OK..... Mmmmmm - Love that creamy foamy tan head....
Here we go. Info on the boiling points of alcohol and the combined alcohol and water solution.
https://www.chemguide.co.uk/physical/phaseeqia/nonideal.html
Boiling point / composition diagrams for non-ideal mixtures A large positive deviation from Raoult's Law: ethanol and water mixtures If you look back up the page, you will remember that a large positive deviation from Raoult's Law produces a vapour pressure curve with a maximum value at some composition other than pure A or B.If a mixture has a high vapour pressure it means that it will have a low boiling point. The molecules are escaping easily and you won't have to heat the mixture much to overcome the intermolecular attractions completely.The implication of this is that the boiling point / composition curve will have a minimum value lower than the boiling points of either A or B.In the case of mixtures of ethanol and water, this minimum occurs with 95.6% by mass of ethanol in the mixture.
The boiling point of this mixture is 78.2°C, compared with the boiling point of pure ethanol at 78.5°C, and water at 100°C.You might think that this 0.3°C doesn't matter much, but it has huge implications for the separation of ethanol / water mixtures.The next diagram shows the boiling point / composition curve for ethanol / water mixtures. I've also included on the same diagram a vapour composition curve in exactly the same way as we looked at on the previous pages about phase diagrams for ideal mixtures.
Then there is COLD distillation.
Melting point: ethanol: −117.
http://boards.straightdope.com/sdmb/showthread.php?t=561746
#1 05-02-2010, 06:08 PMTaenia spp. Guest Join Date: Oct 2008Location: Bay Area, CaliforniaPosts: 275Melting Point of an Ethanol/Water MixtureI've been storing spirits (40% ABV) in the freezer and they've always remained liquid at that temperature. Recently, in my naive understanding, I placed a bottle of vermouth (18% ABV) in there and was surprised to find the next day all I had was a bottle of hard slush. This got me thinking: at what proportion of alcohol will that solution not freeze at typical freezer temperatures?In my dim memory of chemistry, I remember that a mixture of two miscible compounds will have a melting point (freezing point) lower than the melting point of each compound individually, with a sharp depression at the eutectic point. Is there anywhere to find an ethanol-water melting point curve?I suppose for the purposes of this question, we might first consider a solution of pure ethanol and water without impurities, but we could also consider the effects of the various other compounds typically found in alcoholic beverages.
The links from that comment.
https://www.engineeringtoolbox.com/ethanol-water-d_989.html
Ethanol based Water Solutions Freezing Point
Freezing Point
Ethanol Concentration
(% by volume) 0 10 20 30 40 50 60 70 80 90 100
(oC) 0 -4 -9 -15 -23 -32 -37 -48 -59 -73 -115
Example - Ethanol Concentration at Freezing Point at -20oC
The ethanol concentration with freezing point at
-20oC can be calculated by interpolating the concentration between freezing point
-15oC and
-23oC in the table above.
(((40%) - (30%)) / ((-23oC) - (-15oC))) ((-15oC) - (-20oC)) + (30%) = 37.3 %
This calculation is simplified by assuming that the concentration vs. freezing point follows a straight line. This not necessary correct.
If a
90% ethanol-water solution shall be mixed with clean water to achieve a freezing point of
-20oC (ethanol concentration
37.3% (0.373)) - the amount of added water can be calculated with volume balance - the amount of ethanol before mix is the same as after the mix:
cs Vs = cm (Vs + Vw) (1)
where
cs = concentration in ethanol - water solution
Vs = volume of the ethanol - water solution (liter, gallon)
cs = concentration in mix
Vm = volume of mix (liter, gallon)
Vw = volume of the added clean water (liter, gallon)
Rearranging the equation to express the volume of water added to the mixture
Vw = (cs - cm) Vs / cm (1b)
Substituting with values
Vw = (0.9 - 0.373) Vs / 0.373
= 1.41 Vs
- for every liter
90% ethanol-water solution
1.41 liter of clean water must be mixed in to achieve an ethanol concentration of
37.3% and freezing point
-20oC.
https://commons.wikimedia.org/wiki/File:Phase_diagram_ethanol_water_s_l_en.svg
The freezing point of water alcohol solutions based upon alcohol content and temperature.. (stout however, is not a simple water alcohol blend - freezing point - much lower)
I think the way to go is to fractionally distill the beer at say -5*C by dripping it over a big alumium tray, at a slight tilt, at perhaps -20*C.... inside a chest freezer
I suppose that one could actually measure the freezing point of the combined water and alcohol, and then set the freezer to run at just above that. This way you should end up with a block of frozen beer and all the run off is the distillate.
Or one could chill a bottle of Coopers stout to 0*C, then decap it, and then put it back into the chest freezer on a pie dish, and by slowly chilling it further, the water and water based compounds should settle to the bottom of the bottle and the alcohol and the combined water and alcohol, all being lighter fractions, ought to rise to the top of the bottle, and as the water based beer begins to freeze, it should expand and push the alcoholic liquids out.
Coopers
Best Extra Stout has 6.3% alcohol., so out of a 750ml bottle, it ought to exude around about 48ml, but 70ml will do - including a little extra for certainty..
I think an extremely slow chilling, and a measured exudance, as the stopping point, and a removal from the deep freeze and a recap....
Or I could simply prepare the beer kit more or less as per instructions, minus the yeast and the sugar, and the fermentation, and then just drink that - make it up like beer cordial and throw some CO2 into it...
I'd just like a few great big pint glasses of it now and then... while keeping a clear head, a sober license, and not nodding off and going into a tree or the oncoming traffic.....
That lovely warm afternoon sun on the chest and belly...... A very early start, a decent lunch, a long trip, and coming home - that sun - it's like a giant sleeping pill.....
