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Shandong Yifengtuo Chemical Co.,ltd
Physical and chemical properties of calcium chloride dihydrate
Date：
2023-11-09 16:04
Appearance: colorless cubic crystal, white or grayish white, with granular, honeycomb [block, spherical, irregular granular, powder, non-toxic, odorless, slightly bitter taste.
Relative density: 2.15 (25 ℃)
Melting point: 782 ℃
Boiling point: above 1600 ℃.
It is highly hygroscopic and easily deliquescent when exposed to the air.
Solubility: It is easily soluble in water and emits a lot of heat at the same time. Its aqueous solution is slightly alkaline. Soluble in alcohol, acetone and acetic acid. It reacts with ammonia or ethanol to generate CaCl28NH3 and CaCl24C2H5OH complexes respectively. At low temperature, the solution crystallizes and precipitates hexahydrate. When it is gradually heated to 30 ℃, it is dissolved in its own crystalline water. When it is continuously heated, it gradually loses water. When it is heated to 200 ℃, it becomes dihydrate. When it is heated to 260 ℃, it becomes white porous anhydrous calcium chloride.
It is also called ice calcium. Colorless crystal. Generally, the products are white, grayish white or slightly yellow flakes or blocky solids with bitter and astringent taste. Density 1.85g/cm3 (20 ° C). It is soluble in water, alcohol and ether. Its aqueous solution is neutral or slightly alkaline. It is corrosive. When heated to 260 ℃, it becomes anhydrous after dehydration. Strong deliquescence. Distillation waste liquor (containing 100g/L of calcium chloride) from the production of soda ash by ammonia-alkali method is purified, clarified, evaporated, and separated from sodium chloride, and then the mother liquor is clarified and concentrated. When the content of calcium chloride reaches 70%, it is prepared by cooling. It can also be prepared by reaction of hydrochloric acid and limestone powder. It is used as a refrigerant, antifreeze, fire extinguishing agent, for melting ice and snow, for manufacturing anhydrous calcium chloride, a flame retardant for cotton fabrics, and a condensate for rubber production. It can accelerate the hardening of concrete and increase the cold resistance of building mortar. It is also used as a port defogger and road dust collector. Edible grade products can be prepared from industrial grade calcium chloride dihydrate saturated solution by adding decolorizing agent, heavy metal removal agent and arsenic removal agent for solution purification, filtering to remove impurities, cooling and crystallization of filtrate, solid-liquid separation and drying. It is used as a coagulant and calcium fortifier for canned and bean products.
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Email: susan@yifengtuochemical.com
Susan Liu
