Azeo is 97.2%ABV

Distillation methods and improvements.

Moderator: Site Moderator

Post Reply
Maritimer
Rumrunner
Posts: 716
Joined: Sun Jul 01, 2012 6:09 am
Location: Nova Scotia, Canada

Azeo is 97.2%ABV

Post by Maritimer » Fri Mar 06, 2015 5:58 am

Recently, JacksonBrown showed me that azeo is 95.6%ABW (alcohol by weight), not %ABV (alcohol by volume). This was a total surprise. How many times have we seen pictures of alcoholometers proudly showing 95.6% sitting in a parrot? But alcoholmeters measure in %ABV.

It would make sense that the azeotrope would be given in ABW, as it is insensitive to temperature.

Converting from ABW to ABV gives 97.2%ABV at either 60*F or 20*C (the difference is only 0.003%).

M

User avatar
pfshine
Site Donor
Site Donor
Posts: 3106
Joined: Thu Jan 19, 2012 10:59 pm
Location: Vegas

Re: Azeo is 97.2%ABV

Post by pfshine » Fri Mar 06, 2015 7:12 am

That's why my meter always said 97 when making my neutral.
Life is a journey you take alone. Make sure you do what you what makes you happy

User avatar
still_stirrin
Master Distiller
Posts: 7857
Joined: Tue Mar 18, 2014 7:01 am
Location: where the buffalo roam, and the deer & antelope play

Re: Azeo is 97.2%ABV

Post by still_stirrin » Sun Mar 08, 2015 5:11 am

Not only that but the volumee of the sum is less that the sum of the volumes.

Ethanol-water mixtures have less volume than the sum of their individual components at the given fractions. Mixing equal volumes of ethanol and water results in only 1.92 volumes of mixture. Mixing ethanol and water is exothermic, with up to 777 J/mol being released at 298 K.
ss
Attention new distillers: Cranky's spoon feed info
My LM/VM & Potstill: My build thread
Enzyme info: SebStar
All about mashing grains: Braukaiser

User avatar
thecroweater
Master Distiller
Posts: 6001
Joined: Wed Mar 14, 2012 9:04 am
Location: Central Highlands Vic. Australia

Re: Azeo is 97.2%ABV

Post by thecroweater » Mon May 01, 2017 5:03 pm

OK I'm wondering how to calculate ABW to ABV (at 20'c), a quick look at some beer sites will say abw x 1.25 = abv , (.8 back the other way) I just can't see how that can be right. If 0 abw = 0 abv and 100% abw = 100% abv then I read 3%abw is 4% abv and azeotropic alcohol is 95.63% ABW which equates to 97.2 ABV @ 20'c then a constant and linear fomular is useless. OK so a read that ethanol has a density of .789 ei 1 ltr = .789 kgs , for the non metrics water is 1 liter = 1 kg .
Ok so what I haven't grasped is to calculate properly abw to abv, I get that it won't be linear due to the differential weights of water and ethanol and at every % change so does the ratio.
Those who would give up essential Liberty, to purchase a little temporary Safety, deserve neither Liberty nor Safety. Benjamin Franklin

User avatar
HDNB
Site Mod
Posts: 6590
Joined: Mon Feb 17, 2014 10:04 am
Location: the f-f-fu frozen north

Re: Azeo is 97.2%ABV

Post by HDNB » Mon May 01, 2017 5:18 pm

i put this in the other thread, but it may as well go here too, as it answers the question posed by thecroweater

http://www.cra-arc.gc.ca/tx/tchncl/lchl ... u-eng.html" onclick="window.open(this.href);return false;" rel="nofollow
I finally quit drinking for good.

now i drink for evil.

User avatar
wiifm
Admin
Posts: 43
Joined: Tue May 26, 2015 2:29 am
Location: Cairns QLD Australia

Re: Azeo is 97.2%ABV

Post by wiifm » Mon May 01, 2017 6:03 pm

thecroweater wrote:OK I'm wondering how to calculate ABW to ABV (at 20'c), a quick look at some beer sites will say abw x 1.25 = abv , (.8 back the other way) I just can't see how that can be right. If 0 abw = 0 abv and 100% abw = 100% abv then I read 3%abw is 4% abv and azeotropic alcohol is 95.63% ABW which equates to 97.2 ABV @ 20'c then a constant and linear fomular is useless. OK so a read that ethanol has a density of .789 ei 1 ltr = .789 kgs , for the non metrics water is 1 liter = 1 kg .
Ok so what I haven't grasped is to calculate properly abw to abv, I get that it won't be linear due to the differential weights of water and ethanol and at every % change so does the ratio.
It is my understanding that the relationship is not linear because when you mix a given volume of 100% liquid water and another given volume of 100% liquid ethanol, the resultant volume is less than the total of the two separate volumes. It has something to do with ethanol and water molecules being able to sit closer to each other than themselves in liquid form.

User avatar
thecroweater
Master Distiller
Posts: 6001
Joined: Wed Mar 14, 2012 9:04 am
Location: Central Highlands Vic. Australia

Re: Azeo is 97.2%ABV

Post by thecroweater » Mon May 01, 2017 9:18 pm

OK yes that is for certain a fact but not one I had taken into account. Fuckit that's prolly one to many variables for me to calculate a formula. To me now the controlling factors are varying ratios of different masses along with a varying volume related to those varying masses oh boy that is some tricky maths
Those who would give up essential Liberty, to purchase a little temporary Safety, deserve neither Liberty nor Safety. Benjamin Franklin

Maritimer
Rumrunner
Posts: 716
Joined: Sun Jul 01, 2012 6:09 am
Location: Nova Scotia, Canada

Re: Azeo is 97.2%ABV

Post by Maritimer » Tue May 02, 2017 9:19 am

Hi Crow,

Here is a formula:

%ABW = 0.9538839570686711 + 0.6799353140478662 * x +
0.0029456109658481753 * x^2

where X is %ABV at 20 degrees C.

It is accurate to +/- 0.5% except at very low %ABW (0 to 5%) and very high (around azeo) where it is off by 1%. You can see this because when X = 0, the result is 0.95%. I can generate more accurate equations if desired.

M

Maritimer
Rumrunner
Posts: 716
Joined: Sun Jul 01, 2012 6:09 am
Location: Nova Scotia, Canada

Re: Azeo is 97.2%ABV

Post by Maritimer » Wed May 03, 2017 1:29 am

Here is a much better formula:

%ABW = 0.8225461635345204 *x - 0.0007912419651469305 * x^2+
0.000025170469315263712 x^3

where x = %ABV

Maximum error is 0.3% at x=90

User avatar
thecroweater
Master Distiller
Posts: 6001
Joined: Wed Mar 14, 2012 9:04 am
Location: Central Highlands Vic. Australia

Re: Azeo is 97.2%ABV

Post by thecroweater » Wed May 03, 2017 1:53 am

cheers for that, I'm still reading up on a lot of this as this subject seems to be a major misconception. Not that it really matters for most ppl but I like to have me facts straight.
Those who would give up essential Liberty, to purchase a little temporary Safety, deserve neither Liberty nor Safety. Benjamin Franklin

Post Reply