Manufacture of a New Chemical Salt of Valuabie Antiseptic Properties.
Year: 1898

page_text: PROVISIONAL SPECIFICATION.
Manufacture of a New Chemical Salt of Valuabie Antiseptic Properties.
We, ALBERT EUSTACE BERRY, Chemist and Works Manager, and A. BOAKE,
ROBERTS AND COMPANY LIMITED, both of Warton Road, Stratford, London, E.,
in the County of Essex, do hereby declare the nature of this invention to be as
follows:
This invention relates to the manufacture of a new chemical salt of valuable
antiseptic properties “forming definite crystals having the empirical formula
H. CHO. KS,O, which may be termed formaldehyde potassium metabisulphite.
This salt when in solution and on the addition of acid yields formaldehyde and
sulphurous acid. The manufacture is effected by adding a solution of formalde-
hyde to a solution of metabisulphite of potassium which may be that made
according to the Specification No. 5882 of 1885. The mixed solutions are con-
centrated by evaporation to about 1'45 sp. gr. care being taken that the temperature
does not exceed 200° F. and the compound is allowed to crystallise out by leaving
the residual liquor to cool.
Instead of applying formaldehyde in solution it may be used as a gas bubble:
through the solution of metabisulphite of potassium.
Instead of a potassium salt a corresponding sodium salt may be similarly manu-
factured.
Dated the 10th in of T..1.. 1000
ABEL & IMRAY,
Agents for the Applicants.
Manufacture of a New Chemical Salt of Valuable Antiseptic Properties.
We, ALBERT EUSTACE BERRY, Chemist and Works Manager, and A. BOAKE.
ROBERTS AND COMPANY LIMITED, both of Warton Road, Stratford, London, E.,
in the County of Essex, do hereby declare the nature of this invention and in
what manner the same is to be performed, to be particularly described and ascer-
tained in and by the following statement:-
This invention relates to the manufacture of a new chemical salt of valuable
antiseptic properties forming definite crystals having the empirical formula
H.CHO.KS, which may be termed formaldehyde potassium metabisulphite.
This salt when in crystal form or in solution, and on the addition of acids or
alkalis yields formaldehyde and sulphurous acid.

page_text: The manufacture is effected by adding a solution of formaldehyde to a solution
of metabisulphite of potassium, which may be that made according to the Specifi-
cation No. 5882, of 1885.
The mixed solutions are concentrated by evaporation to about from 145 to 1'50
specific gravity, care being taken that the temperature does not exceed 200° F.,
and the compound is allowed to crystallize out by leaving the residual liquor to
cool
Instead of applying formaldehyde in solution, it may be used as a gas and
bubbled through the solution of metabisulphite of potassium, or the metabisulphite
of potassium in a powdered form may be dissolved in a solution of formaldehyde.
Instead of a potassium salt a corresponding sodium salt may be similarly manu-
factured.
The crystals so prepared are composed of formaldehyde and potassium metabi-
sulphite in the form of a new compound, which when in solution and brought into
contact with acids, such as are formed in cases of putrefaction and deterioration
separates out into formaldehyde and potassium metabisulphite.
We preferably use in manufacture equal volumes of a concentrated solution of
both formaldehyde and potassium metabisulphite, but we do not confine ourselves
to such proportions.
Having now particularly described and ascertained the nature of our said inven
tion and in what manner the same is to be performed, we declare that what we
claim is:-
(1) The manufacture of such a compound, and
The Go of on antiarutio