IMPROVEMENTS IN THE SEPARATION OF SUBSTANCES AND PRODUCTS CAPABLE OF BEING EMPLOYED FOR THE PURPOSES OF DYEING AND PRINTING
Year: 1872

page_text: PROVISIONAL SPECIFICATION left by Edward Chambers Nicholson at
the Office of the Commissioners of Patents, with his Petition, on
the 11th October 1872.
I, EDWARD CHAMBERS NICHOLSON, of Herne Hill, in the County of
Surrey, Gentleman, do hereby declare the nature of my said Invention
for "IMPROVEMENTS IN THE SEPARATION OF SUBSTANCES AND PRODUCTS CAPABLE
OF BEING EMPLOYED FOR THE PURPOSES OF DYEING AND PRINTING,' to be as
follows:-
"
This Invention relates to the separation of what is known as
roseaniline base from other products and compounds which are either
formed during its formation or subsequently in effecting its liberation.
Roseaniline base is obtained as is well understood by firstly heating
together aniline, videlicit, what is known as commercial aniline with a
solution of arsenic acid in such a manner as is described in the
Provisional Protection granted to me, No. 184, and dated January 25, 1860,
or otherwise in order that the desired compounds of rosaniline base
shall be formed, which together with arsenious acid and the excess of
or the undecomposed arsenic acid and other products will constitute
what is technically known as the "melt." The melt thus or otherwise
obtained is dissolved in water and the compounds of the rosaniline base
in solution or otherwise are decomposed by means of a stronger base,

page_text: such for example as lime, and the liberated base is separated from the
insoluble products thus resulting by solution in water heated to the
boiling point under the ordinary or normal pressure, the solution of the
rosaniline base is allowed to cool, and the crystals deposited are
collected and utilized for the production of dyes or colors, as is well
understood. The rosaniline base thus or otherwise separated and
obtained is found to possess but a slight solubility in water boiling at
the ordinary or normal pressure, consequently a very large proportion of
water is required to effect the solution of a small proportion of the base,
in practice it being found that one pound of the base is obtained from a
solution of about 60 gallons of water.
Now my Invention consists in effecting the solution of the so called
rosaniline base or magenta base obtained or resulting from the processes
berein-before mentioned, or otherwise obtained in water heated under
pressure, whereby a greater solubility of such base is obtained, and 1
consequently the amount of water necessary for effecting the solution of
a given quantity of such base is very much diminished.
In carrying out this Invention I take the melted mass resulting from
the foregoing or other similar processes, and reduce that which is
technically known as the "melt" to a rough powder, by means of edge 2
rollers or otherwise, and I mix the same either during such process of
grinding or subsequently with caustic lime either hydrated or otherwise,
and in such quantity as shall suffice to neutralize any acid, and liberate
the rosaniline or magenta base. Such mixture or product I then
transfer together with water into a suitable apparatus or boiler capablo 2
of withstanding an elevated pressure to which I apply heat.
The desired solution having been obtained by reason of the elevation
of the pressure and consequent increase of temperature, the solution or
the contents of the boiler may be transferred either before or after
subsidence to another vessel wherein the separation of the rosaniline 3
and magenta base thus extracted may be effected. Should the
rosaniline or magenta base not be fully extracted by the first treatment
by means of water heated under pressure the treatment may be
repeated.