IMPROVEMENTS IN MEANS OF AND APPARATUS FOR RECOVERING SODA USED IN MAKING WOOD PULP STUFF AND OTHER SIMILAR MATTER.”
Year: 1882

page_text: LETTERS PATENT to Henrik Christian Fridrik Störmer, of the City of Paris,
Republic of France, for an Invention of "IMPROVEMENTS IN MEANS OF AND
APPARATUS FOR RECOVERING SODA USED IN MAKING WOOD PULP STUFF
AND OTHER SIMILAR MATTER.”
PROVISIONAL SPECIFICATION left by the said Henrik Christian Fridrik
Störmer at the Office of the Commissioners of Patents on the 18th February
1882.
HENRIK CHRISTIAN FRIDRIK STÖRMER, of the City of Paris, Republic of France.
"IMPROVEMENTS IN MEANS OF AND APPARATUS FOR RECOVERING SODA USED IN
MAKING WOOD PULP STUFF AND OTHER SIMILAR MATTER."
This Invention relates to certain improvements in means of or apparatus for
recovering soda used in making wood pulp stuff and other similar matter and
consists of a furnace which heats directly a boiler of any kind in which is poured
the lye wash containing the soda to be recovered.
Two or more other boilers of any system whatever are placed in communication
with the first boiler and which are not directly hented.
Steam pipes connect the boilers in order that the steam given off in the first
boiler may be able to pass into the second to be heated and so on for the third
boiler.
Tubes are provided between the boilers for the passage successively of the lye-
wash from one to the other more and more concentrated. The lye wash returns
through another tube in a very concentrated state in the furnace where it would
ignite and heat the first mentioned boiler.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Henrik Christian Fridrik Störmer in the Great Seal Patent Office
on the 18th August 1882.
HENRIK CHRISTIAN FREDRIK STÖRMER of the City of Paris Republic of France.
"IMPROVEMENTS IN MEANS OF AND APPARATUS FOR RECOVERING SODA USED IN
MAKING WOOD PULP STUFF AND OTHER SIMILAR MATTER."
This Invention relates to certain improvements in means of or apparatus for
recovering soda used in making wood pulp stuff and other similar matter and
consists of a furnace which hents directly a boiler of any kind in which is poured
the lye wash containing the soda to be recovered.
The Invention will be readily ascertained by the particular description wherein
reference is made to the accompanying Drawings.
A boiler B of suitable form is heated by the flames from a furnace A and this
boiler B may be arranged either above or beside this furnace. The vapour
generated in the boiler B passes through a steam pipe C and heats a second
boiler D through which it is conducted either by a coil or suitable arrangement of
tubes. The fluid contained in the boiler D will become evaporated by the heat
and the steam will pass thence through the pipe E and will be employed to heat
(as in the case for the boiler D) a third boiler F. The steam generated by the
evaporation of the fluids in the boiler F is conducted through a pipe G and used
either to heat the fluids contained in a fourth boiler or to boil the lye or to dry the
pulp and so on.
In applying this improved apparatus the boilers are at the outset filled with tho
lye containing the incrustations of the wood straw or other material and after
evaporation has set in the mother-lyo to be treated is pumped by any suitable
arrangement through the tube M into the boiler B. The lye then somewhat
concentrated passes through the tube N from the boiler B into the boiler D whilst
the steam from the boiler B passes through the tube C and heats the lye in the
boiler D. The lyo passes through the tube N¹ from D to F.
The steain condenses in the arrangement of tubes and flows away as condensed
water through taps into the open air.
The steam flowing through the tube E concentrates the lye in the boiler F.
In the case of soda, the mass contained and already greatly concentrated in the
boiler F finally flows through the tube O into the grate of the furnace A. where it
is calcined and reduced to ashos.
The different stages of treatment to which the mass is subjected represent
therefor a complete circuit.
When other chemicals are used the boiler is heated by any suitable furnace or
grate and the concentrated mass which is not to be calcined, is not to bo returned
to the first furnace.
The evaporation of resinous lye in one single boiler under pressure especially
when this is carried on to a great degree of concentration, is always subject to
danger, in consequenco of the sediments which are formed on the boiler plates but
in working according to this process the concentration of the mass does but begin
in one boiler before it is transmitted to the second one.
Moreover when for instance the first boiler has a pressure of say four atmospheres,
the lye which enters this boiler at say 70 degrees Celsius is brought up to a
temperature of 150°. When this lye flows into a second boiler where perhaps the
temperature is 125° with a proportionate pressure, the evaporation at once takes
place.
The same applies to the other boilers.

page_text: The pressure of the vapour for the evaporation in the different boilers may be for
instance: in B 50 lbs.; in D = 25 lbs; in E = 5 lbs.
Therefore the steam is able to force the lye from one boiler into the other (or in
the case of recovering soda into the furnace) because the pressure is greater than
the resistance and by the use of air pumps the lye can be pumped out of the last
boiler.
The lye can be forced out of one boiler into another either continuously or
periodically by opening the cocks y every time (where soda is being recovered)
when a charge is ready on the grate, or where other chemicals are being recovered,
when they are sufficiently concentrated in the last boiler.
The boilers are to be so constructed as to prevent priming and the formation of
scum.
If deemed advisable the first boiler can be filled with water instead of with lye
but this is less advantageous and is not necessary.
Likewise it is optional, in connection with the particular system to use a
proportionate number of air pumps.
Having now described the nature and particulars of the said Invention I
claim
The recovering of soda or other chemicals by means of two or more boilers B, D, F
connected in such wise that the lye is concentrated progressively in the first
boiler B by fire heat and in each suceeding boiler by the hot vapours or steam of the
preceding boiler whereby the lye is supplied continually from the lye apparatus to
the first boiler B and thence from boiler to boiler to the last boiler from whence it
returns in case of recovering soda to the grate of the first boiler or in recovering
other chemicals is conducted to where it can be utilized as set forth.
In witness whereof I the said Henrik Christian Fredrik Störmer have
hereunto set my hand and seal this Tenth day of August in the year of
our Lord One thousand eight hundred and eighty two.