An Improved Process for Manufacturing Alkaline Cyanides and other Cyanated Products.
Year: 1897

page_text: Date of Application, 10th Apr., 1897
Complete Specification Left, 8th Jan., 1898-Accepted, 5th Mar., 1898
PROVISIONAL SPECIFICATION.
An Improved Process for Manufacturing Alkaline Cyanides and other
Cyanated Products.
I, HENRI RAYMOND VIDAL, of 95, Boulevard Beaumarchais, Paris, in the
Republic of France, Chemical Engineer, do hereby declare the nature of this inven-
tion to be as follows:-
I have discovered a reaction which presents the greatest technical interest for
obtaining cyanides, ferrocyanides, cyanates, sulpho-cyanates and cyanogen.
Phospham P Az² H heated to red heat in presence of an alkaline carbonate,
sodium or potassium, gives a cyanate.
Thus I heat to red heat until the phospham has completely disappeared:-
6 kilogrammes
19
Phospham
Potassium carbonate
"
The material is exhausted by water or alcohol which dissolves the cyanate formed
and leaves a scarcely soluble phosphate.
The reaction may be represented by
P Az H2CO3 K² = PO K2 H + 2 C Az O K.
If in the preceding reaction I let coal (charbon) intervene in lieu of a cyanate
I obtain a cyanide.
I employ for the proportions hereinbefore stated 1.500 kilogrammes of pul-
verized coal.
When replacing the coal by iron I obtain ferrocyanide; in this case it is ex-
pedient not to raise the temperature beyond cherry-red heat; in order not to
decompose the ferrocyanide formed I replace in this case the coal by iron;
800 kilogrammes.
Sulphocyanides are obtained by heating the mixture for cyanate in presence of
sulphur. The proportions are then 4 kilogrammes of sulphur and 1 kilogramme
of coal.
I also obtain gaseous cyanogen by heating to dark-red heat a mixture of
Phospham
Neutral potassium oxalate dried
The reaction may be represented by
6 kilogrammes.
15
do.
P Az² HC2 0 K² = P O K2 H + C2 Az².
When replacing the neutral oxalate by acid oxalate in presence of coal I obtain
hydrocyanic acid.
Dated this 10th day of April 1897.

page_text: An Improved Process for Manufacturing Alkaline Cyanides and other
Cyanated Products.
I, HENRI RAYMOND VIDAL, of 95 Boulevard Beaumarchais, Paris, in the
Republic of France, Chemical Engineer, do hereby declare the nature of this inven-
tion and in what manner the same is to be performed, to be particularly described
and ascertained in and by the following statement:-
-
I have discovered a reaction which presents the greatest technical interest for
obtaining cyanides, ferrocyanides, cyanates, sulpho cyanates and cyanogen.
Phospham P Az² H heated to red heat in presence of an alkaline carbonate,
sodium or potassium, gives a cyanate.
Thus I heat to red heat until the phospham has completely disappeared:
Phospham
Potassium carbonate
-
6 kilogrammes
19
do.
The material is exhausted by water or alcohol which dissolves the cyanate formed
and leaves a scarcely soluble phosphate.
The reaction may be represented by:
PAZ H2CO3 K² = P 04 K2 H + 2 C Az O K.
If in the preceding reaction I let coal (charbon) intervene in lieu of a cyanate
I obtain a cyanide.
I employ for the proportions herein before stated 1.500 kilogrammes of pul-
verized coal.
When replacing the coal by iron I obtain ferrocyanide; in this case it is ex-
pedient not to raise the temperature beyond cherry-red heat; in order not to
decompose the ferrocyanide formed I replace in this case the coal by iron:
800 kilogrammes.
Sulphocyanides are obtained by heating the mixture for cyanate in presence of
sulphur. The proportions are then 4 kilogrammes of sulphur and 1 kilogramme
of coal.
I also obtain gaseous cyanogen by heating to dark-red heat a mixture of
Phospham
-
-
6 kilogrammes
Having now particularly described and ascertained the nature of my said in-
vention and in what manner the same is to be performed, I declare that what
I claim is:
First. The action of phospham upon an alkaline carbonate at a high tempera-
ture with the object of obtaining cyanates.
Second. The action of phospham upon an alkaline carbonate in presence of coal
(charbon) at a high temperature with the object of obtaining cyanides.
Third. The action of phospham upon an alkaline carbonate in presence of iron
with the object of obtaining ferrocyanides.

page_text: Fourth. The action of phospham upon an alkaline carbonate in presence of sul-
phur and coal with the object of obtaining sulphocyanates.
Fifth. The action of phospham upon a neutral oxalate with the object of obtain-
ing cyanogen..
Sixth. The action of phospham upon an acid oxalate in presence of coal with
the object of obtaining hydrocyanic acid.
Dated this 7th day of Tonnam 1898
HASELTINE, LAKE & CO.,
45, Southampton Buildings, London, W.C.,
Agents for the Applicant.