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Author: Subject: Freeze drying question
scienceboi
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[*] posted on 17-1-2021 at 20:13
Freeze drying question


Let's say you have some fruit that you'd like to freeze dry and you don't have a freeze dryer. Could you freeze the fruit and then quickly take them out of the freezer and placed them in a vacuum chamber and reduce pressure?

Poor man's freeze drying if you will.




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SWIM
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[*] posted on 17-1-2021 at 20:41


Freeze drying takes a while.

Many hours, maybe a day or two.

Gotta keep it frozen while it dries.

You might be able to dry the stuff in lyophilization flasks inside a freezer if you drill a hole in the freezer for a vacuum line.

Freeze drying takes a pretty good vacuum as you're actually sublimating the ice.




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[*] posted on 24-1-2021 at 10:09


I thought the "freeze" part happened by itself? Like, due to the water boiling off in the vacuum. Does that not happen?
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[*] posted on 24-1-2021 at 10:40


You freeze them, then you apply vacuum to them for the water to sublime away.

https://www.youtube.com/watch?v=0S478SSnZoQ
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