Improvements in the Manufacture or Production of Alkaline Silicates, or Silicates of the Alkaline Earths, and of Chlorine or Hydrochloric Acid.
Year: 1895

page_text: Date of Application, 19th Nov., 1895
Complete Specification Left, 24th July, 1896-Accepted, 19th Sept., 1896
Improvements in the Manufacture or Production of Alkaline
Silicates, or Silicates of the Alkaline Earths, and of Chlorine
or Hydrochloric Acid.
I, DMITRY ALEXANDROWITCH PÉNIAKOFF, of Rue Bauduin Pièrre Huy in
the Kingdom of Belgium, Chemist, do hereby declare the nature of this invention
to be as follows:-
In the Specification of Letters Patent No. 20604 of 1893, I have described a
process for obtaining aluminates by treating aluminous earths, containing very
small quantities of silica with alkaline sulphates, under the influence of alkaline
sulphides, or of pyrites. I have discovered that silica behaves in a manner quite
analogous to that of the aluminous earths. The reaction produced with the
corresponding salt of sodium for instance is as follows:
The materials to be employed should be in an anhydrous condition, and consist
of silica, (or the corresponding quantity of a silicate) alkaline sulphide, or a
sulphide of an alkaline earth, and alkaline sulphate, or a sulphate of an alkaline
earth, in proportions according to the foregoing formula. These are thoroughly
mixed together and the mixture is subjected whilst air is excluded, to a high
temperature.
Instead of preparing separately the alkaline sulphide or sulphide of alkaline
earth employed in the above re-action 1 may add to the silica and the sulphate
powdered carbon in the required proportion, so as to reduce in the mixture itself a
fourth part of the sulphate employed to sulphide, and a similar re-action will then
take place with the evolution of carbonic acid gas, as shewn for example as
follows:
4 SiO, +4 Na₂SO₁ + 2 C = 4 Na,SiO, + 4 SO, + 2 CO,.
In practical working I prefer to employ an excess of pyrites, as some of the
sulphur is volatilized by dissociation of the pyrites by heat before the principal
re-action takes place, some is decomposed by the humidity contained in the mixture
and by the unavoidable access of air and by the oxidizing flame in the calcined
mixture.
The sulphurous acid (extremely concentrated and mixed with the strictly
necessary quantity of air) which is disengaged in these reactions, can be as in my
before mentioned former process, very conveniently utilized for transforming
alkaline chlorides or chlorides of the alkaline earths, into the corresponding
sulphates and chlorine, or hydrochloric acid.

page_text: The production of chlorine is rendered much easier by using instead of atmospheric
air, the well known oxygen yielding compounds.
Dated this 19th day of November 1895.
JOHNSONS & WILLCOX,
47 Lincoln's Inn Fields, London, W.C., Agents.
Improvements in the Manufacture or Production of Alkaline
Silicates, or Silicates of the Alkaline Earths, and of Chlorine
or Hydrochloric Acid.
I, DMITRY ALEXANDROWITCH PÉNIAKOFF of Rue Bauduin Pierré Huy, in
the Kingdom of Belgium, Chemist do hereby declare the nature of my 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 Letters Patent No. 20604 of 1893 I have described a
process for obtaining aluminates by treating aluminous earths, containing very
small quantities of silica, with alkaline sulphates, under the influence of alkaline
sulphides, or of pyrites. I have discovered that silica behaves in a manner quite
analogous to that of the aluminous earths. The reaction produced with the
corresponding salt of sodium for instance is as follows:-
In practical working I prefer to employ an excess of pyrites, as some of the
sulphur is volatilized by dissociation of the pyrites by heat before the principal
reaction takes place, some is decomposed by the humidity contained in the mixture
and by the unavoidable access of air and by the oxidizing flame in the calcined
mixture.
The sulphurous acid (extremely concentrated and mixed with the strictly
necessary quantity of air) which is disengaged in these reactions, can be, as in my
before mentioned former process, very conveniently utilized for transforming
alkaline chlorides, or chlorides of the alkaline earths, into the corresponding
sulphates, and chlorine, or hydrochloric acid.

page_text: The production of chlorine is rendered much easier by using, instead of
atmospheric air, the well known oxygen yielding compounds.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed 1 declare that what I
claim is :-
The manufacture of alkaline silicates or silicates of the alkaline earths by
heating together (whilst air is excluded) silica or a silicate and alkaline sulphate
or a sulphate of an alkaline earth and alkaline sulphide or a sulphide of an
alkaline earth or pyrites substantially as herein before described and either with
or without the utilization of the evolved sulphurous acid for the production of
chlorine or hydrochloric acid.
Dated this 24th day of July 1896.
JOHNSONS & WILLCOX,
47 Lincoln's Inn Fields, London, W.C., Agents.