Caustic soda

  • IUPAC Name: Sodium hydroxide
  • CAS Number: 1310 – 73 – 2
  • Formula: NaOH
  • Molecular Weight:39.99 g/mol
  • HS Code: 281512

Specifications of Caustic Soda Lye:

1Sodium Hydroxide     [as NaOH]
% w / wMin. 47.00
2Sodium Carbonate   [as Na2CO3]% w / wMax. 00.20
3Chlorides    [as Cl]% w / wMax. 00.015
4Sulphates    [as SO4]% w / wMax. 00.015
5Silicates   [as SiO2]% w / wMax. 00.01
6Iron     [as Fe]ppmMax. 10.00
7Copper     [as Cu]ppmMax. 01.00
9Manganese     [as Mn]ppmMax. 00.50
10Chlorates & Per Chlorate [NaClO3]ppmMax. 40.00
11Matter insoluble in Water.% w / wMax. 00.025
12Transmittance at 500 nm%Min 90.00
14Sodium Hydroxide     [as NaOH]
% w / wMin. 99.50

Specifications of Caustic Soda Flakes :

1Sodium Hydroxide     [as NaOH]% w / wMin. 97.00
2Sodium Carbonate   [as Na2CO3]% w / wMax. 00.40
3Chlorides    [as Cl]% w / wMax. 00.03
4Sulphates    [as SO4]% w / wMax. 00.03
5Silicates   [as SiO2]% w / wMax. 00.02
6Iron     [as Fe]ppmMax. 20.00
7Copper     [as Cu]ppmMax. 02.00
8Nickel     [as Ni]ppmMax. 02.00
9Manganese     [as Mn]ppmMax. 01.00
10Chlorates & Per Chlorate [NaClO3]ppmMax. 10.00
11Matter insoluble in Water.% w / wMax. 00.05

Applications :

The major users of caustic soda flakes are the aluminum industry, pulp & paper, leather and textile, oil and gas, oil wells, food industry and the chemical industry. The main applications are water treatment and water purification, as cleaning agent, or a wide range of uses in chemical industry like starch production or for the desulphurization in the petrochemical industry.

It is also used as an intermediate for a wide variety of organic chemicals such as dyes, pigments, agrochemicals and variety of inorganic chemicals such as sulphites, phosphites etc..

Sodium hydroxide is a popular strong base used in industry. Around 56% of sodium hydroxide produced is used by industry, 25% of which is used in the paper industry. Sodium hydroxide is also used in the manufacture of sodium salts and detergents, pH regulation, and organic synthesis. It is used in the Bayer process of aluminium production. In bulk, it is most often handled as an aqueous solution, since solutions are cheaper and easier to handle.