Anhydrous calcium acetate

1. Application
Anhydrous calcium acetate has important applications in many fields. In the industrial field, it is often used as a chelating agent and can be combined with a variety of metal ions. In the electroplating process, it can stabilize the metal ions in the plating solution, ensure the uniform and smooth coating, and improve the quality of electroplating products. In the printing and dyeing industry, it helps the dye to better adhere to the fabric, improve the dyeing fastness, and make the dyeing effect more ideal. In the food industry, it plays the role of preservative and acidity regulator. As a preservative, it can effectively inhibit the growth of microorganisms and prolong the shelf life of food. For baked goods such as bread and cakes, the addition of anhydrous calcium acetate can delay the rate of deterioration; as an acidity regulator, it can adjust the pH of food, optimize the taste of food, and play this role in some beverages and cans. In addition, in the pharmaceutical field, anhydrous calcium acetate is also used as a pharmaceutical excipient to assist in drug molding and improve drug stability.

Second, properties
Anhydrous calcium acetate is usually a white crystalline powder, odorless or slightly acetic acid odor. Its density is relatively stable, it has a certain hygroscopicity, and it is easy to absorb water in a humid environment. From the perspective of solubility, it is easily soluble in water, and its aqueous solution is neutral or slightly alkaline. Anhydrous calcium acetate has a high melting point, good thermal stability, and is not easy to decompose under general conditions. In chemical reactions, acetate ions have certain chemical activity and can react with a variety of substances, such as acetic acid can be formed by reacting with strong acids. This property makes it used in some chemical synthesis.

Third, there are various production methods for producing
anhydrous calcium acetate. A common one is to use acetic acid and calcium carbonate as raw materials and react at a suitable temperature. Add acetic acid to the reactor, slowly add calcium carbonate powder, and stir at the same time. During the reaction, carbon dioxide gas will escape. The reaction equation is roughly: $2CH_3COOH + CaCO_3\ longrightarrow (CH_3COO) _2Ca + H_2O + CO_2 ↑ $. After the reaction is completed, the unreacted calcium carbonate and other impurities are removed by filtration to obtain a solution containing calcium acetate. Then the solution is evaporated and concentrated to precipitate calcium acetate crystals. After that, the crystals are separated and dried to finally obtain anhydrous calcium acetate products. In addition, acetic acid and calcium oxide reactions can also be used to produce. Different production methods have their own advantages and disadvantages, and they need to be reasonably selected according to actual production needs and conditions.