Composition of Lubricating Oil Use of Newer Separation and Spectroscopic Methods

Characterization of Thermal Diffusion Fractions of Petrolenes from a Mid-Continent Asphalt.

“…When narrow boiling range lubricant fractions are thermally diffused in the type of apparatus used here, there is essentially no fractionation of molecular weight (7,13). In general, in complex mixtures such as this petrolene fraction, shape differences between molecules may be expected to be more important in governing the separation than are mass differences.…”

Green polyurethane synthesis by emulsion technique: a magnetic composite for oil spill removal

“…This difference is due to the crude oil presence, which did not absorb heat in this temperature range. On the other hand, the second weight loss event, from 410 to 530 °C, is mainly related to the considerable presence of lubricating (C 26 -C 38 and 4-10 rings per molecule [29] ) and vacuum gas oil (mainly composed by high paraffins [30] ) inside tested petroleum. TGA results between 410 and 530 °C allowed inferring that composite, composite impregnated of petroleum and petroleum presented weight loss equal to 6.8wt%, 22.9wt% and 41.8wt%, respectively.…”

Carbon-Type Composition of Viscous Fractions of Petroleum. Density-Refractivity Intercept Method

“…Miron also discusses the degree of condensation of naphthene rings (26). A preponderance of the mass spectral data in the literature suggests (18, 25) that the saturated portion of lubricating oil contains about equal quantities of noncondensed (including monocycloparaffins) and condensed rings. The density data for the saturated structures were, therefore, recalculated assuming completely noncondensed rings.…”