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Sir_Gawain
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You could just add an excess of sulfuric acid to convert it all into bisulfate.
“Alchemy is trying to turn things yellow; chemistry is trying to avoid things turning yellow.” -Tom deP.
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Nikotin
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Because there are not enough K+ Ions, so only one per sulfuric acid molecule(=potassium bisulfate), instead of two (potassium sulfate), right?
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Keras
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Quote: Originally posted by Nikotin  | | Because there are not enough K+ Ions, so only one per sulfuric acid molecule(=potassium bisulfate), instead of two (potassium sulfate), right?
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That'a way to see things. The (mostly accepted) view is one of pH equilibrium. KHSO₄ is a weak acid, therefore the proportion of KHSO₄ vs
K₂SO₄ is pH dependent. But both are equivalent. That is, if you start from one mole of H₂SO₄ and add one mole of KOH, considering that the
former is a strong acid and the latter a strong base, you should end up with one mole of KHSO₄. But since that KHSO₄ is in solution in water,
there will be a non-zero number of HSO₄⁻ anions that will give away a proton to a water molecule and transform into SO₄²⁻, which you can
consider as diluted potassium sulphate.
Beside, if you heat it over 600 °C, potassium bisulphate will lose SO₃ (that you can make sulphuric acid back with) and transform into potassium
sulphate:
2 KHSO₄ → K₂SO₄ + SO₃ + H₂O
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Rainwater
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| Quote: | | Beside, if you heat it over 600 °C, potassium bisulphate will lose SO₃ (that you can make sulphuric acid back with) |
I tried that once, not willing to do it again.
That stuff is nasty. Like really nasty, total containment is a must.
It eats gloves, mask, wood. Watch my new tongs rust before my eyes.
Leave that reaction to the professionals please.
"You can't do that" - challenge accepted
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Keras
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| Quote: Originally posted by Rainwater | | Quote: | | Beside, if you heat it over 600 °C, potassium bisulphate will lose SO₃ (that you can make sulphuric acid back with) |
Leave that reaction to the professionals please. |
I’m not sure why you say that. The setup is very simple and there is really little danger if you do things correctly. I use a quartz tube, a
borosilicate bent tube and a condenser. Of course, do that outside. My starting point is sodium bisulphate, that you can buy cheaply as pH minus for
swimming pool. I got 5 kg for 2 € at the local LIDL.
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akmetal
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I am happy I found this site. I have built a lab to make 99.X% nitric and going through the struggles
Stopping NO2 leaks and corrosion is the first thing - I found these along with the PTFE coated metal clips (https://www.labunlimited.com/cms.jsp?menu_id=29544&descr...)
I installed a separate birkeland eyde reactor that will have a cooled liquid jacket and stiring and I am going to heat the NO2 post arc reactor.
The first stage distillation to 68% nitric seems to be straight forward with a glass rashing ring distillation stage I just need to seal it up, got up
to about 110 F in the bulb then just started running out of liquid which suggests poor yield in the creation of dilute nitric.
I have a separate still for distilling sulpheric and still need to break up a bunch of tiny glass for that still.
It sounds like from above the best mixture for the final distillation is 50% 90%+ sulpheric and 50% 68% nitric
I hope these little seals work because the thin teflon sleves didnt and its safety first, I will abandon this entire buisness venture if I cant do it
safe.
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Rainwater
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I use a water asporator to place the appratus under reduced pressure.
Any leaks, leak in, keeping total containment.
The asporator with a baking soda solution, is an almost perfect gas scrubber
You get less decomposition of your product.
And of your slick, you can include a bubble capillary to prevent bumping.
"You can't do that" - challenge accepted
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Texium
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Thread Moved
21-11-2023 at 22:18 |
akmetal
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| Quote: Originally posted by Rainwater | I use a water asporator to place the appratus under reduced pressure.
Any leaks, leak in, keeping total containment.
The asporator with a baking soda solution, is an almost perfect gas scrubber
You get less decomposition of your product.
And of your slick, you can include a bubble capillary to prevent bumping. |
Thats a great idea, I just ordered this - https://www.amazon.com/dp/B071X63B2R?psc=1&ref=ppx_yo2ov...
With 24/40 connections - one connection will be the bubbling frit introducing the NO2 another will be a suction tube (I have a 500 micro vacuum pump
connected to the still to create enough vacuum to force the liquid over to the boiler.
The 3rd is the vent that I could put the aspirator on (or eductor maybe?) - can you recommend one that I could use like a fish tank bubbler instead of
water. I dont have water running to this building but i have a large water tank I could circulate with a pump but using air as the motive fluid would
be easier.
Could the still be operated in a similar manner with an asperator on the outlet of the top side condenser it would be mixed phase flow (liquid water
and water vapor mixed with nitric carry over)
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