IMPROVEMENTS THE MANUFACTURE OF ACETATE OF LEAD
Year: 1865

page_text: LETTERS PATENT to Richard Archibald Brooman, of 166, Fleet Street, in
the City of London, Patent Agent, for the Invention of "IMPROVEMENTS
THE MANUFACTURE OF ACETATE OF LEAD."-A communication from
PROVISIONAL SPECIFICATION left by the said Richard Archibald Brooman
at the Office of the Commissioners of Patents, with his Petition, on the
29th December 1865.
I, RICHARD ARCHIBALD BROOMAN, of 166; Fleet Street, in the City of
London, Patent Agent, do hereby declare the nature of the said Invention
for "IMPROVEMENTS IN THE MANUFACTURE OF ACETATE OF LEAD," to be as
follows::
This Invention consists in manufacturing acetate of lead or salt of saturn.by
means of raw pyroligneous acid distilled or saturated with lime and decomposed
by sulphuric or muriatic acid; this product is then saturated with lead or its de-
rivatives, evaporated, crystallized, submitted to the action of a turbine (turbiné)
or pressed, then redissolved or remelted, evaporated, decolorized, and cleared,
and finally recrystallized. I proceed as follows:-I take distilled pyroligneons

page_text: acid, whatever be its crystallizable richness, and whether obtained by simple
carbonization or concentrated by lime and afterwards decomposed by sulphuric
or muriatic acid. I saturate it with lead or its derivatives to complete satu-
ration; it is even necessary that the liquors be supersaturated; in this manner
the deposits and impurities precipitate better. When the liquors have become
clear I add pyroligneous acid to bring them to the state of neutrality. Before
this addition of pyroligneous acid it is well, in order to precipitate the
deposits more promptly, to add a little lime, which in this instance is only for
removing the fatty matters, the liquors being supersaturated. If the acid is
weak the saturation will not be strong, and I make up for it by evaporating
in a copper vessel until I obtain an acid strength of 50° at the maximum
(45° will generally suffice); these liquors evaporate very easily and much
better than those arising from acetate of soda. When the evaporation has
been completed, that is to say, when the liquors mark the degree above
mentioned, I leave them for one or two hours to clear, and I then crystallize
them; these liquors in cooling become crystallized in a sort of paste of crystals
which appear sufficiently pure, and of other small globules which appear in
the form of small fungi. I crush the whole together and obtain a pasty
liquid, which I submit to the action of a press or of a turbine similar to those
used in the manufacture of sugar (turbine à sucre) until that which remains
in the press or turbine is perfectly drained. I withdraw the products which
have become dry; these dried products are redissolved in water until they
mark about 30°; I then add to each 100 lbs. of these liquors about 1 to
2 lbs. of chloride of lime in the state of paste or liquid, in order to remove from
the liquors the coloring matter which they contain and which is tenacious.
very
I leave the mixture until it becomes clear; I decant it, and bring it again to 45°.
I recrystallize it, and submit it again if necessary to the action of the turbine or
press, in order to redry it. It is not always necessary to submit it a second time
to the action of the turbine or press; it depends upon the richness and purity
of the acids employed: The product of the second operation in the turbine or
press is composed of small but very: white crystals, and it is only necessary to
remelt them once more, and by passing the liquors over a little animal black
I obtain very fine salt of saturn or acetate of lead quite as good as that
hitherto obtained by pure acid manufactured by acetate of soda. I treat the
mother waters as has been done with the saturations from which they arise.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by Amelia Susannah Brooman in the Great Seal Patent Office on the
29th June 1866.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, AMELIA
SUBANNAH BROOMAN, of Twickenham, in the County of Middlesex, Widow and
sole Executrix of Richard Archibald Broonian, late of 166, Fleet Street, in
the City of London, Patent Agent, deceased, send greeting..
WHEREAS Her most Excellent Majesty Queen Victoria, by Iler Letters
Patent, bearing date the Twenty-ninth day of December, in the year of our Lord
One thousand eight hundred and sixty-five, in the twenty-ninth year of Her
reign, did, for Herself, Her heirs and successors, give and grant unto me, "the
said Amelia Susannah Brooman, Her special licence that I, the said Amelia
Susannah Brooman, my executors, administrators, and assigns, or such others
as I, the said Amelia Susaunah Brooman, 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, excrcise, and vend, within the United Kingdom of Great
Britain and Ireland, the Channel Islands, and Isle of Man, an Invention
for "IMPROVEMENTS IN THE MANUFACTURE OF ACETATE OF LEAD," (communicated
to the said Richard Archibald Brooman from abroad by Jules Fournier
Laigny, of Courville, France,) upon the condition (amongst others) that
I, the said Amelia Susannah Brooman, 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 Amelia Susannah Brooman, do hereby
declare the nature of the said Invention, and in what manner the sanje
is to be performed, to be particularly described and ascertained in and by
the following statement thereof, that is to say:
This Invention consists in manufacturing acetate of lead or salt of saturn
by means of crude or raw pyroligneous .acid. distilled or saturated with lime
and decomposed by sulphuric or muriatic acid; this product is then saturated
with lead or its derivatives, evaporated, crystallized, submitted to the action
of a turbine (turbiné) or pressed, then redissolved or remelted, evaporated,
decolorized, and cleared, and finally recrystallized. I proceed as follows:-I

page_text: take distilled pyroligneous acid, whatever be its crystallizable richness, and
whether obtained by simple carbonization or concentrated by lime and after-
wards decomposed by sulphuric or muriatic acid. I saturate it with lead or
its derivatives to complete saturation; it is even necessary that the liquors
be supersaturated; in this manner the deposits and impurities precipitate
better. When the liquors have become clear I add pyroligneous acid to bring
them to the state of neutrality. Before this addition of pyroligneous acid it is
well, in order to precipitate the deposits more promptly, to add a little lime,
which in this instance is only for removing the fatty matters, the liquors being
supersaturated. If the acid is weak the saturation will not be strong, and I
make up for it by evaporating in a copper vessel until I obtain an acid strength
of 50° at the maximum (45° will generally suffice); these liquors evaporate very
easily and much better than those arising from acetate of soda. When the
evaporation has been completed, that is to say, when the liquors mark the
degree above mentioned, I leave them for one or two hours to clear, and I
then crystallize them; these liquors in cooling become crystallized in a sort
of paste of crystals which appear sufficiently pure, and of other small globules
which appear in the form of small fungi. I crush the whole together and
obtain a pasty liquid, which 1 submit to the action of a press or of a turbine
similar to those used in the manufacture of sugar (turbine à sucre) until that
which remains in the press or turbine is perfectly drained. I withdraw the
products which have become dry. The submitting of the pasty liquid to the
action of a turbine or press forms an important part of the process or
Invention. The dried products are redissolved in water until they mark
about 30°; I then add to each 100 lbs. of these liquors about 1 or 2 lbs. of
chloride of lime in the state of paste or liquid, in order to remove from the
liquors the coloring matter which they contain and which is very tenacious.
I leave the mixture until it becomes clear; I decant it, and bring it again
to 45°. I recrystallize it, and submit it again if necessary to the action of
the turbine or press in order to redry it. It is not always necessary to
submit it a second time to the action of the turbine or press; it depends upon
the richness and purity of the acids employed. The product of the second
operation in the turbine or press is composed of small but very white crystals,
and it is only necessary to redissolve them once more, and by passing the
liquors over a little animal black I obtain very fine salt of saturn or acetate
of lead quite as good as that hitherto obtained by pure acid manufactured by
acetate of soda. I treat the mother waters as has been done with the satu-
rations from which they arise.

page_text: And having now described the nature of the said Invention, and in what
manner the same is to be performed, I declare that I claim manufacturing
acetate of lead by the process berein-before described, that is to say, by
means of crude or raw pyroligneous acid distilled or saturated with lime and
decomposed by sulphuric or muriatic acid, then saturated with lead or its
derivatives, evaporated, crystallized, submitted to the action of a turbine or
pressed, then redissolved, evaporated, decolorized, and cleared, and finally
recrystallized.
In witness whereof, I, the said Amelia Susannah Brooman, have hereunto
set my hand and seal, this Twenty-sixth day of June, One thousand
eight hundred and sixty-six.
A. S. BROOMAN. (L.S.)