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Specialty Chemistry Forums => Chemical Engineering Forum => Topic started by: jt314 on April 21, 2010, 10:46:51 AM

Title: Endothermic Reactions for Food Storage
Post by: jt314 on April 21, 2010, 10:46:51 AM

Hi

I'm an Engineering Student and I need some Chemistry Help.

I know it’s possible to have chemical ice packs that when activated will become very cold but then once they are used up they are finished with.

What i want to know if it’s possible to 'recharge' the ice pack, like a battery, so that it can be activated again. Please note that for my particular situation it would not be possible to freeze the ice packs again.

Is there some way of separating the chemicals by electrolysis?

If not are there other ways to 'recharge' them

Cheers

Title: Re: Endothermic Reactions for Food Storage
Post by: eugenedakin on April 25, 2010, 08:09:59 AM

Hi jt314,

Each country has different specifications and limits as to the products used for food processing.

Which products are you able to use in the country you are currently residing?

Sincerely,

Eugene

Title: Re: Endothermic Reactions for Food Storage
Post by: jt314 on April 27, 2010, 12:10:56 PM

The country is India and its for a small farming comunity.

Title: Re: Endothermic Reactions for Food Storage
Post by: 408 on April 28, 2010, 02:39:57 AM

Instant cold packs often contain ammonium nitrate.  If the country of manufacture has jumped on the paranoia bandwagon they might contain urea instead.  In either case, opening the instant cold pack, and drying the solution to a powder, will produce the original material, that when dissolved again, will produce the same cooling effect.