Improvements in or connected with the Production of Mono- carbonates from Bicarbonates of the Alkalies
Year: 1891

page_text: Date of Application, 18th Sept., 1891
Complete Specification Left. 18th June, 1892-Accepted, 23rd July, 1892
PROVISIONAL SPECIFICATION.
Improvements in or connected with the Production of Mono-
carbonates from Bicarbonates of the Alkalies.
1. FREDERICK HERBERT GOSSAGE, of Widnes, in the County of Lancaster,
Chemical Manufacturer, do hereby declare the nature of this invention to be as
follows:-
The main object of my invention is to effect the production of monocarbonates
from bicarbonates of the alkalies-more particularly of soda and potash-in a more
simple and less costly manner than is commonly practised at present.
Under this invention, I produce monocarbonate from bicarbonate, say, of soda,
by the employment and action or operation thereon of hot gases, or hot air. The
gases which may be used for the purpose, are the waste hot gases discharged from
the flues or furnaces of steam generators, and other apparatus heated by solid,
gaseous, or liquid fuel.
In carrying on the production or manufacture of monocarbonate from bicarbonate
of soda, I place the bicarbonate in a closed vessel in a wet state (or in a dry state),
and pass the hot gas, or air, through it by means of pressure or vacuum.
operation is continued until such time as the bicarbonate is reduced to mono-
carbonate.
This
When hot air is used to effect the end desired, and herein specified, it may, for
cheapness and simplicity, be obtained by passing it through a heat interchanging
apparatus subjected to the hot gases above referred to; or by equivalent means.
Dated this 17th day of September 1891.
CHEESBROUGH & ROYSTON, Fels. Inst. Char. P.A.,
15, Water Street, Liverpool, Applicant's Patent Agents.
COMPLETE SPECIFICATION.
Improvements in or connected with the Production of Mono-
carbonates from Bicarbonates of the Alkalies.
I, FREDERICK HERBERT GOSSAGE, of Widnes, in the County of Lancaster,
Chemical Manufacturer, do hereby declare the nature of this invention and in
what manner the same is to be performed, to be particularly described and ascer-
tained in and by the following statement :-
The main object of my invention is to effect the production of monocarbonates
from bicarbonates of the alkalies-more particularly of soda and potash-in a
more simple and less costly manner or means than is commonly practised at present.
Under this invention, I produce monocarbonates from bicarbonate, say, of soda,
by the employment and action or operation thereon of hot gases, or hot air. The
gases which may be used for the purpose, are the waste hot gases discharged from
the flues or furnaces of steam generators (in which case the heat thereof is trans-
ferred to air or other suitable gas by a heat interchanger as herein mentioned
and the air acts directly on the alkali) lime kilns, and the like, heated by solid,
gaseous, or liquid fuel.
In carrying on the production or manufacture of monocarbonate from bicarbonate
of soda, I place the bicarbonate in a closed vessel or series of vessels in a wet state
(or in a dry state), and pass the hot gas, or air, through it by means of pressure or
vacuum; and this treatment is continued until such time as the bicarbonate is
reduced to monocarbonate. It will of course be understood that the temperature of
DO17

page_text: the gases or air user must be above that necessary to disassociate the carbonic acid
from the bicarbonate.
When hot air is used to effect the end desired, and herein specified, it may, for
cheapness and simplicity, be obtained by passing it through a heat interchanging
apparatus subjected to the hot gases above referred to; or by equivalent means.
In the case in which the carbonic acid gases driven off from the alkali bicarbonate
are subsequently used in process of manufacturing alkalies, the gases which I
may use with advantage, are those coming off from the lime kilns used in such
processes, as in such cases these gases would be enriched, as to the percentage of
carbonic acid they contain, the enrichment of course being due to the carbonic acid
driven off from the bicarbonate of soda, or potash, as the case may be.
I find, so far as the practice of my invention at present shews, that when the
process is carried on in ordinary closed vessels, and the gases passed through a
certain depth of material, say from 2 to 4 feet, the results are obtained by carrying
on the process with only a small difference of pressure between the upper and under
sides of the material. It will be plain, however, that the time necessary to effect
the reduction of the bicarbonate to monocarbonate will depend upon the depth of
the bicarbonate, and the temperature of the gases or air used.
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 :-
The production of monocarbonates from bicarbonates of the alkalies by passing
hot gas or air through the bicarbonates in a closed vessel or series of vessels;
substantially as and for the purposes set forth.
Dated this 18th day of June 1892
CHEESBROUGH & ROYSTON, Fels. Chart. Inst. P.A.,
15, Water Street, Liverpool, Applicant's Patent Agents.