A New or Improved Process for Producing Lime and Obtaining Carbonic Acid.
Year: 1898

page_text: Date of Application, 22nd Nov., 1898
PROVISIONAL SPECIFICATION.
A New or Improved Process for Producing Lime and Obtaining
Carbonic Acid.
We, HENRY CLAY BULL, of No. 15, West Square, Lambeth, in the County of
Surrey, Engineer, ALBERT CHARLES OAKES, of No. 4, Rubigny Gardens, Putney,
in the County of Surrey, Merchant, and THOMAS MATHESON THOм, of No. 59,
Lordship Lane, Wood Green, in the County of Middlesex, Lithographer, do
hereby declare the nature of this invention to be as follows:-
This invention relates to a new or improved process for producing lime and
obtaining carbonic acid.
In carrying the invention into effect, an ordinary closed top kiln is employed
of a similar character to that ordinarily used in chemical works for producing
lime and obtaining carbonic acid.
According to the present invention, however, a closed top feeder is employed
by the aid of which the limestone and coke or other carbonaceous material are
introduced into the kiln and air is in great part effectually excluded and a
similar device provided in connection with the door at the lower part of the
kiln, through which the charge is withdrawn for the same purpose.
In lieu of air, oxygen, obtained in any well known cheap way, is introduced
into the interior of the kiln by any suitable means, provided with a valve or
device for regulating the supply.
The combustion of the coke or other carbonaceous material in the presence of
oxygen produces carbonic acid which coming into contact with the incandescent
carbonaceous material is converted into carbonic oxide which together with any
unconverted carbonic acid derived from the carbonaceous material or from the
limestone is withdrawn from the kiln through the closed fire box of a steam
generator by means of a suitable exhauster.
Into this closed fire box is introduced, by any suitable means capable of
regulation, an additional supply of oxygen, the combustion thereby produced con-
verts the carbonic oxide into carbonic acid and this latter is recovered by
drawing it off continuously into a suitable receptacle.
The steam generated by this furnace will supply the motive power required to
drive an engine by the aid of which the carbonic acid may be compressed and
reduced to a liquid state so that it can be stored in steel bottles.
Dated this 22nd day of November 1898.
VAUGHAN & SON,
Agents for the Applicants.

page_text: A New or Improved Process for Producing Lime and Obtaining
Carbonic Acid.
We, HENRY CLAY BULL, of No. 15, West Square, Lambeth, in the County of
Surrey, Engineer, ALBERT CHARLES OAKES, of No. 4, Rubigny Gardens, Putney,
in the County of Surrey, Merchant, and THOMAS MATHESON THOм, of No. 59,
Lordship Lane, Wood Green, in the County of Middlesex, Lithographer, do
hereby declare the nature of this invention, and in what manner the same is
be performed, to be particularly described and ascertained in and by the fol-
lowing statement:-.
Our said invention relates to a new or improved process for producing lime
and obtaining carbonic acid, and has for its object primarily to obtain, in a
more regular and economical manner than heretofore, carbonic acid in large
volume.
In carrying the invention into effect, an ordinary closed top kiln is employed
of a similar character to those ordinarily used in chemical works for producing
lime and obtaining carbonic acid.
According to the present invention, however, the kiln at the top thereof is
provided with a closed feeder, by the aid of which the limestone and coke or
other carbonaceous fuel material are introduced into the kiln, whilst, at the
same time, air is in great part excluded, and, with the same object, a similar
device is employed in connection with the opening at the lower part of the
kiln, through which the solid products of the charge are withdrawn.
In lieu of the usual supply of air to support combustion, a supply of oxygen,
obtained in any well known economical manner, is, by any suitable means,
introduced into the interior of the kiln through a conduit opening into the
kiln at the lower part thereof, and provided with a valve or device, by the aid
of which the supply may be regulated at will.
The combustion of the coke or other carbonaceous material in the presence
of the oxygen introduced in the manner above described, and the calcination of
the limestone, produce carbonic acid, and this, together with the whole of the
products of combustion, is drawn upward through the incandescent fuel material
and limestone by the means hereinafter described, and, coming into contact with
said incandescent carbonaceous fuel, the whole of the carbonic acid, or nearly
so, is converted into carbonic oxide.
The carbonic oxide, together with any unconverted carbonic acid derived from
the carbonaceous fuel material or from the limestone, is, by means of a fau or
other suitable exhausting apparatus, withdrawn from the upper part of the kiln
through a closed chamber, which may with advantage be the fire-box of a steam
generator, into a receptacle hereinafter referred to, and which fire-box is, for
the purpose of this invention, closed against the outer air.
Into this closed chamber or fire-box is introduced, by any suitable means
capable of regulation, an additional supply of oxygen, and the consequent com-
bustion of the carbonic oxide converts the same into carbonic acid, and this
latter is recovered by drawing it off continuously into a suitable receptacle by
the fan or exhausting apparatus.
When the closed chamber is the fire-box of a steam generator, the steam
generated by the combustion of the gases passing through the closed fire-box
will supply the motive power employed to drive an engine, by the aid of which
the fan or exhausting apparatus may be kept in motion, and it may also be
utilised for compressing the carbonic acid, and reducing it to a liquid state for
storage.

page_text: The solid products of the charge, which now consist of lime and refuse fuel,
are, from time to time, withdrawn through the air excluding device at the
lower part of the kiln.
By the process herein before described, carbonic acid may be produced in large
volume in a more regular and economical way than heretofore, whilst the result-
ing lime possesses the ordinary market value.
Having now particularly described and ascertained the nature of our said
invention, and in what manner the same is to be performed, we declare that
what we claim is;-
A process for producing lime and obtaining carbonic acid; consisting in
charging a kiln from which air is largely excluded, with limestone and car-
bonaceous fuel material, supplying oxygen to the kiln at the lower part of the
charge, drawing off the resulting gases and products of combustion from the
upper part of the kiln at a point above the charge, through the incandescent
fuel material and limestone, whereby some or all of the carbonic acid present
is converted into carbonic oxide, drawing the whole of the gases which may
contain carbonic acid through a closed chamber, and supplying oxygen to the
gases on their passage through said chamber, thereby effecting the combustion
of the carbonic oxide and converting the same into carbonic acid, and collecting
said carbonic acid in a suitable receptacle, the lime being available in the manner
stated, substantially as herein described.
Dated this 21st day of September 1890