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SODA ASH
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Soda ash light  

Light soda ash is a white, odourless, uniform product, free from dirt and other foreign matter.

Physical and chemical properties
Soda ash has a tendency to absorb moisture from the atmosphere. The moist soda ash then starts absorbing atmospheric carbon dioxide. This phenomenon of absorption of moisture and carbon dioxide by soda ash is known as weathering. After weathering, soda ash is likely to contain appreciable moisture and sodium bicarbonate, but the total alkali content of the bag does not change. Soda ash has a tendency to cake when it comes in contact with moisture and, consequently, becomes lumpy.

Chemical formula: Na2CO3

                                             O
                                             | |
Structural formula: Na -- O -- C -- O -- NA

Common names: Sodium carbonate, calcined soda, disodium carbonate

CAS registry number: 497-19-8

Characteristics

IS 251 : 1998 specifications

RTC-assured specifications

Units

Molecular weight

106

Bulk density

500 – 750

550 – 720

Kg/m3

Volatile matter content
(at the time of packing)

2

0.80

%, max

Total alkalinity (as Na2CO3)

98.5

99.0

%, min

Sulphates (as Na2SO4)

0.08

0.03

%, max

Chlorides (as NaCl)

1.0

0.80

%, max

Iron
(as Fe2O3)

By colorimetric method

0.0029

%, max

By spectrophotometric method

0.007

0.002

Matter insoluble in water

0.15

0.03

%, max

Applications
Light soda ash is one of the most important basic industrial chemicals. Light soda ash is used to regulate pH in many chemical process streams. The superior buffering capacity of soda ash versus caustic soda offers advantages in adjusting plant wastewater pH ranges.

Soda ash is used as the sodium source for sodium sulfite/bisulfite pulping liquors used in the sulfite, CMP, and CTMP processes, and in NSSC pulping.

It is also possible to replace a portion of the caustic soda in many pulp bleaching applications such as caustic extraction or hydrogen peroxide bleaching of mechanical or chemical pulps. However, the higher pH requirements of these applications may necessitate the continued use of some caustic soda.

Packaging: Available in 50-kg HDPE / PP bags and 750-kg PP jumbo bags with lamination / liner.

Storage: Soda ash should be stored under cover in a cool, dry place and the bags should not be stacked more than 15 bags high.