Improvements in Preparing and Using Permanganate of Soda.
Year: 1890

page_text: Date of Application, 20th Sept., 1890
· Complete Specification Left. 19th June, 1891-Accepted. 1st Aug.. 1891
PROVISIONAL SPECIFICATION.
Improvements in Preparing and Using Permanganate of Soda.
I RICHARD LEIGH Director Moses Gate, near Bolton do hereby declare the
nature of this invention to be as follows:-
My invention consists of an improved method of producing permanganate of soda
as a deodorizer & disinfectant, in a cheap form.
I produce the permanganate of soda from the green manganate of soda by what
I call a dry method whereby I overcome the difficulty of crystallization met with in
the wet method.
In carrying out my invention I take manganate of soda and place it in a vessel,
by preference vertical, and I inject moist air or a mixture of air & steam, by which
the amorphous manganate is oxidized into permanganate in the form of small red
crystals.
Instead of injecting air & moisture into the green manganate, I also expose such
manganate in thin layers, to the action of damp air occasionally turning it over so as
to expose fresh manganate to the action of the air, and cover up those particles
which are sufficiently oxidised.
Dated this 19th day of Sentember 1890.
RICHARD LEIGH.
COMPLETE SPECIFICATION.
Improvements in Preparing and Using Permanganate of Soda.
I, RICHARD LEIGH Starrcliffe Moses Gate Bolton Managing Director of
Limited Company 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 :-
My invention consists of an improved method of producing permanganate of soda
and of using the same when made according to this invention.
I produce the permanganate of soda from the green manganate of soda by what I
call a dry method of oxidation, whereby I avoid the difficulty of crystallization, met
with when the manganate is first dissolved in water and oxidized whilst in
solution.
In carrying out my invention I take the green amorphous manganate of soda,
and place it in a vessel, by preference vertical and I inject moist air or a mixture of
steam and air by which the manganate absorbs air and sufficient moisture for
crystallization, the result being that instead of the amorphous green salt I obtain
a purple crystallized salt of permanganate of soda.
Further oxidation is then
stopped.
Instead of passing air and moisture through the manganate the said manganate
may be oxidized by exposing it in thin layers to the action of the atmosphere in a
damp situation, occasionally turning it over so as to bring fresh particles of the
manganate into contact with the air.
Oxidation is facilitated by neutralizing the alkali of the manganate of soda by an
acid or salt, but I prefer the method of spontaneous oxidation already named.
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 :-
1. An article of commerce, prepared from manganate of soda, by exposing it to
damp air, or oxidizing it by any means, without dissolving it in water.

page_text: 2. The use of the permanganate of soda so prepared for deodorizing and
disinfecting.
3. The use of permanganate of soda prepared as described for oxidizing in the
preparation of drying oils, in bleaching dyeing printing and for any use to which
permanganate of potash is at present employed.
Dated this 18th day of June 1891.
RICHARD LEIGH.