A New or Improved Process for the Purification of Carbonic Acid Gas Passing from Lime Kilns and Designed for Liquefaction.
Year: 1896

page_text: Date of Application, 18th Feb., 1896
Complete Specification Left, 17th Dec., 1896-Accepted, 30th Jan., 1897
A New or Improved Process for the Purification of Carbonic Acid
Gas Passing from Lime Kilns and Designed for Liquefaction.
1 ADOLPHE DENIS DELSEMME of 32 Avenue Rogier Liège in the Kingdom of
Belgium, Engineer do hereby declare the nature of this invention to be as
follows:-
My invention consists in a process for purification of the carbonic acid gas passing
from lime kilus by which process elimination of the foreign matters which
accompany the said gas as it leaves the kilns is effected so as to give it the purity
desired for liquefaction.
This end I attain without making any change in the methods of operating at
present practised by lime burners and I may continue the use of close burning
coal which is less expensive than coke. The carbonic acid gas obtained is therefore
highly charged with carbonic oxide and sulphide and bitumen and phosphorous
and even organic matters capable of imparting an offensive flavour to the acid the
removal of all of which matters is the object of my process.
According to my said invention the gases produced by the combustion are on
their exit from the lime kiln pumped into a conduit and passed into absorption
chambers or reservoirs containing potassium lye for which the carbonic acid gas
alone has a great affinity and with which it combines. The other gases produced
by the combustion are then drawn out of the apparatus. After being sufficiently
saturated with the acid the solution is passed into heating apparatus in which the
liberation of the carbonic acid gas takes place. This absolutely pure gas is then
mixed with steam and passed through a refrigerating apparatus into a gasometer.
To liquefy the gas it is freed from moisture by being brought into contact with
a dessicating agent such as chloride of calcium and passed into the compressor.
Dated this Eighteenth day of February 1896.
W. T. WHITEMAN,
Agent for the Applicant.
A New or Improved Process for the Purification of Carbonic Acid
Gas Passing from Lime Kilns and Designed for Liquefaction.
I ADOLPHE DENIS DELSEMME of 32 Avenue Rogier, Liège in the Kingdom
of Belgium 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 :-
My invention consists in a process for purification of the carbonic acid gas
passing from lime kilns by which process elimination of the foreign matters which
accompany the said gas as it leaves the kilos is effected so as to give it the purity
desired for liquefaction.

page_text: This end I attain without making any change in the methods of operating at
present practised by lime burners and I may continue the use of close burning coal
which is less expensive than coke. The carbonic acid gas obtained is (especially
when close burning coal is used) highly charged with carbonic oxide and sulphide
and bitumen and phosphorus and even organic matter capable of imparting an
offensive flavour to the acid the removal of all of which matters is the object of
my process.
According to my said invention the gases produced by the combustion are on
their exit from the lime kiln pumped into a conduit and passed downward through
a washing tower or washing towers consisting of hollow columns as lofty as
possible to the tops of which water is conveyed by suitable pumps and in which
masses of the water so conveyed descend intermittently and in rapid succession.
The gases thus washed in the said towers are then passed into close receivers
constituting absorption chambers or reservoirs and containing potash lye for which
the carbonic acid gas alone has a great affinity and with which it combines. The
other gases produced by the combustion are then drawn out of the said reservoirs.
After being sufficiently saturated with the acid the solution is passed into a boiler
or heating apparatus in which liberation of the carbonic acid gas takes place.
This gas which is absolutely pure but charged with moisture is then passed through
a refrigerating apparatus into a gasometer.
To liquefy the gas it is freed from moisture by being brought into contact with
a desiccating agent such as chloride of calcium and is then passed into a compressor
which effects the liquefaction.
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 I
claim :-
First. A process for the purification of carbonic acid gas passing from lime
kilns and designed for liquefaction consisting in subjecting the said gas as it comes
from the kilns in association with foreign matters to washing with water and
afterward bringing the same into contact with a solution of potash which absorbs
only the carbonic acid and finally passing the said solution saturated with carbonic
acid into a heater in order to set free the carbonic acid which then requires only
to be freed from moisture to render it fit to be liquefied.
Secondly. A process of washing carbonic acid gas coming from lime kilos
consisting in passing it downwards through a hollow column from the top of which
masses of water are caused to fall intermittently and in rapid succession.
Thirdly. A process of desiccation of pure carbonic acid gas liberated by
heating from combination with a solution of potash consisting in bringing it into
contact with chloride of calcium which absorbs the moisture..
D
W. T. WHITEMAN,
Agent for the Applicant.