The
acid is then neutralized and the paraffine extracted by petroleum
ether. On evaporation of the solvent, the paraffine is dried at 100 deg.
C. and weighed. Zaloziecki found, according to this method, in three
samples of Galician petroleums, 4.6, 5.8 and 6.5 per cent.,
respectively, of proto-paraffine. The method was carried out as above
with four samples of American petroleums, Colorado oil from Florence,
Col.; Warren County oil from Wing Well, Warren, Pa.; Washington oil
from Washington County, Pa.; Middle District oil from Butler County,
Pa., all furnished by Professor Sadtler.
They were very different in physical properties and in appearance, the
Colorado oil being a much heavier oil than the others and the
Washington oil being an amber oil, while the other two were of the
ordinary dark green color and consistence. The losses on distillation
to 200 deg. C. were very different, being about one-tenth in the case of
the Colorado oil and nearly one-half in the case of the others. The
percentages of partially refined proto-paraffine in the four reduced
oils (all below 200 deg. C. off) were as follows: for the Colorado oil,
23.9 per cent.; for the Warren oil, 26.5 per cent.; for the Washington
oil, 26.6 per cent.; and for the Middle District oil, 28.2 per cent.
The question now arises, What value has this determination of the
proto-paraffine which may exist in an oil? As before said, a portion
of the paraffine is always decomposed in distillation at temperatures
sufficiently high to drive over the paraffine oils, so the yield of
pyro-paraffine is always less than the proto-paraffine shown to be
present originally.
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