The Manufacture of Novel Substances suitable for Tanning and for other Purposes.
Year: 1886

page_text: Date of Application, 18th Dec., 1886.
Complete Left, 19th Sept., 1887
Complete Accepted, 21st Oct., 1887
RESERIE
The Manufacture of Novel Substances suitable for Tanning and for
other Purposes.
ACHILLE BEDU of 11 Boulevard Bonne Nouvelle, Paris, France, Manufacturer
do hereby declare the nature of this invention to be as follows:
:-
The constitution of tannic acid has been demonstrated by Hugo Schiff who has
made the synthesis starting with diado-salicylic acid. He has proved the identity
of the reactions of sulphurous tannins with those of carbonic tannins (natural
tannins).
The present invention consists first in a mode of economically manufacturing a
tanno-sulphurous acid and further in the manufacture and application of tanno-
sulphites or sulpho-tannides-new antiseptic having remarkable tanning properties,
and also applicable for other purposes.
The tanno-sulphurous acid (a mixture of di- and tri-oxyphenolsulphurous acids)
is obtained by the oxidation of any of the various phenolsulphonic acids (sulpho-
conjugation of the phenols, ( H* (OH) SO² OH being a type) and their
homologues of which cresolsulphonic acid C H³ (OH) (CH³) SO² OH is a type.
The oxidation can be effected by different means, by peroxide of manganese for
example, or in a direct manner by pouring oxygenated water upon the sulphonic
body, but it is more advantageous to dissolve one equivalent of peroxide of barium in
two equivalents of sulphonic acid; this solution is treated by sulphuric acid. The
sulphate of barium which is precipitated is removed. The free oxygen oxidizes the
organic body and communicates to it tanning properties.
The tanno-sulphurous acid obtained can be employed directly in tanning in the
proportion of 4 per cent (96 parts of water and 4 parts of acid). Or salts can be
formed directly. The most advantageous method as regards cost and production is to
mix phenol- or cresol-sulphonic acid with one of the following bodies :-

page_text: The respective proportions indicated suffice to provoke an oxidation which is
continued by the air and there is formed a sort of organic alum with base of potass or
soda, that is to say-A tri-oxyphenyl-sulphite of manganese, chromium or aluminum
and of potass or soda. Traces of vanadate of ammonia produce a similar result.
In employing the new bodies for tanning, the hides or skins are immersed in a
solution containing 5 per cent. of a tri-oxyphenyl-sulphite, such as above described,
and the tanning is very rapidly effected.

page_text: I ACHILLE BEDU, of 11 Boulevard Bonne Nouvelle, Paris, France, Manufacturer,
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 constitution of tannic acid has been demonstrated by Hugo Schiff who has
made the synthesis starting with diado-salicylic acid. He has proved the identity
of the reactions of sulphurous tannins with those of carbonic tannins (natural
tannins).
The present invention consists first, in the manufacture in an economical manner
of a tanno-sulphurous acid, and further, in the manufacture and application of tanno-
sulphites or sulpho-tannides, -new antiseptic bodies having remarkable tanning
properties and also applicable for other purposes.
The tanno-sulphurous acid (a mixture of di- and tri-oxyphenolsulphurous acids) is
obtained by the oxidation of any of the various phenolsulphonic acids (sulpho
conjugation of the phenols, Cs H (OH) SO2 OH being a type) and their
homologues of which cresolsulphonic acid C H³ (OH) (CH³) SO² OH is a type.
The oxidation can be effected by different means by peroxide of manganese, for
example, or in a direct manner by pouring oxygenated water upon the sulphonic
body but it is more advantageous to dissolve one equivalent of peroxide of barium in
two equivalents of sulphonic acid. This solution is treated with sulphuric acid. The
sulphate of barium which is precipitated is removed. The free oxygen oxidizes the
organic body and communicates to it tanning properties.
The tanno sulphurous acid obtained can be employed directly in tanning in the
proportion of 4 per cent. (96 parts of water and 4 parts of acid).
Or, salts can be formed directly. The most advantageous method as regards cost
and production is to mix phenol- or cresol-sulphonic acid with one of the following
hadins

page_text: In employing these new substances or bodies in tanning, the hides or skins are
immersed for from 4 to 8 days in a solution containing 5 per cent. of say a tri-
oxyphenyl-sulphite such as above described; the tanning will be very rapidly effected
when the goods are subsequently treated with bark or tanning extracts; or the new
substances can be employed alone for tanning a solution containing 5 per cent. thereof
being suitable for the purpose.
Having now particularly described and ascertained the nature of my said Invention,
and in what manner the same is to be performed, I declare that what I claim is :--
1. The manufacture of a novel substance or novel substances suitable for tanning
and for other purposes by the oxidation of any of the various phenol sulphonic acids 1
or their homologues, as set forth.
2. The manufacture of tanno-sulphites or sulpho-tannides as set forth.