Phosphoric Acid Phosphoric Acid

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Phosphoric acid

Physical property of phosphoric acid phosphoric acid:

Melting point: 42 ℃

Boiling point: 261 ℃ (decomposition, phosphoric acid gradually dehydrates upon heating, therefore it does not have its own boiling point)

Commercial phosphoric acid is a viscous concentrated solution containing 85% H3PO4. Crystallization from a concentrated solution forms a semi hydrate 2H3PO4 · H2O (melting point 302.3K).

Freeze point:

Phosphoric acid belongs to the category of moderately strong acids, with a crystallization point (freezing point) of 21 ℃. When the temperature is below this point, semi hydrated (ice) crystals will precipitate. Of course, phosphoric acid usually does not form (ice) crystals at temperatures above 10 ℃ or even lower. This is because phosphoric acid has the characteristic of undercooling, which means that actual phosphoric acid sold on the market will deviate from its freezing point below 21 ℃ and will not immediately form (ice) crystals. But as long as this low temperature is maintained for a period of time, phosphoric acid can easily form ice crystals in a stationary state.

Phosphate crystals, like other liquid crystals, belong to physical rather than chemical changes. Its chemical properties will not change due to crystallization, which means the quality of phosphoric acid will not be affected by crystallization. As long as it is melted at temperature or diluted with heated water, it can still be used normally.

Crystallization characteristics: high concentration, purity, and crystallinity of phosphoric acid. According to experience, when the temperature is around 4 degrees Celsius and the concentration is greater than 85%, its crystallinity increases. If it is accidentally mixed with crystallized phosphoric acid, it can cause the phosphoric acid that did not originally crystallize to immediately infect and crystallize, and the abnormal rapid crystallization of phosphoric acid can lead to the formation of (ice) crystals in most of the phosphoric acid storage containers. After phosphate crystal formation (ice), the upper phosphate edge is sparse, and the lower part deposits needle shaped (ice) crystals of pure phosphate. Based on experience, 75% phosphoric acid is also difficult to form (ice) crystals at lower temperatures (around 4 ℃), so it is recommended to use 75% phosphoric acid as a more appropriate solution at lower temperatures.

Phosphate ice crystals are like water ice crystals, which are their inherent physical properties and properties that cannot be changed. Only proper storage and treatment can prevent ice crystals from forming.

Usage of phosphoric acid phosphoric acid:

Agriculture: Phosphoric acid is a raw material for the production of important phosphate fertilizers (such as calcium superphosphate and potassium dihydrogen phosphate), as well as for the production of feed nutrients (calcium dihydrogen phosphate).

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