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Stability of magnesium sulfate monohydrate

2019-12-20
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Magnesium sulfate monohydrate can be seen in various industries due to its chemical characteristics. This is due to its own stability. When performing chemical reactions, many friends do not understand the reaction principle. Let me give you the following. Tell me about its stability.


Stability: Stable in humid air below 48.1 ℃, easy to weather in warm and dry air. Above 48.1 ℃, it loses 1 crystal water and becomes magnesium sulfate hexahydrate. At 67.5 ℃, it dissolves in its own crystal water. At the same time, magnesium sulfate monohydrate is precipitated. At 70 to 80 ° C, 4 crystal waters are lost, 5 crystal waters are lost at 100 ° C, 6 crystal waters are lost at 150 ° C, and all crystal waters are lost at 200 ° C. Powdery anhydrous magnesium sulfate. The dehydrated product is placed in humid air to reabsorb moisture.

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 In a saturated solution of magnesium sulfate, hydrated crystals with 1, 2, 3, 4, 5, 6, and 12 water can be crystallized, and magnesium sulfate dodecahydrate is precipitated in a saturated aqueous solution at -3.9 to 1.8 ° C. In a saturated aqueous solution at -1.8 to 48.18 ° C, magnesium sulfate monohydrate is precipitated. In a saturated aqueous solution at 48.1 to 67.5 ° C, magnesium sulfate hexahydrate is precipitated. When it is higher than 67.5 ° C, magnesium sulfate monohydrate is precipitated. The magnesium sulfate hexahydrate is 87 to 92. Heterogeneous melting occurs at ℃, and magnesium sulfate pentahydrate or tetrahydrate is formed. Magnesium sulfate tetrahydrate is converted to magnesium sulfate trihydrate at 106 ° C. Magnesium sulfate trihydrate is converted to magnesium sulfate dihydrate at 122-124 ° C. The conversion of magnesium sulfate is stable at 161 to 169 ° C.

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