'Improvements in the Manufacture of Yeast.
Year: 1886

page_text: Date of Application, '17th 'June, *1886.
Complete Left, 17th Mar., 1887.
Complete Accepted, 19th Apr., 1887.
PROVISIONAL SPECIFICATION.
'Improvements in the Manufacture of Yeast.
I WILLIAM STEVENS SQUIRE of Clarendon House: St. John's Wood Park, London
N.Win the County of Middlesex, chemical engineer, do: hereby declare the nature of
this invention to be as; follows::-
"This invention relates to much of the processes for the manufacture of yeast
described in my specifications No. 12058, 1885; No. 12463, 1885; and No. 5457
1886 as consists in adding spent wash (resulting from a previous operation) to the
worts, after they have been separated from the solid matter of the materials from
which they have been prepared. Instead of adding 'the spent wash. directly, to the
worts after straining, the present invention consists in first draining off the worts from
solid matters and afterwards sparging the solid matters with the spent wash. The
spent washssparge thus obtained is then added to the strong worts. In this way, the
strong worts are more effectually washed out a separated from the solid matters. The
Yeast is then grown in the mixture of spent wash and worts, thus obtained, in the
manner described in the above mentioned specifications.

page_text: I WILLIAM STEVENS SQUIRE of Clarendon House, St. Johns Wood Park, London
N.W., chemical engineer 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 :-
This invention relates to so much of the processes for the manufacture of Yeast
described in my specifications numbered 12058, 1885; 12463, 1885; and 5457 1886,
as consists in adding spent wash (resulting from a previous operation) to the worts
after they have been separated from the solid matter of the materials from which they
have been prepared.
Instead of adding the spent wash directly to the worts after separation from the
solid matter, the present invention consists in first draining off the worts from the solid
matters, and afterwards sparging the solid matters with the spent wash. The spent
wash sparge, thus obtained, is then added to the strong worts which have been
previously drained off. In this way the strong worts are more effectually washed out
and separated from the solid niatters.
Yeast is then added to the mixture of spent wash and worts thus obtained in the
manner, and under the conditions of acidity and temperature described in the above
mentioned specifications, and fermentation allowed to proceed, and when a head of
yeast rises to the surface, it is collected, washed, and pressed.
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 ;—
The herein described process for sparging with spent wash the residual solid matters
(draff) of malt, or malt and grain mashes after removal of the strong worts, and adding
the sparge so obtained to the strong worts in order to produce a solution suitable for
the growth of yeast substantially as herein set forth.
Dated this Seventeenth day of March 1887.