An Improved Method and Apparatus for Roasting Coffee and Obtaining Aromatic Products.
Year: 1892

page_text: Date of Application, 3rd Sept., 1892
Complete Specification Left, 2nd June, 1893-Accepted, 8th July, 1893
PROVISIONAL SPECIFICATION.
An Improved Method and Apparatus for Roasting Coffee and
Obtaining Aromatic Products.
I HERBERT JOHN HADDAN of the firm of Herbert & Co. Patent Agents of
18 Buckingham Street Strand W.C. London, Civil Engineer do hereby declare the
nature of this invention a communication from abroad by the firm of Kathreiner's
Malzkaffeefabrik, Wilhelm & Brougier of Mühldorfstrasse 20, Munich in the
Empire of Germany to be as follows:-
The procedure and apparatus hitherto known have the evil that the skins of the
coffee berries are held back in the roasting cylinder and partly pulverized so that a
greyish and unpleasant appearance is given to the coffee and its market value is
materially reduced.
The object of the present invention, is to obviate this fault, to effect a first rate
roasting of the coffee and at the same time to recover the aromatic products of the
roasting.
For the attainment of this object it is above all things necessary that care should
be taken that together with the vapours and gases the injurious particles of coffee
husk, cuticle and dust falling away during roasting should be removed as quickly as
possible. This is effected by producing a suction of the roasting gaseous products
by means of a ventilator. Hot air must at the same time be introduced by the
suction.
The gaseous products and the husks &c. are then carried to an apparatus, in
which by a suitable arrangement, the latter are kept back and the gases
condensed.
The
The hot air withdrawn is replaced by the hollow shaft of the roasting drum being
connected with pipes lying in the furnace or fireplace which heats the drum.
draw off pipe of the drum or roaster as well as also the draw off shaft is as broad
as possible so that the falling out of beans is prevented, the cuticles on the other
hand can be easily blown away or carried off by suction.
The gaseous products pass down through a pipe which can be passed into and
drawn out of the roaster shaft, for example, by means of a lever, and, by means of
a movable metal pipe are carried to a cooling apparatus.
A pipe leads froin this cooler to the ventilator which effects the suction into the
cooler and so carries off the uncondensed gases therefrom. The cooling apparatus
consists of a chamber formed of parallel welded sheet metal plates, this chamber
opening into a common condensation chamber. The cooler must be so made that
the accompanying cuticles or husks may be as far as possible held back either by
the side plates or by shelves or crosswalls in the chamber.
Whilst in this manner the cuticles are kept back, the gaseous products are at the
same time condensed on the cooled walls.
The condensation chamber is in two parts, connected with each other by hinge
joints or the like and provided with suitable closing arrangements.
The condensation chamber is divided by a wire netting or sieve, the object of
which is to hold back the cuticles upon the falling of the condensed liquid, whilst
the condensed liquid runs into the underneath part provided with a slanting bottom
from which it is drawn off through a cock.
The cuticles which are carried downwards with the other products, collect in the
condensation chamber on the wire netting and are removed from time to time, for
which purpose the separate parts of the cooler are detached. Care must thereforc
be taken that the cooler can be easily taken out of the water tank which effects the
cooling and which is supplied with cold water.

page_text: The condensation liquid contained in the under part of the cooling chamber, is a
brown, slightly tarry, coffee smelling liquid of sour and bitter taste; it is purified
by neutralization with bi-carbonate of soda or carbonate of lime and distilled in a
current of steam.
The distillation product is free from acetic acid and smells intensely of coffee.
Dissolved in water it is capable of useful application, such for instance as the
impregnation of malt for forming what is termed "malt coffee."
The procedure and apparatus described facilitates an extraordinarily good roasting
of the coffee to which by the removal of the skin particles a very fine appearance is
imparted, and they effect the most advantageous recovery of useful materials from
the gaseous products of roasting.
Dated this 3rd day of September 1892.
HERBERT & Co.,
Agents to Applicant.
COMPLETE SPECIFICATION.
An Improved Method and Apparatus for Roasting Coffee and
Obtaining Aromatic Products.
I HERBERT JOHN HADDAN of the firm of Herbert & Co. of 18 Buckingham
Street Strand W.C. London, Consulting Engineer do hereby declare the nature of
this invention a communication to me from abroad by Kathreiner's Malzkaffee
Fabrik, Wilhelm & Brougier of Munich in the Empire of Germany and in what
manner the same is to be performed to be particularly described and ascertained in
and by the following statement:—
The procedure and apparatus hitherto known have the evil that the skins of the
coffee berries are held back in the roasting cylinder and partly pulverized so that a
greyish and unpleasant appearance is given to the coffee and its market value is
materially reduced.
The object of the present invention is to obviate this fault, to effect a first rate
roasting of the coffee and at the same time to recover the aromatic products of the
roasting.
For the attainment of this object it is above all things necessary that care should
be taken that together with the vapours and gases, the injurious particles of coffee
husks, cuticles, and dust falling away during roasting should be removed as quickly
as possible. This is effected by producing a suction of the roasting gaseous
products by means of a ventilator. Hot air must be at the same time introduced
by the suction.
The gaseous products and the husks etc. are then carried to an apparatus in
which by a suitable arrangement the latter are kept back and the gases condensed.
The hot air withdrawn is replaced through the hollow shaft of the roasting drum
which for this purpose is connected with pipes lying in the furnace or fireplace
which heats the drum.
In the annexed sheet of drawings
Fig. 1 shows a section through the roasting cylinder.
Fig. 2 shows the condensing apparatus to which the gaseous products are
conducted. Figs. 2 and 3 being vertical sections of this condensing apparatus.
The connection with the coiled pipe lying in the fireplace is effected by the
bent pipe which is easily removable and replaceable. The diameter of the draw
off pipe of the drum or roaster as well as also the draw off shaft therein is as large
as possible so that while the falling out of the beans is prevented the cuticles on the
other hand can be easily blown away or carried off by suction.
The gaseous products pass down through the pipe L (Figs. 1 and 2) which can
be passed into and drawn out of the roaster shaft for example by means of a lever,
and by means of a movable metal pipe are carried to the condensing apparatus
shown in Figs. 2 and 3.

page_text: A piper leads from this condenser to the ventilator which effects the suction
into the condenser and so carries off the uncondensed gases therefrom.
The cooling or condensing apparatus consists of a chamber or tank W formed of
parallel welded sheet metal plates, this chamber opening into a common condensation
chamber x. The cooler must be so made that the accompanying cuticles or husks
may be as far as possible held back either by the corrugation of the side plates of
the chamber W or by shelves or cross walls inserted in the chamber.
Thus in Fig. 1 on the right the walls are shown as corrugated while on the left
a similar condensing effect is produced by the insertion of the cross walls
alternately arranged, and perforated if desired, which also hold back the husks.
Whilst in this manner the cuticles are held back, the gaseous products are at the
same time condensed on the cooled walls.
The condensation chamber is in two parts connected with other by hinge joints
or the like and provided with suitable closing arrangements.
The top coolers w are likewise in two parts detachable from each other.
The condensation chamber is divided by a wire netting or sieves the object
of which is to hold back the cuticles upon the falling of the condensed liquid,
whilst the condensed liquid runs into the underneath part provided with a
slanting bottom from which it is drawn off through cock h.
The cuticles which are carried downwards with the other products collect in
the condensation chamber on the wire netting and are removed from time to
time for which purpose the separate parts of the cooler are detached. Care
must therefore be taken that the cooler can be easily taken out of the water
tank Z which effects the cooling and which is supplied with cold water.
condensed liquid found in the under part of the cooling chamber is a brown,
slightly tarry, coffee smelling liquid, of sour and bitter taste; it is purified by
neutralization with bicarbonate of soda or carbonate of lime and distilled in a
current of steam.
The
The distillation product is free from acetic acid and smells intensely of coffee.
Dissolved in water it is capable of useful application, such for instance as the
impregnation of malt for what is termed "malt coffee."
The procedure and apparatus described facilitate an extraordinary good roasting
of the coffee to which by the removal of the skin particles a very fine appear-
ance is imparted, and they effect the most advantageous recovery of the useful
materials from the gaseous products of roasting.
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. The method of roasting coffee and at the same time obtaining the aromatic
products of roasting, consisting in drawing off the gaseous products of the roasting,
particles of coffee husk; and dust by suction from the roasting cylinder previously
fed with heated air and carrying same to a cooling apparatus in which the particles
of husk and the like are kept back by cross walls, corrugated plates, sieves or the
like so that they are separated from the condensed liquid collecting in the lower
part of the cooling apparatus.
2. In apparatus for the purpose set forth, a condensing apparatus having hollow
walls w formed of detachable plates corrugated or provided with shelves q, and in
combination therewith a cooling vessel a separated into two parts by sieve or wire
nettings and likewise with detachable parts for the purpose of removing the
particles of husk and the like separated from the condensed liquid substantially as
set forth.
1
3
1 .
T
1000
HERBERT & Co.,
Agents for Applicant.