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> Mercury Vacuum Still -- Gimmick?
thegreenimp
post Sep 8 2012, 10:02 PM
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QUOTE(Tibro @ Sep 8 2012, 03:47 PM) *
But aren't vacuum stills used to obtain those oh so desirable hydrocarbon fuels we're all so dependent on? The fractions of which come across at different points and which we use, not the sludge left behind.


A fractionating tower is a wee bit different, from my days of modeling refineries.


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Provenance
post Sep 9 2012, 01:42 AM
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QUOTE(Artemis @ Sep 8 2012, 12:28 PM) *
Sometimes you can get a spade's work done with a hoe, but that don't make it so, ya know?

Angelfood was no hoe.


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Tibro
post Sep 9 2012, 06:23 AM
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QUOTE
The intent is entirely relevant to the selection of the device to be used for the process (still vs. evaporator).

And yet an evaporator can be used to obtain the same results that one can achieve using a still. Without modification and without damage to the apparatus. I imagine same goes for using a still to do the work of an evaporator. If the two are functionally interchangeable then what's the difference?

A spade and a hoe are not interchangeable. On the other hand, if I consider a spade and a shovel then I begin to see the difference.


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Artemis
post Sep 9 2012, 04:25 PM
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QUOTE
I imagine same goes for using a still to do the work of an evaporator.

That's the nice thing about imagination, you can take it anywhere and don't even have to dress it up.


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Tibro
post Sep 9 2012, 05:45 PM
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But even with a good imagination it still's better with hand cream.


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R3al Caravano
post Sep 27 2012, 02:56 AM
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Yes, Mercury is a measure of vacuum as I am sure is said. Any vacuum apparatus of size does not use oil; this is reserved to little piss ass lab units. The general question remains why would you use vacuum to distill something with an azeotrope (especially with a high relativity difference between the items that azeotrope)? In this there lies no advantage in either an energy or a degradation standpoint. (You might as well use benzene like they did in the 50s.) If any of you money fuckers have not figured this out as of yet: the Pressure, Temperature, Concentration (alcohol to water ratio) is set by physics. There is 2 degrees of freedom ie you set two of the three said conditions the other is set by the natural laws governing our universe (physics). This means if you have a given concentration of booze to water in your pot at a given time and you work at a set pressure the the temperature is not under your control. (This was well documented before any of your grandparents were born.) To make the story short if you want more essential oil: increase the water content in the pot and/or increase the pressure.

This shit is getting boring.


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G&C
post Sep 27 2012, 03:13 AM
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Just like instant jello…


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Artemis
post Sep 27 2012, 03:59 AM
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QUOTE
The general question remains why would you use vacuum to distill something with an azeotrope (especially with a high relativity difference between the items that azeotrope)?

The fact that ethanol and water form an azeotrope has nothing to do with the reason for using the vacuum. The vacuum is used to lower the boiling point of the solvent containing the essential oils. The implications of extracting essential oils from plant material without heating them much above room temperature are obvious. Or should be.
QUOTE
In this there lies no advantage in either an energy or a degradation standpoint.

You're wrong. Avoiding degradation caused by heat is precisely the advantage.
QUOTE
the Pressure, Temperature, Concentration (alcohol to water ratio) is set by physics.

No, the ethanol to water ratio is set by the distiller when making absinthe. Without a vacuum, he has no control over the pressure in the system, and thus, none over the boiling point of said ethanol/water mixture. With a vacuum, he has that control.
QUOTE
This means if you have a given concentration of booze to water in your pot at a given time and you work at a set pressure the the temperature is not under your control.

If by "the temperature" you mean the boiling point of the mixture in the still, this is true with an ordinary still. But with a vacuum still, the boiling point of the mixture in the still is entirely under your control due to your control of the pressure in the system. This is the whole point.
QUOTE
To make the story short if you want more essential oil: increase the water content in the pot and/or increase the pressure.

Increasing the pressure will at some point mean no vaporization. That's why pressurized water reactors contain water at 650 degrees F with no boiling. Getting back to a still, no oils can be extracted at all with no vaporization, and increasing the pressure would require a greater input of heat to drive vaporization, so I don't see why you would want to increase the pressure. In any case, vacuum distillation has to do with the QUALITY of the oil, not the quantity.
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This shit is getting boring.

Boring is bad, but wrong is worse.


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Donnie Darko
post Oct 28 2012, 10:17 PM
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Haven't had time to log in in many moons, but everything Artemis said is true.
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post Oct 29 2012, 02:15 PM
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Yo, D-Squared, you stayin' dry?


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G&C
post Oct 29 2012, 02:56 PM
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Didn't he just post that he was getting drunk?


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Tibro
post Oct 29 2012, 03:02 PM
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Inundated wuz what it sounded like.


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Provenance
post Oct 29 2012, 07:42 PM
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QUOTE(Donnie Darko @ Oct 28 2012, 02:17 PM) *
everything Artemis said is true.

You're right, he's drunk.


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Jaded Prole
post Oct 29 2012, 07:49 PM
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And you?


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Donnie Darko
post Oct 30 2012, 12:50 PM
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QUOTE(Provenance @ Oct 29 2012, 10:15 AM) *

Yo, D-Squared, you stayin' dry?

Well luckily I don't live in the neighborhood that's under water now, so yeah, all is well in Brooklyn.
Sadly the liquor I've had the last two nights has been the first opportunity to do so in months. I really need to pick the habit back up, I hear it's good for your cholesterol.
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