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What are the main uses of anhydrous calcium acetate?
Anhydrous calcium acetate does not contain crystal water, and is different in density, melting point, and molecular weight, but its chemical properties are the same as those of hydrated calcium acetate. It is in the form of white powder. If the skin and mucous membranes come into contact with this substance, it will also be irritated, and problems will occur in the eyes and respiratory system. It can be dissolved in water and alcohol, decompose when heated, and can also burn.
It can be used as a corrosion inhibitor and food stabilizer, and is also widely used in industry, such as organic synthesis and analytical reagents, or as a food stabilizer and buffer, and can also be used as a stabilizer and antibacterial agent. It is also a very good food fortifier, and its absorption effect is higher than that of inorganic calcium. Since it is non-toxic to humans, it can also be used in the manufacture of baby food.
What are the physical properties of anhydrous calcium acetate?
Anhydrous calcium acetate is a white crystalline powder. It is solid at room temperature and easily soluble in water (solubility is about 37.4g/100mL at 20°C). Its aqueous solution is neutral or weakly alkaline. It is slightly soluble in ethanol and almost insoluble in non-polar solvents such as ether. Its melting point is about 160°C (it is easily decomposed into products such as calcium carbonate at high temperatures). It is hygroscopic and has relatively stable chemical properties at room temperature. It is an ionic crystal composed of calcium ions and acetate ions.
How to prepare anhydrous calcium acetate
The preparation methods of anhydrous calcium acetate mainly include neutralization reaction method and hydrate dehydration method. When preparing anhydrous calcium acetate by neutralization reaction method, analytically pure glacial acetic acid is first mixed with distilled water, and calcium carbonate powder (the molar ratio of acetic acid to calcium carbonate is about 2:1) is added in batches under stirring and cooling conditions until no more carbon dioxide bubbles are generated. At this time, the solution is weakly acidic, and then the reaction solution is filtered to remove impurities, and then the filtrate is evaporated and concentrated until a crystal film appears. After cooling and crystallization, calcium acetate crystals are obtained. Finally, the crystals are placed in a vacuum drying oven and dried to constant weight at 120-140°C to obtain anhydrous calcium acetate. When preparing anhydrous calcium acetate by the hydrate dehydration method, first place the calcium acetate monohydrateCa(CH3COO)2⋅H2O)crystals in a porcelain crucible or evaporating dish, put it into a vacuum drying oven, and heat it at 120-140°C for dehydration (avoid direct high-temperature heating in an open container to prevent decomposition of calcium acetate). Once crystal water has been completely extracted from the product, weigh it regularly until its mass no longer fluctuates, to ensure complete removal and obtain anhydrous calcium acetate in white powder form. This method reduces product decomposition at high temperatures by controlling both temperature and vacuum environment; making it suitable for purifying hydrates to produce anhydrous substances.
What are the precautions for the storage and transportation of anhydrous calcium acetate?
When storing and transporting anhydrous calcium acetate, it needs to be sealed and stored in a dry, ventilated and cool warehouse, away from fire and heat sources, and avoid contact with humid air to prevent moisture absorption and deterioration; during transportation, the packaging must be ensured to be intact and not damaged, and it must be protected from rain and moisture. It must not be mixed with acids, oxidants and other substances. The transportation vehicles should be equipped with corresponding fire-fighting equipment and leakage emergency treatment equipment. The transportation personnel must be familiar with its physical and chemical properties and emergency treatment methods, drive on the prescribed route, and avoid staying in densely populated areas to ensure the safety of the storage and transportation process and the stability of product quality.
What are the differences in the application of anhydrous calcium acetate in different industries?
The differences in the application of anhydrous calcium acetate in different industries are mainly reflected in the following: in the chemical and industrial fields, it is used as an organic synthesis catalyst, coating curing agent, etc., with an industrial-grade purity of ≥98% and relatively loose restrictions on impurities; in the food industry, it is used as a calcium fortifier, preservative, etc., and must comply with food-grade standards (purity ≥99%) and strictly control the heavy metal content (≤10ppm); in the pharmaceutical field, it is used as an oral calcium preparation or drug excipient, with a pharmaceutical-grade purity of ≥99.5%, which must comply with pharmacopoeia standards and has extremely strict impurity control (such as heavy metals ≤5ppm); in agriculture, it is used for soil improvement, calcium supplementation in aquaculture, etc., with an agricultural-grade purity of ≥95%, and more attention is paid to water solubility and cost; in the materials and environmental protection field, it is used to prepare degradable materials or remove phosphorus from wastewater, and the purity requirements are between industrial and agricultural grades, with an emphasis on functional adaptability. These differences are determined by the safety, functionality and cost requirements of each industry.