An IMPROVED METHOD OF PRODUCING OR PREPARING SULPHATE OF SODA, SODA, SUB- CARBONATE OF SODA, AND MURIATIC ACID
Year: 1819

page_text: FULLER'S SPECIFICATION..
TO WHOM THESE PRESENTS SHALL COME, I, HENRY PETER
FULLER, of Piccadilly, in the Parish of Saint George, Hanover Square, in the
County of Middlesex, Surgeon and Apothecary, send greeting.
WHEREAS His most Excellent Majesty King George the Third did, by
His Letters Patent under the Great Seal of the United Kingdom of Great.
Britain and Ireland, bearing date at Westminster, the Third day of April,
in the fifty-ninth year of 'His reign, give and grant unto me, the said Henry
Peter Fuller, my exórs, àdmors, and assigns; His especial licence; full power,
sole privilège and authority; that I, the said Henry Peter Fuller, my exors,
admors, and assigns, should and lawfully might make, use, exercise, and vend,
within England; Wales; and the Town of Berwick-upon-Tweed, and also in
all His Majesty's Colonies and Plantations abroad, my Invention of "An
IMPROVED METHOD OF PRODUCING OR PREPARING SULPHATE OF SODA, SODA, SUB-
CARBONATE OF SODA, AND MURIATIC ACID;" in which said Letters Patent there
is contained a "proviso that if I, the said Henry Peter Fuller, shall not
particularly describe' and' ascertain the nature of my said Invention," and "in
what manner the same is, to be performed, by an instrument in writing under
my hand and seal, and cause the same to be inrolled in His Majesty's High
Court of Chancery within six calendar months next and immediately after
the date of these "our Letters Patent, that then the said Letters: Patent, and
all liberties and advantages whatsoever thereby granted, shall utterly cease,
determine, and become void, as in and by the same; relation being thereunto
had, may more fully and at large appear."

page_text: NOW KNOW YE, that in compliance with the said proviso, I, the said
Henry Peter Fuller, do hereby. declare that the nature of my said Invention,
and the manner in which the same is to be performed, are particularly
described and ascertained in and by the following description thereof (that
is to say):
A solution of muriate of soda, prepared either by dissolving muriate of
soda in hot or cold water, or evaporating sea water, and which solution may
contain any quantity of muriate of soda that is or may be soluble in water,
is to be mixed with a solution of sulphate of iron in such quantity that there
shall be forty-seven parts and a quarter, or thereabouts, of the sulphate of
iron to twenty parts or thereabouts of the muriates of soda. These materials so
combined are to be submitted to heat, so as to evaporate-nearly the whole of
the water. The remaining mass or quantity is then to be exposed to, a full
red heat in a retort of cast iron, or of any other material that is capable. of
bearing the fire (but the particular form or size of the retorts I do not feel neces-
sary to specify, as that is not of importance for the performance of the process),
for the purpose of distilling over the muriatic acid which will be separated
by. the heat from the aforesaid mass or residue left from the above-mentioned
solutions of muriate of soda and sulphate of iron, but which solutions, after
they have been mixed, as above directed, will be found to be changed; or
nearly so, into solutions of muriate of iron and sulphate of soda, and which
muriatic acid is to be received into a condensing receiver containing any quantity
of water, when the whole of the acid, or nearly so, has been drawn over, the
residue, which will be found to contain sulphate of soda and oxyd of iron,
partly or almost entirely in a nucaceous form, or with some trifling quantity
of muriate of soda, muriate of iron, and sulphate of iron, must be dissolved
either in hot, or cold water, and filtered to separate the oxyd of iron.
The mode or modes of dissolving the mass and filtering the solution I do
not feel at all necessary to specify, as any particular mode is unimportant, and
the mode of doing it will occur to every one acquainted with such operations.
The aforesaid solution of sulphate of soda is now to be mixed with a solution
of caustic..or pure barytes, prepared by burning or calcining carbonate of
barytes, and then dissolving it in water in such quantity or quantities that
there shall be to every twenty parts of muriate of soda or thereabouts used
in the first parts of the process, twenty-seven parts or thereabouts of pure
or caustic barytes. The produce of this will be pure or nearly pure soda and
sulphate of barytes. The soda is now to be separated from the sulphate of
barytes by filtration, or any other method, but any peculiar mode or manner
is not necessary to be specified. If the subcarbonate of soda is to be prepared

page_text: the solution of pure soda is to be combined with the carbonic acid expelled
from the carbonate of barytes or carbonate of lime by burning or calcining
them, or by any other method; but the manner of adding the carbonic acid I
do not claim to be peculiar, except as is above specified; the refuse is to be
applied to other useful purposes. The above are the proportions I usually
employ, but 1 reserve to myself the privilege of using any other proportions
may hereafter think fit, or that may answer the same end.
I
In witness whereof, I, the said Henry Peter Fuller, have hereunto
set my hand and seal, this Thirtieth day of September, in the year of
our Lord One thousand eight hundred and nineteen.