IMPROVE- ALERT IN THE PREPARATION OF CARBONIC ACID AND AERATED WATERS
Year: 1881

page_text: LETTERS PATENT to John Williamson, of Westoe, South Shields, in the County
of Northumberland, Chemical Manufacturer, for an Invention of "IMPROVE-
LETTERS PATENT to John Williamson, of Westoe, South Shields, in the County
of Northumberland, Chemical Manufacturer, for an Invention of "IMPROVE-
ALERT IN THE PREPARATION OF CARBONIC ACID AND AERATED WATERS."
PROVISIONAL SPECIFICATION left by the said John Williamson at the
Office of the Commissioners of Patents on the 25th January 1881.
JOHN WILLIAMSON, of Westoe, South Shields, in the County of Northumberland,
Chemical Manufacturer. "IMPROVEMENTS IN THE PREPARATION OF CARBONIC
ACID AND AERATED WATERS."
This Invention has for its object improvements in the preparation of carbonic
acid and aerated waters.
At the present time when it is desired to prepare carbonic acid and aerated
waters by the use of dry chemicals it is customary to employ. tartaric acid; thus
this acid is now largely employed in the preparation of aerated water in
gasogenes.
The high price and limited supply of tartaric acid renders it very desirable to
produce a substitute for this acid suitable for use in the gasogene.
My Invention consists in the employment for this purpose of bisulphate or
supersulphate of soda, or of potash, which I substitute in suitable proportion for
tartaric acid and other dry acid materials now made use of in gasogene mixtures,
or otherwise, for the preparations of carbonic acid and aerated water.
The pro-
portions which I employ when making use of bisulphate of soda are 120 parts of
bisulphate of soda to 84 parts of bicarbonate of soda. This mixture when water
is added evolves the whole or practically the whole of its carbonic acid gas, and
leaves no solid residuum, the glauber salts produced remaining in solution in the
water employed in the operation.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said John Williamson in the Great Seal Patent Office on the
23rd July 1881.
JOHN WILLIAMSON, of Westoe, South Shields, in the County of Northumberland,
Chemical Manufacturer. "IMPROVEMENTS IN THE PREPARATION OF CARBONIC
ACID AND AERATED WATERS."
This Invention has for its object improvements in the preparation of carbonic
acid and aerated waters.
At the present time when it is desired to prepare carbonic acid and aerated
waters by the use of dry chemicals it is customary to employ tartaric acid; thus
this acid is now largely employed in the preparation of aerated water in
gasogenes.
The high price and limited supply of tartaric acid renders it very desirable to
produce a substitute for this acid suitable for use in the gasogene.
My Invention consists in the employment for this purpose of bisulphate or
supersulphate of soda or of potash, which I substitute in suitable proportion for
tartaric acid and other dry acid materials now made use of in gasogene mixtures
or otherwise for the preparation of carbonic acid and aerated water. The pro-
portions which I employ when making use of bisulphate of soda are 120 parts of
bisulphate of soda to 84 parts of bicarbonate of soda. These materials should be
finely powdered, and packed separately in papers containing the proper pro-
portional quantities as when tartaric acid and bicarbonate of soda are prepared
for use in the gasogene. This mixture when water is added evolves the whole or
practically the whole of its carbonic acid gas.
For use in the preparation of aerated waters on a manufacturing scale I make
a rough bisulphate of soda by decomposing common salt with two equivalents of
sulphuric acid. The operation is conducted in an iron pot and yields at once the
bisulphate required. It is packed in casks for transport. The carriage of this
material from place to place is much less costly than the carriage of liquid acid,
and the risks attendant on the transport of liquid acid are avoided. The aerated
water manufacturer employing this material, together with bicarbonate of soda,
obtains a pure carbonic acid gas and can dispense with the apparatus now required
for washing the gas.
What I claim is, the use for the production of carbonic acid gas and in the
manufacture of aerated water of bisulphate or supersulphate of soda and
bicarbonate of soda, substantially as described.
In witness whereof, I, the said John Williamson, have hereunto set my hand
and seal, this Twenty first day of July, in the year of our Lord One
thousand eight hundred and eighty one.