Purification of Gases. Page: 2 of 6
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UNITED STATESPATENT OFFICE.
ELION L. HALL, OF PORTLAND, OREGON, ASSIGNOR TO ECURITY SAVINGS AND
TRUST COMPANY, OF PORTLAND, OREGON. A CORPORATION OF OREGON.
PURIFICATION 6b' GA$ES.Specification of Lettets atent.
tented flec.8e, 19i14.
Application iled April 4, 1913. S'ela:1 No. 75S,870.
To all whom it may concern:.-.
Be it known that I, ELMON L. HALL, a
citizen of the United States, residing at
Portland, in the county of Multnomah and
5 State of Oregon, have invented certain new
and useful Improvements in Purification of
Gases, of which the following is a specifica-
tion.
This invention relates to purification of
10 gases; and it relates more particularly to the
purification of gases from sulfur contained
therein in various forms; and it comprises a
process of purifying gases, more especially
combustible gases, wherein the gas is caused
15 to travel through a high tension electric dis-
charge to convert contained impurities, es-
pecially sulfur compounds, into more easily
removable forms, and such altered impuri-
ties are thereafter removed from the gas by
20 suitable purifying means; and it comprises
apparatus suitable for carrying out the said
process; all as more fully hereinafter set
forth and as. claimed.
In the purification of gases, particularly
25 of gases to be employed for heating and
illuminating purposes, it is difficult to effect
complete removal of sulfur compounds
which are practically always present in
greater or less proportions in the crude gas.
30 Sulfur may exist in such gases in various
forms, such as hydrogen sulfid, carbon bi-
snlfid,. and, in many cases, as more or less
complex organic compounds of sulfur. The
particular ni.ture .of such sulfur compounds
35 in any given instance depends largely on
the .raw materials from which the gas is
made,-coal, coke, oil etc., and upon the
method of gas manufacture. In any case,
where the gas is to be used for illuminating
40 purposes or as a high grade fuel, it is essen-
tial that sulfur compounds be eliminated
from it as far -as possible, since upon com-
bustion, such compounds yield products such
as sulfur dioxid, for example, which are
45 poisonous, and which, especially in the pres-
ence of moisture, form active corroding
agents._
The usual method .of removing sulfur
compounds from1 gas comprises employment
50 of purifiers or absorbers in which the active
purifying agent is iron oxid in a hydrated
form. The gases carrying sulfur com-
pounds are passed through layers of sha'v-
ings or chips on which the -hydrated ironoxid is deposited, and the hydrogen sulfid in 55.
the gas is taken up by the oxid. In this way
the gas may be very largely freed from
hydrogen sulfid. Other compounds of sul-
fur, and particularly organic compounds
which may be conveniently designated as 60
being of the carbon bisulfid type, are not
absorbed however by the iron oxid purify-
ing materials. Some removal 6f these or-
ganic compounds is effected by the use of
lime; but even with the greatest precaution 65
and under the most favorable circumstances,
it is practically impossible to free gases
entirely from such complex constituents.
This is especially the case with gases made
from California and Texas petroleums 70
whose sulfur content is excessively high.
Crude gas made from such oils contains hy-
drogen sulfid which, as before stated, is
comparatively easy to remove; but it also
contains relatively large quantities of car- 75
bon bisulfid or other more or less complex
organic sulfur coinpomnds from which it has
been heretofore impossible in practice to
free the gas to the described extent without
employing expensive and time consuming 80
operations.
I have discovered that if gas containing
difficultly removable sulfur compounds be
subjected to the .influence of a high poten-
tial electric discharge in connection with 85
suitable dielectrics, the sulfur compounds
are thereby converted into hydrogen.<sulfid
and other compounds of sulfur which can
be removed from the gas by any of the usual
processes employed for the removal of hy- 90
drogen sulfid. The type of electric dis-
charge employed is .advantageously that
known as the silent discharge. The gas to
be treated with the electric discharge may
have received a preliminary purifying 95
treatment for the removal of hydrogen sul-
fid and other easily remhovable sulfur com
pounds; and as a rule this p-eliminary puri-
fication .is best employed. The presence of
hydrogen sulfid much retards the formation 100
of further quantities of hydrogen sulfid by
breaking down organic sulfur compounds;
i. e., it exercises a specific protective influ-
ence on such oganic sulfur compounds.
Where a preliminary purification is em- 105
ployed the conversion of the residual sulfur
compounds in the gas into hydrogen sulfid
is found to be more efficient. I may how-1,120,475.
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Hall, Elmon L. Purification of Gases., patent, December 8, 1914; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth859544/m1/2/: accessed July 18, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.