Domestic coal tar light oil sources provide annually a total of 10 to 15 million gallons of mixed xylenes and C» aromatics, in the form of 1°, 3°, 5°, 10°, and industrial pure xylenes, together with solvent naphthas
ANALYTICAL EDITION 487 types, but which when dissolved at a suitable concentration gives a maximum spread between normal and branched paraffins. Tabulated data covering the necessary number of 10°C.-wide fractions can then be taken once, and the viscosity of an unknown sample determined at a later date concurrently with a control determination on a selected normal paraffin, to correct for resin or polymer aging.
AcknowledgmentOpportunity is taken to thank M. Lapeyrouse of the Esso Laboratories, Research Division, for helpful criticism in con-nection with this work. The authors are also indebted to M. R. Fenske, of the Pennsylvania State College, for supplying the majority of hydrocarbons studied.
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