyrophosphate can also be obtained by mixing an aqueous solution of sodium pyrophosphate with an aqueous solution of magnesium chloride. |
| Use | magnesium pyrophosphate is a colorless monoclinic crystal, and can be used as a stabilizer for toothpaste, tooth powder, etc. |
| storage | magnesium pyrophosphate was sealed at room temperature, cool, ventilated and dried. |
Last Update：2024-04-09 15:16:58
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