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Topic: Hydrofluoric Acid Purification  (Read 6106 times)

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Offline thaqrhys

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Hydrofluoric Acid Purification
« on: November 27, 2007, 11:48:06 PM »
Hello everyone,

How can I purify Hydrofluoric Acid 55 % in order to get Anhydrous HF ?

Thanks before.


Offline agrobert

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Re: Hydrofluoric Acid Purification
« Reply #1 on: November 27, 2007, 11:55:38 PM »
Call Honeywell.
In the realm of scientific observation, luck is only granted to those who are prepared. -Louis Pasteur

Offline thaqrhys

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Re: Hydrofluoric Acid Purification
« Reply #2 on: November 28, 2007, 12:01:39 AM »
Thanks for the advice.

Is there any other way that i could do it on my own ?

I only need it in small amount, say a liter or two.



Offline thaqrhys

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Re: Hydrofluoric Acid Purification
« Reply #3 on: November 28, 2007, 10:03:28 PM »
Call Honeywell.

My position is in Indonesia. I've emailed Honeywell, but still no answer.

Does anyone in here have some experiences in purifying acid ( H2SO4 or HCl or others )?
Maybe I could apply the similar techniques for purifying HF.

Offline lemonoman

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Re: Hydrofluoric Acid Purification
« Reply #4 on: November 28, 2007, 10:43:51 PM »
Question for other people, which might contribute and might not:

Could you electrolyse the water at a potential difference of 0.4 V to turn the water into H2 and O2, while keeping the HF?

Given:

F2(g) + 2e- --> 2 F-(aq)        E0 = +2.87 V
2 H+(aq) + 2e- --> H2(g)       E0 = 0.00 V

Offline thaqrhys

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Re: Hydrofluoric Acid Purification
« Reply #5 on: November 30, 2007, 03:43:24 AM »
I'm afraid it couldn't be happen.

Since HF is a weak acid, instead water ionizes, we will get H2 and F2. CMIIW

thanks so much anyway for your advice.

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