Improvements in the Manufacture of Prussiates.
Year: 1895

page_text: Date of Application, 27th Apr., 1895
Complete Specification Left, 27th Jan., 1896-Accepted, 29th Feb., 1896
PROVISIONAL SPECIFICATION.
Improvements in the Manufacture of Prussiates.
I, HENRY BOWER, of 29th Street and Gray's Ferry Road, Philadelphia U.S.A.
now residing at Tavistock Hotel, Covent Garden, London, do hereby declare the
nature of this invention to be as follows :-
A ready means for the convertion of sulphocyanides into prussiates is a
desideratum ; I do this in connection with the ordinary and well known process
of making prussiate of potash from carbonate of potash. I heat together in a
suitable pot and in the usual way carbonate of potash, iron and animal matter
such as feather cuttings and the like; then preferably towards the end of the
operation, I add sulpho cyanide of iron to the other materials in the pot. The
sulphocyanide is reduced and on water being added becomes prussiate of potash
and goes to increase the yield.
In like manner prussiate of soda may be made.
Di
1 1005
Improvements in the Manufacture of Prussiates.
I HENRY BOWER, of 29th Street and Gray's Ferry Road, Philadelphia, U.S.A.
now residing at Tavistock Hotel, Covent Garden, London 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 my Specification No. 8330 in the year 1895, I have described a method of
obtaining and separating from gas liquor, sulphocyanide of iron, a product not
hitherto produced commercially.
My present invention relates to improvements in the manufacture of prussiates, -
and the object of my invention is to furnish a method for the conversion of
sulphocyanides into prussiates.
I heat in a suitable vessel carbonate of potash (or carbonate of soda), iron, and
animal matter, such as comminuted leather, horn, hoofs, or the like, as is done in
the ordinary and well-known method of making prussiate of potash from carbonate
of potash, or prussiate of soda from carbonate of soda, and then, at any stage,
but preferably toward the end of the operation, add to the mass in the vessel, from
time to time, in small portions, sulphocyanide of iron which may have been
obtained by my process, above referred to, and in quantity such as to be entirely
decomposed. The sulphocyanide is reduced to a cyanide and mixes with the other
materials in the vessel. After the operation of fusion is completed, the resulting
melt contains cyanide of potassium, sulphide of potassium, and sulphide of iron,
and being removed from the vessel, is cooled and lixiviated with water, whereupon
from the resulting alkaline solution prussiates are formed and are separated by
crystallization in the well-known manner.

page_text: 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 :-
The process of producing prussiate of potash or soda from sulphocyanide of
iron, which consists in forming cyanide of potassium, adding to this the sulpho-
cyanide during fusion, then cooling the mass and lixiviating with water and
crystallizing out the prussiates as and for the purpose described.
Dated this 27th day of January 1896.
CARPMAEL & Co.,
Agents for the Applicant.