The main raw materials for producing baking soda
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What are the main raw materials used to produce baking soda? I now know that limestone is one of the main raw materials. What are the others? What are the main price factors?
In fact, the intermediate product used in the production of soda ash is sodium bicarbonate, also known as baking soda; therefore, the raw materials used for producing soda ash are the same as those used for producing baking soda, including limestone, ammonia, sodium chloride, and so on.
Limestone, ammonia, and sodium chloride react in the presence of a catalyst to produce sodium bicarbonate
May I ask the ADSL121 moderator: What is the name of this catalyst?
1# misnihaoma Baking soda can be produced by passing carbon dioxide gas into a sodium carbonate solution to re-carbonate it.
Similar to the method used for producing soda ash, there are mainly two methods for producing baking soda: the natural soda method and the synthetic method. In recent years, another production process has been developed (mainly in the Hengyang area), namely the so-called brine double-displacement method. Among the three production methods, the soda ash synthesis method yields the highest quality product (primarily in terms of differences in Cl‑, SO42‑, clarity, and whiteness), but it also has the highest cost; only high-grade baking soda can be produced using this synthesis method. The raw materials for this synthesis method are also simple: soda ash, carbon dioxide, and water. At temperatures of 90–60°C (the temperatures at the top and bottom of the carbonation tower), carbonation, separation, washing, and drying are carried out to obtain the desired product. Main consumptions: about 650 kg/t of soda ash, and around 200 m3/t of carbon dioxide (the amount is lower when using concentrated gas for soda production, but lime-fired kiln gas is generally used). Electricity consumption varies depending on the installation and the raw gas used; the rest of the consumptions are water, whose cost can be disregarded.
Soda ash manufacturers use water to recover the alkaline dust from the flue gas of the calcination furnaces; therefore, it can be directly transported to the baking soda production workshop, where carbonation with carbon dioxide is carried out. After filtration, centrifugation, and drying, the finished baking soda is obtained.