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Author: Subject: Heat pack type reaction. Please provide thoughts.
Daffodile
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[*] posted on 9-3-2017 at 20:42
Heat pack type reaction. Please provide thoughts.


Hey, just thought I'd ask for some suggestions right now to help with a recent project.

I need a portable way to produce heat, ideally by a 'heat pack' type of device with a chemical reaction, that would reach 120 to 170 degrees C. Does anyone have any ideas?

I was thinking the two reagents would be suspended or dissolved in dryish glycerin (which boils at over 200 C), and could be poured together to react and produce heat.
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CuReUS
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[*] posted on 9-3-2017 at 22:23


you could use the FRH from a MRE-https://en.wikipedia.org/wiki/Flameless_ration_heater

[Edited on 10-3-2017 by CuReUS]
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Daffodile
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[*] posted on 10-3-2017 at 09:45


Great idea thanks.
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Alkemist
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[*] posted on 10-3-2017 at 15:03


A potential issue with ration heaters is that they only gonna reach 100 c....If you need a temp range of 120c-170c these obviously will not suffice. I assume you suggested glycerine so as to be able to achieve Temps higher than 100c? Perhaps a little more info such as its intended use we could be of more help. Is toxicity of concern? Etc.
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Daffodile
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[*] posted on 11-3-2017 at 11:37


Toxicity is not a concern, I just need a portable method pf heating a volatile liquid without using flame.
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CuReUS
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[*] posted on 11-3-2017 at 11:50


Quote: Originally posted by Alkemist  
A potential issue with ration heaters is that they only gonna reach 100 c

How do you know they will reach only 100'C ?
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Daffodile
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[*] posted on 11-3-2017 at 17:33


Quote: Originally posted by CuReUS  
Quote: Originally posted by Alkemist  
A potential issue with ration heaters is that they only gonna reach 100 c

How do you know they will reach only 100'C ?


Because the reaction boils the heat pack water.
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phlogiston
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[*] posted on 11-3-2017 at 18:13


Maybe you can use a salt solution instead of water to raise the boiling temperature.

Supposedly, a solution of NaCl + NaNO3 + KNO3 can have a boiling temperature as high as 196 deg C:

https://e-reports-ext.llnl.gov/pdf/312476.pdf

[Edited on 12-3-2017 by phlogiston]




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Alkemist
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[*] posted on 11-3-2017 at 18:57


Ya, what daff said
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CuReUS
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[*] posted on 12-3-2017 at 02:22


Quote: Originally posted by Daffodile  
Quote: Originally posted by CuReUS  
Quote: Originally posted by Alkemist  
A potential issue with ration heaters is that they only gonna reach 100 c

How do you know they will reach only 100'C ?

Because the reaction boils the heat pack water.

What I meant was,why would it not go any higher than 100'C.But I get it now.The reaction needs water to run,so if the water boils off,it will stop.
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A Halogenated Substance
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[*] posted on 22-3-2017 at 09:39


There is a video on sodium acetate raising the temperature of water upon recrystallizing:

https://youtu.be/CAwxhAP9mnc

I don't think it's gonna get a heat pack up to 100 degrees Celsius though.

If toxicity isn't a concern then why not just combine sodium hydroxide or concentrated sulfuric acid with water?
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[*] posted on 23-3-2017 at 02:34


Could you make a container with cut up the heaters and then you can add water. So you might have to add water to have the correct temp. This works in my head, it might not work in practice.



Go look on my not very good (or accurate) YouTube channel. Link: https://m.youtube.com/channel/UCH8ZTfvZcsKCGzZB1xhjMgg
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