Sodium sulfate anhydrous
| Formula: | Na2O4S |
| Chemical formula: | Na2SO4 |
| Density: | 2.70 g/cm3 (20 °C) |
| Molar mass: | 142.04 g/mol |
| Bulk density: | ~ 1400 – 1600 kg/m3 |
| CAS number: | 7757-82-6 |
| HS code: | 28331100 |
| EC number: | 231-820-9 |
| Storage : | Without limitations. |
| SDS | available |
| RTECS: | WE1650000 |
| Odour: | odourless |
| Form: | solid |
| Color: | white |
| PH value: | 5.2 – 8.0 (50 g/l 20 °C) |
| Solubility in water: | 200 g/l (20°C) |
| Solubility in ethanol: | insoluble |
| Assay | ≥ | 99 | % |
| Description | Conforms | ||
| Solubility | Conforms | ||
| Identification | Conforms | ||
| Chloride | ≤ | 0.02 | % |
| Heavy metals | ≤ | 0.001 | % |
| Acidity or Alkalinity | ≤ | 0.5 | % |
| Heavy metals | ≤ | 0.001 | % |
| Loss on drying | ≤ | 0.5 | % |
Sodium sulfate anhydrous is the anhydrous (water-free) form of sodium sulfate, an inorganic compound with the chemical formula Na₂SO₄. It is a white, crystalline solid widely used in industrial processes, particularly in detergents and paper manufacturing.
🏭⚗️ Production
Sodium sulfate can be obtained from natural mineral sources such as mirabilite or through industrial processes like the Mannheim process, which involves reacting sodium chloride (NaCl) with sulfuric acid (H₂SO₄). The anhydrous form is typically produced by heating the decahydrate form or by crystallization from solutions at high temperatures.
🔬 Properties
Sodium sulfate anhydrous is a white, odorless crystalline powder with a high melting point of about 884 °C. It is highly soluble in water and exhibits good thermal and chemical stability. It does not absorb moisture readily (non-hygroscopic), making it useful as a drying agent in laboratory settings.
🧪 Applications
• Widely used as a filler in powdered detergents, due to its inertness and cost-effectiveness.
• Employed in the kraft process for paper pulping.
• Used as a drying agent in organic synthesis and chemical laboratories.
• Serves in textile and dyeing processes to help with dye absorption.
• Sometimes used in glass manufacturing and pharmaceutical formulations.
