Method for preparing calcium propionate from calcium carbonate
Calcium propionate is white crystalline particles or crystalline powder. It is odorless or slightly smells of propionic acid, hygroscopic, easily soluble in water, and insoluble in alcohol. Calcium propionate is a newer food antifungal agent. It is the calcium salt of the acidic antifungal agent propionic acid. Under acidic conditions, it produces free propionic acid, which is weaker than sorbic acid and stronger than acetic acid. It has antibacterial effects and is effective against Aspergillus niger and Aspergillus niger. Aerophilic Bacillus has inhibitory effect. Calcium propionate is produced by reacting propionic acid with calcium hydroxide or calcium carbonate. In industry, calcium hydroxide is generally used as raw material. Calcium hydroxide is adjusted into a suspension in a reaction pot, propionic acid is added to react, the end point pH is 7~8, and the finished product is obtained after filtration and drying.
The method of preparing calcium propionate from calcium carbonate is as follows:
First, the raw material calcium carbonate is made into a water suspension, and the water used must be refined and purified. Remove impurities such as heavy metal magnesium. Put the CaCO3 aqueous suspension quantitatively into the neutralization reaction kettle, keep the temperature inside the kettle at 60-80°C, and add propionic acid while stirring. The neutralization reaction lasts for 2-3 hours. At this time, a large amount of CO2 gas escapes. Discharge through the condenser vent pipe. By adjusting the external heating temperature, adding acid and stirring speed, the reaction can reach optimal conditions. The pH value at the end of the reaction should be controlled at 7 to 8. This reaction is a reversible reaction. The CO2 gas should be discharged in time to better control the end of the reaction. . The neutralized aqueous solution is vacuum filtered, and the filtrate obtained is concentrated in an evaporator, and then placed in a crystallization tank for slow cooling and crystallization at normal temperature and pressure. The mother liquor can be returned to the evaporator and used 2 to 3 times before discarding. The separated solid is dried into small particles, crushed, measured, and packaged to obtain the finished product of calcium propionate.
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