what temperature does freeze drying take a few hours to "suck" all of the water out of something like popcorn

Question

this for a project in my chem class. it is supposed to be one of those real life problems and i need to figure out away to remove water from popcorn and i came up with freeze drying. so i need to remove the water from the popcorn in a matter of a few hours. if the freezer is cold enough then the water will sublimate out in a few a hours so i need to know how cold the freezer needs to be.

this for a project in my chem class. it is supposed to be one of those real life problems and i need to figure out away to remove water from popcorn and i came up with freeze drying. so i need to remove the water from the popcorn in a matter of a few hours. if the freezer is cold enough then the water will sublimate out in a few a hours so i need to know how cold the freezer needs to be.
i need some additonal information. does the process of sublimation of water occur at a faster rate at the triple point of water, and what is the triple point of water?

Answer 1

FREEZE DRYING

The usual way of drying (dehydrating) substances or objects, is to use a desiccant solid or liquid to adsorb or absorb water, or to drive out the moisture by addition of heat - i.e. by evaporation.

Some substances cannot be dried by heating as they may be sensitive to heat or they cannot be contacted with a desiccant in case of contamination.

In these cases, a system called 'Freeze Drying' is used to remove the moisture.

The process consists of freezing the material to be dried, to between – 20 °C and – 25 °C.
It is then placed inside a chamber where the temperature is allowed to rise slowly.

The slow temperature increase causes 'Sublimation' of the ice particles to take place.
This is a process wherein the solid ice changes to water vapour directly with no liquid phase.

Dry air or inert gas passed through the chamber, carries away the water vapour leaving a freeze-dried product.

Answer 2

Ummm yeah. What Norrie said. And it depends on whether butter and salt was added. Freeze drying happens fast and utilizes something super cold, like liquid nitrogen or something. Dehydration happens slower and utilizes heat and time and leaves a minimal amount of liquids.

Answer 3

this web site should have the answer but you will have to dig some good luck