Desulphurizing the Lime Used in Gas Purifiers and Recovering the Sulphur therefrom.
Year: 1888

page_text: Date of Application, 30th Oct., 1888
Complete Specification Left, 29th July, 1889-Accepted, 5th Oct.. 1889
PROVISIONAL SPECIFICATION.
Desulphurizing the Lime Used in Gas Purifiers and Recovering the
Sulphur therefrom.
1 WILLIAM THOMAS WALKER of Bishopswood Road Highgate in the County of
Middlesex Esquire do hereby declare the nature of this Invention to be as follows:-
The object of my Invention is to desulphurize the line which has been used in
gas purifiers for the purification of coal gas from sulphur or sulphur compounds
so that I not only do away with an at present existing nuisance but I recover the
sulphur and I may also obtain lime which after being revivified is fit to be used
again in the purifiers.
According to my Invention I introduce carbonic acid gas into the lime which has
become charged with sulphur or sulphur compounds the carbonic acid gas displacing
the sulphur which passes into any suitable appliance for receiving or recovering it
for example into a gas holder or direct into a condenser and scrubber and thence
into a Claus Patent Kiln in which the sulphur is obtained and deposited. The
process may be carried on with carbonic acid gas obtained from any convenient
source or sources but generally I prefer to use the carbonic acid gas which is
driven off in revivifying the lime from carbonic acid gas. I may either drive off
the sulphur as described whilst the foul lime is in the purifier or 1 may after it has
been removed therefrom place it in suitable vessels for treatment.
Dated this 30th day of October 1888
J. H. JOHNSON & Co.,
47, Lincoln's Inn Fields, W.C., Agents.
COMPLETE SPECIFICATION.
Desulphurizing the Lime Used in Gas Purifiers and Recovering the
Sulphur therefrom.
I, WILLIAM THOMAS WALKER of Bishopswood Road Highgate in the County of
Middlesex, Esquire 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 :-
The object of my Invention is to desulphurize the lime (which has been used in
gas purifiers for the purification of coal gas) from sulphur or sulphur compounds
so that not only do away with an at present existing nuisance but I recover the
sulphur and I may also obtain lime which after being revivified is fit to be used again
in the purifiers.
66
"
According to my invention I introduce carbonic acid gas into the lime which has
become charged with sulphur or sulphur compounds the carbonic acid gas displacing
the sulphur compounds which pass into any suitable appliance for receiving or
recovering the sulphur for example into a gas holder or direct into a condenser and
scrubber and thence into a Claus Patent Kiln in which the sulphur is obtained
and deposited. The process may be carried on with carbonic acid gas obtained from
any convenient source or sources but generally 1 prefer to use the carbonic acid
gas which is driven off in revivifying the lime from carbonic acid gas I
drive off the sulphur as described whilst the foul lime is in the purifier or I may
may either
after it has been removed therefrom place it in suitable vessels for treatment.
When the desulphurizing of the lime is to be effected whilst the lime is in the
purifiers provide the purifiers with an inlet pipe from the source of supply of
carbonic acid gas and an outlet pipe for the products of desulphurization these pipes
and the ordinary pipes for the inlet and outlet of the coal gas being provided with
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page_text: valves so that when the lime has become foul the coal gas inlet and outlet are
closed and the inlet for carbonic acid gas and the outlet for the products of the
desulphurizing process are opened.
In practice it will be found by experiment the time which the desulphurizing
process will take and consequently the time during which the passing in of carbonic
acid gas is to be continued to effect desulphurizing of the lime or such amount of
desulphurizing as may be necessary.
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. Desulphurizing lime which has been used in coal gas purifiers (for purifying
the said gas from sulphur or sulphur compounds) by passing carbonic acid gas through
the said lime.
2. Desulphurizing lime which has been used in coal gas purifiers (for purifying
the said gas from sulphur or sulphur compounds) by passing therethrough carbonic
acid gas which is driven off in revivifying lime which has been used in purifying coal
gas from carbonic acid gas.
3. Desulphurizing lime which has been used in coal gas purifiers (for purifying
the said gas from sulphur or sulphur compounds) and recovering the sulphur driven
off substantially as hereinbefore described.
Dated this 29th day of July 1889.
WILLIAM T. WALKER.