A study of the oxygen absorption characteristics and the nature of the products obtained from oils oxidizing under controlled conditions has permitted the evaluation of a number of factors involved in lubricating oil deterioration.Investigation of selected fractions of a distillate stock has shown considerable variations in reactivity toward oxygen.The rate of oxygen absorption approximately doubles for each 100 C. temperature increase over the interval 140°to 180°C ., provided it is not limited by physical factors. The presence or absence of water vapor in the oxidizing atmosphere has little effect on the oxidation of one type of oil.The oxidation of certain oils can be reduced greatly by adding natural or synthetic inhibitors.

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The high-temperature preparation of purple crystalline anhydrous chromium chloride (CrC13) by passing CC14 vapors over green Cr2O3 powder in an inert atmosphere is an instructive experiment in the inorganic chemistry laboratory. A systematic investigation of this synthesis (using a carefully calibrated tube furnace, X-ray powder diffraction, infrared spectroscopy, and gas chromatography) revealed that the products formed as a consequence of the pyrolysis of CC14 are sensitive to the reaction temperature . When Crz03 is present, the formation of CrC13 dominates at temperatures between 600°C and 800°C; at temperatures above 900°C, CsCls forms preferentially (presumably from the linking of the C-C1 free radicals produced by the pyrolysis) as the unreacted metal oxide is sintered to form eskolaite. In the absence of C1-203, the pyrolysis products are crystalline hexachloroethane (C2Cls) at 600°C and needle-shaped crystals of hexachlorobenzene at temperatures above 900°C .

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