Hello Nick,
> Sucrose, our regular table sugar, one pound of it will make 299 ml.
> of pure ethanol. yeast will stand up to 11% of alcohol concentration
> >before slowing down.
The owner of my brew supplies shop told me that she can supply me with
yeast strains that can ferment to 14% alcohol.
>I got up to 95% sugar utilization after repeat fermentation. .
I'm not familiar with "repeat fermentation". Is fermentation repeated
because the ferment reached the yeast's limits of alcohol tolerance before
the sugar was completely utilized?
Can one expect to achieve 95% sugar utilization in a single ferment if
consideration is given to "sugar" to volume ratio and yeast tolerance for
alcohol.
Ex. 299 ml ethanol (from 1 lb sucrose) = 11% of 2.7 L.
If one dissolved 1 lb of sucrose in enough water to give 2.7 L of solution,
using the same yeast you had used, would you get close to 11% ethanol on a
single ferment?
Or In practice must fermentable sugars be in excess of this calculated
amount in order to reach the upper ethanol concentration?
I've seen recipes for preparing the mash for fermentation. I don't know
if consideration is given to complete "sugar utilization", or simply
achieving the upper limits of ethanol concentration for the strain of yeast
employed, without regard for complete sugar utilization.
My questions go to point that you were able to achieve 95+% completion,
and the fact that, in practice, we would like to maximize ethanol output as
well as achieving complete sugar utilization.
Tom
----- Original Message -----
From: "NV Dhana" <[EMAIL PROTECTED]>
To: <biofuel@sustainablelists.org>
Sent: Wednesday, April 18, 2007 10:58 PM
Subject: Re: [Biofuel] Ethyl Esters (was Biodiesel "New Process")
> Hi Ken Provost, I tried it in My garage.I borrowed the yeast from local
> wineary. Sucrose, our regular table sugar, one pound of it will make 299
> ml.
> of pure ethanol. yeast will stand up to 11% of alcohol concentration
> before
> slowing down. I got got up to 95% sugar utilization after repeat
> fermentation.Distilation of ethanol was done by counter current
> distilation.
> It is bit expensive, about 12.5 lb sugar will give you one gallon of
> ethanol. so we must have cheaper source of fermentable sugar. Nick Dhana
>
>
>>From: Ken Provost <[EMAIL PROTECTED]>
>>Reply-To: biofuel@sustainablelists.org
>>To: biofuel@sustainablelists.org
>>Subject: Re: [Biofuel] Ethyl Esters (was Biodiesel "New Process")
>>Date: Wed, 18 Apr 2007 18:58:58 -0700
>>
>>
>>On Apr 18, 2007, at 10:42 AM, Thomas Kelly wrote:
>>
>>
>>>Is it actually possible for a person to produce 99+% pure ethanol using
>>>readily available materials,
>>>and at reasonable cost, or must it be produced on an industrial scale?
>>>Are any of you making it "in
>>>your backyard"?
>>
>>
>>I have actually made it (in the garage, not the backyard:-)) from white
>>sugar and a bag of TurboYeast
>>from Gert Strand (sp?), then distilled it and dried it with zeolite, and
>>then used it for biodiesel. It's a
>>PITA, but possible. The EROI could be favorable if you started with the
>>right crop, kept your enzymes
>>and yeast going like a sourdough starter or made your own malt from
>>scratch, and did your distillation
>>in a solar still. I'll try all that if I ever finish this $%&[EMAIL PROTECTED]
>>strawbale house. 'Till then I'm back to petrodiesel
>>or methyl esters :-(
>>
>>-K
>
>
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