Manufacturing the same.
Year: 1886

page_text: Date of Application, 9th Aug., 1886.
Complete Left, 1st Apr., 1887.
Complete Accepted, 3rd May, 1887.
Manufacturing the same.
I, PAUL JESERICH, Doctor of Philosophy, of 49 Klosterstrasse Berlin C., in the
German Empire, Chemist, do hereby declare the nature of this invention to be as
|follows :-
:-
Natural asphalt has generally been used for paving and other purpose, being either
employed alone or, according to its quality and the amount of bitumen in it, mixed
with more or less limestone, sand or other substance. An asphalt has also been
produced by mixing pure natural bitumen with limestone.
The improved process dispenses with natural asphalt or natural bitumen and
consists in the production of a material having the necessary qualities of the natural
asphalt.
The artificial asphalt, which is the object of this invention, is produced as follows:
Tar or similar non-volatile hydro-carbons are heated to a high temperature, sulphur
being added, until the peculiar tenacious fluidity and structure of bitumen of asphaltum
is attained.
During the addition of the sulphur a powerful reaction takes place with energetic
ovolution of sulphide of hydrogen and other sulphides.
After the reaction is finished and when the mass has obtained the desired con-
sistence and is still warm, it is mixed with pulverised limestone or silicates in a fine
state of subdivision or the like.
The material thus obtained has the qualities and appearance of natural asphalt and
may be easily worked by stamping when warm, for producing a solid paving for streets
etc with a thoroughly hard stony surface.
With this mode of manufacture, a hard or elastic and soft material can be obtained
at pleasure by more or less heat and greater or less amount of sulphur added during
the manufacture.
The finished material may also, if required, be mixed with natural asphalt.

page_text: A New or Improved Artificial Asphalt and Process for
Manufacturing the same.
I, PAUL JESERICH, Doctor of Philosophy, of 49 Klosterstrasse, Berlin C., in the
German Empire, 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 :-
Natural asphalt has generally hitherto been used for paving and other purpose being
either employed alone or mixed with more or less limestone, sand or other substance
according to its quality and the amount of bitumen in it. An asphalt has also been
produced by mixing pure natural bitumen with limestone.
The improved process dispenses with natural asphalt or natural bitumen and
consists in the production of a material having the necessary qualities of the natural
asphalt.
The artificial asphalt which is the object of this invention is produced as follows:
Tar or other somi-liquid or viscid hydro-carbons with a high boiling point are
heated in an iron boiler, if possible with indirect firing to a temperature of 130 to 200°
Centigrade, at which the material is maintained. Meanwhile sulphur is added by
degrees is small quantities according to the nature of the hydro-carbon employed, the
sulphur being in proportion of about 5 to 20 per cent of the hydro-carbon. The less
volatile the hydro-carbons are, and the higher their boiling point, the less is the per-
centage of sulphur required. The sulphur dissolves in the hot liquid hydro-carbon
with a powerful reaction and energetic evolution of sulphide of hydrogen and other
sulphides.
After the reaction is finished and the mass has obtained a consistence, which is
somewhat more fluid than the natural asphalt, it is transferred, while warm, into a
mixing apparatus and thoroughly mixed therein, under continuous agitation, with
pulverised limestone, silicate or the like. About 75 to 94 per cent of pulverised
stony material are required therefor.
The product thus obtained is transferred to a kiln where it is dried at a temperature
of about 120 to 150° Centigrade with frequent movement and turning over of the
material, for to 1 hours according to the quantity of material and the proportions
of mixture.
The mixing apparatus may be so constructed as to be adapted to be heated and
therefore to serve at the same time as a drying apparatus.
The powder obtained by drying has the qualities and appearance of natural asphalt
and may be easily worked by stamping when warm, for producing a solid paving for
streets etc. with a thoroughly hard stony surface.
With this mode of manufacture, a hard or elastic or soft material can be obtained at
pleasure by more or less heat and greater or less amount of sulphur added within. the
aforementioned limits.
The finished material may also, required, be mixed with natural asphalt.

page_text: 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). The process for the production of a material for paving and other purposes, the
said process consisting in the heating of tar to a temperature varying between 130 and
200° Centigrade, and the addition of sulphur, so that the finished material contains
about 5 to 20 per cent of the latter, in the addition to the product of 75 to 94 per cent
of pulverised limestone, silicate or stony matter and in drying the whole at a
temperature of 120 to 150° Centigrade.
2). As a material for paving and other purposes, the compound of tar and sulphur
substantially in the proportions set forth.
3). The compound of tar, sulphur and limestone or stony matter substantially in the
proportions set forth.