How do you freeze dry liquid?

Question

Freeze dry liquid to be rehydrated at a later date.

Answer 1

Remove any unbound water molecules with a method appropriate to the particular material. Then, lower its temperature below its freezing point.

If you're talking about dehydrating a carbohydrate, you're making fundamental changes to its chemical structure. In this case, 'freeze dry' is a misnomer.

If you're just playing word games, then it's cheaper to just buy a packet of instant water. To use at a later date, follow the instructions and 'just add water'.

Answer 2

This question does make a lot of sense. The individual is asking about freeze drying a product that is typically consumed as a liquid.

I wish I could ever look at these replies and see some patient, thought out answers. Instead it is quick replies pointing out how incorrect some aspect of the question seemed. Ever heard of freeze dried coffee you know it alls?

What is necessary first is to freeze the prepared liquid like coffee, kava drink, milk or any of the MANY liquids that are freeze dried regularly. The frozen solution is then placed under vacuum until the pressure is below the triple point of water, so it can only exist in a solid or gaseous phase.

Once sufficient vacuum is achieved the product can be warmed and the water will NOT melt, it will sublimate directly into a gas.

The vapor is usually condensed immediately back into solid ice on some colder surface sharing the same vacuum space, referred to as a cold trap. This prevents the loss of vacuum as the solid water expands into gaseous water.

Answer 3

Freeze drying is pumping a vacuum on something after it is frozen. The vacuum causes the water that is in the object to evaporate away without causing boiling to occur. It is just one of the methods of dehydrating objects. Freeze drying is usually used on things that might tend to rot if dried at higher temperatures.

The other way to dry something is to get it hotter than the air around it without putting it in a vacuum. So that the heat drives the water out instead of the vacuum pulling the water out.

Answer 4

Your question doesn't really make any sense - freeze drying is the process of removing liquid from an otherwise solid material, and the process is nothing more than vaporizing the moisture, freezing it, and removing it. You obviously cannot remove moisture from a liquid - you can only change a liquid to a solid or gas.

Answer 5

it's obvious if it is dry it can't freeze,but you can vacuum pack it and then toss it in the freezer just to keep everything dormant.