- Basic Information: Anhydrous calcium hydrogen phosphate, chemical name: dibasic calcium phosphate, English name: Calcium phosphate dibasic, molecular formula: CaHPO4, molecular weight: 136.06, CAS: 7757-93-9.
- Physical Properties: It appears as a white powder, odorless and tasteless, soluble in dilute hydrochloric acid, nitric acid, and acetic acid, slightly soluble in water (solubility 0.1 g/l at 25°C), and insoluble in ethanol. The apparent density is 0.9 g/cm³, stable in air, and decomposes at 370 °C. The acute toxicity of calcium hydrogen phosphate has an LD50 (oral, rat) of 4000 mg/kg and an LD50 (dermal, rabbit) of >4720 mg/kg, classifying it as a low-toxicity substance.
- Irritation: Prolonged inhalation may irritate the mouth, nose, throat, and lungs, leading to diminished taste and smell, as well as nosebleeds. Protective measures should be taken to safeguard the respiratory system and skin during work, including wearing dust masks, gloves, and work clothing to prevent inhalation of dust.
- Production Process: There are two main production processes: the first is the direct calcination method, which uses dihydrate calcium hydrogen phosphate as the raw material and is calcined at a certain temperature. The second is the direct neutralization method, which involves neutralizing phosphoric acid with calcium-containing substances at a certain temperature, producing anhydrous calcium hydrogen phosphate through controlled reaction conditions.
- Applications: In the food industry, it is used as a leavening agent, dough conditioner, buffering agent, nutritional supplement, emulsifier, and stabilizer. In the pharmaceutical industry, it serves as an additive in calcium tablets and other tablet formulations. In toothpaste products, an appropriate amount of anhydrous calcium hydrogen phosphate is added as an abrasive to enhance the cleaning efficiency of the toothpaste while also improving its stability. It can be used in high-end whitening toothpaste.
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Chemical Formula: |
CaHPO4·2H2O |
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Molecular Weight |
172.088 |
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CAS Number |
7789-77-7 |
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EINECS Number |
231-826-1 |
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Density |
2.306g/cm |
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Appearance |
White crystalline powder |
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Solubility |
Slowly soluble in glycerin, slightly soluble in water, insoluble in ethanol, and easily soluble in dilute hydrochloric acid and nitric acid. |
Post time: 2025-01-23 09:54:37
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