Improvements in the Manufacture of Soda and Potash.
Year: 1890

page_text: Date of Application, 20th Jan., 1890
Complete Specification Left, 20th Oct., 1890-Accepted, 6th Dec., 1890
PROVISIONAL SPECIFICATION.
Improvements in the Manufacture of Soda and Potash.
I, FRANCIS ELLERSHAUSEN, of Hebburn-on-Tyne, in the County of Northumberland,
Gentleman, do hereby declare the nature of this invention to be as follows:-
My invention chiefly relates to the production of caustic soda from black-ash, in
such a manner that I am enabled to dispense with the use of the large quantities of
water which were heretofore necessary and which had to be subsequently evaporated,
and consequently of the large quantities of fuel necessary for such evaporation; and
to thus produce soda more rapidly and economically than heretofore.
According to my present invention I take a strong solution of black-ash and mix
the same with sufficient pulverized peroxide of iron to produce a mass having the
consistency of, say, a thick paste.
This mass is introduced into a furnace and calcined whereby it is converted into
ferrate of soda.
This product is next lixiviated in sufficient warm water to form a strong solution,
the soda being converted into hydrate of soda or caustic soda, and the iron precipitated
in the form of peroxide, which can be again used for future operations.
The solution of the caustic soda can be concentrated in the usual manner. The
carbonate of soda, known as fished salts, obtained during the operation of concen-
trating the caustic liquor may be mixed with the black-ash liquor during subsequent
operations and formed into paste as aforesaid with the peroxide of iron.
Although I have referred only to the manufacture of caustic soda it is to be
understood that my invention is also applicable for the manufacture of caustic
potash.
Dated the 20th day of January 1890
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in the Manufacture of Soda and Potash.
I, FRANCIS ELLERSHAUSEN, of Hebburn-on-Tyne, in the County of Durham,
Gentleman, 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 :-
My invention chiefly relates to the production of caustic-soda from black ash or
carbonate of soda in such a manner that I am enabled to dispense with the use of the
large quantities of water which were heretofore necessary and which had to be sub-
sequently evaporated, and consequently of the large quantities of fuel necessary for
such evaporation, and to thus produce soda more rapidly and economically than
heretofore.
According to my invention 1 take a strong solution of black ash and mix the same
with sufficient pulverized peroxide of iron to produce a mass having the consistency
of, say, a thick paste.
This mass is introduced into a furnace and calcined whereby it is converted into
ferrate of soda (sometimes also called ferrite of soda).
This product may be lixiviated in sufficient warm water to form a strong solution,
the soda being converted into hydrate of soda or caustic soda, and the iron precipitated
in the form of hydroxide of iron which can be again used for future operations. Or
this product may be used in conjunction with a solution of sulphide of sodium for
Pin d

page_text: tbe reduction of caustic soda in the manner described in the Complete Specification
of my application No. 1015 of 1890 of even date herewith.
The
The solution of the caustic soda can be concentrated in the usual manner.
carbonate of soda, known as fished salts, obtained during the operation of concen-
trating the caustic liquor, may be mixed with the black ash liquor during subsequent
operations and formed into paste as aforesaid with the peroxide of iron.
Although I have referred only to the manufacture of caustic soda my invention is
also applicable for the manufacture of caustic potash by substituting carbonate of
potash for carbonate of soda.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :
(1.) The improvement in the manufacture of caustic soda or potash from carbonates
consisting in mixing a strong carbonate solution with peroxide of iron and then
calcining and lixiviating the mass, substantially as described.
(2.) In the manufacture of caustic soda or caustic potash the production of ferrate
of soda or ferrate of potash in the manner herein before described.
Do
1000
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.