duction of Oxygen and Nitrogen Gases from Atmospheric Air.
Year: 1888

page_text: Date of Application, 7th Feb., 1888
Complete Specification Left, 12th Oct., 1888
Complete Specification Accepted, 16th Nov., 1888
duction of Oxygen and Nitrogen Gases from Atmospheric Air.
We EDWARD BAUDOUIN ELLIOE-CLARK of Connaught Mansions Victoria Street
in the City of Westminster Civil Engineer and LEONARD CHAPMAN of Connaught
Mansions aforesaid Civil Engineer do hereby declare the nature of this Invention to
be as follows:—
This Invention relates to a process of obtaining oxygen and nitrogen gases from
atmospheric air by means such as are described in the Specification of Letters Patent
granted to Messrs. Brin No. 157 of 1885 and the object of this Invention is to effect
the separation of moisture from the air (previous to its being admitted to the retorts
containing the anhydrous oxide of baryta) in a more efficient and economical manner
than hitherto dispensing with the large quantity of chemical materials which has
hitherto been used for the purpose. According to this Invention I first compress the
air to be admitted into the retorts and then whilst in a compressed state I cool it by
means of a surface cooler cooled by cold air or water so that moisture is deposited.
I then allow the air to expand and to do work in expanding and any undeposited
moisture which has taken the form of snow is deposited and then the dry air is heated
to the required degree and passed into the retorts. This boating may be effected in
any suitable way such as by the waste products from the furnaces or by causing the
cold air to pass around or in proximity to a furnace to be cooled down so that the air
whilst being itself heated exerts a cooling effect on the furnace.
A convenient arrangement is to provide a compressing cylinder tandem with a
steam cylinder there being air outlets from the compressing cylinder to a cooler
containing a number of tubes like a condenser with means for draining and drawing
off moisture and from this a passage for air leads into an expansion cylinder tandem
with a pump which pumps the dry air into the retorts. There may be a chamber
between the expansion cylinder and pump in which snow deposits.
The pumping cylinders may when not in use for compressing the air be employed
as vacuum pumps for withdrawing the oxygen from the baryta.
J. H. JOHNSON & Co.,
47, Lincoln's Inn Fields, London, W.C.,
Agents.

page_text: Improvements in and Apparatus for or Connected with the Pro-
duction of Oxygen and Nitrogen Gases from Atmospheric Air.
We, EDWARD BAUDOUIN ELLICE-CLARK of Connaught Mansions Victoria Street
in the City of Westminster Civil Engineer and LEONARD CHAPMAN of Connaught
Mansions aforesaid, Civil 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 :-
This Invention relates to a process of obtaining oxygen and nitrogen gases from
atmospheric air by means such as are described in the Specification of Letters Patent
granted to Messrs. Brin No. 157 of 1885 and the object of this Invention is to effect
the separation of moisture from the air (previous to its being admitted to the retorts
containing the anhydrous oxide of baryta) in a more efficient and economical manner
than hitherto dispensing with the large quantity of chemical material which has
hitherto been used for the purpose. According to this Invention we first compress
the air to be admitted into the retorts and then whilst in a compressed state we cool
it by means of a surface cooler cooled by cold air or water so that moisture is
deposited we then allow the air to expand and to do work in expanding and any
undeposited moisture which has taken the form of snow is deposited and then the dry
air is heated to the required degree and passed into the retorts.
The accompanying Drawing shows in plan a convenient arrangement according to
this Invention.
The air to be supplied to the Barium oxide is admitted by the inlet a to the
cylinder A wherein it is compressed by means of the engine B connected with the
crank shaft C and then whilst the said air is in a compressed state it is cooled by being
passed from the outlets a² ² from the cylinder A by the pipe D to and through
pipes E in a surface cooler so that moisture is deposited in those pipes and can be
drawn off by the drain pipes and cock F. The surface cooler is cooled by air or
water or by both as shewn in the Drawing where G is the water portion of the cooler
having a baffle plate g and a circulating water inlet and outlet at g² and g³ respec-
tively and H is the air chamber having a baffle plate h and a cooling air inlet and
outlet at and respectively. After the air has passed from the cylinder A and
through the pipes E in the cooler it travels by the pipe into the cylinder J and does
work therein during expansion by assisting in driving the dry air pump K for forcing
the air under pressure by the pipe L into the retorts. The cold dry air is
caused to enter the air chamber H by the pipe 2 and leave it at ³ for the cylinder K,
having circulated around the pipos E and cooled their contents.
The heating of the air before it is passed into the retorts may be effected in any
suitable way such as by the waste products from the furnaces or by causing the cold
air to pass around or in proximity to a furnace to be cooled down so that the air whilst
being itself heated exerts a cooling effect on the furnace.

page_text: The pumping cylinders may when not in use for compressing the air be employed as
vacuum pumps for withdrawing the oxygen from the baryta.
Having now particularly described and ascertained the nature of our said Inven-
tion and in what manner the same is to be performed we declare that what we
claim is :-
1. In combination with apparatus for obtaining oxygen and nitrogen gases from
atmospheric air means for compressing cooling and re-expanding the air intended for
per-oxidizing the barium oxide contained in the retorts the said means being for
the purpose of separating moisture from the air substantially as hereinbefore
described.
2.- In combination with apparatus for obtaining oxygen and nitrogen gases from
atmospheric air means for compressing cooling and reexpanding the air arranged and
combined as herein before described and illustrated in the accompanying drawing.
Dated this 12th day of October 188ð.
J. H. JOHNSON & Co.,
Agents.
J. H. JOHNSON & Co.,
Agents.