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In the earlier section of this symposium we have learned of the startling progress that has been made in recent years in the simplification of oil fractions through the application of powerful physical separation methods and in the identification of hydrocarbon types by the newer spectroscopic methods. Unfortunately, this straightforward approach to the problem is time consuming and expensive. And not all of those persons interested in the composition of oils have mastered the technique of thermal diffusion or can afford mass or nuclear magnetic resonance spectrometers. In this session there will be presented the development and successes of the various physical property correlations which are often applied to unseparated stocks. The physical properties most often used are density, refractive index, specific dispersion, molecular weight, and viscosity. Of these properties, I think most will agree that the measurement of average molecular weight of a sample is one of the most difficult experimentally. One of the papers deals with this technique. Some comparisons will be drawn with spectrometric methods and of the various physical property methods with each other.
LeTourneau, R. L.
California Research Corp., Richmond, Calif.