AN IMPROVEMENT IN THE STRONTIA. TREATMENT SACCHARINE LIQUORS, AND APPARATUS FOR THAT PURPOSE
Year: 1884

page_text: I, JOHN IMRAY of No 28 Southampton Buildings Chancery Lane, in the county
of Middlesex, Consulting Engineer and Patent Agent, do hereby declare the nature
of my invention for " AN IMPROVEMENT IN THE STRONTIA. TREATMENT
SACCHARINE LIQUORS, AND APPARATUS FOR THAT PURPOSE" to be as follows:-
OF
In a provisional Specification filed by me on the 26th September 1883, of an
invention communicated to me from abroad by Hippolyte Leplay, I described the
application of monohydrate of strontia to the treatment of saccharine liquors. In
a provisional Specification filed by me this day of an invention also communicated
to me from abroad by the said Hippolyte Leplay, I describe a process for converting
carbonate of strontia into anhydrous strontia. The present invention relates to
the production of monohydrate of strontia for the treatment of saccharine liquors,
and to apparatus in which that treatment is effected. When anhydrous strontia
is applied directly to saccharine liquors, the heat developed is so great that the
operation is virtually impracticable. According to this invention, anhydrous
strontia is mixed with moist hydrate of strontia, whereby there is also a
considerable development of heat which drives off much of the water, so that the
mixture ultimately constitutes a monohydrate or low hydrate of strontia, which is
conveniently applicable to the treatment of saccharine liquors. The apparatus in
which this treatment is effected consists of a strong closed vessel, having a little
above its bottom a finely perforated screen, and having. suspended or supported
near the middle of its height a grating. Suitable valves, stop cocks, safety valves
and gauges, sight holes and manholes are provided for operating in the following
manner. The lower part of the vessel is charged with the saccharine liquor to be
treated, and monohydrate of strontia, which may be that prepared as above
described, is placed on the grating. Steam is blown into the liquor, heating and
agitating it, so that it takes up the strontia hydrate, forming sucrate of strontia.
This part of the operation may be carried on under considerable pressure, as at
high temperatures there is more complete precipitation of the sucrate. When the
reaction is complete, the contents are allowed to settle, and cocks are opened,
making communication between the upper and the lower parts of the vessel, so as
to establish equilibrium of pressure above and below the precipitate of sucrate.

page_text: Cocks are then opened, and the liquid portion of the contents is discharged, the
sucrate remaining deposited upon the screen, in which position it may be washed
by sending through it successive charges of boiling water which may have
admixture of strontia hydrate to prevent solution of the sucrate during the washing.
The sucrate is then dried by blowing steam through it, and raked out by a lateral
manhole to be carbonated and otherwise treated in the usual way.
It is advisable to use excess of strontia, which excess remains dissolved in the liquid
run off. This is recovered by cooling and concentration in the form of crystallised
hydrate, which is, as above described, mixed with the anhydrous strontia to
produce the monohydrate or low hydrate used in subsequent operations.

page_text: I, JOHN IMRAY of N° 28 Southampton Buildings Chancery Lane in the County
of Middlesex, Consulting Engineer and Patent Agent do hereby declare the nature
of my invention for "AN IMPROVEMENT IN THE STRONTIA TREATMENT OF
SACCHARINE LIQUORS AND APPARATUS FOR THAT PURPOSE" and in what manner
the same is to be performed to be particularly described and ascertained in and by
the following statement:-
In a Provisional Specification filed by me on the 26th September 1883, of an
invention communicated to me from abroad by Hippolyte Leplay, I described the
application of monohydrate of strontia to the treatment of saccharine liquors. In
the Specification No 1998 of 1884 filed by me this day, of an invention also
communicated to me from abroad by the said Hippolyte Leplay, I describe a
process for converting carbonate of strontia into anhydrous strontia. The present
invention relates to the production of monohydrate of strontia for the treatment
of saccharine liquors, and to apparatus in which that treatment is effected. When
anhydrous strontia is applied directly to saccharine liquors, the heat developed is
so great that the operation is virtually impracticable. According to this invention,
anhydrous strontia is mixed with moist hydrate of strontia, whereby there is also
a considerable development of heat, which drives off much of the water, so that the
mixture ultimately constitutes a monohydrate or low hydrate of strontia, which is
conveniently applicable to the treatment of saccharine liquors. The apparatus in
which this treatment is effected consists of a strong closed vessel, having a little
above its bottom a finely perforated screen, and having suspended or supported
near the middle of its height, a grating. Suitable valves, stop cocks, safety valves
and gauges, sight holes and manholes are provided for operating in the following
manner. The lower part of the vessel is charged with the saccharine liquor to be
treated, and monohydrate of strontia, which may be that prepared as above
described, is placed on the grating. Steam is blown into the liquor, heating and
agitating it so that it takes up the strontia hydrate, forming sucrate of strontia.
This part of the operation may be carried on under a pressure of one to two
atmospheres above the external pressure, as at a temperature above boiling point
there is more complete precipitation of the sucrate. When the reaction is complete,
the contents are allowed to settle, and cocks are opened, making communication
between the upper and the lower parts of the vessel, so as to establish equilibrium
of pressure above. and below the precipitate of sucrate. Cocks are then opened,
and the liquid portion of the contents is discharged, the sucrate remaining
deposited upon the screen, in which position it may be washed by sending through
it successive charges of boiling water, which may have admixture of strontia
hydrate in solution to prevent solution of the sucrate during the washing. The
sucrate is then dried by blowing steam through it, and raked out by a lateral
manhole, to be carbonated and farther treated in the usual way. It is advisable
to use excess of strontia, which excess remains dissolved in the liquid run off.
This is recovered by cooling and concentration, in the form of crystallised hydrate,
which is, as above described, mixed with the anhydrous strontia to produce the
monohydrate or low hydrate used in subsequent operations,

page_text: Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is:-
1. The herein described method of preparing a low hydrate of strontia for
treatment of saccharine liquors by mixing moist hydrate with anhydrous strontia.
2. The herein described arrangement of apparatus for strontia treatment of
saccharine liquors.