Improvements in the Manufacture of Sulphide of Sodium or of Sulphide of Potassium from their Respective Sulphates.
Year: 1888

page_text: Date of Application, 2nd Mar., 1888
Complete Specification Left, 22nd Nov., 1888
Complete Specification Accepted, 31st Dec., 1888
Improvements in the Manufacture of Sulphide of Sodium or of
Sulphide of Potassium from their Respective Sulphates.
We FREDERICK HERBERT GOSSAGE and THOMAS TRAIN MATHIESON both of Widnes
in the County of Lancaster Manufacturing Chemists do hereby declare the nature of
this Invention to be as follows:-
The object of this Invention is to manufacture Sulphide of Sodium or of Potassium
from their respective Sulphates without destroying the lining of the furnace in which
the reduction is made.
According to this Invention there is added to a mixture of Sulphate of Soda or of
Potash and carbonaceous matter a sufficient quantity of common Salt the presence of
which in the furnace during the process of reduction prevents the injurious action of
the Sulphide upon the lining of the furnace.
The mixture of Sulphide and Common Salt thus formed may be drawn from the
furnace into open vessels and cooled before lixiviation without danger of oxidation.
The mixture is then lixiviated and a solution obtained of the requisite strength to yield
crystals of Sulphide of Sodium or of Potassium.
A solution of these crystals or the liquors obtained by lixiviation as aforesaid are
suited for the obtainment of bi-carbonate of Soda or of Potash by the treatment
described in the Specification of Letters Patent No. 227 granted to Neil Matheson and
Josef Hawliezek and dated 6 January 1886.

page_text: Sulphide of Potassium from their Respective Sulphates.
We FREDERICK HERBERT GOSSAGE and THOMAS TRAIN MATHIESON both of Widnes
in the County of Lancaster Manufacturing Chemists 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:-
The object of this Invention is to manufacture sulphide of sodium or sulphide of
potassium from their respective sulphates without destroying the lining of the furnace
in which the reduction is made. According to this Invention there is added to a
mixture of sulphate of soda or of sulphate of potash and carbonaceous matter a
sufficient quantity of chloride of sodium or common salt the presence of which in the
furnace during the process of reduction prevents the injurious action of the sulphide
upon the lining of the furnace. We do not limit ourselves to any precise proportion
of such common salt but generally we find that eight parts by weight of such salt
to every twenty parts by weight of the sulphate is sufficient.
The mixture of sulphide and common salt formed by the fusion of the charge in the
furnace may be drawn from the furnace into open vessels and cooled before lixiviation
without danger of oxidation. The mixture is then lixiviated and a solution obtained
of the strength requisite to yield crystals of sulphide of sodium or of sulphide of
potassium as the case may be.
A solution of these crystals or the liquor obtained by lixiviation as aforesaid is
suited for the obtainment of bi-carbonate of soda or of potash by the treatment
described in the Specification of Letters Patent No. 227 granted to Neil Mathieson
and Josef Hawliczek and dated the 6th day of January 1886.
Having now particularly described and ascertained the nature of the said Invention
and in what manner the same is to be performed we declare that what we claim is :-
In the manufacture of sulphide of sodium or sulphide of potassium the use of
chloride of sodium or common salt substantially as and for the purpose hereinbefore
described.
Dodel : Dul 1
200