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Патент USA US3076511

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Feb. 5,\ 1963
E. scHlNN
She'ets-Shëef 1 `
'Original Filed Nov.. 8, 1956
Ernsì; Schirm
Feb. 5,* 1963
E. scHlNN
- ,076,501
Original Filed Nov. 8, 1956
2 Sheets-Sheet 2`
Ernsì Schínn
.Att o'r‘n egs
United States Patent Otiîce
Patented Feb. 5, 1953
the lower end of the column 22 into the chamber 9.
Here they enter the lower end of pipe 2 and rise in
the liquid> column 17 which seals the inlet side ofv the
vacuum chamber 1. In column 17, the particles are
moistened and freed from adhering air.
Ernst Schinn, Weingartshof, near Ravensburg, Germany,
The rising particles form a material column 23, at the
assignor to Escher Wyss Aktiengesellschaft, Zurich,
top of the liquid column 17, in the upper part of the pipe
Switzerland, a corporation of Switzerland
Original application Nov. 8, 1956, Ser. No. 621,116.
2. The material continuously added to the lower end of
Divided and this application Oct. 19, 1959, Ser. No.
this. column lifts the column so that particles at the top
10 thereof flow over the edge at the liquid level 19 and slide
sl claims. (cl. 16a-_237)
to the level 20 which is lower by the distance l1. There
they form a second material column 24 which floats
This invention relates to apparatus for carrying out a
on the liquid column 18. Column 18 seals the exit path
continuous process for treating fibrous material in the
from the vacuum chamber 1 against the entrance of air.
production of cellulose or semi-cellulose, in which the
fibrous material is impregnated with a digesting liquid 15 As thermaterial column 24 grows, its portion lying be
low the liquid level 26 reaches the screw conveyor 11i
and, after being freed from excess liquor, is heated and
which takes the particles downward.
digested in an -ambient of steam.
The submerged depth of the material column 24 is thus
The present application is a division of my application
kept constant, as is the height of the part of the column
Serial No. 621,116, tiled November 8, 1956, now aban
doned, and is offered pursuant to the examiner’s require 20 lying above the level 20. This last contains the major
portionof the iibrous material situated in the vacuum
ment for restriction.
chamber 1'. This, and also the part of the column 23 lying
In a known process of this kind, impregnation of the
above the level 19‘, are exposed infthe chamber 1 where
ñbrous material with digesting liquor takes place at su
air readily separates out under the action of the vacuum.
peratmospheric pressure and at a temperature of 100° to
25 The air is withdrawn by the pump 6. The particles reach
120° C.
ing the conveyor 10 are taken downward through the liq
The aim of the invention is to simplify the process and
uid column 18 where the proper impregnation is com
the the same time to improve de-aerating of the ñbrous
plated. >The particles then reach the container 5 and are
material. To this end, according to the invention, in a
removed by a conveyor belt 25 driven by means not
process of the kind specified, the vfibrous material is sub
jected to a vacuum in the course of its being impregnated 30 shown.
with the digesting liquor.
The invention also extends to apparatus for continuous
ly carrying out this process, the apparatus comprising a
vacuum chamber which is sealed at its inlet and outlet side
The digesting liquor absorbed by the fibrous material
during its passage through the apparatus is continuously
replaced'through the pipe 12 which opens into the con
tainerl 4, i.e., into the part of the apparatus lying on the
for the Íibrous‘material to be impregnated, by a column 35 inlet side of the vacuum chamber. rl'he valve 13 opens
whenever one of the liquid levels 14, 15 drops below the
of digesting liquor.
respective senser 16. The new liquor supplied to the con
The accompanying drawings depict an example of ap
tainer 4 rises with the liquid column 17 , runs over the edge
paratus for carrying out the process according to the in
at level 1.9, through the vacuum chamber 1 into the liquid
vention, in which drawings:
FIG. 1 is a sectional elevation of the de-aerating and 40 column 18 and down it into the container S.
The rising new liquor in the column 17 assists the ele
impregnating apparatus.
FIG. 2 is a sectional elevation of the digester.
According to FIG. 1, a vacuum chamber 1 has two
downwardly extending pipes 2 and 3. The pipe 2 dips
into an open container 4 and the pipe 3 into an open
container 5. The Vacuum chamber 1 is in communica
tion with a vacuum pump 6. A pipe 7 carries a feed fun
nel 8 at its upper end and extends into a downwardly
open chamber 9 below the downwardly open pipe 2.
vation of the fibrous material. However, conveyor means
such as a screw may also be arranged in the pipe 2 for
that purpose.
The iibrous material may also be moved mechanically
from the pipe 2 to the pipe 3 within the Vacuum chamber.
In that case, the screw 10` may project beyond the liquid
level 20 in the pipe 3. The mechanically moved material
would then represent the material content of the vacuum
Within the pipe 3 there is a screw conveyor 10 which is 50 chamber.
Similarly, the material in the pipe 7 may be moved me
driven by a motor 101 and the upper end of which extends
to a height 11.
The speed of the various conveyor means is preferably
A pipe 12 which has a valve 13 built into it and opens
into the container 4, supplies digesting liquor. The lat
ter is at a level 14. The container 5 is lower than the 55 The digester, according to FIG. 2 comprises a pressure
chamber defined by a vertical casing 31. The impreg
container 4 and contains digesting liquor up to a level 15.
nated fibrous material which is removed from the con
The liquid surface 15 is thus lower than the surface 14
tainer 5 by the conveyor belt 25, is continuously intro
by an amount h. The valve 13 is controlled by sensers
duced at the top of the casing 31 by a rotary feeder 32
16 which control the liquid levels in the containers 4 and 5.
By Virtue of the vacuum in the chamber 1, which is 60 from a funnel 33. The feeder 32 is driven by a motor 34.
produced by the vacuum pump 6, digesting liquor is
sucked from the containers 4, 5 through the pipes 2 and 3,
The feeder 32 seals the interior of the casing 31 from
the atmosphere.
The fibrous material introduced into the digester con
respectively, so that liquid columns 17, 18 are formed to
only the quantity of digesting liquor which replaces
a level 19, 20 respectively. The level 20 is lower than
which has been extracted in the vacuum chamber,
19 by the same amount h.
and no liquid bath is provided within the casing 31. The
The illustrated apparatus works continuously. The
iibrous material to be treated enters the pipe 7 via a con
veyor belt 21, driven by means not shown, and the
funnel 8. There it forms a floating material column 22.
fibrous `material is raised quickly to the digestion tempera
ture by injecting steam under pressure through a conduit
35 with built in valve 36, and digestion thus is effected
in an ambient of steam.
The weight of newly arriving material presses this col 70 To discharge the cooked product from the casing 31,
umn downward, thus pushing particles of material from
a delivery worm 37 driven by a motor 38 is provided at
its lower end. The cooked product leaves the pressure
chamber through an opening 39, in advance of which is a
delivery stirrer 40 driven by a motor 41.
For operating the apparatus in a continuous process,
the introduction of the material and the output of the de
livery worm are to be controlled in relation to each other in
such a manner that the pressure chamber is always filled
with the impregnated fibrous material up to a certain level
of the de-aerated material with digesting liquor takes
place, the upper end of the mechanical means being be
neath the liquid level maintained in said other tubular
member; means for collecting the impregnated material
in the other container below the liquid level therein; and
means for separating excess liquor from the collected ma
2,. The apparatus defined in claim 1 in which the means
serving to introduce the fibrous material includes a pipe
extending into said one container, with its outlet below
the lower opening of the tubular member serving to sup
ply material to the vacuum chamber.
5 is required in order to afford complete digestion within
3. In combination the apparatus defined in claim l and
the casing 31.
a digester comprising »a vessel enclosing a pressure cham
What is claimed is:
1. Apparatus for continuously impregnating and de 15 ber; means for continuously introducing the said collected
impregnated material, from which the excess liquor is
aerating fibrous material in the production of cellulose or
separated, into said vessel at the top of the vessel; means
semi-cellulose comprising in combination a casing en
for supplying steam under pressure to said pressure cham
closing a vacuum chamber; two tubular members extend
ber, so that the impregnated material is brought to cook
ing downward from said chamber, one serving for the
supply of the fibrous material to the vacuum chamber 20 ing temperature; and means for continuously discharging
in order to obtain sufficient time for the throughput of the
material. Furthermore, sufficient concentration of chem
icals in the impregnating liquor contained in the container
the material from the bottom of the vessel after digestion
and the other serving for the discharge of the material
from the vacuum chamber, the supply member having its
is completed.
upper end connected with the vacuum chamber at a point
at least as high as the connection between the upper end
4. The apparatus defined in claim 1 in which the said
means for conveying the de-aerated material downward
of the discharge member and the vacuum chamber; two 25 from the vacuum chamber comprise a screw conveyor ar
ranged near the top of said other tubular member below
containers open to atmosphere; means supplying digesting
the liquid level so as to continuously discharge de-aerated
liquor to said containers, the supply member having its
material from the vacuum chamber.
lower end communicating with the interior of one of said
5. The apparatus defined in claim l in which said one
containers below the liquid level therein, the discharge
member having its lower end communicating with the in 30 tubular member opens into the vacuum chamber at level
higher than the level at which said other tubular member
terior of the other container below the liquid level therein;
opens into said vacuum chamber.
means responsive to the level of liquid in said containers
controlling the level of liquor in said members whereby
each is substantially filled with liquor; means opening into
said one container below the liquid level maintained 35
therein for introducing fibrous material into the lower end
of said one member whereby said material rises within
said one member to the vacuum chamber and air there
separates from the material under the action of the vacu
um; means for removing the separated air from the 40
vacuum chamber; mechanical means for conveying the de
aerated material downward through the column of digest
ing liquor in said other member in which impregnation
References Cited in the file of this patent
Wood ________________ __ Dec. 5, 1933
Branzell ______________ __ Oct. 3, 1944
Plunguian ____________ __ May 3l, 1955
Sweden ______________ __ Apr. 29, 1952
France ________________ __ Feb. 9, 1955
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