IMPROVEMENTS IN EVAPORATING PANS FOR CONCENTRATING SOLUTIONS OF CERTAIN ACIDS, ALKALIES, AND SALTS.
Year: 1854

page_text: LETTERS PATENT to William Collier, of Weston, in the County of
Chester, Chemist, for the Invention of "IMPROVEMENTS IN EVAPORATING
PANS FOR CONCENTRATING SOLUTIONS OF CERTAIN ACIDS, ALKALIES, AND SALTS.
PROVISIONAL SPECIFICATION left by the said William Collier at the
Office of the Commissioners of Patents, with his Petition, on the 25th
April 1854.
I, WILLIAM COLLIER, of Weston, in the County of Chester, Chemist, do
hereby declare the nature of the said Invention for "IMPROVEMENTS IN EVAPO-
RATING PANS FOR CONCENTRATING SOLUTIONS OF CERTAIN ACIDS, ALKALIES, AND
SALTS," to be as follows:-
The pans at present employed in chemical works for the concentration of
dilute acids and various alkaliné and saline solutions are usually composed of
lead or iron, and exposed to the naked fire, as in using ordinary boilers or coppers.
Now my improvements relate to the manufacture and employment of double-
bodied pans, so constructed that the external pan acts merely as a steam jacket
or casing around the internal pan, being rivetted or otherwise secured thereto
where their upper edges meet, and is further supplied with a pipe at one side,
through which to admit of steam, and a pipe below, through which to carry off-the-
condensed stean; or these pipes may be placed in any other convenient manner;
and the heating process may be kept up by circulating hot water from an

page_text: adjacent boiler, instead of using steam, by arrangements well known in the
employment of hot water and steam for general heating purposes.
I recommend staying large pans by means of short stays or bolts between
the outside of the pan, and the inside of the casing rivetted or screwed to each;
and I sometimes coat the outside of the steam chest or casing with felt, or
surround it with charcoal or other non-conductor of heat.
I do not limit myself to any particular metal in the construction of my
improved pans for boiling and evaporating; but what I claim as the novelty
herein is, the application-of-the-mode-of-manufacturing-concentrating pans,
sometimes called decomposing pans, as described, for the purpose of con-
centrating dilute sulphuric and other acids, and solutions of alkalies and
salts.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by.. the said William -Colliers in the: Great Seal Patent Office on the
20th October 1854.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, WILLIAM
COLLIER, of Weston, in the County of Chester, Chemist, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Twenty-fifth day of April, in the year of our Lord
One thousand eight hundred and fifty-four, in the seventeenth year of Her
reign, did, for Herself, Her. heirs and successors,. give and grant unto me, the
said William Collier, Her special licence that I, the said William Collier,
my executors, administrators, and assigns, or such others as I, the said
William Collier, my exécutors, 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 and Ireland,
the Channel Islands, and Isle of Man, an Invention for IMPROVEMENTS-
IN EVAPORATING PANS FOR CONCENTRATING SOLUTIONS OF CERTAIN ACIDS, ALKALIES,
AND SALTS;" upon the condition (amongst others) that I, the said William
Collier, by an instrument in writing under my hand and seal, should particu-
larly 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 William Collier, do hereby declare
the nature of my said Invention, and in what manner the same is to be

page_text: performed, to be particularly described and ascertained in and by the following
statement:-
My said Invention relates to the application of steam to pans for evaporating
certain chemical solutions, in lieu of the pans at present employed in chemical
works for the concentration of dilute sulphuric acid and other acids, and various
alkaline and saline solutions; which pans are usually composed of lead or iron,
and exposed to the naked or open fire, as in using ordinary boilers or coppers.
Now my said improvements relate to the manufacture and employment of
double-bodied pans, so constructed that the external pan acts merely as a steam
jacket or casing around the internal pan, being rivetted or otherwise secured
thereto where their upper edges meet; and is further supplied with a pipe at
one side, through which to admit steam, and a pipe below, through which to
carry off the condensed steam; or these pipes may be placed in any other con-
venient manner, and the heating process may also, if desired, be kept up by
circulating hot water from an adjoining boiler, instead of using steam, by
arrangements well known in the employment of hot water and of steam for
general heating purposes.
I would here observe that I recommend for large pans, staying them by
means of short stays or bolts between the outside of the pan and the inside of
the steam jacket or casing rivetted or screwed to each; and I sometimes
coat the outside of the steam jacket or casing with felt, or surround it with
charcoal or any other suitable non-conductor of heat.
I do not limit myself to any particular metal or combination of metals in the
construction of my improved pans for boiling and evaporating, or to the precise
form or dimensions thereof; but what I claim as my Invention is, namely,
the application of the mode of manufacturing decomposing or evaporating
pans employed for concentrating dilute sulphuric and other acids, and solutions
of alkalies and salts, as described.
In witness whereof, I, the said William Collier, have hereunto set my
hand and seal, this Twenty-first day of October, in the year of our
Lord 1854
WILLIAM COLLIER. (L.S.)