AN IMPROVED METHOD OF PRODUCING 'CARBONATE OR OXIDE OR HYPOSULPHITE OF STRONTIUM OR OF to be as follows:- BARIUM, AND RECOVERING BYE PRODUCTS THEREFROM.
Year: 1884

page_text: I, EUGÈNE FRANÇOIS TRACHSEL, of 45, Miranda Road, in the County of Middlesex,
Chemist, do hereby declare the nature of my invention for "AN IMPROVED METHOD
OF PRODUCING 'CARBONATE OR OXIDE OR HYPOSULPHITE OF STRONTIUM OR OF
to be as follows:-
BARIUM, AND RECOVERING BYE PRODUCTS THEREFROM
.
According to my invention I treat solutions of the sulphides, hydrosulphides or
compound sulphides of strontium or of barium with a solution of carbonate of.
sodium or potassium.
I thus obtain carbonate of strontium or of barium as a deposit, which after.
washing and drying, is ready for use or sale, and the corresponding sulphide,
hydrosulphide, or compound sulphide of sodium or potassium.
'
This sulphide, hydrosulphide or compound sulphide of sodium or potassium
I convert into hyposulphite of sodium or potassium by the well known treatment
with sulphurous acid, that is to say, by passing through the solution sulphurous
acid gas, or by mixing the solution of the sulphide with a solution of sulphurous
acid. I prefer, however, the treatment with sulphurous acid gas.
I thus obtain hyposulphite of sodium or potassium in solution and sulphuretted,
hydrogen gas.
According to my invention I now convert. this sulphuretted hydrogen into
sulphurous acid, by passing it, mixed with air, through a red bot pipe, or by any
other means, and force or, draw this sulphurous acid through a second quantity of
sulphides or sodium or potassium.
This second quantity of the sulphides is thus converted into hyposulphite of
sodium or potassium giving off sulphuretted hydrogen again, which I convert into
sulphurous acid as above described and pass through a third quantity of sulphide
liquor, repeating this operation, viz:-the conversion of the sulphide into hypo-
sulphite and the transformation and utilization of the generated sulphuretted
hydrogen, until the sulphuretted hydrogen becomes so diluted with the nitrogen
of the air, that it cannot practically be converted into sulphurous acid.
By the above described process I can convert a very large quantity of sulphide,
hydrosulphide or compound sulphide of sodium or potassium at the same time by
using a comparatively small quantity of sulphurous acid at the commencement.

page_text: The byposulphite of sodium or potassium obtained I boil down to crystallization
and make ready for sale, or I convert it into carbonate of sodium or potassium by
the "Leblanc" process, or any other process, so that I can use it again for
precipitating carbonate of strontium or of barium.
Or else I reverse the above described operations so that I first make hyposulphite
of strontium or of barium, and treat this hyposulphite with carbonate of sodium or
potassium, or, if desired, with caustic soda or potash, that is to say -I treat the
solutions of sulphides, hydrosulphides or compound sulphides of strontium or of
barium, with sulphurous acid either as gas or in solution, and I obtain a solution
of the corresponding hyposulphite. VAT
T
This reaction may, in the case of hydrosulphide of strontium, be represented by
the following equation.
2 Sr S.H, S + 3 SO₂: = 2 Sr S₂ O, + 2 HL₂ S + S.
A secondary reaction taking place in the meantime, which is represented by the
following equation, viz:→
•
.0
Sr S.H, S + SO.+ H₂O = Sr SO, + 2 H, S.
G-
The sulphuretted hydrogen thus generated mixed with the necessary quantity
of air is converted into sulphurous acid by passing the mixture through a red hot
pipe or by other suitable means: This reaction being represented by the equation,
H₁₂S + 30 SO₂ + H₂ O.
=
The sulphurous acid thus produced is passed through another quantity of
sulphide, hydrosulphide or compound sulphide, of strontium or of barium,
decomposing it and generating sulphuretted hydrogen, which I mix again with
air and change into sulphurous acid. This sulphurous acid can then be forced or
drawn through a third quantity of sulphide liquor, decomposing.it and generating.
sulphuretted hydrogen, and in this manner the process can be repeated until the
gases become too much diluted by the nitrogen of the air.
I can thus convert a very large quantity of liquor in a short time by using
comparatively small quantity of sulphurous acid at the commencement..
a
The sulphur generated in the above described process settles down in the liquor
together with the sulphite of strontium or of barium and is separated from "the
sulphite by heating the dried precipitate, whereby, if the air is excluded, the
-sulphur-passes-away-in-vapour-and-is-collected, and, if air is admitted, sulphurous
acid is formed, which can be used for converting in the above described process.
The remaining sulphite is so treated as to produce sulphide again, or other.
compounds of strontium or of barium.
The byposulphite of strontium or of, barium formed in the above described
process is either evaporated to crystallization or treated with caustic soda or potash
or carbonate of sodium or potassium, whereby I obtain hydrate or carbonate of
strontium or of barium and lyposulphite of sodium or potassium ás a bye product.
Dated this 17th day of Tuna' 1001.

page_text: I, EUGENE FRANÇOIS TRACHSEL, of 45 Miranda Road, Holloway, in the County
of Middlesex, Chemist, do hereby declare the nature of my invention for "AN
IMPROVED METHOD OF PRODUCING CARBONATE OR OXIDE OR HYPO-SULPHITE OF
and
STRONTIUM OR OF, BARIUM, AND, RECOVERING BYE-PRODUCTS THEREFROM",
in what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement :-
My invention relates to the production of compounds of strontium and of barium
and other substances, and comprises the treatment as hereinafter specified of certain
sulphides, under which term I include mono-sulphides, bi-sulphides and other
compounds of sulphur with strontium or other substances specified.
According to my invention I treat sulphide of strontium solution, or sulphide of
barium solution, with carbonate of sodium solution or carbonate of potassium.
solution. I thus obtain carbonate of strontium or of barium as a deposit, which,
after being washed and dried, is ready for use or sale; and I also obtain the
corresponding sulphide of sodium or of potassium.
I convert this sulphide of sodium or of potassium into the corresponding
hyposulphite by the well-known treatment with anhydrous sulphurous acid or
sulphur di-oxide (SO), that is to say, by passing through the solution sulphur
di-oxide gas, or by mixing the solution of the sulphide with a solution of sulphurous
acid.
I thus obtain byposulphite of sodium or of potassium in solution, and (if
bi-sulphides or polysulphides are treated) sulphuretted hydrogen gas..
I convert this sulphuretted hydrogen into sulphur di-oxide by passing it, mixed
with air, through a red-hot pipe, or by other means, and I force or draw this
sulphur di-oxide through a second quantity of sulphide of sodium or of potassium.
This second quantity of sulphide is thus converted into hyposulphite of sodium or
of potassium, giving off again. sulphuretted hydrogen gas, which I convert into
-sulphur di-oxide as above described and pass through a third quantity of sulphide
liquor, repeating this operation, that is to say, the conversion of the sulphide into
hyposulphite and the transformation and utilization of the sulphuretted hydrogen
generated in the process, until the sulphuretted hydrogen becomes so diluted with
the nitrogen of the air that its further conversion into sulphur di-oxide is>
impracticable.
By the above described process, I can convert a very large quantity of sulphide,
bi-sulphide or other compound of sulphur and sodium or potassium.at one and the
same time, into the corresponding hyposulphite.
I boil down to crystallization the hyposulphite of sodium. or of potassium
obtained as above described, and I may then sell it. Or I convert it into carbonate
of sodium or of potassium by the well-known "Leblanc" process, or other suitable

page_text: process, so that I can use it again for precipitating carbonate of strontium or of
barium.
I can reverse the above described operations by first making hyposulphite of
strontium or of barium and then treating the hyposulphite' with carbonate of
sodium or of potassium or with caustic soda or potash, that is to say, I treat
a solution of sulphide of strontium or of barium with sulphur di-oxide, either in
the condition gas or in solution, and I obtain a solution of the corresponding.
byposulphite. This re-action may (in the case of sulph-hydrate of strontium) be
represented by the following equation.
сопать of gas or in solution, and I obtain a sonition of the corresponun
byposulphite. This re-action may (in the case of sulph-hydrate of strontium) be
represented by the following equation.
2 Sr S.Hg S + 3 SO₂ = 2 Sr S₂ O₂ + 2 H₂ S + S.
3
a secondary re-action taking place in the meantime, which is represented by the
following equation, viz:―
Sr S.H, S + SO2 + H₂ O
=
Sr SO, + 2 H2 S.
The sulphuretted hydrogen so generated mixed with the necessary quantity of
air is converted into sulphur di-oxide by passing the mixture through a red-hot
pipe, or by other suitable means. This re-action being represented by the following
equation.
H₂SO, SO₂ + H₂
=
0.
The sulphur di-oxide so produced is passed through another quantity of sulphide
for decomposing it and generating sulphuretted.hydrogen, which I again mix with
air and convert into sulphur-di-oxide.
This sulphur di-oxide can then be forced or drawn. through a third quantity of
sulphide liquor for decomposing it and generating sulphuretted hydrogen, and, in
this way, the process can be repeated until the gases become too much diluted by
the nitrogen of the air.
I can thus treat a very large quantity of liquor in a short time with a
comparatively small quantity of sulphur di-oxide for the commencement of the
process.
The sulphur generated in the above described process settles down in the liquor
together with the sulphite of strontium or of barium, and is separated from the
sulphite by heating the dried precipitate.
If,-at-this-stage-of-the-process, air-is-excluded, the sulphur passes away in vapour
and is collected, and, if air, is admitted, sulphur di-oxide is formed, which can be
used as, and for the purpose, above specified:
The remaining sulphite is treated to reproduce sulphide or other compounds of
strontium or of barium.
The hyposulphite of strontium or of barium formed in the above described
process is either evaporated to crystallization or treated with caustic soda or
potash or carbonate of sodium or of potassium, I thus obtain hydrate or carbonate.
of strontium or of barium and hyposulphite of sodium or of potassium.
•
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
First. The simultaneous production of carbonate of strontium or carbonate of
barium and sulphide of sodium or sulphide of potassium, as above.described.
Second. The production of carbonate of strontium or of barium and hyposulphites
of the alkalies, as 'above described.
Third. The simultaneous production of the hyposulphites and sulphites of
strontium or of barium by the action of sulphur di-oxide on their sulphides, as
above described.
.
3.
Fourth. The production of carbonate or hydrate of strontium or of barium and
of hyposulphites of the alkalies by treating the hyposulphites of strontium or Iof
barium obtained by the above process with caustic soda or potash or with carbonate,
of sodium or of potassium, as above described.
J

page_text: Fifth. The reproduction or recovery of sulphur dioxide from sulphuretted.
hydrogen that has been given off from the sulphur di-oxide in the previous use of
the same, as above set forth.