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Патент USA US2406003

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Aug. 20, 1946.
Y
A
w. DENNIS
~
~¿406,003
METHOD AND APPARATUS FOR OBTAINING PURIFIÈD LIQUID OXYGEN
Filed oct. 1, 1943
y
~
ATTORNEYS
v
Patented Aug. 20, 1946
2,406,003
w
UNITED STATES PATENT oFFlcE
METHGD AND APPARATUS FOR OBTAINING
PURIFIED LIQUID OXYGEN v
Wolcott Dennis,
Darien, Conn., assigner
Air
Reduction Company, Incorporated, New toYork,
vN. Y., a corporation of New York
Application October 1, 1943, Serial No. 504,578
’
5 claims.
(ci. fsa-115.5)
This invention relates to the separation and re
covery of pure liquid oxygen from atmospheric air
by liquefaction and rectification,
eliminated eñ’ectively.
In the usual methods of separating oxygen from
caps 8, eñ’ecting partial rectiñcation of the liquid
air introduced through the pipe I6.
A condenser section ii having a plurality of
tubes I8 is provided in the column 5, and the va
suitable for many uses.
It is the object of' the present invention to pro
vide a method and app
which aii'ord a high
yield of liquid >oxygen aratus
free from
impurities such
as those mentioned.
_ .another object of
25
formed in_the condenser tubes. l 9 is comparatively
rich in nitrogen, since most of the oxygen has
30 been separated on the trays i in the form of liquid
which
accumulates
in the vaporizer section i3.
Th
`
L panying drawing, illustrating
an apparatus suit- '
able for the practice of the invention.
In carrying
out the invention, the air is ini
35
the separation-of the desired constituents. _
eiiiuent or waste gas escapes through a pipe 28
from the top of the column.Surrounding the condenser tubes I9 is a va
45 porizer
section 2
'
is‘anexample
auxiliary column> operatlng at low pressure,
for
a little above
.column 5 is provided with
is liquid contains the impurities
hereinbefore mentioned. To remove the impuri
50 ties, the liquid is conveyed through a pipe 30 into
the condenser section I1. oi' the column’5 where
it surrounds the tubes I8. 'I'he liquid in the va
porizer 29 is under relatively low pressure, but
the liquid in the condenser section I1 is under a
static head of the column of liquid in the pipe 30
55 and vaporizer section 29. 'I'he liquid is vaporized
2,406,008
section I1, affording oxygen in
in
condenser
thethe
vapor
phase, free from impurities. The latter
section il'. The vapor
remain in the iscondenser
conveyed through a pipe 3l to
~ 4
the static head o! th'e first body. vaporizing the
liquid oxygen of the second body by heat ex
change with vapors produced by the rectification
and reliquefying the oxygen vapor by heat ex
' a coil 32 submerged in the liquid surrounding the
change with the ñrst body ot liquid oxygen.
2. The method of recovering liquid oxygen tree
tubes I9, and since this vapor is under the static
from impurities by separation from atmospheric
head provided as hereinbefore described,
air which comprises separating nitrogen from the
oxygen of the air by liquefaction and rectifica
tion, thereby producing a first body of liquid oxy
phase oxygen
`
readily lìqueñed by heat exchange with the liquid
in the vaporizer 29. The liquid oxygen product; is
withdrawn from the coil 32 through a pipe 33
controlled by a valve 34 and is delivered to any
suitable storage receptacle.
-
gen at a pressure slightly exceeding one atmos
phere, delivering
from the ñrst body
to a second body
lower level under
the static head of the first body, vaporizing the
nected to the condenser section l1 to permit with 15 liquid oxygen of the second body by heat ex
drawal from time to time of liquid containing
change with vapors produced by the rectification
and reliquefying the oxygen vapor by heat ex
impurities. Purges 31 and 38, controlled by valves
39 and 4D, similarly permit removal of liquid from
change with the ñrst body of liquid oxygen.
3. In the method of recovering liquid oxygen
the vaporizer sections i3 and 29.
By locating the condenser section l1 in the 20 free from impurities by separation from atmos
pheric air, the steps of maintaining two bodies
high pressure column at a point below the main
of liquid oxygen at different levels, the lower body
oxygen vaporizer 28, it is possible by virtue of
being subject to the static head of the upper body,
the liquid head available, to vaporize the im
vaporizing oxygen from the lower body and re
pure oxygen product at suñ'icient pressure to
cause the evolved vapor to condense in the con 25 liquefying the vaporized oxygen by heat exchange
denser coil 32 by heat exchange with the liquid
with the liquid of the upper body.
4. In an apparatus for recovering liquid oxygen
surrounding the coil at lower pressure. Since all
from atmospheric air, two superposed rectiñers,
feeds to the low pressure column are substan
a vaporizer at the bottom of the upper column,
tially liquid and since the vaporizer is situated
at the lower end of said column, it is possible 30 a vaporizer in the lower column, a connection be
tween the two vaporizers whereby liquid in the
to maintain a maximum of reflux thus ensuring
lower vaporizer is subject to the static head of
a high degree of rectification. The method and
liquid in the upper vaporizer, andv a condenser
apparatus as described afford a more eñicient pro
in the upper vaporizer connected to the lower
cedure and structure permitting the recovery o!
vaporizer to receive and reliquefy the vapor de
oxygen in a liquid form free from impurities and
livered from the lower vaporizer.
substantially without serious losses.
5. In an apparatus for recovering liquid oxygen
Various changes may be made in the details of
from atmospheric air, means for maintaining two
the apparatus and the operation thereof with
out departing from the linvention or sacrificing
bodies of liquid oxygen at diiîerent levels, a con
nection whereby the body at the lower level is
the advantages thereof.
40
maintained under the static head of the liquid
I claim:
A purge 35 controlled by a valve 3B is con
1. The method of recovering liquid oxygen free
from impurities by -separation from atmospheric
air which comprises separating nitrogen from the
oxygen of the air by liquefaction and rectifica
tion, thereby producing a. ñrst body of liquid oxy
gen, delivering liquid oxygen from the first body
to a second body of liquid at a lower level under
at the higher level, a condenser within the body
at the higher level and means for delivering va
por from the body at the lower level to the con
45 ' denser.
WOLCOTT DENNIS.
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