Improvements in the Manufacture of Permanganates of Soda or Potash from Manganates of Soda or Potash.
Year: 1893

page_text: Date of Application, 12th Apr., 1893
Complete Specification Left, 12th Jan., 1894-Accepted, 17th Feb., 1894
PROVISIONAL SPECIFICATION.
Improvements in the Manufacture of Permanganates of Soda or
Potash from Manganates of Soda or Potash.
We JOHN BROCK of Wellfield, Farnworth Widnes in the County of Lancaster,
Alkali Manufacturer and FERDINAND HURTER, Ph. D. of Widnes aforesaid
Analytical Chemist do hereby declare the nature of this invention to be as
follows:-
This invention relates to the manufacture of permanganates of soda or potash
from manganates of soda or potash by means of carbonic acid gas. In practice it
has been found that such manganates (particularly manganate of soda) do not
readily absorb carbonic acid gas and it is therefore very difficult to convert them
into permanganates.
According to this invention water is added to the manganate either before or
during the treatment with carbonic acid gas. The water may be added in any
suitable way either in the form of liquid or as steam. Usually a quantity of water
equal to from about one-seventh to one-third of the weight of the manganate will
be sufficient but the invention is not limited to any particular amount of water.
It is preferred to use the water in the form of a fine spray and to agitate the
manganate during its addition. A revolving cylinder provided with breakers may
be used for the purpose.
If the water be added before the treatment with carbonic
acid gas a current of air may be used with the water.
The manganate to be treated should be finely ground or divided and if the
treatment with water renders it desirable it can be ground or divided again before
treatment with the carbonic acid gas or the final portion thereof. By the means
described the manganates are readily and thoroughly transformed into perman-
ganates any excess of alkali they may contain being transformed into carbonate or
bi-carbonate of the alkali.
Dated this 12th day of April 1893.
J. H. JOHNSON & Co.,
47, Lincoln's Inn Fields, Agents.
COMPLETE SPECIFICATION.
Improvements in the Manufacture of Permanganates of Soda or
Potash from Manganates of Soda or Potash.
We JOHN BROCK of Wellfield Farnworth Widnes, in the County of Lancaster
Alkali Manufacturer and FERDINAND HURTER Ph. D. of Widnes aforesaid
Analytical Chemist 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 :-
This invention relates to the manufacture of permanganates of soda or potash
from solid manganates of soda or potash by means of carbonic acid gas. We have
found in practice that such manganates (more particularly manganate of soda) do
not readily absorb carbonic acid gas and it is therefore very difficult to convert
them into permanganates by the action of carbonic acid gas.
According to our invention water is added to the solid manganate either before
or during the treatment with carbonic acid gas. The water may be added in any
D....oll

page_text: suitable way either in the form of liquid or as steam. Usually a quantity of water
equal to from about one seventh to one third of the weight of the manganate is
sufficient, but the invention is not limited to the use of any particular amount of
water provided that the mass is not rendered pasty thereby. The addition of water
causes the manganate to absorb very readily carbonic acid gas and thus greatly
facilitates the conversion into permanganate.
We prefer to spread out the ground manganate and sprinkle over it the necessary
quantity of water in the condition of a fine spray and to turn over or agitate the
manganate during the addition of water. Should the powder, cake into large lumps
we break these or if necessary grind the manganate again. When water to about
say 20 cent. has been added and the material has been thoroughly mixed, it is
charged into a chamber or into a revolving cylinder provided with breakers or
stirrers such for instance as has been described by William Jones Menzies in his
Specification of Letters Patent No. 1213 of 19th January 1893.
per
In this chamber or cylinder we treat the manganate with carbonic acid gas which
is rapidly absorbed by the hydrated manganate with evolution of heat, the
manganate being converted into solid permanganate and any free alkali contained
therein is transformed into carbonate or bicarbonate.
We may add the water to the manganate in the revolving cylinder itself by
passing steam through the cylinder until the manganate has absorbed the necessary
quantity of moisture. Or we may use in lien of steam a spray of water carried into
and through the cylinder by means of a current of air which may be propelled by
a fan and we continue this operation until the manganate has absorbed the necessary
quantity of water. In either case we treat the manganate after it has been
sufficiently moistened, with carbonic acid gas in the same cylinder. Or we may
add the water to the manganate together with the carbonic acid gas.
In that case
we moisten the carbonic acid gas either by passing the gas through hot water
before entering into the revolving cylinder, or by injecting into the carbonic acid a
finely divided spray of water or preferably a small jet of steam.
In either case we use such a revolving cylinder as has been described by Menzies
in the Specification of his aforesaid Patent.
If during the treatment of the manganate in the revolving cylinder, either with
steam or with water and air, or with water and carbonic acid gas, or with carbonic
acid gas alone, the manganate should agglomerate, or cake together or ball into
lumps, it should be removed from the cylinder, and any lumps be broken or the
material be ground again, before the final portion of the carbonic acid gas is added.
By these means, the manganates are readily and thoroughly converted into solid
permanganates, any excess of alkali they may contain being transferred into
carbonate or bicarbonate of the alkali.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed we declare that what
we claim is :-
1. In the manufacture of solid permanganates of soda or potash from solid
manganates of soda or potash, the addition of water (either as liquid or as steam)
previous to the treatment of the solid manganate with carbonic acid gas, for the
purposes hereinbefore set forth and substantially as described.
2. In the manufacture of solid permanganates of soda or potash from solid
manganates of soda or potash the addition of water (either as liquid or as steam)
during the treatment of the solid manganate with carbonic acid gas, for the purposes
hereinbefore set forth and substantially as described.
Dated the 19th day of January 1894
JOHNSONS & WILLCOX,
47, Lincoln's Inn Fields, London, Agents.