mechem
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anhydrous calcium chloride
I have some calcium chloride hexahydrate but need to convert it to a good anhydrous desiccant, as far as possible. What is the optimum temperature to
heat it to and for how long.
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Saerynide
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Don't bother with the temperature. Just throw it on the stove til it stops evolving steam and becomes a dry powder 
I heard it loses its water at ~175C.
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mechem
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Would it not stay at the dihydrate at 175C
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Phosphor-ing
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http://www.physicsforums.com/archive/index.php/t-174878.html
tells you what happens at 175C
[Edited on 17-4-2008 by Phosphor-ing]
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Klute
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I'm sure it would be much easier to just go and buy the anhydrous pellets in any hardware store, no? These work wonders as dessicant for dessicators,
gas, and certains solvants/solution (check compatibility beforehand).
They are very cheap, it will surely be more expensive to heat up a oven at >200°C for several hours to get a few 100's g of product.
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