IMPROVEMENTS RELATING TO THE MANUFACTURE OF CHLORINE BY MEANS OF COMPOUNDS OF MANGANESE REGENERATED IN THE WET WAY
Year: 1873

page_text: LETTERS PATENT to Walter Weldon, of 29, The Cedars, Putney, in the
County of Surrey, for the Invention of "IMPROVEMENTS RELATING TO
THE MANUFACTURE OF CHLORINE BY MEANS OF COMPOUNDS OF MANGANESE
REGENERATED IN THE WET WAY.”
Scaled the 8th August 1878, and dated the 11th March 1878.
PROVISIONAL SPECIFICATION left by the said Walter Weldon at the
Office of the Commissioners of Patents, with his Petition, on tho
11th March 1878.
I, WALTER WELDON, of 29, The Ocdars, Putney, in the County of
Surrey, do hereby declare the nature of the said Invention for "IMPROVE-
MENTS RELATING to the ManufacTURE OF CHLORITE BY MEANS OF COMPOUNDS OF
MANGANESE REGENERATED IN THE WET WAY," to be as follows:—
I. This Invention consists in certain improvements relating to the
process which is the subject of the following Patents already granted to
mo: No. 1918, July 26th, 1866; No. 183, January 18th, 1867;
No. 2501, September 4th, 1867; No. 565, February 20th, 1868;
No. 662, February 27th, 1868; and No. 782, March 10th, 1869.
"

page_text: II. The said improvements consist, firstly, in an improved method of
working the stills employed for the generation of chlorine in that process,
and in an improved method of treating the residual liquor produced in
them. In this improved method of working I add to the acid in the
stills an excess of manganese mud, in order that the whole or the greater
part of the last portions of the acid may be neutralized by the bases in
such excess of mud. I thereby obtain a residual liquor either completely
neutral or containing but very little free acid, but holding in suspension
a certain quantity of undissolved peroxide of manganese. If it contains
any free acid I neutralize it by means of lime. I then allow the liquor
to deposit the solid matters suspended in it and then employ the clear
part for the regeneration of compounds containing peroxide of manganese
as is practised at present. The doposit I allow to accumulate until the
peroxide of manganese in it constitutes a sufficient charge for a still,
and I then run it into a still and add to it a sufficient quantity of hydro-
chloric acid to dissolve the peroxide of manganese in it completely; I
thereby obtain this time a more or less acid residual liquor, which I
prefer to neutralize by limestone or other form of carbonate of lime, as
is at present practised; and this time after the solid matters in the
liquor have been allowed to settle, and the clear liquor has been drawn
off from above them, I wash the deposited matters and then throw them
away or otherwise remove them from the process. Carbonate of lime
may be employed instead of the lime above prescribed, but in such case
before employing for the generation of chlorine the deposit containing
the undissolved peroxide of manganese that deposit should be treated
with cold hydrochloric acid to dissolve out of it any excess of carbonate
of lime which may have been used.
III. The said improvements consist, secondly, in an improved method
of washing the deposit which forms in the neutralized chloride of
manganese liquors, in order to recover more of the manganese associated
therewith than is recovered therefrom at present, and to obtain it in the
state of a much stronger solution than is obtained by the present
methods of washing that deposit. To this end I employ the same wash
water several times, and wash the deposit several times, always employing
for the first washing of the deposit the wash water which has been
already used the largest number of times, and for the second washing of
the deposit the wash water which has been used the next largest number
of times, and proceeding in this way all through, using for each suc-
cessivo washing a weaker wash water than for the preceding one, until

page_text: the last washing is made with water which has not been used before
at all.
IV. The said improvements consist, thirdly, in neutralizing the still
liquor when it contains undissolved peroxide of manganeŝo in suspension
and is neutralized, after leaving the still, by either lime or a further
portion of manganese mud, in a well distinct from that employed for the
neutralization of the still liquor from time to time by carbonate of lime,
and in using for still liquor containing peroxide; of manganese in
suspension settling vessels distinct from those employed for a still
liquor resulting from the complete solution by an excess of acid of the
residues of operations in which an oxcess of manganese mud has been
used.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Walter Weldon in the Great Seal Patent Office
on the 5th September 1873.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, .WALTER
WELDON, formerly of 29, The Cedars, Putney, in the County of Surrey,.
now of Abboy Lodge, Merton, in the County of Surroy, sond greeting.
"
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Eleventh day of March, in the year
of our Lord One thousand eight hundred and seventy-throo, in the
thirty-sixth year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto me, the said Walter Weldon, Her special licence
that I, the said Walter Weldon, my executors, administrators, and
assigns, or such others as I, the said Walter Weldon, 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
thorein 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 "IMPROVEMENTS
RELATING TO THE MANUFACTURE OF CHLORINE BY MEANS OF COMPOUNDS OF
MANGANESE REGENERATED IN THE WET WAY," upon the condition (amongst
others) that I, the said Walter Weldon, my executors or administrators,
by an instrument in writing under my, or their, or one of their hands
and scals, should-particularly describo and ascertain the nature of the

page_text: 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 Walter Weldon, do hereby declare 5
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:-
I. This Invention consists in certain improvements relating to the
process which is the subject of the following Patents already granted to 1
me:—No. 1948, 26th July 1866; No. 133, 18th January 1867; No. 2501,
4th September 1867; No. 565, 20th February 1868; No. 662, 27th
February 1868; and No. 732, 10th March 1869.
The object of the said improvements is to diminish the loss of hydro-
chloric acid and of manganese at present occurring in that process.
1
II. The said improvements consist, firstly, in an improved method of
working the stills employed for the generation of chlorine in that process,
and in an improved method of treating the residual liquor produced in
them. In this improved method of working I add to the acid in the
stills an excess of manganese mud in order that the whole or the greater 2
part of the last portions of the acid may be neutralized by the bases in
such excess of mud. I thereby obtain a residual liquor either completely
neutral or containing but very little free acid, but holding in suspension
a certain quantity of undissolved peroxide of manganese. If it contains
any free acid I neutralize such free acid by means of lime. I then allow 2
the liquor to deposit the solid matters suspended in it, and thon employ
the clear part of such liquor for the regeneration of compounds con-
taining peroxide of manganese as is practised at present. The deposit I
allow to accumulate until the peroxide of manganese in it constitutes a
sufficient charge for a still, and I then run it into a still and add to it a 3
sufficient quantity of hydrochloric acid to dissolve the peroxide of
manganeso in it completely. I thereby obtain this time a more or less
acid residual liquor, which I prefer to neutralize by limestone or other
form of carbonate of lime as is at present practised; and this time, after
the solid matters in the liquor have been allowed to settle, and the clear 3
liquor has been drawn off from above them, I wash the deposited matters
and then throw them away, or otherwise remove them from the process.

page_text: Carbonato of lime may be employed instead of the lime above prescribed,
but in such case, before employing for the generation of chlorine the
deposit containing the undissolved peroxide of manganese, that deposit
should be treated with cold hydrochloric acid to dissolve out of it any
excess of carbonate of lime which may have been used.
III. The said improvements consist, secondly, in an improved method
of washing the deposit which forms in the neutralized chloride of man-
ganese liquors in order to recover more of the manganese associated
therowith than is recovered therefrom at present, and to obtain it in the
stato of a much stronger solution than is obtained by the present
methods of washing that deposit. To this end I employ the same wash
water several times, and wash the deposit several times, always employing
for the first washing of the deposit, the wash water which has been
already used the largest number of times, and for the second washing of
the deposit the wash water which has been used the next largest number
of times, and proceeding in this way all through, using for each suc-
cessive washing a weaker wash water than for the preceding one until the
last washing is mado with water which has not been used before at all.
IV. The said improvements consist, thirdly, in neutralizing the still liquor
when it contains undissolved peroxide of manganeso in suspension, and
is neutralized after leaving the still by either lime or a further portion of
manganeso mud in a well distinct from that employed for the neutraliza-
tion of the still liquor from time to time by carbonate of lime, and in
using for still liquor containing peroxide of manganese in suspension
settling vessels distinct from those employed for a still liquor resulting
from the complete solution by an excess of acid of the residues of
operations in which an excess of manganeso mud has been used.
In witness whereof, I, the said Walter Weldon, have hereunto
set my hand and seal, this Third day of September, in the year
of our Lord One thousand eight hundred and seventy-three.
TTAT MOD WALTON