Manufacture of Conglomerates containing Alkaline Oxidising Bodies for Bleaching Linen and other objects.
Year: 1897

page_text: Date of Application, 18th Nov., 1897
Complete Specification Left, 2nd July, 1898- Accepted, 13th Aug., 1898
Manufacture of Conglomerates containing Alkaline Oxidising Bodies
for Bleaching Linen and other objects.
I, LOUIS HENRY FRENTZ, of Laeken, Brussels, Belgium, Chemist, do hereby declare
the nature of this invention to be as follows:-
This invention relates to a method of practically realising the application, to the
bleaching of linen and other objects, of alkaline oxidising bodies such as binoxide
of sodium, of potassium of magnesium. and other binoxides which can now be
supplied at reasonable prices by manufacturers thanks to the electro-chemical
process.
The domestic and practical employment of these bodies, which are all very
hygroscopic, was more or less impossible up to the present time, the difficulty
arising from the impossibility of practically preserving them in the open air.
For the purpose of protecting them as much as possible from the action of the
atmosphere, I bring them into the form of glomerated bodies by mixing them with
other alkaline products employed for bleaching purposes, such as silicate of soda
or potash, carbonate of soda, borax, &c., the former having for its object to produce a
protective silicious coating, while the latter have at the same time the effect of
increasing the efficaciousness of the oxidising body.
In effect the alkaline silicate (whether sodic or potassic) forms in consequence
of the action of the carbonic acid contained in the atmosphere a layer of silica (SiO2)
which is produced on the outer surface of the agglomerated bodies, so as to constitute
an effectual protective coating; this reaction is indicated by the equation
5 (NaSiO2, 6 H₂O) + 5 CO₂ = 2 Na₂CO, + 3 (NaCO + 10 H₂O) + 5 SiO2
which shews, in addition, the production of anhydrous carbonate of soda (N₁₂CO₂)
and of hydrated carbonate of soda (Na,CO, + 10H2O), that is to say, two compounds
capable of increasing the efficacy of the alkaline oxidising bodies employed for
bleaching.
As these
The quantity of the alkaline oxidising body can be very variable.
oxidising bodies are very energetic, they can be employed in very small quantities
in the mixture. Even in minute quantities they have the advantage of destroying
the reducing agents which may be contained in the other alkaline salts employed. By
way of example I will indicate the following mixtures:
A. Binoxide of sodium
Dry pulverised carbonate of soda
Liquid silicate of soda of commerce
2 kilos.
55
43
"

page_text: The temperature is then slightly raised and there is added the carbonate of soda
in small quantities while keeping the incorporator at work until the mixture has
been effected in an intimate manner. The mass is then allowed to cool very slightly
until it just begins to set; it is then run into moulds where it solidifies.
B. A second preparation (which is preferable on account of the decomposition
of the peroxide of sodium being less than that of the binoxide of sodium) is as
follows:-
a very contented Solution of monosticate of Soda of 105 density,
is first prepared hot in the known manner.
It is then allowed to cool to 50° C., and there are then added little by little the
42 kilos. of dry sodic carbonate. The incorporating machine is then set to work
while allowing the mixture to cool.
When this begins to become viscous, that is to say at about 32° C., there is
added little by little and with precaution, 5 kilos. of per-oxide of sodium, preferably
granulated. The incorporation is continued while allowing the mass to cool, and
the mixture is pressed into moulds when it has attained the necessary consistency.
In both the above cases, as also in the case of all other similar preparations, the
blocks thus formed are then removed from the moulds, and they are then cut by
sawing into pieces of any desired size.
For the purpose of increasing the protective coating, the pieces thus formed can
be dipped into a concentrated solution of silicate of soda or potash, or in a mixture
of these.
The formation of the protective coating of silicate can also be accelerated by
placing the sawn or moulded pieces in an atmosphere rich in carbonic acid, such as
cold combustion gases.
ABEL & IMRAY,
Agents for the Applicant.
Manufacture of Conglomerates containing Alkaline Oxidising Bodies
for Bleaching Linen and other objects.
I, LOUIS HENRY FRENTZ, of Laeken, Brussels, Belgium, 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 follow-
ing statement:-
This invention relates to a method of practically realising the application to the
bleaching of linen and other objects of alkaline oxidising bodies such as
binoxide of sodium of potassium of magnesium and other binoxides which can now be
supplied at reasonable prices by manufacturers thanks to the electro chemical
process.
The domestic and practical employment of these bodies, which are all very hygro-
scopic was more or less impossible up to the present time, the difficulty arising from
the impossibility of practically preserving them in the open air.
For the purpose of protecting them as much as possible from the action of the
atmosphere, I bring them into the form of glomerated bodies by mixing them with

page_text: other alkaline products employed for bleaching purposes, such as silicate of soda or
potash, carbonate of soda, borax, &c., the former having for its object to produce a pro-
tective silicious coating, while the latter have at the same time the effect of increas-
ing the efficaciousness of the oxidising body.
In effect the alkaline silicate (whether sodic or potassic) forms in consequence of
the action of the carbonic acid contained in the atmosphere a layer of silica (SiO2)
which is produced on the outer surface of the agglomerated bodies, so as to constitute
an effectual protective coating; this reaction is indicated by the equation
Na, SiO, 6 H„O)+5 CO,= 2 Na,CO₂+3 (Na,CO₂+10H„O)+5 SiC
The 53 kilos. of a very concentrated solution of monosilicate of soda of 1'65 density,
is first prepared hot in the known manner.
It is then allowed to cool to 50°C., and there are then added little by little the 42
kilos. of dry sodic carbonate. The incorporating machine is then set to work while
allowing the mixture to cool.
When this begins to become viscous, that is to say at about 32° C., there is added
little by little and with precaution, 5 kilos. of per-oxide of sodium, preferably granu-
lated. The incorporation is continued while allowing the mass to cool, and the
mixture is pressed into moulds when it has attained the necessary consistency.
In both the above cases, as also in the case of all other similar preparations, the
blocks thus formed are then removed from the moulds, and they are then cut by
sawing into pieces of any desired size.
For the purpose of increasing the protective coating, the pieces thus formed can
be dipped into a concentrated solution of silicate of soda or potash, or in a mixture
of these

page_text: The formation of the protective coating of silicate can also be accelerated by
placing the sawn or moulded pieces in an atmosphere rich in carbonic acid, such as
cold combustion gases.
Having now particularly described and ascertained the nature of this invention
and in what manner the same is to be performed, I declare that what I claim is :-
1. Method of practically effecting the application for bleaching purposes of alkaline
oxidising bodies, such as binoxide of sodium, of potassium and the like, consisting in
bringing them into the form of agglomerated bodies by mixing them with other
alkaline products, such as silicate of soda or of potash these being used either alone
or in combination with carbonate of soda, borax, or other alkaline salts, the silicate
having the object to produce a silicious protective coating upon the agglomerated
mass while the other salts have for their object to increase the efficacy of the
oxidising bodies.
2. In the process referred to in the first claim, the increasing silicic protective
coating by dipping the agglomerated bodies into a concentrated solution of silicate of
soda, or of potash, and if required accelerating its formation by exposing the said
bodies to an atmosphere rich in carbonic acid.
3. A manufacture of conglomerates containing alkaline oxidising bodies for
bleaching purposes substantially as described.
Dated this 2nd day of July, 1000
ABEL & IMRAY,
Agents for the Applicant.