Sodium Bicarbonate, whose molecular formula is NaHCO₃, is an inorganic salt, white crystalline powder, odorless, alkaline in taste, and easily soluble in water. It decomposes slowly in humid air or hot air to produce carbon dioxide, which is completely decomposed when heated to 270°C. When encountering acid, it will decompose strongly to produce carbon dioxide.
|Nickname||Baking Soda, Sodium Bicarbonate, Sodium Acid Carbonate|
|Melting point||270 ℃|
|Boiling point||851 ℃|
(1) Pharmaceutical Industry
Sodium bicarbonate can be directly used as a raw material in the pharmaceutical industry to treat hyperacidity.
(2) Food Industry
In food processing, it is the most widely used bulking agent for the production of biscuits, bread, etc. It is a generator of carbon dioxide in soda drinks. It can be compounded with alum to form alkaline baking powder, or it can be compounded with soda ash to form civil soda. It can also be used as a butter preservative.
(3) Fire Equipment
Used in the production of acid-base fire extinguishers and foam fire extinguishers.
(4) Other Industry
In the rubber industry, it can be used in the production of rubber and sponge; in the metallurgical industry, it can be used as a flux for casting steel ingots; in the machinery industry, it can be used as a molding aid for cast steel (foundation) sand molds; in the printing and dyeing industry, it can be used as a fixation for dyeing and printing. Agent, acid-base buffering agent, fabric dyeing and finishing agent; adding baking soda to dyeing can prevent the yarn from producing colored flowers; used as a raw material for antacid in the pharmaceutical industry; also used as a detergent for wool and in agriculture Seed soaking etc.
3. Production Process
3.1 Combined process for manufacture of sodaash and ammonium chloride.
The chemical equation can be summarized as the following three-step reaction.
(Ammonia is first introduced into the water, and then carbon dioxide is introduced）
(2) NH4HCO3+NaCl=NH4Cl+NaHCO3↓（NaHCO3 has the least solubility, so it precipitates.）
(NaHCO3 has poor thermal stability and is easily decomposed when heated）
Using the solubility of NH4Cl, NaCl can be added to the solution in (2) at low temperature, and NH4Cl will be precipitated to obtain fertilizer, which improves the utilization rate of NaCl.
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|Insoluble content ≤||0.01||0.05||0.10|