Improvements in the Manufacture of Chlorate of Soda.
Year: 1890

page_text: Date of Application, 16th Oct., 1890
Complete Specification Left, 7th July, 1891-Accepted, 15th Aug., 1891
PROVISIONAL SPECIFICATION.
Improvements in the Manufacture of Chlorate of Soda.
I DAVID GAMBLE of St. Helens Lancashire Manufacturing Chemist do hereby
declare the nature of this invention which has been communicated to me from
abroad by Alfred Rangod Pechiney of Salindres in the Republic of France
Manufacturing Chemist to be as follows:-
66
A known process employed for making chlorate of soda consists (as described in
the Specification to Letters Patent granted to Walter Weldon dated as of
1st of February 1881 No. 424) of two operations namely; first preparing a solution
of chlorate of lime and of chloride of calcium which is known as octagon liquor"
by the reaction of chlorine gas upon milk of lime and secondly treating this liquor
with a sufficient quantity of sulphate of soda to precipitate all the lime in the
state of sulphate. The liquor separated from this precipitate is a solution of
chlorate of soda and chloride of sodium.
The object of this invention is to simplify the said known process and consists
essentially in obtaining a solution of chlorate of soda and chloride of sodium by a
single operation which may be performed in a similar manner and in the same
vessels as in the known process for causing the reaction of chlorine on milk of lime
alone. According to this invention there is added to the milk of lime on which
the chlorine gas acts sulphate of soda by preference in the solid form and in
quantity equivalent to the lime whereby chlorate of lime and chloride of calcium
as they are produced are transformed into a solution of chlorate of soda and
chloride of sodium and a precipitate consisting of sulphate of lime.
When all the lime present has been acted on by the chlorine the action of the
chlorine is suspended and it only remains to separate from the liquid the sulphate
of lime to obtain the solution of chlorate of soda and chloride of sodium.
By this manner of proceeding a sodic solution is obtained of a much greater
degree of concentration than by the process at present in use and which may be
increased more or less according to the quantity of lime and sulphate of soda
added to the liquor. It is however desirable that the quantity of lime and of
sulphate of soda contained in the liquor should not be so great as to prevent the
chloride of sodium which is formed during the action of the chlorine remaining
dissolved in the liquid.
The mixed solution of chlorate of soda and chloride of sodium may be treated
in the usual manner to obtain crystallized chlorate of soda.
Dated this 16th day of October 1890.
J. H. JOHNSON & Co.,
47, Lincoln's Inn Fields, London, W.C.
COMPLETE SPECIFICATION.
Improvements in the Manufacture of Chlorate of Soda.
I DAVID GAMBLE of St. Helens, Lancashire, Manufacturing Chemist, do
hereby declare the nature of this invention which has been communicated to me
from abroad by Alfred Rangod Pechiney of Salindres in the Republic of France,
Manufacturing Chemist, and in what manner the same is to be performed to be
particularly described and ascertained in and by the following statement :-
A known process employed for making chlorate of soda consists (as described in
the Specification of Letters Patent granted to Walter Weldon dated as of
1st February 1881 No. 424) of two operations namely first preparing a solution of
Dd

page_text: chlorate of lime and of chloride of calcium which is known as "octagon liquor
by the reaction of chlorine gas upon milk of lime, and secondly treating this liquor
with a sufficient quantity of sulphate of soda to precipitate all the lime in the state
of sulphate. The liquor separated from this precipitate is a solution of chlorate of
soda and chloride of sodium.
The object of this invention is to provide a process simpler than the said known
process and consists essentially in obtaining a solution of chlorate of soda and
chloride of sodium by a single operation which may be performed in a similar
manner and in the same vessels as in the known process for causing the reaction of
chlorine on milk of lime alone. According to this invention there is added to the
milk of lime on which the chlorine gas acts, sulphate of soda by preference in the
solid form and in quantity equivalent to the lime whereby chlorate of lime and
chloride of calcium as they are produced are transformed into a solution of chlorate
of soda and chloride of sodium and a precipitate consisting of sulphate of lime.
When all the lime present has been acted on by the chlorine the action of the
chlorine is suspended and it only remains to separate from the liquid the sulphate
of lime to obtain the solution of chlorate of soda and chloride of sodium.
By this manner of proceeding a sodic solution is obtained which is of a much
higher degree of concentration than that obtained by the process at present in use
and which may be raised more or less according to the quantity of lime and
sulphate of soda added to the liquor. It is however desirable that the quantity of
lime and of sulphate of soda contained in the liquor should not be so great as to
prevent the chloride of sodium, which is formed during the action of the chlorine,
remaining dissolved in the liquid.
The mixed solution of chlorate of soda and chloride of sodium may be treated
in the usual manner to obtain crystallized chlorate of soda.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
In the manufacture of chlorate of soda the production of a compound solution
of chlorate of soda and chloride of sodium in one operation by causing chlorine to
react upon milk of lime in the presence of sulphate of soda substantially as herein-
before described.
Dated BILAS
Today
1001.
DAVID GAMBLE.
J. H. Johnson & Co.,
47, Lincoln's Inn Fields, W.C.; Agents.
DAVID GAMBLE.
J. H. Johnson & Co.,
47, Lincoln's Inn Fields, W.C., Agents.