AN IMPROVED METHOD OR PROCESS OF PRODUCING OXIDE OF STRONTIUM OR OF BARIUM
Year: 1884

page_text: I EUGÈNE FRANCOIS TRACHSEL of 45 Miranda Road, in the County of Mid-
dlesex, Chemist, do hereby declare the nature of said invention for "AN IMPROVED
METHOD OR PROCESS OF PRODUCING OXIDE OF STRONTIUM OR OF BARIUM," to be
as follows:-
My invention relates to the production of oxide and carbonate of strontium of
barium or of calcium by the following method or process, that is to say, I first
treat the sulphate of strontium of barium or of calcium to reduce the same to a
sulphide.
This part of my process is effected in the ordinary manner by submitting the
sulpbate either alone or mixed with carbonaceous matter to a reducing flame, or
treating the same in a vessel or furnace heated externally, until it is almost
completely converted into sulphide. This dry sulphide when dissolved by boiling
with water and allowed to cool gives about one half of the sulphide as hydrato
crystals, and the remainder as bydrosulphide or bisulphide-liquor.
According to my invention I take the sulphide thus produced either alone or
mixed with carbonaceous or other materials which will act as carriers of oxygen
temporarily or will keep the sulphide open for the action of oxygen, or will act
under such circumstances as absorbants of sulphur, and, either in the same furnace,
or in any other suitable apparatus, expose it to an oxidizing flame, or to a sufficient
degree of heat in the presence of air. By this operation the sulphide is almost
entirely changed into oxide by driving off the sulphur, which escapes as sulphurous
acid, and when the oxide is dissolved by boiling with water and allowed to cool
almost the entire quantity crystalizes into hydrate.
Or I take Bilsulphide, Oxysulphide, or other sulphide of Strontium, of Barium,
or of Calcium produced by any process either alone, or mixed with carbonaceous
or other material, which will act as a carrier of oxygen or will keep the sulphide
open for the action of oxygen or will act under such circumstances as an absorbent
of sulphur, and by exposing the same to an oxydizing flame or to heat in the
presence of air as before described, convert it into oxide of Strontium of Barium or
of Calcium,
By my process nearly the whole of the sulphide or compound sulphide is
converted into oxide. In the case of Strontium and Barium the oxide can be

page_text: obtained in a pure state by dissolving and crystallizing it. Or the oxide may
be converted into carbonate by subjecting the dissolved oxide to the action of
carbonic acid.
Or the oxide of Strontium or of Barium in solution may be treated with soluble
carbonate of an alkali such as Soda, Potash or Ammonia, when I obtain Carbonate
of Strontium or of Barium and Caustic Soda, Potash or Ammonia.
The caustic alkali produced can either be heated by the usual process of
evaporation and sold, or the solution may be treated with carbonic acid to convert
it into carbonate which can readily be prepared for using with a new quantity of
Strontium or Barium, by which means I can repeatedly use the same quantity of
Boda.
HASELTINE, LAKE & Co.,
For the Applicant.

page_text: I, EUGÈNE 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 OR PROCESS OF PRODUCING OXIDE OF STRONTIUM OR OF
BARIUM," and 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 oxide of strontium or of barium by
the following method or process, that is to say, I first treat the sulphate of strontium
or of barium to reduce the same to a sulphide.
:
This part of my process is effected in the ordinary manner by submitting the
sulphate of strontium or of barium, either alone or mixed with carbonaceous matter,
to a reducing flame, or by treating the sulphate, mixed with coal, in an externally
heated vessel or furnace, until it is almost completely converted into sulphide.
I then take the sulphide thus produced, either alone or mixed with carbonaceous
or other materials which will act temporarily as carriers of 'oxygen; or as absorbents
of sulphur, such as oxide of iron or metallic iron, and I expose the sulphide or
mixture, either in the aforesaid furnace or in any other suitable apparatus, to a
gentle oxidizing flame, or to a dark red heat in a muffle furnace in the presence
of air.
When the product obtained by the above treatment is dissolved by boiling with
water, and is allowed to cool, almost the entire quantity crystallizes into hydrate,
and can be purified by re-crystallization.
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
The production of oxide of strontium or of barium by the method or process
above described.