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Raising boiling point of salt water

by shofarsogood
Tags: boiling, point, raising, salt, water
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shofarsogood
#1
Apr11-09, 08:35 PM
P: 2
How much salt per quart does it take to raise the temperature of water to 325 degrees at 28 PSI?

I am sorry to say I am not educated in physics but I do understand the more particles in the water the higher the boiling point. I am trying to plasticize animal horns in a pressure cooker with a maximum pressure of 28 psi.

Thank you for making this kitchen table ready !

Shalom

Shofarsogood
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alxm
#2
Apr12-09, 03:56 AM
Sci Advisor
P: 1,866
Answer: No amount. Look at a Dühring plot; saturating water with NaCl only raises its boiling point by about 10 degrees C. You can't get up to 325 F without pressures substantially larger than 28 psi.

Then there's also a quite obvious concern about having highly pressurized boiling water around, and using pressure cookers in ways they're not intended.

Why not just use oil instead?
shofarsogood
#3
Apr12-09, 03:02 PM
P: 2
Thanks, for the prompt reply. The dilema is not to cook the horn by using direct heat. I am concerned about the horn becoming brittle. I know it is possible to soften the solid tip deep enough to straighten it sufficiently to drill and form a mouthpiece.

The particular pressure cooker I am using has two saftey devices integral to keep it safe. One is set at 28 lbs PSI, the other is at 40 PSI, (and is not mechanical but a failure point of a rubber plug in case the first fails). The tank itself can go much higher, well over 100 psi without failure. I contacted the design department first to make sure I was not in danger.

Not sure if food safe glycerin would work?

Are there other ways to create moist heat above 300 degrees? I thought about super heating steam.

Any help would be appreciated. The horn is keratin much like a tough fingernail.


Thanks

alxm
#4
Apr12-09, 04:07 PM
Sci Advisor
P: 1,866
Raising boiling point of salt water

Quote Quote by shofarsogood View Post
Not sure if food safe glycerin would work?
That'd work. It's got a boiling point well over 300 (554 F). If you must have some water in it, you could add about 5-10% water (by weight) and get a boiling point at about 300 degrees at atmospheric pressure, according to this table. Should be fairly easy to test yourself, on a stove with a thermometer.

Are there other ways to create moist heat above 300 degrees? I thought about super heating steam.
Yeah well that's what you'd need with just water or water/salt. Most autoclaves don't go that high even (and if you've seen one, they're a lot sturdier than a pressure cooker.) I'd strongly recommend against working at elevated pressures. Worst case scenario doing it the first way is a spill, worst case the latter way means an explosion.


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