Improvements in the Preservation of Peroxide of Hydrogen.
Year: 1888

page_text: Date of Application, 5th Nov., 1888
Complete Specification Left, 2nd Aug., 1000 Accepted, 12th Oct., 1000
1000
PROVISIONAL SPECIFICATION.
Improvements in the Preservation of Peroxide of Hydrogen.
1, CHARLES THOMAS KINGZETT, F.I.C., F.C.S., Past Vice President Society of
Public Analysts, of 96 Amhurst Park, in the County of Middlesex, do hereby
declare the nature of this invention to be as follows:-
Peroxide of hydrogen is used for bleaching, oxidising and other purposes, but is, as
is well known to chemists, liable to undergo spontaneous decomposition into water
and oxygen so that its strength diminishes when kept. To obviate this loss of strength
I add to such solutions a small proportion of one or more of the following substances
which I have found by experimenting to be more or less efficacious for the purpose in
question.
Acetic acid, alcohol, chloral, chloroform, glycerine, thymol, phenylacetic acid,
sulphophenic acid and bisulphate of potassium or tisulphate of sodium.
Dated this 5th day of November 1888.
CARPMAEL & Co.,
Agents.
COMPLETE SPECIFICATION.
Improvements in the Preservation of Peroxide of Hydrogen.
1, CHARLES THOMAS KINGZETT, F.L.C., F.C.S., Past. Vice President Society of
Public Analysts, of 96 Amhurst Park, in the County of Middlesex, 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 :-
Peroxide of Hydrogen is used for bleaching, oxidising and other purposes, but is,
as is well known to chemists, liable to undergo spontaneous decomposition into water
and oxygen so that its strength diminishes when kept. This may be more or less
obviated by the addition to it of camphor, camphoric acid, thymol, phenylacetic acid,
or sulphophenic acid. The addition of such substances to peroxide, of hydrogen is
described and claimed in the specification of a former patent granted to me No. 276 in
the year 1887. It may also be more or less obviated by the addition to it of bisulphate
of potassium or bisulphate of sodium as described in an application for patent made by
me No. 15994 in the year 1888.
I have further discovered that it may also be obviated by the addition to such
solutions of a small proportion of acetic acid, alcohol, chloral, chloroform or
glycerine.
1 bave ascertained by a practical investigation that by adding a proportion of one
or more of these latter substances the peroxide of hydrogen may be preserved more or
less from deterioration in strength.
I have found that although larger or smaller quantities may be used, one per cent.
by weight serves very well for my purpose and of the various preservative chemical
agents I have named I prefer alcohol.
In illustration of the preservative influence exercised by alcohol I may mention
that by the addition of one per cent. by weight to a solution of peroxide of hydrogen
I have limited the loss in strength in one case to 7 per cent. during a period of
202 days and in another case to 11 per cent. during a period of 97 days, the latter
observation having been made during part of the hottest summer weather when
peroxide of hydrogen is most prone to decomposition. As a check against these
results quantities of the same solutions of peroxide of hydrogen without the addition
of any other substances were kept during the same periods the losses in strength
being respectively 39 % and 54%

page_text: Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed 1 declare that what I
claim is :-
The preservation of peroxide of hydrogen by the addition to it, of alcohol, acetic
acid, chloral, chloroform or glycerine.
Dated this 26th day of July 1889.
CHARLES THOMAS KINGZETT.