Manufacture of a New Acid and Glycerine or Acid Glycerine and Alcohol Mixture, and its Application for Tanning or Preparing Leather.
Year: 1895

page_text: Date of Application, 10 h A r., 1895
Complete Specification Left, 6th Jan., 1896-Accepted, 22nd Feb., 1896
PROVISIONAL SPECIFICATION.
Manufacture of a New Acid and Glycerine or Acid Glycerine and
Alcohol Mixture, and its Application for Tanning or Preparing
Leather.
We,. MAX SCHMELTZER and Dr. CAMILLE ASCHMAN, Manufacturers, of
Ettelbruck, in the Grand Duchy of Luxemburg do hereby declare the nature of
this invention to be as folows:-
It is well known, that the application of mineral acids for swilling hides, has an
injurious effect, inasmuch as the leather made from the same becomes hard,
porous and liable to break, in which condition it does not answer the requirements
of good leather. The mineral acids appear to dissolve to some extent the glutinous
matter contained in the leather and thereby to produce the evils mentioned above.
In order to swill the hides in an acid bath so as to obtain faultless leather that is
supple and not liable to break in bending, we proceed as follows.
We produce a mixture of 3.5 parts of crude methylated spirit with 4 parts of
crude glycerine and then add 15 parts of sulphuric acid of 60° Bé., while constantly
stirring. When this mixture has cooled, we dilute it with water in the proportion
of 7 litres of the acid liquor to 5000 litres of water. The said proportion may,
however, be modified according to the nature of the hides. For thick and fresh
hides and for dry hides of transoceanic origin more glycerine and less alcohol is
used. Whether 10, 20, or 30 per cent. more glycerine has to be taken, can be
determined from the nature of the skin. Hides which are difficult to swill, can be
swilled much more quickly and completely by taking a larger percentage of
glycerine, than could be done by the means hitherto known. For very inferior
skins it is even advantageous, to exclude the crude spirit entirely from the
mixture.
The quantity of sulphuric acid to be employed is calculated from the quantity
of methyl- and ethyl-alcohol contained in the crude spirit, and from the quantity
of glycerine contained in the crude glycerine used.
The mixture prepared as described from sulphuric acid, methy-alcohol, ethyl
alcohol and glycerine has been shortly named "Malattinic acid."
Dated this 2nd day of Anril 1895.
FAIRFAX & WETTER,
Agents for the Applicants.
COMPLETE SPECIFICATION.
Manufacture of a New Acid and Glycerine or Acid Glycerine and
Alcohol Mixture, and its Application for Tanning or Preparing
Leather.
We, MAX SCHMELTZER, and Dr. CAMILLE ASCHMAN, Manufacturers, of
Ettelbruck, in the Grand Duchy of Luxemburg, 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 :-
It is well known, that the application of mineral acids for swilling hides has an

page_text: injurious effect, inasmuch as the leather made from the same becomes hard, porous
and liable to crack, in which condition it does not answer the requirements of good
leather. Mineral acids appear to dissolve to some extent the glutinous matter
contained in the leather and thereby to produce the evils mentioned above.
In order to swill the hides in an acid bath, so as to obtain leather which is supple
and not liable to crack in bending, we proceed as follows.
We produce a mixture of 3-5 parts of crude methylated spirit with 4 parts of
crude glycerine, and then add 15 parts of sulphuric acid of 60° Bé., while
constantly stirring. When this mixture has cooled, we dilute it with water in the
proportion of 7 litres of the acid liquor to 5000 litres of water. The said proportion
may however, be modified according to the nature of the hides. For thick and
fresh hides, and for dry hides of transoceanic origin more glycerine and less alcohol
is used. Whether 10, 20 or 30 per cent. more glycerine has to be taken may be
determined from the nature of the skin. Hides which are difficult to swill may be
swilled much more quickly and completely by taking a larger percentage of
glycerine, than could be done by the means hitherto known. For very inferior
skins it is even advantageous to exclude the crude spirit entirely from the
mixture.
The quantity of sulphuric acid to be employed is calculated from the quantity of
methyl- and ethyl-alcohol contained in the crude spirit, and from the quantity of
glycerine contained in the crude glycerine used.
The acid mixture, containing sulphuric methyl-alcohol, sulphuric ethyl-alcohol,
and sulphuric glycerine has been shortly named "Malattinic acid."
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 a mixture of sulphuric methyl-alcohol, ethyl-alcohol and
glycerine, substantially as described.
2. A new acid and glycerine, or acid, glycerine and alcohol mixture, substantially
as described.
3. The application of the above-described acid and glycerine, or acid, glycerine
and alcohol mixture in the art of tanning.
Dated this 2nd day of January 1896.
FAIRFAX & WETTER,
433, Strand, London, Agents.