Author Topic: Anhydrous HCL using a microwave  (Read 2646 times)

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TrickEMethod

  • Guest
Anhydrous HCL using a microwave
« on: November 06, 2002, 09:45:00 AM »
Someone may have already found this(I admit I havn't UTFSE).  But I thought this was interesting...



Preparation of Hydrogen Chloride.
     Gaseous hydrogen chloride (HCl) is generated by heating 2.0 g anhydrous sodium hydrogen sulfate (sodium bisulfate) NaHSO4 (or 2.3 g sodium hydrogen sulfate (sodium bisulfate) monohydrate NaHSO4.H2O)  and 1.0 g sodium chloride, NaCl together in a test tube by the Thermal Method (See details) according to the reaction:

NaHSO4(s) + NaCl(s)   HCl(g) + Na2SO4(s)

     Our original article called for heating the mixture with a Bunsen burner flame.  Here we report that similar results can be obtained with a microwave oven.  The general procedure described for methane is followed, except that a smaller test tube is used.  It typically takes 2 - 3 minutes in a microwave oven running on the highest setting to generate 50-mL HCl(g).  Check the progress of the reaction every 30 seconds.

     We have described eight experiments that can be performed with gaseous hydrogen chloride. (See details)




I would guess the HCL to be anhydrous, which could be interesting.

Here is the URL.

http://mattson.creighton.edu/MicrowaveMethod/




And on the eight day, God created Meth...
... and hasn't done much of anything usefull since!

dwarfer

  • Guest
very interesting
« Reply #1 on: November 07, 2002, 07:41:00 PM »
A new way..":<)

I think the (in)famous aquarium pump air blower may find
a new use....

":<)

cool..

dwarfer

El_Zorro

  • Guest
So how does it do when you substitute NaBr or NaI ...
« Reply #2 on: November 07, 2002, 10:38:00 PM »
So how does it do when you substitute NaBr or NaI for NaCL?

Who is that masked man?

TrickEMethod

  • Guest
One question that still lingers in my mind is ...
« Reply #3 on: November 08, 2002, 02:18:00 PM »
One question that still lingers in my mind is whether the mono-hydrate would result in H20 vapor being present in the HCL vapor.

I guess you would find out when you started gassing!

And on the eight day, God created Meth...
... and hasn't done much of anything usefull since!

TrickEMethod

  • Guest
Thinking back on this, I too am curious what ...
« Reply #4 on: December 17, 2002, 02:42:00 PM »
Thinking back on this, I too am curious what would result from heating other metal halides with sodium hydrogen sulfate... 

Could this be possible...

  NaHSO4(s) + NaI(s) ->  HI(g) + Na2SO4(s)

If so, I would assume that you could lead a small tube out of the microwave and catch the hydrogen iodide in water.

If you guys say this might work, a friend of mine is willing to tear up a microwave, I happen to have a microwave leakage detector that's long overdue for use in a major felony. 8)

Let me know,
TrickE

And on the eight day, God created Meth...
... and hasn't done much of anything usefull since!

Rhodium

  • Guest
Sulfate may oxidize HI to I2, unfortunately.
« Reply #5 on: December 18, 2002, 12:01:00 AM »
Sulfate may oxidize HI to I2, unfortunately. Use phosphoric or phosphorous acid instead.

TrickEMethod

  • Guest
Let me see if I understand, cuz that sounds ...
« Reply #6 on: December 18, 2002, 09:27:00 AM »
Let me see if I understand, cuz that sounds interesting.

  Phosphoric + NaI + microwave heating -> HI

That would be cool as shit.  What concentration of Phosphoric would you think necessary to have a decient chance of success?  The 20-25% stiff falls off of trees, the 70% is a bit harder to get, but doable if required.

And on the eight day, God created Meth...
... and hasn't done much of anything usefull since!

Rhodium

  • Guest
Try to adapt http://www.rhodium.
« Reply #7 on: December 18, 2002, 09:13:00 PM »