Improvements in the Extraction of Carbonic Acid from Mineral Carbonates, and in Apparatus therefor.
Year: 1893

page_text: Date of Application, 1st Feb., 1893
Complete Specification Left, 1st Nov., 1893-Accepted, 2nd Dec., 1898
PROVISIONAL SPECIFICATION.
Improvements in the Extraction of Carbonic Acid from Mineral
Carbonates, and in Apparatus therefor.
I, ADRIAN VAN BERKEL, of No. 35-36 Teltower Strasse Berlin in the Empire
of Germany, Civil Engineer, do hereby declare the nature of this invention to be
as follows:-
This invention relates to improvements in the extraction of carbonic acid from
mineral carbonates such as magnesian limestone and the like and in apparatus
therefor, the object being to provide for a speedy removal of the carbonic acid from
above the heated minerals as the said gas is developed, and thus to avoid the
difficulty experienced in the methods as heretofore practised and in the heating
apparatus heretofore employed by reason of the gas collecting above the heated
minerals and thereby impeding or retarding the further development of carbonio
acid gas from the minerals.
To this end I bring the mineral carbonates in contact with the intensely hented
inner sides of a heating device and allow them at intervals to drop down through
a heated space therein, so as thereby to induce them to more readily yield up their
carbonic acid gas, and I at the same time draw off the carbonic acid by means of
a pump or othor suitable device.
For carrying out the above method I preferably employ a hollow drum adapted
to receive the mineral carbonates, the said drum boing exposed to the direct action
of a fire and so mounted as to be slowly rotated. For the purposes of my invention
the inner surface of the casing of the said drum must be arranged so that, upon the
drum being rotated, the minerals therein will be carried upward to a certain height
and then be dropped down through the intensely heated inner space of the drum,
thereby at intervals coming into contact with the glowing inner sides of the drum
aud yielding their carbonic acid gas which is thus continually kept in motion. One
of the journals of the drum may be hollow and connected with a suction pump
which will draw. off the carbonic acid as it is developed within the drum.
perforated plate or siove is preferably extended across the interior of the hollow
journal so as to prevent any solid materials from being carried off with the gas.
Dated this 1st day of February 1893.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in the Extraction of Carbonio Aold from Mineral
Carbonates, and in Apparatus therefor.
I, ADRIAN VAN BERKEL, of No. 35-86 Toltower Strasse Berlin in the Empire
of Germany, Civil 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 improvements in the oxtraction of carbonic acid from
mineral carbonates such as magnesian_limestone and the like and in apparatus
therefor, the object being to provide for a speedy removal of the carbonic acid
from above the heated minerals as the said gas is developed, and thus to avoid the
difficulty experienced in the methods as heretofore practised and in the heating

page_text: apparatus heretofore employed by reason of the gas collecting above the heated
minerals and thereby impeding or retarding the further development of carbonic
acid gas from the minerals.
To this end, I bring the mineral carbonates in contact with the intensely heated
inner sides of a heating device and allow them at intervals to drop down through
a heated space therein, so as thereby to induce them to more readily yield up their
carbonic acid gas, and I at the same time draw off the carbonic acid by means of
a pump or other suitable devico.
For carrying out the above method I preferably employ a hollow drum adapted
to receive the mineral carbonates, the said drum being exposed to the direct action
of a fire and so mounted as to be slowly rotated. For the purposes of iny inven-
tion the inner surface of the casing of the said drum must be arranged so that, upon
the drum being rotated, the minerals therein will be carried upwards to a certain
height and then be dropped down through the intensely heated inner space of
the drum, thereby coming into contact at intervals with the glowing inner sides of
the drum and freely yielding carbonio acid gas. One of the journals.of the drum
may be lollow and connected with a suction pump which will draw off the carbonio
acid as it is developed within the drum. A perforated plate or sieve is preferably
extended across the interior of the hollow journal so as to provent any solid
materials from being carried off with the gas.
In the accompanying drawing,
Figure 1 is a sectional olevation shewing apparatus for heating the minerals,
constructed in accordance with my invention.
Figure 2 is a section on the line, x, Figure 1.
A, A are the walls of the furnace and A' in the grato. B is the drum in which
the minerals are contained. The said drum is mounted in suitable bearings C in
which it can be rotated by gearing D.
The sides of the drum are corrugated or provided with deep hollows as shown
at B' so that the minerals contained therein are carried round when the drum is
rotated in the direction of the arrow, and, after being raised to a certain height
fall through the heated space within the drum, as shown for example at E. The
minerals thereby come in contact with the sides of the drum and with the heated
air or gas therein and the carbonic acid gas which they contain is very quickly
liberated. The journal B' of the drum is hollow and connected with the suction
pipe of a pump by menus of which the carbonic acid gas is withdrawn from the
drum as rapidly as it is produced. I provide a sieve or grating B at the end of
the hollow journal to provent solid pieces of the minerals from being carried off
with the gas. A suitable manhole F is provided at the end of the drum through
which the drum can be charged with minerals and the waste product withdrawn.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1. The method of extracting carbonic acid gas from mineral carbonates consisting
in bringing said carbonates in contact with the heated inner sides or surfaces of a
heating device, raising them within the latter at intervals and then allowing them
to drop through the heated space in said heating device, and drawing off from the
said heated space the carbonic acid gas yielded by the carbonates so treated,
substantially as specified.
3
2. For carrying said method into effect, apparatus consisting of a rotary drum
for receiving the carbonates, said drum being arranged to rotate slowly while
exposed to the direct action of a fire, and so constructed as to raise the carbonates
as it rotates and then to allow them to fall through the heated space within the
said drum, substantially as described, for the purpose specified.
3. The combination with the apparatus set forth in the second claiming clause
of the hollow shaft supporting the drum, said shaft being connected with suitable

page_text: means for drawing off from the interior of the said drum the carbonic acid gas
therein generated, substantially as specified.
4. The apparatus constructed substantially as described with reference to the
accompanying drawings, and operating as, and for the purposes, specified.
Dated this 1st day of November 1893.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.