Production process of anhydrous calcium chloride
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This post was last edited by sunjl1981 on 2013-1-6 at 19:54. Anhydrous calcium chloride (CaCl2) is a white or grayish-white solid (in granular, lumpy, or powdered form); it has a slightly bitter taste, is odorless, and is highly soluble in water, releasing a large amount of heat upon dissolution. It has a strong hygroscopicity and tends to deliquesce easily in air, so it should be stored in a sealed container. CaCl2 can be used as a desiccant, dehydrating agent, refrigerant, antifreeze for aircraft and automotive internal combustion engines, coagulant antifreeze, fabric fire retardant, food preservative, and more. I. Production principle: It can be produced by reacting limestone with hydrochloric acid. The main chemical reaction is as follows: CaCO3 + 2HCl → CaCl2 + H2O + CO2↑. II. Operation procedure: 1. Preparation of calcium chloride dihydrate (CaCl2·2H2O): Hydrochloric acid (31%) and limestone powder are added to the reaction tank in a ratio of 2.2:1, and a reaction takes place under stirring to produce an acidic calcium chloride solution, which is then transferred to a clarification tank. Lime milk is added to adjust the pH of the solution to 8.9–9, at which point iron hydroxide and magnesium hydroxide precipitate out. After clarification and filtration, the filtrate is transferred to an evaporating dish and heated to 172–174°C for evaporation. Following crystallization and separation, it is dried and dehydrated at 200–240°C to yield calcium chloride dihydrate. 2. Production of anhydrous calcium chloride: Calcium chloride dihydrate is heated again to 260–300°C to undergo drying and dehydration, resulting in white anhydrous calcium chloride. # + + .
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For industrial use, are evaporation pans used? I think boiling bed drying is employed for that purpose. .
Is the cost really that high? Just enough, just enough, just enough…
This is not a production process for anhydrous calcium chloride, but a laboratory method. Industrial production is not that complicated.
Now we produce calcium dihydrate, and the principle is similar to this. But it’s a bit more complicated; it’s used to make food-grade calcium.
Five-effect or three-effect evaporation: molten calcium chloride places high demands on the equipment, requiring titanium composite plates
This is the so-called acid production method, right?
How can hydrogen, oxygen, magnesium, and aluminum in calcium chloride be effectively removed? ? ?
Are there specific processes and equipment for large-scale industrial production (salt-acid method)? :)
Seek the process flow diagram and equipment information for the production of liquid calcium chloride via acid method. . .