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Sodium sulfate (CAS Number: 7757-82-6) is an inorganic compound with the chemical formula Na2SO4. It is a white crystalline solid, which is hygroscopic. Sodium sulfate is soluble in water, ethanol, glycerol and hydrogen iodide. However, it is insoluble in ethanol. It is also known as disodium sulfate, sulfate of sodium, thenardite, glauber's salt, mirabilis and mirabilite.



Sodium sulfate suppliers sell the chemical as a by-product of other processes in the chemical industry. Sodium sulfate is produced during the production of hydrochloric acid, either from sulfur dioxide in the Hargreaves process or from sulfuric acid/sodium chloride in the Mannheim process.

Hargreaves Process: 4 NaCl + 2 SO2 + O2 + 2 H2O → 2 Na2SO4+4 HCl

Mannheim Process: 2 NaCl + H2SO4 → Na2SO4+2 HCl 

Sodium sulfate can be produced from sulfur dioxide through the Hargreaves process.

Hargreaves Process: 4 NaCl + 2 SO2 + O2+ 2 H2O → 2 Na2SO4 + 4 HCl

Industries buy sodium sulfate in the purified form, which is obtained through the decahydrate form in bulk, owing to the tendency of the anhydrous form to attract organic compounds and iron compounds. The hydrated form is converted to anhydrous form by gentle warming.



  • Detergent manufacturing companies buy sodium sulfate for use in powdered and liquid laundry detergents.

  • Wood pulp manufacturers buy this chemical from sodium sulfate manufacturers and sodium sulfate suppliersfor use in the kraft process.

  • Food industries buy sodium sulfate to use as a diluent for food colours.

  • It is represented by the E number E514. This compound is bought from sodium sulfate suppliers and sodium sulfate manufacturers for laboratory use for the removal of water from organic solutions as an inert drying agent.

  • It is in the manufacture of laxatives and is effective in the removal of drugs like paracetamol.

  • Other applications of sodium sulfate include starch manufacture, de-frosting of windows,carpet fresheners and cattle feed additive.



Sodium sulfate is generally considered non-toxic, but it must be handled with care. Contact with the chemical may cause eye irritation, skin irritation, redness and pain. It can cause allergic reaction for certain people. Ingestion of the compound can cause gastrointestinal irritation with symptoms like vomiting, diarrhea and nausea. Inhalation of sodium sulfate can result in respiratory tract irritation or asthma. Sodium sulfate manufacturers and industries that buy sodium sulfate must be aware of its toxicity.


Handling and Storage

Adequate ventilation must be provided with minimal dust generation and accumulation. Contact with skin, eyes and clothing should be avoided by sodium sulfate suppliers, sodium sulfate manufacturers and factory personnel. The chemical must be stored in dry place away from moisture. Risk of contact can be prevented by using appropriate personal protection equipment like eye protection and paper mask.


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