IMPROVED MEANS OR PROCESSES FOR TREATING WASTE ACIDS AND ALKALIES RESULTING FROM THE PREPARATION OF LIGNEOUS FIBRES OR BODIES TH STRADA PADED OR PAPER PULP "
Year: 1871

page_text: LETTERS PATENT to Alexander Annandale, the younger, of the
Beltonford Paper Mills, Dunbar, North Britain, for the Invention
of "IMPROVED MEANS OR PROCESSES FOR TREATING WASTE ACIDS AND
ALKALIES RESULTING FROM THE PREPARATION OF LIGNEOUS FIBRES OR BODIES
TH STRADA PADED OR PAPER PULP "
PROVISIONAL SPECIFICATION left by the said Alexander Annandale
at the Office of the Commissioners of Patents, with his Petition,
on the 24th November 1871.
I, ALEXANDER ANNANDALE, the younger, of the Beltonford Paper
Mills, Dunbar, North Britain, do hereby declare the nature of the said
Invention for "IMPROVED MEANS OR PROCESSES FOR TREATING WASTE ACIDS
AND ALKALIES RESULTING FROM THE PREPARATION OF LIGNEOUS FIBRES OR BODIES
USED IN THE MANUFACTURE OF PAPER OR PAPER PULP," to be as follows:
This Invention relates to certain means or processes for treating waste
acids and alkalies resulting from the preparation of ligneous fibres or
bodies to be used as pulp for paper, and consists,-

page_text: In first. Neutralising the acids and alkalies by mixing them and then
by boiling down the nitrate of soda, after first having separated ready
for further utilisation the resinous matters contained in the liquid.
In 2ndly. Neutralising the acids and alkalies by mixing them and
then by separating the nitrate of soda salt by the well-known salting-
down process, leaving the resinous matters in solution to be further
treated for recovery.
In 3rdly. Recovering the soda direct from the waste alkali lyes by
the well-known method of incineration in order to destroy the resinous
compounds by heat, and then dissolving the resulting ash in the waste
nitric acid; then getting a solution of nitrate of soda comparatively free
from foreign matter, which may then be reduced to nitrate of soda salt
in any well-known manner.
In 4thly. Treating the nitrate of soda salt obtained by any of the
aforesaid methods with the view of obtaining therefrom again nitric 1
acid.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Alexander Annandale in the Great Seal Patent
Office on the 23rd May 1872.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, ALEXANDER
ANNANDALE, the younger, of the Beltonford Paper Mills, Dunbar,
North Britain, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twenty-fourth day of November, in the
year of our Lord One thousand eight hundred and seventy-one, in the
thirty-fifth year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto me, the said Alexander Annandale, Her special
licence that I, the said Alexander Annandale, my executors, adminis-
trators, and assigns, or such others as I, the said Alexander Annandale,
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

page_text: and Ireland, the Channel Islands, and Isle of Man, an Invention for
"IMPROVED MEANS OR PROCESSES FOR TREATING WASTE ACIDS AND ALKALIS
RESULTING FROM THE PREPARATION OF LIGNEOUS FIBRES OR BODIES USED IN THE
MANUFACTURE OF PAPER OR PAPER PULP," upon the condition (amongst
others) that I, the said Alexander Annandale, my executors or adminis-
trators, 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 Alexander Annandale, do hereby
declare the nature of my said Invention, and in what manner the
same is to be performed, to be particularly described and ascertained
in and by the following statement thereof, that is to say :-
This Invention relates to certain means or processes for treating waste
acids and alkalis resulting from the preparation of ligneous fibres or
bodies to be used as pulp for paper or paper stuff, and consists in,-
First. Neutralising the waste acids and alkalis with each other by
mixing them, then adding a slight excess of the waste acid, and thus
precipitating the resinous and gummy compounds held in solution;
after separating this floculent precipitate either by settling or by filtra-
tion the nitrate of soda solution is boiled down by preference in open
pans or boats to the nitrate of soda salt. The precipitated resin and
gum may be washed and refined if desired.
Second. Neutralising the waste acids and alkalis with each other by
mixing them, then gradually concentrating the mixture solution of
nitrate of soda (by preference in open pans or boats), thus salting down
and fishing out the nitrate of soda salt, leaving the resinous and gummy
matters in the mother liquor to be thereafter washed and refined if
desired. The nitrate of soda salt is then allowed to drain itself dry,
or it may be dissolved in water and again salted down if required with
a view of greater purity..
Third. Recovering the soda direct from the waste alkali lyes by the
well-known method of boiling down and incineration in order to destroy
the resinous and gummy compounds by the action of heat, and then

page_text: dissolving the resulting soda ash, after having allowed it to burn itself
white or nearly white, in the waste nitric acid, thus getting a solution
of nitrate of soda comparatively free from foreign matter, which solution
is then boiled down or salted down (by preference in open pans or boats)
to the nitrate of soda salt.
Fourth. Treating the nitrate of soda salt obtained by any of the
aforesaid methods from the waste nitric acid and from the waste alkali
lyes with the view of manufacturing therefrom again nitric acid by the
ordinary and well-known method of manufacturing liquid nitric acid
from the native nitrate of soda or Chili saltpetre, that is, by digesting
the nitrate of soda salt with sulphuric acid and condensing the nitric
acid.
And having now described the nature of my said Invention, and in
what manner the same is to be performed, I declare that I claim, the
several processes herein-before described for the purposes specified, and
when employed in the treatment of waste acids and alkalis resulting
from the preparation of ligneous fibres or bodies.
In witness whereof, I, the said Alexander Annandale, have here-
unto set my hand and seal, this Twenty-first day of May One
thousand eight hundred and seventy-two.
ALEX". ANNANDALE, Jª. (L.S.)