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Medium
dense 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
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Structural formula: Na -- O -- C -- O --
NA
Common
names: Sodium carbonate, calcined soda, disodium
carbonate
CAS
registry number: 497-19-8
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Characteristics
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IS
251:1998 specifications
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TCL-assured
specifications
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Units
|
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Molecular
weight
|
|
106
|
|
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Bulk
density
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751
- 950
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751
- 950
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Kg/m3
|
|
Volatile
matter content
(at the time of packing)
|
2
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0.80
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%,
max
|
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Total
alkalinity (as Na2CO3
)
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98.5
|
99.0
|
%,
min
|
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Sulphates
(as Na2SO4)
|
0.08
|
0.03
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%,
max
|
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Chlorides
(as NaCl)
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1.0
|
0.80
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%,
max
|
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Iron
(as Fe2O3)
|
By
colorimetric method
|
|
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%,
max
|
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By
spectrophotometric method
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0.007
|
0.002
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Matter
insoluble in water
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0.15
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0.03
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%,
max
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Manufacturing
process
Common salt and limestone are the raw materials
used in the manufacture of medium dense soda ash.
In the Solvay process, soda ash is manufactured
by dissolving salt in seawater. This is followed
by purification. The purified brine is ammoniated
and carbonated to get crude bicarbonate slurry,
which is filtered and calcined to get light soda
ash. This light soda ash is packed directly in
the auto silo. Tata Chemicals has tailored its
manufacturing process to meet the individual requirements
of its customers.
Applications
Medium dense soda ash is primarily used in the
detergents industry, because it has the rapid
dissolving-and-absorption properties required
by detergent manufacturers. As a basic industrial
chemical, it is used in the manufacture of glass,
silicates, bichromates and other products. Medium
dense soda ash is also used as a competitive alternative
to light soda ash.
Packaging
Available in 50-kg HDPE / PP bags with lamination.
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.
For
more information about this product or to place
orders, please contact ZN Langrana at:
ZN
Langrana
at
znlangrana@tatachemicals.com
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