Daffodile
Hazard to Others
Posts: 167
Registered: 7-3-2016
Location: Highways of Valhalla
Member Is Offline
Mood: Riding eternal
|
|
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.
|
|
|
CuReUS
National Hazard
Posts: 928
Registered: 9-9-2014
Member Is Offline
Mood: No Mood
|
|
you could use the FRH from a MRE-https://en.wikipedia.org/wiki/Flameless_ration_heater
[Edited on 10-3-2017 by CuReUS]
|
|
|
Daffodile
Hazard to Others
Posts: 167
Registered: 7-3-2016
Location: Highways of Valhalla
Member Is Offline
Mood: Riding eternal
|
|
Great idea thanks.
|
|
|
Alkemist
Harmless
Posts: 10
Registered: 9-3-2017
Member Is Offline
Mood: No Mood
|
|
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.
|
|
|
Daffodile
Hazard to Others
Posts: 167
Registered: 7-3-2016
Location: Highways of Valhalla
Member Is Offline
Mood: Riding eternal
|
|
Toxicity is not a concern, I just need a portable method pf heating a volatile liquid without using flame.
|
|
|
CuReUS
National Hazard
Posts: 928
Registered: 9-9-2014
Member Is Offline
Mood: No Mood
|
|
How do you know they will reach only 100'C ?
|
|
|
Daffodile
Hazard to Others
Posts: 167
Registered: 7-3-2016
Location: Highways of Valhalla
Member Is Offline
Mood: Riding eternal
|
|
Because the reaction boils the heat pack water.
|
|
|
phlogiston
International Hazard
Posts: 1379
Registered: 26-4-2008
Location: Neon Thorium Erbium Lanthanum Neodymium Sulphur
Member Is Offline
Mood: pyrophoric
|
|
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]
-----
"If a rocket goes up, who cares where it comes down, that's not my concern said Wernher von Braun" - Tom Lehrer |
|
|
Alkemist
Harmless
Posts: 10
Registered: 9-3-2017
Member Is Offline
Mood: No Mood
|
|
Ya, what daff said
|
|
|
CuReUS
National Hazard
Posts: 928
Registered: 9-9-2014
Member Is Offline
Mood: No Mood
|
|
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.
|
|
|
A Halogenated Substance
Hazard to Self
Posts: 68
Registered: 7-2-2017
Location: United States
Member Is Offline
Mood: Oxidizing due to extended exposure to oxygen
|
|
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?
|
|
|
Liamatpm
Harmless
Posts: 48
Registered: 7-12-2016
Location: Maine
Member Is Offline
Mood: Using the process of cellular respiration to stay (barely) alive
|
|
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.
|
|
|
![[*]](images/xpblue/default_icon.gif){kind=icon}
