IMPROVE- MENTS IN THE MANUFACTURE OF CYANOGEN PRODUCTS FROM GAS RESIDUES
Year: 1878

page_text: LETTERS PATENT to William Virgo Wilson, of Jubilee Street, Mile End, in
the County of Middlesex, Color Manufacturer, for the Invention of "IMPROVE-
MENTS IN THE MANUFACTURE OF CYANOGEN PRODUCTS FROM GAS RESIDUES."
PROVISIONAL SPECIFICATION left by the said William Virgo Wilson at the
Office of the Commissioners of Patents on the 24th January 1878.
WILLIAM VIRGO WILSON, of Jubilee Street, Mile End, in the County of Middle-
sex, Color Manufacturer. "IMPROVEMENTS IN THE MANUFACTURE OF CYANOGEN
PRODUCTS FROM GAS RESIDUES."
This Invention has for its object the utilization of the cyanogen compounds often
found in some of the bye-products formed in the production of coal gas.
Several processes purporting to effect the manufacture of Prussian blue and
alkaline, and other ferrocyanides, have at various times been patented, but by none
of them have the commercial substances above named been produced of such purity
as to render their manufacture profitable. Now my Invention consists in the purifi-
cation of the crude products above referred to in the manner herein-after described :—
In the method usually adopted for the separation of the cyanogen compounds from
the refuse oxide of iron or other by-product, lime or some other well-known
re-agent is used, and the solution precipitated by a salt of iron. I adopt this
method, and then dry this precipitate and submit it to the action of petroleum,
petroleum spirit, benzol, or its homologues, but by preference to benzol, known com-
mercially as ninety per cent., when the tarry impurities will be entirely removed,
and the cyanogen blues or potassium, and other ferrocyanides of full commercial
value may be manufactured with facility by the usual well-known methods.
The apparatus for carrying out the purification should be of similar construction
to those used in the extraction of oil and other substances by bisulphide of carbon,
by means of which the loss of benzol would be avoided; and in the event of

page_text: sulphur being associated with the ferrocyanide precipitate it may previously be
treated with this re-agent (bisulphide of carbon) for its removal, when the benzol
purification could follow in the same apparatus.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said William Virgo Wilson in the Great Seal Patent Office on the 29th
May 1878.
WILLIAM VIRGO WILSON, of Jubilee Street, Mile End, in the County of Middle-
sex, Color Manufacturer. "IMPROVEMENTS IN THE MANUFACTURE OF CYANOGEN
PRODUCTS FROM GAS RESIDUES."
This Invention has for its object the utilization of the cyanogen compounds often
found in some of the bye-products formed in the production of coal gas.
Several processes purporting to effect the manufacture of Prussian blue, and
alkaline and other ferrocyanides, have at various times been patented, but by none
of them have the commercial substances above named been produced of such purity
as to render their manufacture profitable. Now my Invention consists in the purifi-
cation of the crude products above referred to in the manner herein-after described
In the method usually adopted for the separation of the cyanogen compounds from
the refuse oxide of iron or other bye-product of coal gas purification, lime or
some other well-known re-agent is used for the extraction, and the solution con-
taining the above products precipitated by a salt of iron. I adopt this method, and
then dry this precipitate and submit it to the action of petroleum, petroleum spirit,
benzol, or its homologues, but, by preference to benzol, known commercially as 90°/o,
when the tarry impurities will be entirely.. removed by their solution in this
re-agent, and the cyanogen blues or potassium, and other ferrocyanides, of full
commercial value, may be manufactured with facility by the usual well-known
methods.
The apparatus for carrying out the purification should be of similar construction
to those used in the extraction of oil and other substances by bisulphide of carbon,
by means of which the loss of benzol would be avoided; and in the event of sulphur
being associated with the ferrocyanide precipitate it may previously be treated
with this re-agent (bisulphide of carbon) for its removal, when the benzol puri-
fication could follow in the same apparatus.
:
I claim the purification of the ferrocyanides produced from the utilization of
bye-products resulting from the purification of coal gas in the manner above
described.
In witness whereof, I, the said William Virgo Wilson, have hereunto set
my hand and seal, this Fifteenth day of May, in the year of our Lord One
thousand sight hundred and corrents night