In the fall of 1933 work on American Petroleum Institute Research Project 6 at the National Bureau of Standards, which up to that time had been confined to the naphtha fraction of petroleum, was extended to include the lubricating oil fraction. This paper gives the first report on the apparatus and methods developed for investigating the chemical constitution of lubr icating oil and describes the preliminary separation of the lubricant fraction of a midcontinent petroleum into "wax", "extract", and "water-white" fractions by dewaxing with ethylene chloride, extracting with sulphur dioxide, and filtering through silica gel. The results of the first four stages of distillation of the water-white oil al'e given.
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Mair et al. (1935) studied this question.