Year: 1887

page_text: Date of Application, 22nd Mar., 1887
Complete Left, 13th Dec., 1887
Complete Accepted, 13th Jan,
1888
I, ARCHIBALD WALKER of 4 Muirhead Street in the City of Glasgow, Distiller do
hereby declare the nature of this Invention to be as follows:-
According to my Invention I prepare a mixture of malt, grist or of grain and malt
grist and hot water and I leave this mixture to saccharify for one or two hours the
temperature being preferably maintained at about 142° Fahrenheit. After slightly
cooling 1 mix with it some sulphuric acid which has previously been diluted
with 4 or 5 times its weight of water. The quantity of concentrated sulphuric acid
used is preferably about one half per cent to one per cent of the weight of the grist.
The mixture is allowed to stand for from 3 to 10 hours during which time the
temperature should be kept at above 112° Fahrenheit. The sulphuric acid is then
almost completely neutralized which may be effected by the addition of Caustic potash
Soda or Ammonia or the Carbonates of Potassium, Sodium or Ammonium. 1 generally
prefer to use Carbonate of Potash or commercial Carbonate of Ammonia. I then add
water and concentrated spent wash which has been previously clarified, heated (if
necessary) for some time under pressure and then concentrated by evaporation. The
mixture is then cooled preferably to about 65° Fahrenheit and is put into fermentation
with yeast or with a portion of a previous "yeast mash" which has been kept over
for the purpose. The mixture is allowed to ferment generally for from 8 to 14 hours.
Afterwards this mixture or "yeast mash" is used for inducing fermentation in a
relatively large quantity of wort preferably at a temperature of about 77° Fahrenheit
a strong production of yeast takes place and after a time the yeast is collected and
prepared for the market.
T
13- 03
1
Ր A.L
1 1007
J. H. JOHNSON & Co.,
47, Lincoln's Inn Fields, W.C.,
Agents.

page_text: COMPLETE SPECIFICATION.
Improvements in the Manufacture of Yeast.
I, ARCHIBALD WALKER, of 4 Muirhead Street in the City of Glasgow, Distiller, do
hereby declare the nature of this Invention and in what manner the same is to be
performed to be particularly described and ascertained in and by the following
statement that is to say :-
According to my Invention I prepare a mixture of malt grist, or of grain
(preferably rye, wheat, buckwheat or barley) and malt grists, and hot water and 1
leave this mixture to saccharify for one or two hours the temperature being preferably
maintained at about 142 degrees Fahrenheit. After slightly cooling I mix with it
Sulphuric Acid, Hydrochloric Acid, or Phosphoric Acid which has previously been
diluted with four or five times its weight of water. The quantity of concentrated
Sulphuric Acid used is preferably from about one half per cent to one per cent of the
weight of the grist being treated. The mixture is allowed to stand for from three to
ten hours during which time the temperature should be kept at above 112° Fahrenheit.
The Acid is then almost completely neutralized which may be effected by any of the
ordinary methods employed for neutralizing Acids in such treatments. I prefer to
use for the purpose either Carbonate of Potash-Commercial Carbonate of Ammonia
or Caustic lime or Carbonate of lime.
I then add water and concentrated spent wash which may be prepared in the
following manner. The spent wash obtained from a prior distillation is clarified
heated (if necessary) for some time under pressure and then concentrated by
evaporation the latter stage of the evaporation being if necessary conducted
in vacuo.
The concentrated spent wash should be added in such quantity that the mixture
is of an acidity equivalent to about one per cent of lactic Acid.
The mixture is then cooled preferably to about 65° Fahrenheit and is put into
fermentation with yeast or with a portion of a previous "yeast inash" which has
been kept over for the purpose-The mixture is allowed to ferment generally for
from 8 to 14 hours-Afterwards this mixture or "yeast mash" is used for inducing
fermentation in a quantity of wort preferably at a temperature of about 77° Fahrenheit.
A strong production of yeast takes place and after a time the yeast is collected and
prepared for the market."
After the removal of the yeast the fermented wort may be distilled in order to
obtain therefrom the Alcohol which it contains.
The temperatures times and quantities of Acid berein before given it will be
understood may somewhat vary with the season of the year and the quantity of
material employed.

page_text: Having now particularly described and ascertained the nature of my said
Invention and in what manner the same is to be performed I declare that what
I claim is
First. In or for the manufacture of yeast the preparation of a yeast mash by
mashing malt or malt and grain treating the saccharified mixture with mineral Acid
as aforesaid and neutralizing the Acid and adding concentrated spent wash and
fermenting substantially as herein before described.
Second. The manufacture of yeast by preparing a yeast mash as hereinbefore
described and claimed and adding it to a quantity of wort substantially as hereinbefore
described.
Dated th 101L
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