PRODUCT IDENTIFICATION

CAS NO.

7757-82-6 (Anhydrous)

 

EINECS NO.

231-820-9

FORMULA

Na₂SO₄

MOL WT.

142.04

H.S. CODE

2833.11

 

SYNONYMS

Disodium monosulfate; Sulfuric acid, Sodium salt;

Disodium sulfate; Sodium sulfate; Sulfuric acid, sodium salt; Sulfuric acid, Disodium salt;Sulfuric acid disodium salt; Salt cake; Bisodium sulfate; Sodium sulfate (2:1); Thenardite; Natriumsulfat; Trona;

 

 

PHYSICAL AND CHEMICAL PROPERTIES

PHYSICAL STATE

Hygroscopic white powder, Odorless

MELTING POINT

880 - 888 C

BOILING POINT

1100 C (Decomposes)

SPECIFIC GRAVITY

2.66 - 2.75

SOLUBILITY IN WATER

Soluble

pH

Aqueous solution is neutral

 

 

NFPA RATINGS

Health: 1; Flammability: 0; Reactivity: 0

 

 

STABILITY

Stable under ordinary conditions

GENERAL DESCRIPTION & APPLICATIONS

Sodium sulfate is a white, orthorhombic crystalline solid at room temperatures ( a monoclinic structure at > 100 C, a hexagonal structure at > 250C).

 

It is reduced to sodium sulfide at high temperature. But sodium sulfate is a stable compound which does not decompose and does not react with oxidising or reducing agents at normal temperatures. It is neutral (pH of 7) in water.

 

Sodium sulfate is most soluble in water at 32.4 C (49.7g/100 g). Commercial major source of sodium sulfate is salt cake (impure sodium sulfate), a by-product of hydrochloric acid production from sodium chloride by treatment with sulfuric acid. Sodium sulfate is obtained also as a byproduct of rayon production and sodium dichromate production.

 

The decahydrate is known as Glauber's salt. About half of the world's production is from the natural mineral form of the decahydrate (mirabilite). Anhydrous sodium sulfate is found in nature as the mineral thenardite (Na₂SO₄). Other sodium sulfate minerals are metasideronatrite Na₄Fe₂(SO₄)₄(OH)₂13H₂O, krohnkite Na₂Cu(SO₄)₂12H₂O, and schairerite Na₃(SO₄)(F,Cl).

 

Sodium sulfate is consumed in four major categories; powder detergents as a processing aid and as a filler, wood pulp processing for making kraft paper, textile dyeing processes as a levelling agent to penetrate evenly, and molten glass process to remove small air bubbles. Sodium sulfate is employed also as a raw material for the production of various chemicals.

SALES SPECIFICATION

APPEARANCE

white powder

Na₂SO₄

99.0% min

WATER INSOLUBLES

0.05% max

Mg

0.15% max

Cl

0.35% max

Fe

0.002% max

pH

Neutral to slightly alkaline

MOISTURE

0.2% max

WHITENESS

80% min

PARTICLE SIZE

50% (100 mesh)

 

PACKING

25kgs, 50kgs in Bag

HAZARD CLASS

Not regulated