IMPROVEMENTS IN EVAPORATING AND CONCENTRATING SOLUTIONS OF CAUSTIC SODA, POTASH, AND THEIR SALTS, AND LIQUORS OCCURING IN THE ON ORATIO Å CID AND ALSO GELATINE.”
Year: 1873

page_text: LETTERS PATENT to Richard Samuel Dale and John Dale, of
Manchester, in the County of Lancaster, Chemists, for the Inven-
tion of "IMPROVEMENTS IN EVAPORATING AND CONCENTRATING SOLUTIONS OF
CAUSTIC SODA, POTASH, AND THEIR SALTS, AND LIQUORS OCCURING IN THE
ON ORATIO Å CID AND ALSO GELATINE.”
PROVISIONAL SPECIFICATION left by the said Richard Samuel Dale
and John Dale at the Office of the Commissioners of Patents, with
their Petition, on the 2nd October 1873.
We, RICHARD SAMUEL DALE and JOHN DALE, of Manchester, in the
County of Lancaster, Chemists, do hereby declare the nature of the said
Invention for "IMPROVEMENTS IN EVAPORATING AND CONCENTRATING SOLUTIONS
OF CAUSTIC SODA, POTASH, AND THEIR SALTS, ACID LIQUORS OCCURING IN THE
MANUFACTURE OF OXALIC ACID, AND ALSO GELATINE," to be as follows:-
In the manufacture of caustic soda, caustic potash, or mixtures of the
same, and other substances from the solutions of which salts are

page_text: deposited in their evaporation and concentration much wear and tear of
plant and loss of time is entailed by the process now usually carried on.
We use ordinary steam boilers or other suitable vessels from which
the steam produced in the evaporation shall be rapidly conducted away
by means of vacuum pumps or other suitable means for producing a
vacuum. These boilers may either be heated with fire or steam, but we
prefer the latter, and supply it by means of a series of tubes in connection
with a large steam chest placed inside the boiler or vessel used for the
evaporation.
The above mode of treatment we find especially applicable and
advantageous in the manufacture of oxalic acid where the solutions of
the acid require to be kept at a low temperature to provide against
decomposition, but in this case it is necessary that the process must bo
carried on in leaden vessels.
This process will also be found most advantageous in the manufacture
of glue and size (which it is absolutely requisite should be maintained
at a low temperature during concentration), as also in the evaporation
and concentration of the chlorides of sodium and potassium and other
salts of the same.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Richard Samuel Dale and John Dale in the Great
Seal Patent Office on the 2nd April 1874.
TO ALL TO WHOM THESE PRESENTS SHALL COME, we, RICHARD
SAMUEL DALE and JOHN DALE, of Manchester, in the County of
Lancaster, Chemists, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Second day of October, 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 and grant unto us, the said Richard Samuel Dale and John Dale,
Her special license that we, the said Richard Samuel Dale and John
Dale, our executors, administrators, and assigns, or such others as we,
the said Richard Samuel Dale and John Dale, our executors, adminis-
trators, and assigns, should at any time agree with, and no others, from

page_text: 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
AND CONCENTRATING SOLUTIONS OF CAUSTIC SODA, POTASH, AND THEIR SALTS, ACID
LIQUORS OCCURRING IN THE MANUFACTURE OF OXALIC ACID, AND ALSO GELATINE,"
upon the condition (amongst others) that we, the said Richard Samuel
Dale and John Dale, our executors or administrators, by an instrument
in writing under our, or their, or one of our or their hands and seals,
should particularly describe and ascertain the nature of the said Inven-
tion, 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 we, the said Richard Samuel Dale and John
Dale, 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) :—
In the manufacture of caustic soda, caustic potash, or mixtures of
the same, and other substances from the solutions of which salts are
deposited in their evaporation and concentration much wear and tear
of plant, and loss of time is entailed by the process now usually
carried on.
We use ordinary steam boilers or other suitable vessels from which
the steam produced in the evaporation shall be rapidly conducted away
by means of vacuum pumps or other suitable means for producing a
vacuum. These boilers may either be heated with fire or steam, but we
prefer the latter and supply it by means of a series of tubes in connection
with a large steam chest placed inside the boiler or vessel used for the
evaporation.
The above mode of treatment we find especially applicable and
advantageous in the manufacture of oxalic acid where the solutions of,
the acid require to be kept at a low temperature to provide against
decomposition, but in this case it is necessary that the process must be
carried on in leaden vessels.
This process will also be found most advantageous in the manufacturo
of glue and size (which it is absolutely requisite should be maintained

page_text: tubes connected with a steam chest which will allow of the condensed
water passing freely away.
Having now described the nature and particulars of our said Inven-
tion and the manner in which the same is to be performed, we desire it
to be understood that we claim the improvements in evaporating and
concentrating solutions of caustic soda, potash, and their salts, acid
liquors occurring in the manufacture of oxalic acid, and also gelatine as
herein described.
In witness whereof, I, the said John Dale, for and on behalf of
myself, and the said Richard Samuel Dale, have hereunto set
my hand and seal, this Twenty-seventh day of March, in the
year of our Lord One thousand eight hundred and seventy-
four.
Signed, sealed, and delivered by
the within-named John Dale,
in the presence of
G. SEPTIMUS HUGHES,
Patent Agent,
Manchester.
JOHN DALE. (L.s.)