Improvements in the Manufacture of Chlorates, and of Magnesium Hydrate suitable for use therein.
Year: 1889

page_text: Date of Application, 16th Feb., 1889
Complete Specification Left, 15th Nov., 1889-Accepted 21st Dec., 1889
PROVISIONAL SPECIFICATION.
Improvements in the Manufacture of Chlorates, and of Magnesium
Hydrate suitable for use therein.
We, EDMUND KNOWLES MUSPRATT of Seaforth Hall near Liverpool in the
County of Lancaster, Chemist and GEORGE ESCHELLMANN Ph. D. of Northwich in
the County of Chester do hereby declare the nature of this Invention to be as
follows:-
This Invention relates to the employment of magnesium hydrate for the absorption
of Chlorine in the manufacture of Chlorates in the place of magnesia as described in
the Specifications of Patents Nos. 3960, 5168 and 5183 (all of 1883).
Hitherto the use of magnesia for this purpose, has presented difficulties as it does
not absorb the Chlorine readily and we have found in substituting magnesium hydrate
for magnesia the absorption of Chlorine is practically perfect.
In order to form magnesium hydrate suitable for this or other purpose from
magnesia or magnesium oxychloride or a mixture of the two we proceed as
follows.
It is a well known fact that magnesia more particularly magnesia obtained by
calcination of Carbonate Chlorate or other salts of magnesia cannot be converted
quickly or completely into magnesium hydrate by treating it with water as is the
case with burnt lime. In order to do this quickly and completely we mix magnesium
oxyde or oxychloride or a mixture of the two with a solution of Magnesium, Calcium
Strontium or Barium Chloride in water, or a mixture of any of these solutions in any
suitable vessel or apparatus which may be so arranged as to work intermittently or
continuously and is provided with a suitable agitator so as to bring the magnesia or
the like into intimate contact with the solution. The solution preferably is heated
to 80° centigrade but we do not confine ourselves to any particular temperature, but
we find that the hydration is accelerated considerably if the solution is used hot. We
also do not confine ourselves to any special strength of solution but we find that
from 5 to 10° Twaddle is enough for our purpose. After a certain time when the
hydration is completed the mixture of solution and magnesium hydrate is run off from
the vessel and the magnesium hydrate is separated from the solution by settling or by
means of a vacuum filter or filter-press or any other convenient method.
The magnesium hydrate after being washed with water to remove all traces of
solution adhering to it can be used either as such or after being dried in any suit-
able way.
If magnesium oxychloride or a mixture of magnesia and oxychloride or a mixture
of magnesia and magnesium oxychloride and magnesium chloride is to be converted
into magnesium hydrate these salts can be treated either with any of the solutions as
before described or with water which in decomposing the oxychloride or the like into
magnesia and magnesium chloride and dissolving the magnesium chloride, this
solution of magnesium chloride will convert the magnesia into hydrate if allowed to
react upon the magnesia as described.
The solutions can be used over and over again for converting fresh quantities of
magnesia and the like into hydrate.
Dated this 16th dev of February 1980
COMPLETE SPECIFICATION.
Improvements in the Manufacture of Chlorates, and of Magnesium
Hydrate suitable for use therein.
We, EDMUND KNOWLES MUSPRATT of Seaforth Hall near Liverpool in the
County of Lancaster Chemist and GEORGE ESCHELLMANN Ph. D. of Northwich in
DL23

page_text: the County of Chester 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 :-
This Invention relates to the employment of magnesium hydrate for the absorption
of chlorine in the manufacture of chlorates in the place of magnesia as described in
the Specification of Patents Nos. 3960 5168 and 5183 (all of 1883).
Hitherto the use of magnesia for this purpose has presented difficulties as it does
not absorb the chlorine readily and we have found in substituting magnesium hydrate
for magnesia the absorption of chlorine is practically perfect.
In order to form magnesium hydrate suitable for this or other purposes from
magnesia or magnesium oxychloride or a mixture of the two.
We proceed as
follows-It is a well known fact that magnesia more particularly magnesia obtained
by calcination of carbonate chloride or other salts of magnesium cannot be converted
quickly or completely into magnesium hydrate by treating it with water as is the
case with burnt lime. In order to do this quickly and completely we mix magnesium
oxyde or oxychloride or a mixture of the two with a solution of magnesium, calcium,
strontium or barium chloride in water or a mixture of any of these solutions in any
suitable vessel or apparatus which may be so arranged as to work intermittently or
continuously and is provided with a suitable. agitator so as to bring the magnesia or
the like into intimate contact with the solution. The solution preferably is heated
to 80° centigrade but we do not confine ourselves to any particular temperature but
we find that the hydration is accelerated considerably if the solution is used hot.
We also do not confine ourselves to any special strength of solution but we find
that from 5° to 10° Twaddle is enough for our purpose. After a certain time
when the hydration is completed the mixture of solution and magnesium hydrate
is run off from the vessel and the magnesium hydrate is separated from the solution
by settling or by means of a vacuum filter or filter press or any other convenient
method.
The magnesium hydrate after being washed with water to remove all traces of
solution adhering to it can be used either as such or after being dried in any suit-
able way.
If magnesium oxychloride or a mixture of magnesia and oxychloride or a mixture
of magnesia and magnesium oxychloride and magnesium chloride is to be converted
into magnesium hydrate, these salts can he treated either with any of the solutions as
before described or with water which in decomposing the oxychloride or the like into
magnesia and magnesium chloride and dissolving the magnesium chloride this solution
of magnesium chloride will convert the magnesia into hydrate if allowed to react upon
the magnesia as described.
The solutions can be used over and over again for converting fresh quantities of
magnesia into hydrate.
Having now particularly described and ascertained the nature of this Inven-
tion and in what manner the same is to be performed we declare that what we
claim is
1. The use of magnesium hydrate for the absorption of chlorine in the manufacture
of chlorates substantially as hereinbefore described.
2. The manufacture of magnesium hydrate from magnesia or magnesium oxychloride
or a mixture of them by treatment with solutions of either magnesium, calcium,
strontium, or barium chloride or of mixtures of two or more of such solutions.
1711
No 1980
J. H. JOHNSON & Co.,
Agents.