Treating Tersulphides or Polysulphides of Barium and Strontium so as to Recover the Barium and Strontium and Obtain other Products.
Year: 1886

page_text: Date of Application, 5th Apr., 1886.
Complete Left, 5th Jan., 1887.
Complete Accepted, 8th Feb., 1887
PROVISIONAL SPECIFICATION.
Treating Tersulphides or Polysulphides of Barium and Strontium
so as to Recover the Barium and Strontium and Obtain other
Products.
I HUGH LEE PATTINSON, Junior, of Heworth Lodge, Felling on Tyne, in the
County of Durham, Chemical Works Manager, do hereby declare the nature of this
invention to be as follows:-
In the Specification of a former invention for which I obtained Letters Patent
dated 29th December 1884 No. 16,989 under the title of "Improvements in the
manufacture of hydrates of barium and strontium," I described a process in which a
residual liquor is obtained consisting of a solution of tersulphide or polysulphide of
barium or of strontium associated with a little hydrate of barium or of strontium.
My present invention consists in treating tersulphide or polysulphide of barium or
of strontium obtained according to the said process or otherwise so as to recover the
barium or strontium in an insoluble form and the sulphur in the form of sulphur
while the soda or other alkali used for the purpose of my invention can be recovered
in the form of hyposulphite.
I proceed as follows:-I take a solution of tersulphide or polysulphide of barium or
of strontium associated or not with a little hydrate of barium or of strontium and I
add as large a quantity of some alkaline salt as suffices to precipitate all the barium
or strontium in an insoluble form. I prefer for the purpose sulphate of soda which
yields sulphate of barium or strontium but any alkaline salt which, on mixture with
the tersulphide of barium or strontium, precipitates or allows to crystallize out the
barium or strontium will answer. After precipitating the barium or strontium the
soda (or other alkali) is left behind in the form of solution of tersulphide of soda
(or of other alkali). I separate the solution from the precipitate by decantation or
otherwise and I then add to the solution sulphurous acid gas whereby I produce
hyposulphite of soda (or of other alkali) while free sulphur of an amount equivalent to
about two-thirds of the total sulphur originally present in the solution is precipitated.
The solution of hyposulphite is then evaporated and allowed to crystallize.
From the foregoing description it will be seen that I obtain as products an insoluble
salt of barium or strontium, sulphur and an alkaline hyposulphite:
J. C. MEWBURN,
169, Fleet Street, London,
Agent.

page_text: COMPLETE SPECIFICATION.
Treating Tersulphides or Polysulphides of Barium and Strontium
so as to Recover the Barium and Strontium and Obtain other
Products.
I HUGH LEE PATTINSON Junior of Heworth Lodge, Felling on Tyne in the County
of Durham Chemical Works Manager 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 the Specification of a former invention for which I obtained Letters Patent
dated 29th December 1884 No. 16989 under the title of "Improvements in the
manufacture of hydrates of barium and strontium "I described a process in which a
residual liquor is obtained consisting of a solution of tersulphide or polysulphide of
barium or of strontium associated with a little hydrate of barium or of strontium.
My present invention consists in treating tersulphide or polysulphide of barium or
of strontium obtained according to the said process or otherwise so as to recover the
barium or strontium in an insoluble form and the sulphur in the form of sulphur
while the soda or other alkali used for the purpose of my invention can be recovered
in the form of hyposulphite.
I proceed as follows:—I take a solution of tersulphide or polysulphide of barium
or of strontium associated or not with a little hydrato of barium or of strontium and
I add as large a quantity of some alkaline salt as suffices to precipitate all the barium
or strontium in an insoluble form. I prefer for the purpose sulphate of soda which
yields sulphate of barium or strontium but any alkaline salt, which, on mixture with
the tersulphide of barium or strontium, precipitates or allows to crystallise out the
barium or strontium, will answer. After precipitating the barium or strontium the
soda (or other alkali) is left behind in the form of solution of tersulphide of soda
(or of other alkali). I separate the solution from the precipitate by decantation or
otherwise and I then add to the solution sulphurous acid gas whereby I produce
hyposulphite of soda (or of other alkali) while free sulphur of an amount equivalent
to about 3rds of the total sulphur originally present in the solution is precipitated.
The solution of hyposulphite is then evaporated and allowed to crystallize.
From the foregoing description it will be seen that I obtain as products an insoluble
salt of barium or strontium, sulphur and an alkaline hyposulphite.
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 treatment of tersulphides or polysulphides of barium or of strontium by

page_text: adding to a solution thereof sulphate of soda or other suitable alkaline salt whereby
the barium or strontium is precipitated in an insoluble form or allowed to crystallize
out as set forth.
2. The process hereinbefore described which consists in first effecting the precipitation
in an insoluble form or the crystallizing out of the barium or strontium in a solution
of tersulphide or polysulphide of barium or strontium by adding thereto sulphate of
soda or other suitable alkaline salt, in then separating from the precipitate or crystals
the resulting solution consisting of tersulphide of soda or other alkali and in then pro-
ducing an alkaline hyposulphite and a precipitate of free sulphur from this solution by
adding sulphurous acid gas thereto, all as set forth.
J. C. MEWBURN,
169, Fleet Street, London,
Agent.