IMPROVEMENTS IN UTILISING BYE-I'RODUCTS OF THE SODA and Potash MANUFACTURES
Year: 1876

page_text: LETTERS PATENT to James Mactcar, of Glasgow, in the County of Lanark,
North Britain, Chemist, for the Invention of "IMPROVEMENTS IN UTILISING
BYE-I'RODUCTS OF THE SODA and Potash MANUFACTURES.”
SORA
Sealed the 19th December 1870, and dated the 5th October 1876.
PROVISIONAL SPECIFICATION left by the said James Mactear at the Office
of the Commissioners of Patents on the 5th October 1876.
JAMES MACTEAR, of Glasgow, in the County of Lanark, North Britian, Chemist.
"IMPROVEMENTS IN UTILISING BYE-PRODUCTS OF THE SODA AND POTASH MANU-
FACTURES."
This Invention relates to a process described in the Specification of Letters
Patent obtained by the present applicant for his Invention of "Improvements in
Utilising Bye-products of the Soda and Potash Manufactures, and in Apparatus
therefor," and dated 8 September 1871, (No. 2374), and the present improvements
consist in using in the said process a solution containing a larger proportion of
sulphurous acid than the solution of that acid in simple water described as to be
used in the said earlier Specification.
The desired solution is obtained according to one modification by passing
sulphurous acid (SO2) through water containing lime, and thus forming bisulphite
of lime, otherwise known as a solution of sulphite of lime in sulphurous acid.
By another modification old oxidised waste or waste from which all or most of
the yellow liquor has been drained, and which waste contains lime compounds, is
mixed with water and sulphurous acid (SO) is passed into the mixture.
In either modification the presence of the line enables the solution to hold a
larger proportion of sulphurous acid than simple water, and the stronger solution
thus obtained is used with increased economy, convenience, and advantage in the
process in which it is applied.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said James Mactear in the Great Seal Patent Office on the 3rd April 1877.
JAMES MACTEAR, of Glasgow, in the County of Lanark, North Britian, Chemist.
"IMPROVEMENTS IN UTILISING BYE-PRODUCTS OF THE SODA AND POTASH MANU-
FACTURES."
12

page_text: My said Invention relates to a process described in the Specification of Letters
Patent granted to me for my Invention of "Improvements in Utilising Bye-products
of the Soda and Potash Manufactures, and in Apparatus therefor," and dated
8 September 1871 (No. 2374). In the process referred to a solution of sulphurous
acid is used, and my present improvements consist in using in the said process a
solution containing a larger proportion of sulphurous acid than the solution of that
acid in simple water described as to be used in my said earlier Specification.
In practically carrying out my present Invention according to one modification, I
form the desired stronger solution by passing sulphurous acid (SO) through or in
contact with water containing lime, and thus forming bisulphite of lime, otherwise
known as a solution of sulphite of lime in sulphurous acid.
By another modification alkali waste preferably in the oxidized state when all or
most of the yellow liquor has been drained from it, and which waste contains lime or
lime compounds, is mixed with water and sulphurous acid (SO.) is passed into or in
contact with the mixture.
In either modification the presence of the lime enables the solution to hold a
larger proportion of sulphurous acid than simple water, and the stronger solution
thus obtained is used with increased economy, convenience, and advantage, in the
process in which it is applied. Before use the solution however obtained is if
necessary separated from any insoluble matter.
The said process in which the stronger solution of sulphurous acid is to be used
may be conducted in the manner described in my earlier Specification herein-before
referred to, regard being had to the increased proportion of sulphurous acid, and to
the lime in the solution, that is to say, the quantities of the several liquids are
to be so proportioned as to yield chloride of calcium and sulphur as the final
products of decomposition.
Having thus particularly described my said Invention and the manner of
performing the same, I have to state that I do not claim the making of a solution of
bisulphite of line, but that what I believe to be novel and original and claim as
the Invention secured to me by the herein-before in part recited Letters Patent is,-
The application in the process for utilising bye-products of the soda and potash
manufacturers described in my earlier Specification herein-before referred to, of a
solution made to hold an increased proportion of sulphurous acid by means of lime
or by means of the lime or compounds thereof contained in alkali waste as herein-
before described.
In witness whereof, I, the said James Mactear, have hereunto set my hand
and seal, this Second day of April, in the year of our Lord One thousand
eight hundred and sevent.v-seven.
Witness,
EDMUND HUNT,
Patent Agent,
Glasgow.
JAMES MACTEAR. (L.S.)