AN IMPROVED APPARATUS FOR AND METHOD OF TREATING WOOD AND OTHER SIMILAR
Year: 1872

page_text: LETTERS PATENT to Carl Dietrich Julius Seitz, of Edinburgh, North
Britain, Analytical Chemist, for the Invention of "AN IMPROVED
APPARATUS FOR AND METHOD OF TREATING WOOD AND OTHER SIMILAR SUB-
Sealed the 9th May 1873, and dated the 19th November 1872.
PROVISIONAL SPECIFICATION left by the said Carl Dietrich Julius
Seitz at the Office of the Commissioners of Patents, with his
Petition, on the 19th November 1872.
I, CARL DIETRICH JULIUS SEITZ, of Edinburgh, North Britain,
Analytical Chemist, do hereby declare the nature of the said Invention
for "AN IMPROVED APPARATUS FOR AND METHOD OF TREATING WOOD AND OTHER
SIMILAR SUBSTANCES FOR THE MANUFACTURE OF HALF STUFF AND PAPER," to be as
follows:-
My Invention relates to an improved apparatus and system for the
treatment of wood and other similar fibrous substances or materials, so

page_text: as to render it or them suitable alone or in combination for the manu-
facture of paper, and what is known in the paper trade as half stuff.
The special object of my Invention is to cause and insure a continuous
and uninterrupted circulation or flow of the caustic soda lyes throughout
the vessel wherein the wood is to be boiled.
The apparatus consists, first, of a boiler or kier of any suitable size, shape,
and construction, stationary or revolving; secondly, of a multitubular
boiler or any other kind of suitable heater or superheater of the required
dimensions, so constructed and placed that it may receive from a furnace
of its own or from waste heat any amount of heat desirable; thirdly,
between the kier or wood boiler proper containing the fibrous materials
to be operated upon, and the heater or superheater before named, a
pump or other suitable apparatus producing the same effect is placed,
and connected to both the wood boiler proper and to the heater or super-
heater. This pump is driven by suitable mechanical means, drawing
the lyes from the superheater, and forcing them on to the wood boiler;
and thus a constant and regular circulation is enforced throughout the
whole system, the entire apparatus being so constructed, arranged, and
worked that whilst the cooler portions of lye are caused to leave the
vessel containing the wood under treatment to be reheated by passing
through the heater or superheater up to any desirable degree of heat,
they are by means of the pumps replaced by heated or superheated
portions of lye.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Carl Dietrich Julius Seitz in the Great Seal
Patent Office on the 19th May 1873.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, CARL
DIETRICH JULIUS SEITZ, of Edinburgh, North Britain, Analytical 30
Chemist, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria. by Her Letters

page_text: Lord One thousand eight hundred and seventy-two, in the thirty-sixth year
of Her reign, did, for Herself, Her heirs and successors, give and grant
unto me, the said Carl Dietrich Julius Seitz, Her special licence that I,
the said Carl Dietrich Julius Seitz, my executors, administrators, and
assigns, or such others as I, the said Carl Dietrich Julius Seitz,
my executors, administrators, and assigns, should at any time agree
with, and no others, from time to time and at, all times thereafter
during the term therein expressed, should and lawfully might make,
use, exercise, and vend, within the United Kingdom of Great Britain
and Ireland; the Channel Islands, and Isle of Man, an Invention for
"AN IMPROVED APPARATUS FOR AND METHOD OF TREATING WOOD AND OTHER
SIMILAR SUBSTANCES FOR THE MANUFACTURE OF HALF STUFF AND PAPER," upon
the condition (amongst others) that I, the said Carl Dietrich Julius
Seitz, my executors or administrators, by an instrument in writing under
my, or their, or one of their hands and seals, should particularly
describe and ascertain the nature of the said Invention, and in what
manner the same was to be performed, and cause the same to be filed
in the Great Seal Patent Office within six calendar months next and
immediately after the date of the said Letters Patent.
NOW KNOW YE, that I, the said Carl Dietrich Julius Seitz, do
hereby declare the nature of my said Invention, and in what manner
the same is to be performed, to be particularly described and ascer-
tained in and by the following statement thereof, reference being had to
the Drawings hereunto annexed, that is to say :-
My Invention relates to an improved apparatus and system for the
treatment of wood and other similar fibrous substances or materials, so
as to render it or them suitable alone or in combination for the manu-
facture of paper, and what is known in the paper trade as half stuff.
The special object of my Invention is to cause and ensure a continuous
and uninterrupted circulation of the caustic soda lyes throughout the
vessel wherein the wood is to be boiled.
The apparatus consists, firstly, of a boiler or kier of any suitable size,
shape, and construction, stationary or revolving; secondly, of a multi-
tubular boiler or any other kind of suitable heater or superheater of the
required dimensions, so constructed and placed that it may receive from
a furnace of its own or from waste heat any amount of heat desirable;
thirdly, between the kier or wood boiler proper containing the fibrous

page_text: materials to be operated upon, and the heater or superheater before
named, a pump or other suitable apparatus producing the same effect is
placed and connected to both the wood boiler proper and to the heater
or superheater. This pump is driven by suitable mechanical means, and
it enforces a constant and regular circulation throughout the whole i
system, the entire apparatus being so constructed, arranged, and worked
that whilst the cooler portions of lye are caused to leave the vessel con-
taining the wood under treatment to be reheated by passing through
the heater or superheater up to any desirable degree of heat, they are
by means of the pump replaced by heated or superheated portions.
of lye.
The degree of heat to be given and the speed of the circulation may
be regulated at will according to circumstances and requirements.
In order to more fully explain the principle of my Invention and the
manner in which I make use of it in practice, I have added a sketch,
which, together with the following description, will fully and clearly
illustrate my intention.
B is the boiler or kier, the construction, shape, and size of which may
be varied; from it a pipe a leads to the circulating pump P. Through
this pipe a the pump P draws the cooler portions of the caustic lyes,
and forwards them through the pipe c into the heater or superheater H
in their passage through the same to be reheated, and through this
heater H by means of the pipe inlet 6 into the boiler.
The operation is as follows:- -The boiler B is first filled with the wood to
be treated, cut into suitable chips up to the very top; then the hot caustic
soda lyes are admitted into boiler, circulating pump, heater, and pipes;
when the whole system has been quite filled to overflowing every valve
or cock is securely fastened down; heat is applied to the heater H,
and the circulating pump P is set in motion, passing the lyes from
boiler into heater, and back again into boiler at a sufficient speed, and
for as long a time as is found to be necessary for the various kinds of
woods or other similar fibrous substances under treatment. The heat to
be applied, the speed of circulation, and the length of boiling vary of
course according to the materials under treatment and the qualities
of pulp required, and will soon be ascertained by any practical man.
Having now fully described the special object of my Invention, and in
what manner I carry the same into practice, I claim as my Invention

page_text: and as novel, an artificial, regular, and uninterrupted circulation at any
speed required of hot caustic lyes throughout the vessel wherein the
materials are under treatment, and during the whole time of boiling,
for the purposes and in the manner and as herein-before described.
In witness whereof, I, the said Carl Dietrich Julius Seitz, have
hereunto set my hand and seal, this Sixteenth day of May,
One thousand eight hundred and seventy-three.
CARL DIETRICH JULIUS SEITZ. (L.S.)