A Process and Apparatus for Infusion and Extraction of Hops.
Year: 1895

page_text: Date of Application, 28th Apr., 1895-Accepted, 1st June, 1895
COMPLETE SPECIFICATION.
A Process and Apparatus for Infusion and Extraction of Hops.
I, EMIL HEINEMANN, of 24 Ackerstrasse, Dortmund, Prussia, Brewer, 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 a process and apparatus for complete infusion of hops
and extraction of their useful ingredients, so arranged and conducted that first the
wort rich in extract and then the poorer wort are made to act in a special manner
on the hops in a boiling or extraction apparatus interposed between the clarifying
tank and the wort pan.
The conduct of this process is such that, after the ordinary boiling and infusion
of the hops with wort rich in extract, a farther and almost complete extraction is
effected in such manner that wort which is poor in extract is introduced from below.
into the extraction apparatus, causing its contents, under continued boiling, to flow
out above.
Fig. 1 of the accompanying drawings shews, by way of illustration, the arrange-
ment of the boiler between the clarifying tank and the wort pan.
Fig. 2 is a section to an enlarged scale of the boiler or extraction apparatus.
The quantity of hops required for a brewing is introduced into the boiler A
through the manhole a; then from the clarifying tank there is sent through the
pipe 6 into the boiler A so much of the wort as will about three quarters fill it.
The manhole is then closed, the agitator is worked and the contents are heated
to boiling by a suitable heating device such as a steam coil or steam jacket, so that
the first extraction is effected, the vapour generated during the operation being
led away by a pipe d to a condenser B. The condensed liquid may be delivered
into the wort pan or is added to the fermenting beer in the cellar.
After completion of the principal extraction process the farther extraction
according to this invention, proceeds as follows:-
Previously prepared poor wort is led by the pipe b into the boiler A; as the
mouth of the pipe b is at the bottom, the poor wort forces up the hopped wort in
the boiler, through the discharge pipe finto the wort pan, the boiling and agitation
still going on during this time. The contents of the boiler become poorer and
poorer in extract, the action being carried on continuously until the liquid in the
boiler contains only from to 2 per cent. of extract.
The aromatic ingredients of the hops are chiefly withdrawn during the principal
extraction operation so that during the farther extraction with poor wort the
vapour may be allowed to escape by the pipe g.
If the last liquid, very poor in extract, in the boiler is to be made use of, the
contents of the boiler A may be run into the hop filter E Fig. 1, and thence either
pumped into the wort pan D to be boiled along with its contents, or they may be
run into the cooling tank or collecting tank (not shewn) into which the contents of
the wort pan D are run after boiling.
The boiler A is provided with all necessary adjuncts, for instance a cleansing
brush which revolves with the agitator so as to keep the sieve at the mouth of
the pipe clear; a thermometer i; at k admission and reducing valves for the
steam for regulation of the heating; an air and safety valve and pressure gauge.;
a pipe for outflow of water of condensation; an arrangement at m of a perforated
cone that can be raised and lowered for the final discharge of the hops; a discharge

page_text: valve n to let the residue of the wort and hops pass into the filter E; a pipe o for
supplying water to and a pipe p for discharging water from the condenser B.
The process described may to a certain extent be varied, by supplying and
discharging the rich and poor wart at various periods, or with periods of inter-
mission, yet the operation is essentially continuous, as the poor wort enters below
and flows out continually above.
The supply of poor wort must be so regulated that the boiling is not interrupted.
The poor wort from the clarifying tank becomes gradually weaker, and the
extraction can be carried on if desired almost to complete extraction or can be
stopped when a certain percentage of extract has been attained.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1. A process for effecting hop extraction by means of a boiler interposed between
the clarifying tank and the wort pan, whereby the hops, after their extraction by
wort rich in extract, are subjected to farther extraction by wort poor in extract,
which enters the boiler from below and forces its contents under continued boiling
through an outlet above into the wort pan, substantially as described.
2. A hop boiling and extraction apparatus for carrying out the process referred to
in the first claim, which, for the purpose of being introduced between the clarifying
tank and the wort pan, is provided with a lower wort supply pipe, with an upper
discharge pipe for the hopped wort and poor wort, as also with a discharge pipe
for the hop extract vapours, substantially as described.
3. In combination with the apparatus referred to in the preceding claim, the
arrangement of a brush revolving with the agitator for cleaning the sieve at the
month of the outlet pipe, substantially as described.
Dated this 26th day of April 1895.
ABEL & IMRAY,
Agents for the Applicant.