Improvements in Treating Solutions of Chloride of Calcium so as to Obtain Chloride of Magnesium and other Products.
Year: 1886

page_text: Date of Application, 27th Nov, 1886.
Complete Left, 26th Aug., 1887.
Complete Accepted, 14th Oct., 1887
Improvements in Treating Solutions of Chloride of Calcium so as
to Obtain Chloride of Magnesium and other Products.
We, WILLIAM BRAMLEY of 18 Clarence Street Middlesbro'-on-Tees, Analytical
Chemist and WILLIAM PERCY COCHRANE of 3 Belmont Terrace, Coatham, Redear,
Yorks, Secretary do hereby declare the nature of this invention to be as follows:-
In many manufacturing operations solutions of chloride of calcium or mixed
solutions of chloride of calcium and chloride of magnesium are obtained as by products
and are generally run to waste. The object of this invention is to obtain chloride of
magnesium from solutions containing chloride of calcium by means of hydrated
carbonate of magnesia and carbonic acid gas, and at the same time to obtain as
carbonate of lime the calcium of the said solutions.
To the solution containing the chloride of calcium we add hydrated carbonate of
magnesia, obtained as hereinafter stated, and carbonic acid gas is injected.
Carbonate of lime will be precipitated and chloride of magnesium obtained in
solution. The solution after being seperated from the precipitate may be treated by
known methods for the obtainment of magnesia and hydrochloric acid, or magnesia
hydrochloric acid and free chlorine; or utilized in other ways.
The precipitated carbonate of lime may be utilized for the decomposition of
ammonium chloride or other purposes.
The hydrated carbonate of magnesia for the treatment of solutions of chloride of
calcium or mixed solutions of chloride of calcium and chloride of magnesium is
obtained by treating an alkaline bicarbonate with magnesia. To a solution of an
alkaline bicarbonate magnesia is added and the mixture heated and agitated.
ID 77
A

page_text: precipitate of hydrated carbonate of magnesia or mixture of hydrated carbonate and
hydrate of magnesia is obtained and the alkaline bicarbonate is reduced to mono-
carbonate. The operation is best performed by heating the mixture in a closed
vessel by so doing the solution of alkaline bicarbonate is more readily decomposed.
If an excess of the latter be used a precipitate will be obtained containing a smaller
admixture of hydrate of magnesia. Any bicarbonate remaining in the solution after
treatment may be decomposed by a second treatment with magnesia; this precipitate
being used for treating a fresh quantity of alkaline bicarbonate.
Dated this 26th day of November 1886.
WILLIAM BRAMLEY.
WM. P. COCHRANE.

page_text: to Obtain Chloride of Magnesium and other Products.
WILLIAM BRAMLEY, 18 Clarence Street, Middlesbrough-on-Tees, Analytical
Chemist, and WILLIAM PERCY COCHRANE, Holmhurst, Middlesbrough on Tees,
Secretary do hereby declare the nature of this invention and in what manner the same
is to be performed, to be particularly described and ascertained in and by the
following statement:
In many manufacturing operations solutions of chloride of calcium or mixed
solutions of chloride of calcium and chloride of magnesium are obtained as bye products,
and are generally run to waste. The purpose of this invention is to obtain as chloride
of magnesium the chlorine existing as chloride of calcium by treating the solution
with hydrated carbonate of magnesia and carbonic acid gas.
We prefer to carry out the operation in a series of closed vessels, into which the
hydrated carbonate of magnesia is charged, whilst the solution containing the
chloride of calcium is run through the vessels, passing from one to the other,
Carbonic acid gas being at the same time injected into the mixture.
Chloride of magnesium is gradually formed in solution, which runs out of the
last vessel of the series (the last one charged with Hydrated Carbonate of Magnesia)
and carbonate of lime is precipitated.
When the hydrated carbonate of magnesia in the first vessel has become decomposed,
the precipitate, which will consist of carbonate of lime, is discharged and the vessel,
after being recharged with hydrated carbonate of magnesia, becomes the last vessel
of the series.
The operation may also be performed in a single vessel, and the liquor drawn off,
when similar results will be obtained.
The solution of magnesium chloride thus obtained may be treated by known methods
for the obtainment of Hydrochloric Acid, Chlorine, and Magnesia, or Hydrochloric
Acid and Magnesia, or utilized in other ways. The precipitated carbonate of lime
may be utilized for the decomposition of ammonium chloride, and formation of
ammonium carbonate. The hydrated carbonate of magnesia requisite for this process
is best obtained by treating an alkaline bicarbonate with magnesia, as set forth and
particularly described in a previous specification No. 13762, A.D. 1886.
To a solution of an alkaline bicarbonate magnesia is added, and the mixture
heated and agitated-A precipitate of hydrated carbonate of magnesia, or mixture
of hydrated carbonate and hydrate of magnesia is obtained, and the alkaline bicarbonate

page_text: is reduced to monocarbonate.
The operation is best performed by heating the
mixture in a closed vessel. By so doing the solution of alkaline bicarbonate is more
readily decomposed. If an excess of the latter be used, a precipitate will be obtained
containing a smaller admixture of hydrate of magnesia. Any bicarbonate remaining
in the solution after treatment may be decomposed by a second treatment with
magnesia.
Having now particularly described and ascertained the nature of our said invention,
and in what manner the same is to be performed, we declare that what we claim is
The treatment of a solution of Calcium Chloride, or a mixed solution of Calcium
Chloride and Magnesium Chloride with Hydrated Carbonate of Magnesia &
Carbonic acid gas in such a manner as to produce a solution of Magnesium Chloride
and a precipitate of Calcium Carbonate, substantially as herein described.
Dated this ou
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