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qPaladin qPaladin
wrote...
Posts: 37
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11 years ago
Why cannot the drying agent be filtered off  by vacuum filtration?
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wrote...
Educator
11 years ago
Huh?

What are you referring to? Sad Dummy
qPaladin Author
wrote...
11 years ago
Huh?

What are you referring to? Sad Dummy

I apologize; I mean drying agents in general. Why cannot they be filtered off by vacuum filtration?
wrote...
Educator
11 years ago
The drying agent is only working if it is still anhydrous. I would assume the vacuum filtration would dry it out, rendering it useless.

My two cents...
qPaladin Author
wrote...
11 years ago
The drying agent is only working if it is still anhydrous. I would assume the vacuum filtration would dry it out, rendering it useless.

My two cents...

What do you mean by "drying agent will dry out"?
wrote...
Valued Member
11 years ago
What do you mean by "drying agent will dry out"?

Anhydrous means it contains no water. I suppose this is what vacuum filtration is:



From another source:

One of the main problems in the drying process is that the equilibrium above is shifted to the left if the mixture is heated (increase in entropy!) in most cases unless the water is chemically destroyed. Therefore, the drying agent has to be removed (by filtration or decanting) from the dry solution prior to removal of the solvent. Drying agents like Drierite or molecular sieves can be recycled several times by heating them to an appropriate temperature.
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qPaladin Author
wrote...
11 years ago
What do you mean by "drying agent will dry out"?

Anhydrous means it contains no water. I suppose this is what vacuum filtration is:



From another source:

One of the main problems in the drying process is that the equilibrium above is shifted to the left if the mixture is heated (increase in entropy!) in most cases unless the water is chemically destroyed. Therefore, the drying agent has to be removed (by filtration or decanting) from the dry solution prior to removal of the solvent. Drying agents like Drierite or molecular sieves can be recycled several times by heating them to an appropriate temperature.

ATTEMPT:
I know that in vacuum filtration, the desired product is the precipitate that remains on the Buchner funnel (solid), while the undesired compound is removed by being sucked into the flask by the vacuum in the form of a liquid.

Thus, vacuum filtration is for removing liquid from solid, while to filter off a drying agent would mean to remove the solid (drying agent) from the liquid, which may be the purpose of gravity filtration.
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