AN IMPROVED METHOD OF RE-UTILIZING CAUSTIC SODA LYE
Year: 1870

page_text: LETTERS PATENT to Emil Kruger, of Portobello, in the County of.
Mid Lothian, North Britain, for the Invention of "AN IMPROVED
METHOD OF RE-UTILIZING CAUSTIC SODA LYE."
•
Sealed the 2nd August 1870, and dated the 8th February 1870.
PROVISIONAL SPECIFICATION left by the said Emil Kruger at the
Office of the Commissioners of Patents, with his Petition, on the
8th February 1870.
I, EMIL KRUGER, of Portobello, in the County of Mid Lothian, North
Britain, do hereby declare the nature of the said Invention of "AN
IMPROVED METHOD OF RE-UTILIZING CAUSTIC SODA, LYE," to be as follows, that
is to say:
In the preparation of rags; esparto grass, straw, wood, or other fibrous.
substances. for the manufacture of paper a lye of caustic soda is used for..
extracting the soluble matters therefrom, and by the usual process of
manufacture the lye after being thus once used is wasted.
This Invention then relates to so treating the lye after the first boiling
in it of the rags, esparto grass, or other fibrous substances that the lye
may be re-utilized-in-the-process of boiling rags, esparto grass, or other
fibrous substances, and this is effected in the following manner :-After

page_text: the soluble matters are extracted from the rags, esparto grass, and other
fibrous substances the lye is discharged from the boiling apparatus into
a cistern or other vessel, or into another boiling apparatus, wherein it is
treated with the addition of lime or other similar substance, after which
for re-utilization it is pumped or discharged into the boiler wherein the
fibres or fibrous substances are to be boiled.
By means of the treatment herein-before described, alkali is saved and
less time is occupied in boiling.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Emil Kruger in the Great Seal Patent Office on ]
the 8th August 1870.
.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, EMIL
KRUGER, of Portobello, in the County of Mid Lothian, North Britain,
send grecting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her 1
Letters Patent, bearing date the Eighth day of February, in the year
of our Lord One thousand eight hundred and seventy, in the 33rd year
of Her reign, did, for Herself, Her heirs and successors, give and grant
unto me, the said Emil Kruger, Her special license that I, the said
Emil Kruger, my executors, administrators, and assigns, or such others 2
as I, the said Emil Kruger, my executors, administrators, or 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 2
of Man, an Invention for "AN IMPROVED METHOD OF RE-UTILIZING CAUSTIC
SODA LYE," upon the condition (amongst others) that I, tho said Emil
Kruger, by an instrument in writing under my hand and scal,
should particularly describe and ascertain the nature of tho said
Invention, and in what manner the same was to be performed, and a
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 Emil Kruger, do hereby declare
the nature of my said Invention, and in what manner the same is to

page_text: be performed, to be particularly described and ascertained in and by the
following statement, that is to say :—
.
My said Invention, which relates to the re-utilization of caustic soda
lyc, consists as follows:- In the process hitherto used in preparing
esparto grass, straw, wood, and other fibrous substances for the manu-
facture of paper a lye of caustic soda has been employed for extracting
the soluble matters therefrom, which lye after being thus once used has
been wasted or lost.
The object of this Invention then is to recover this waste lye, and to
re-utilize it after the first boiling in it of the esparto grass, or other
fibrous substance, and this is or may be effected (by preference) in
the following manner, that is to say --After the soluble matters are
extracted from the esparto grass and other fibrous substances the hot
lye is discharged from the boiling apparatus into a cistern or other
vessel, or into another boiling apparatus, wherein it is preferred to heat
it with the addition of lime or other similar substance, after which for
re-utilization it is pumped or discharged into the boiler wherein esparto
grass, rags, or other fibrous substances are to be boiled.
By means of the treatment herein-before described a great saving of
alkali and fuel is effected, and less time is occupied in boiling the esparto
grass, rags, or other fibrous substances.
'
Having now described the nature of my said Invention, and the manner
in which the same is or may be used or carried into effect, I would observe
in conclusion that what I consider, novel and original, and therefore
claim as the Invention secured to me by the herein-before in part recited
Letters Patent is, the treatment of waste or once used caustic soda lyc
in the manner herein-before described, in order to re-utilize it in
successive boilings of esparto grass, rags, or other fibrous substances.
In witness whereof, I, the said Emil Kruger, have hereunto set
my hand and seal, this Sixth day of August One thousand eight
hundred and seventy.