Magnesium chloride is a common inorganic salt that is widely used in industry, agriculture, medicine and food. However, in some applications, anhydrous magnesium chloride, i.e., magnesium chloride that does not contain any water or crystalline water, is required. Since magnesium chloride is easy to absorb moisture, the direct use of magnesium chloride will introduce water and affect the quality of products. Therefore, magnesium chloride needs to be made into anhydrous magnesium chloride.
To make anhydrous magnesium chloride, the following methods can be used:
1.Drying and dehydration method: heat the magnesium chloride to about 200 to make it completely dry and dehydrated. This method is suitable for small quantities of preparation, but for mass production, it is more energy-intensive and inefficient.
2.Ion exchange method: An ion exchanger is used to adsorb the water in magnesium chloride. Commonly used ion exchangers include acidic clay, diatomaceous earth and activated carbon. This method can be produced continuously, but requires the use of a large amount of ion exchanger and a large amount of waste during the regeneration process.
3.Azeotropic distillation: using the azeotropic properties of magnesium chloride and water, the water is removed by rectification. This method requires a large investment in energy and equipment and is suitable for large-scale production.
4.Chemical dehydration method: Anhydrous magnesium chloride is generated by adding appropriate chemical reagents to react with magnesium chloride. Commonly used chemical reagents are alcohols, acids, etc. The method is simple to operate and low in cost, but the quality of the obtained anhydrous magnesium chloride is poor.
When preparing anhydrous magnesium chloride, the following points need to be noted:
1.Selection of high-quality raw materials: The use of high-purity magnesium chloride raw materials can reduce impurities and by-products in the preparation process.
2.Control temperature and pressure: During the preparation process, the temperature and pressure need to be strictly controlled to ensure the quality and stability of the product.
3.Avoid the introduction of impurities: During the preparation process, avoid introducing any impurities or contaminants that may affect the purity and quality of the product.
4.Safe production: Due to the corrosive and irritating nature of magnesium chloride, relevant safety regulations should be complied with during the preparation process to ensure the safety and health of workers.
2023 Post Sprint In short, there are many ways to prepare anhydrous magnesium chloride, and you can choose the appropriate method according to actual needs. In the preparation process, it is necessary to pay attention to key factors such as temperature, pressure and raw material quality to ensure the quality and stability of the product. At the same time, it is also necessary to pay attention to issues such as production safety and environmental protection.