Sodium Bicarbonate

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Product information

Sodium bicarbonate test item	Index
CAS NO.	144-55-8
EINECS NO.	205-633-8
Density	2.20 g/cm³
Chemical Formula	NaHCO₃

Product use

In food processing, sodium bicarbonate is the most widely used loosening agent, used in

the production of biscuits, bread, etc. However, after action, sodium carbonate will remain,

and excessive use will cause excessive alkalinity in the food, leading to a deterioration of

flavor and a yellowish brown color. It is a generator of carbon dioxide in soda drinks; It can

be combined with alum to form alkaline fermentation powder, or with soda ash to form civil

stone alkali; It can also be used as a butter preservative. It can be used as a color protectant

for fruits and vegetables in vegetable processing. Adding about 0.1% to 0.2% sodium

bicarbonate during fruit and vegetable washing can stabilize the green color. When sodium

bicarbonate is used as a fruit and vegetable processing agent, it can increase the pH value

of fruits and vegetables, improve the water holding capacity of proteins, promote the softening

of food tissue cells, and dissolve astringent ingredients by boiling and bleaching them. In

addition, it has a deodorizing effect on goat milk, with a usage rate of 0.001% to 0.002%.

Product packaging

25kg bag of sodium bicarbonate.

Industrial preparation of sodium bicarbonate

Gas-phase carbonization method
The sodium carbonate solution is carbonized by carbon dioxide in a carbonization tower,

and then separated, dried, and crushed to obtain the finished product.
Na2CO₃+CO₂(g)+H₂O=2NaHCO₃

Gas-solid phase carbonization method
Place sodium carbonate on the reaction bed and mix it with water. Inhale carbon dioxide

from the lower part, carbonize it, and then dry and crush it to obtain the finished product.
Na2CO₃+CO₂(g)+H₂O=2NaHCO₃

Waste alkali liquid recovery method
In the production process of soda ash, the furnace gas produced by the soda ash

calcination furnace still contains a large amount of alkali powder after cyclone separation.

The furnace gas is recovered with hot alkali to dissolve the alkali powder in the alkali solution.

During the circulation dissolution process, some of the alkali solution is sent to the ammonia

distillation tower to evaporate the ammonia in the hot alkali solution, further concentrating the

alkali solution as the raw material for producing sodium bicarbonate. The ammonia, carbon

dioxide, and water mixture from the top of the ammonia distillation tower enters the original

furnace gas cooling tower. The mother liquor separated and dehydrated in the production of

sodium bicarbonate is used for the circulation of hot alkali solution to dissolve and recover

alkali powder in the furnace gas, forming the production process cycle.

After recycling the waste alkali solution, it is carbonized, centrifuged, and dried to produce

the finished product of sodium bicarbonate.

Natural alkali processing method
Using natural alkali as the raw material, due to its high impurity content, it is necessary

to strictly control the alkali temperature, concentration, and mother liquor circulation times

when preparing the alkali solution. The total salt content in the mother liquor should be

greater than 240g/L. After alkalization, the concentration of the alkaline solution is greater

than 150g/L for sodium carbonate, less than 50g/L for sodium chloride, and less than

90g/L for sodium sulfate. The obtained alkaline solution is filtered to remove residue, and

then carbonized with carbon dioxide to form sodium bicarbonate crystals. After washing

and dehydration, the washing solution can be returned to alkalization or discharged. The

crystals are dried to obtain the finished product of sodium bicarbonate

Laboratory preparation
The laboratory can use an aqueous solution of sodium carbonate to react with carbon

dioxide to prepare sodium bicarbonate.