IMPROVEMENTS IN THE MANU- PACTURE OF SULPHATE OF SODA and Sulphate OP POTASSA
Year: 1873

page_text: LETTERS PATENT to James Hargreaves, of Widnes, in the County
of Lancaster, Chemist, and Thomas Robinson, of the same Place,
Ironfounder, for the Invention of "IMPROVEMENTS IN THE MANU-
PACTURE OF SULPHATE OF SODA and Sulphate OP POTASSA."
Scaled the 19th August 1873, and dated tho 22nd February 1873.
PROVISIONAL SPECIFICATION left by the said James Hargreaves and
Thomas Robinson at the Office of the Commissioners of Patents,
with their Petition, on the 22nd February 1873.
We, JAMES HARGREAVES, of Widnes, in the County of Lancaster,
Chemist, and THOMAS ROBINSON, of the samo Place, Ironfounder, do
hereby declare the nature of the said Invention for "IMPROVEMENTS IN
THE MANUFACTURE OF SULPHATE OF SODA AND SULPHATE OF POTASsa,” to bo as
follows:-
Our said Invention relates to the production of sulphates of soda
and potassa, or either of them, by the direct action of sulphurous acid
or sulphuric acid vapour upon chloride of sodium and chlorido
of potassium.

page_text: First. To ensure that the lumps of chloride to be converted are harder
and less likely to produce dust when being handled wo moisten the said
chlorides, or either of them, with solutions of sulphato of soda or sulphate
of potassa, or we add sulphate of soda or sulphate of potassa to the said
chlorides before moistening, and then dry the mixed mass, afterwards
breaking it to pieces of suitable size.
Second. To render more rapid the action of sulphurous acid upon the
said chlorides, or either of them, when in the converting chambers, we
add solutions containing salts of copper, zinc, manganese, or chromium,
or salts thereof, preferably in solution, to the said chlorides, or either of
them, preferably before the mass is dried and broken into pieces. Wo
prefer to add about one per cent. of one or other of the said metals,
preferably in the form of sulphate or chloride, to the chloride of sodium
or chloride of potassium.
Third. To prevent nuisance arising from the gases contained in the
chambers containing finished sulphate of soda or sulphate of potassa, we
displace the hydrochloric, sulphurous, or sulphuric acid by steam or
atmospheric air, and force the said hydrochloric acid, sulphurous or
sulphuric acid into the next succeeding chamber or into the exit fluo
leading to the condensing apparatus.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said James Hargreaves and Thomas Robinson in the
Great Seal Patent Office on the 22nd August 1873.
TO ALL TO WHOM THESE PRESENTS SHALL COME, wc, JAMES
HARGREAVES, of Widnes, in the County of Lancaster, Chemist, and 2
THOMAS ROBINSON, of the same Place, Ironfounder, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Twenty-second day of February, in the year
of our Lord One thousand eight hundred and seventy-three, in the thirty-
seventh year of Her reign, did, for Herself, Her heirs and successors, give 3
and grant unto us, the said James Hargreaves and Thomas Robinson, IIer
special licence that we, the said James Hargreaves and Thomas Robinson,
our executors, administrators, and assigns, or such others as we, the said
James Hargreaves and Thomas Robinson, our executors, administrators,

page_text: PUBLISOIL & PLM PTS, INING MURUJactureų suprate of Douage.
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 Islo
of Man, an Invention for " IMPROVEMENTS IN THE MANUFACTURE OF SULPHATE
or Soda and SULPHATE OF POTASSA," upon the condition (amongst others)
that we, tho said James Hargreaves and Thomas Robinson, our executors
or administrators, by an instrument in writing under our, or their, or
one of our or their hands and scals, should particularly describe and
ascertain the nature of tho said Invention, and in what manner the
samo was to bo performed, and cause the samo 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 we, the said James Hargreaves and Thomas
Robinson, do hereby declare the nature of our said Invention, and in
what manner the same is to be performed, to be particularly described
and ascertained in and by the following statement, that is to say :-
Our said Invention relates to the production of sulphates of soda
and potassa, or either of them, by the direct action of sulphurous acid
or sulphuric acid vapour upon chloride of sodium and chlorido
of potassium.
First. To ensure that the lumps of chloride to be converted are harder
and less likely to produce dust when being handled we moisten the
said chlorides, or either of them, with solutions of sulphate of soda, or
sulphato of potassa; or wo add sulphate of soda or sulphate of potassa
to tho said chlorides before moistening, and then dry the mixed mass,
afterwards breaking it into pieces of suitable size.
Second. To render moro rapid the action of sulphurous acid upon
tho
said chlorides, or either of them, when in the converting chambers, wo
add copper, zinc, manganese, or chromium, or salts thereof, preferably
in solution to the said chlorides, or either of them, preferably before the
mass is dried and broken into pieces. We prefer to add about one per
cent. of one or other of the said metals, proferably in the form of
sulphate or chloride, to the chloride of sodium or chlorido of potassium.
Third. To prevent nuisance arising from the gases contained in tho
chambers containing finished sulphate of soda or sulphate of potassa, wo
displace the hydrochloric, sulphurous, or sulphuric acid by steam or

page_text: In the presence of
JAMES JOHNSON, '
Clerk to J. T. King,
Patent Agent,
Liverpool.
JAMES HARGREAVES. (L.s.)