I give the figures
for a few imitations or adulterations:
Sp. gr. B.P.
No. 1 0.821 137 deg. C.
No. 2 0.884 165 deg. C.
No. 3 0.815 150 deg. C.
No. 4 0.895 156 deg. C.
There is a considerable difference in the flashing point, no doubt due
to the longer or shorter exposure of the crude turpentine, by which
more or less of the volatile portion escapes.
* * * * *
ON THE OCCURRENCE OF PARAFFINE IN CRUDE PETROLEUM.[1]
[Footnote 1: An abstract of thesis by E.A. Partridge, class of
'89, Univ. of Pa. Read before the Chemical Section of the
Franklin Institute by Prof. S.P. Sadtler.]
It is well known that the paraffine obtained by the distillation of
petroleum residues is crystalline, while that obtained directly (as in
the filtration of residuum) is amorphous. Ozokerite or ceresine
differs but slightly from paraffine, the principal distinction being
want of crystalline structure in it as found. Other characteristics,
such as the melting point, specific gravity, etc., vary in both, and
so are not of importance in a comparison. Hence it has been asked, Is
the paraffine occurring in petroleum and ozokerite identical with that
which is produced by their distillation? As crystalline paraffine
could be obtained from ozokerite by distillation alone, many persons
have supposed that it was engendered in the process.
Pages:
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116