Improvements in or relating to the Manufacture of Permanganate of Soda, or of a Mixture of the same with other Disinfecting or Oxidising Matter.
Year: 1887

page_text: Date of Application, 8th June, 1887
Complete Left, 7th Mar., 1888
Complete Accepted, 20th Apr., 1888
Improvements in or relating to the Manufacture of Permanganate
of Soda, or of a Mixture of the same with other Disinfecting
or Oxidising Matter.
We, GEORGE HARRISON BOLTON, JOSIAH RIGBY WYLDE, and HENRY AUER, all
of Widnes in the County of Lancaster, Manufacturing Chemists, do hereby declare
the nature of this invention to be as follows :-
Manganate of soda, made by any known method, instead of being treated with an
acid to form permanganate, is treated (dissolved in water) with chlorine. The solution
can be pure, or can contain free alkali. If merely a disinfecting mixture be required,
the quantities of chlorine and of alkali, are so proportioned as to obtain a mixture of
hypochlorite of soda and permanganate of soda in the required proportions. If the
permanganate be required clear of hypochlorite, the chlorinating of the permanganate
of soda solution is continued, till the alkali, not required to form permanganate,, is
transformed into chlorate. The settled liquor is now evaporated down to about
70 degrees Twaddle, and the permanganate and chlorate separated by fishing and
fractional crystallisation.
The insoluble matter in the manganate can be used over again to manufacture new
quantities of manganate of soda, or in the manufacture of chlorine.
WM. P. THOMPSON & Co.,
Of 6, Lord Street, Liverpool,.
Agents for the Applicants..

page_text: Improvements in or relating to the Manufacture of Permanganate
of Soda, or of a Mixture of the same with other Disinfecting
or Oxidising Matter.
We, GEORGE HARRISON BOLTON, JOSIAH RIGBY WYLDE, and HENRY AUER, all
of Widnes in the County of Lancaster, Manufacturing Chemists, 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:-
Alkaline manganate, as obtained by igniting a mixture of oxide of manganese and
eaustic alkali, always contains a quantity of these ingredients still uncombined. We
accordingly treat with chlorine, the aqueous solution of all that is soluble in the
ignited mass. By this means, the alkaline manganate is converted into permanganate
and the caustic alkali into the corresponding hypochlorite, chlorate and chloride, or if
the action has been continued long enough, into chlorate and chloride only.
The insoluble oxide of manganese left after lixiviation, if sufficiently pure, can be
furnaced with a fresh charge of caustic alkali. The mixed solution of alkaline
permanganate and hypochlorite or chlorate possesses strong bleaching oxydising and
deodorising properties, and can be used for either of these purposes without further
treatment. If, however, the material be required in the solid state, the water in it is
driven off or evaporated by heat. During the evaporation, the hypochlorite is con-
verted into chlorate and chloride. The latter, when soda is the alkali employed, (and
it is for the soda salts, rather than the potash only, that our process is specially
designed) is fished out from time to time. We thus obtain almost pure permanganate
and chlorate of soda, which by further concentration are obtained intimately mixed in
the solid form.
In carrying out the process, the solution of manganate operated on is preferably
about 20 degrees Twaddle to start with. It is treated with chlorine until the green
color of the manganate changes to the red of the permanganate, and until there is
no more alkaline reaction. The carefully settled solution evaporated to 100 degrees
Twaddle, the chloride of sodium which falls out from 50 degrees Twaddle and upwards
is fished out, and the remaining liquor settled and evaporated still further, preferably
with steam, until it reaches the point at which it will solidify on cooling-easily found
by testing small samples. The fished out salts contain about 3 per cent. of per-
manganate and can be used as a disinfectant. The reaction of the chlorine in the
crude manganate, is illustrated by the following equations.
Having now particularly described and ascertained the nature of the said
invention, and in what manner the same is to be performed, we declare that what
we claim is —
1. The process of manufacturing a comparatively pure permanganate of soda from
the manganate by means of chlorine, substantially as described.

page_text: 2. The utilisation of the waste caustic alkali, contained in the manganate, by means
of chlorine, substantially as described.
3. The new or improved disinfecting or oxidising material consisting almost entirely
of a mixture of alkaline permanganate and alkaline hypochlorite or chlorate, with or
without water, substantially as described.
4. The manufacture and use as a disinfectant of the otherwise waste product,
consisting mainly of common salt and permanganate, substantially as described.
ות
11 1
1 1000
WM. P. THOMPSON & Co.,
Of 6, Lord Street, Liverpool,
Agents for the Applicants.