General Information

Chemical name: Sodium sulphate anhydrous

CAS No.: 7757-82-6

Molecular formula: Na2SO4

Standard Executed: GB/T 6009-2014

Packaging: in 50KG/1000KG/1250KG PP woven bag with PE liner

Technical specification

Items 

    Standards: I TOP 

  Standards: I 1st 

  Standards: II 1st

Purity (Na2SO4) %

≥99.6

≥99.0

≥98.0

Water insoluble matter content %

≤0.005

≤0.050

≤0.100

Ca2+ Mg2+ content %

----

≤0.15

≤0.30

Chloride (CI)content %

≤0.05

≤0.35

≤0.7

Ferric (Fe) content %

≤0.0005

≤0.0020

≤0.0100

Moisture content %

≤0.050

≤0.200

≤0.500

Whiteness %

≥85

≥82

≥82

Melting point

884 °C (1,623.2 °F; 1,157.15 °K) in standard state (at 25 ℃[77 °F], 100 kPa)

884 °C (1,623.2 °F; 1,157.15 °K) in standard state (at 25 ℃[77 °F], 100 kPa)

884 °C (1,623.2 °F; 1,157.15 °K) in standard state (at 25 ℃[77 °F], 100 kPa)

Boiling point

1,429°C (2,604 °F; 1,702 °K) in standard state (at 25 ℃[77 °F], 100 kPa)

1,429°C (2,604 °F; 1,702 °K) in standard state (at 25 ℃[77 °F], 100 kPa)

1,429°C (2,604 °F; 1,702 °K) in standard state (at 25 ℃[77 °F], 100 kPa)

Stability

Stable

Stable

Stable

Solubility in water

4.76g/100ml (0℃) 28.1g/100mL (25℃) 42.7g/100mL (100℃)

4.76g/100mL (0℃) 28.1g/100ml (25℃) 42.7g/100mL (100℃)

4.76g/100mL (0℃) 28.1g/100mL (25℃) 42.7g/100ml (100℃)

PH Range

5.2~9.2

5.2~9.2

5.2~9.2

Density

2.664 g/cm3 (at 25 ℃[77 °F], 100 kPa)

2.664 g/cm3 (at 25 ℃[77 °F], 100 kPa)

2.664 g/cm3 (at 25 ℃[77 °F], 100 kPa)

Refractive index (nD)

1.468 (at 25 ℃[77 °F], 100 kPa)

1.468 (at 25 ℃[77 °F], 100 kPa)

1.468 (at 25 ℃[77 °F], 100 kPa)

Specific Gravity

2.68

2.68

2.68

Shelf life/Retest

24 months

24 months

24 months

Storage

Store at RT

Store at RT

Store at RT

Appearance

White free-flowing powder

White free-flowing powder

White free-flowing powder

Description

While thenardite is the anhydrous form of Na2SO4, mirabilite is a naturally-occurring decahydrate, Na2SO4·10H2O. The white, water-soluble, solid hydrate is also known as the Glauber’s salt. It’s formed by heating sodium chloride and sulfuric acid. This compound is used in dyeing, glass production, and the preparation of sodium bisulfate.

Anhydrous sodium sulfate is found in the form of white crystalline powder with an orthorhombic or hexagonal structure. It’s hygroscopic, soluble in water, insoluble in ethanol. The decahydrate consists of colorless monoclinic crystals, soluble in water, but insoluble in ethanol.

Sodium sulfate is one of the essential sodium salts. The decahydrate was first prepared by Johann Glauber in the 17th century, in the form of a by-product while making hydrochloric acid from sulfuric acid and sodium chloride.

SSA is mainly used as the filler of synthetic detergent. In the paper industry, it’s an integral part of the Kraft Process as the atmometer during sulfate pulp production. In the glass industry, it’s a substitute for pure alkali. The chemical industry implements it as the raw ingredient for the manufacturing of sodium sulfide, sodium silicate, and similar chemical products. The application in the textile industry is in the formulation of a Vinylon spinning coagulation bath. It also has a purpose in the pharmaceutical industry, in the form of a laxative.

Other uses include ultramarine production, printing and dyeing textiles, and standardizing dyes. A principal use of anhydrous sodium sulfate is in the form of an agent to eliminate water from organic solvents and their extracts for organic synthesis and instrumental analysis. Sodium sulfate is a standard laboratory reagent that can also be used in the preparation of other sodium salts.

In the laboratory, sodium sulfate can be synthesized from the reaction between sodium bicarbonate and magnesium sulfate.

Bulk sodium sulfate is customarily purified via the decahydrate form. The anhydrous form tends to attract organic compounds and iron compounds. The anhydrous form is easily produced from the hydrated form by gentle warming.

Stability/Shelf life

Stable. Incompatible with strong acids, aluminum, magnesium, strong bases. Hygroscopic.

Recommended storage: Dry, tight-closed, ideally in its original packaging, in room temperature.

Manufacturing

The most common chemical sodium sulfate production is during hydrochloric acid production with the resulting compound known as the salt cake. The Mannheim process utilizes sodium chloride (salt) and sulfuric acid. The Hargreaves process utilizes sulfur dioxide. 

Another production method neutralizes surplus sodium hydroxide by sulfuric acid. This method is regularly applied and convenient for laboratory preparation.

Industry use

SSA is mainly used as the filler of synthetic detergent. Other major applications are in the paper industry, glass industry, chemical industry, textile industry as well as the pharmaceutical industry.

Consumer use

SSA is principally used as neutral salt in synthetic detergents. Apart from being used as a laxative medicine, sodium sulfate is the antidote of barium and lead poisoning. It’s also a food additive and a common ingredient in the production of caramels.

Solubility

Soluble in water, clear, colorless.

Common synonyms

Sodium sulphate

Sulfate of sodium, Thenardite (mineral)

Glauber’s salt (decahydrate)

Sal mirabilis (decahydrate)

Mirabilite (decahydrate mineral)

Disodium sulfate

FAQ

Q1: Can I use Sodium chloride to replace Sodium sulphate in synthetic detergent powder?

A: In some cases, some detergent manufacturers do use Sodium chloride as a substitute of Sodium sulphate to produce concentrated synthetic detergent powder, by dry mixing method. However, it’s not recommended to use Sodium chloride to produce puffed synthetic detergent powder in a spray drying tower.

Q2: Do you supply mineral source Sodium sulphate or by-product Sodium sulphate?

A: We have both available, and both are of the best quality.

Q3: Are you able to supply Sodium sulphate in bulk carrier? Or only in containers?

A: STPP Group has been supplying Sodium sulphate in both ways. To most of our customers, we deliver in containers, with MOQ as low as 27 tons. We also have been delivering regularly to South Africa, Iran, and Latin Americas in bulk carriers.