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## Alcohol yield

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• The alcohol content of your wash can be worked out even if you do not use a hydrometer. I have condensed some information from 1)
Message 1 of 2 , Apr 30, 2003
The alcohol content of your wash can be worked out even if you do not
use a hydrometer. I have condensed some information from
1) http://www.nysaes.cornell.edu/fst/faculty/acree/fs430/lectures/
thk29yield.html
2) http://listproc.ucdavis.edu/archives/ven3xd/log9911/0000.html
3) The Compleat Distiller, M.Nixon & M.McCaw

In 1810 Guy Lussac proposed a formula for alcohol yield showing that
the chemical conversion of sugar produces 51.1% ethanol by weight.
Alcohol is normally based on volume and as the SG of alcohol is
0.7893, the yield by volume is 64.7%.
This is a theoretical yield, the actual observed yield is 47% by
weight or 59.5% by volume.
100g/litre sugar solution yields 5.95%abv (59.5/1000x100)
so a 17g/l sugar solution yields 1%abv (100/5.95 = 17)
So to work out how much sugar we need to produce a certain alcohol %
abv we use the formula -
g/l sugar = 17 x %abv (or %abv = g/l divided by 17)
e.g. if we want the maximum fermentable sugar for a s. bayanus yeast
which is capable of 18% we need 17 x 18 = 306g/l of sugar.
The amount of sugar for larger volumes is worked out using -
W = 17 x %abv x V
e.g. For a 20litre volume fermenter we need 20x17x18=6120g or 6kg.

Wal
• Thanks very much. So back to my original post. 340 g/L, 20% abv potential, and initial sg 1.149. Final sg @ 20 abv approximately 0.958. Delta is 191
Message 2 of 2 , May 4, 2003
Thanks very much.

So back to my original post.  340 g/L, 20% abv potential, and initial sg 1.149.  Final sg @ 20 abv approximately 0.958.  Delta is 191 degrees, 191/20 = 9.55.  The hydrometer usefull if you don't actually metabolize all of the sugar, and the content of sugar by weight for this case I gave earlier.

Bob
-----Original Message-----
From: waljaco [mailto:waljaco@...]
Sent: Wednesday, April 30, 2003 10:20 PM
To: Distillers@yahoogroups.com
Subject: [Distillers] Alcohol yield

The alcohol content of your wash can be worked out even if you do not
use a hydrometer. I have condensed some information from
1) http://www.nysaes.cornell.edu/fst/faculty/acree/fs430/lectures/
thk29yield.html
2) http://listproc.ucdavis.edu/archives/ven3xd/log9911/0000.html
3) The Compleat Distiller, M.Nixon & M.McCaw

In 1810 Guy Lussac proposed a formula for alcohol yield showing that
the chemical conversion of sugar produces 51.1% ethanol by weight.
Alcohol is normally based on volume and as the SG of alcohol is
0.7893, the yield by volume is 64.7%.
This is a theoretical yield, the actual observed yield is 47% by
weight or 59.5% by volume.
100g/litre sugar solution yields 5.95%abv (59.5/1000x100)
so a 17g/l sugar solution yields 1%abv (100/5.95 = 17)
So to work out how much sugar we need to produce a certain alcohol %
abv we use the formula -
g/l sugar = 17 x %abv (or %abv = g/l divided by 17)
e.g. if we want the maximum fermentable sugar for a s. bayanus yeast
which is capable of 18% we need 17 x 18 = 306g/l of sugar.
The amount of sugar for larger volumes is worked out using -
W = 17 x %abv x V
e.g. For a 20litre volume fermenter we need 20x17x18=6120g or 6kg.

Wal

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