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Scientific American Supplement, No. 288, July 9, 1881 · Chapter 14Composition of the Petroleum of the Caucasus
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By Mm. P Schutzenberger and N. Tonine
All portions of this petroleum contain saturated carbides of the formula CnH2n, which the authors name paraffenes. At a bright red heat they yield benzinic carbides, CnH2n-6, naphthalin and a little anthracen. At dull redness the products are along with unaltered paraffenes, products which unite energetically with bromine, and which are converted into resinous polymers of ordinary sulphuric acid. It is difficult to isolate, by means of fractional distillation, definite products with constant boiling points.