Improvements in the Preparation of Disinfectants, Deodorants, and Antiseptics.
Year: 1887

page_text: Date of Application, 22nd Mar., 1887.
Complete Left, 12th Aug., 1887.
Complete Accepted, 14th Oct., 1887
PROVISIONAL SPECIFICATION.
Improvements in the Preparation of Disinfectants, Deodorants, and
Antiseptics.
Dr. AUGUST DUPRÉ Westminster Hospital Medical School, Caxton Street, West-
minster, Analytical Chemist and CECIL NAPIER HAKE, 14 Great Smith Street,
Westminster, Analytical Chemist, do hereby declare the nature of this invention to
be as follows :-
In order to increase the oxidizing effect of manganate it is usually employed in
conjunction with sulphuric acid. Such addition is, however, in many cases, objection-
able and inconvenient, as the materials cannot be kept ready mixed in the form of a
powder.
To overcome this difficulty and in order to form in some cases a combined Disinfectant,
or Deodorant and Antiseptic we mix the powdered manganates or permanganates with
any or all of the following:
Alkaline bi-carbonates and bi-chromates, Boric acid and Sulphates and Chlorides,
the base of which is precipitated by an alkali other than such as reduce the manganic
or permanganic acid.

page_text: We, AUGUST DUPRÉ and CECIL NAPIER HAKE, both of Westminster Hospital
Medical School, Caxton Street, Westminster, S. W., 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 :-
The manganates and permanganates of the alkalies have long been used as
disinfectants, the value of the substance as a disinfectant depending for the most part
upon the percentage of permanganate or of manganate present. The permanganates
of the alkalies are, for most purposes, too expensive for ordinary use, and it has been
the practice to use a manganete of the alkalies and to add to it when in use free
sulphuric acid, thus producing a re-action and causing the formation of permanganate.
This method of use is open to many objections which are obvious.
We are aware that it has been attempted to surmount some of these objections by
using a mixture of manganate of soda with a bi-sulphate of soda. This is open to the
objection that the compound is deliquescent, and that it is difficult to keep for any
length of time. We have ascertained that a mixture of manganate of soda and either
sulphate of magnesia, sulphate of zinc, boracic acid, or sulphate of lime is not open
to the objections of mixtures of free sulphuric acid or the bi-sulphate of soda with the
manganate, whilst when moistened, the result is fully as efficacious and in the event of
boracic acid being used the mixture is valuable not only as a disinfectant but as an
antiseptic.
For commercial purposes we prefer to use sulphate of magnesia in the natural form
of Kieserite. We, reduce it to a fine powder and mix it with commercial manganate
of soda in the proportion of one part of Kieserite to two of manganate. When the
mixture is to be used, it is mixed with water; chemical decomposition at once sets in
and permanganate of soda is formed. Sulphate of lime may be used in place of
Kieserite but the action of the mixture is imperfect and slow, although perhaps the
compound is somewhat cheaper. Sulphate of zinc may be used in place of Kieserite
when the matter to be deodorized or disinfected contains sulphuretted hydrogen-since
the oxide of zinc formed during decomposition absorbs the sulphuretted hydrogen
producing sulphate of zinc and thus economizing manganate.
When an antiseptic as well as a disinfectant is desired, we use boracic acid in the
proportion of two parts of manganate to one of commercial boracic acid, or else we
treat borate of lime with an equivalent of sulphuric acid and use the result in equivalent
proportions, as will be well understood.

page_text: 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;-
The mixture of manganates of the alkalies with either sulphate of magnesia,
sulphate of zinc, sulphate of lime, or boracic acid, or with any two or more of the
same in combination in the manner and for the purposes hereinbefore described.
Dated this 11th day of August 1001.
A. DUPRÉ.
C. N. HAKE.
By A. M. & Wm. Clark,
53, Chancery Lane, London,
Patent Agents.