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Lubricating Oil Blending Stocks

Lubricating oils. Large number of natural lubricating and specialty oils are produced by blending a small number of lubricating oil base stocks and additives.. Important Properties of Lubricating Oils. ViscosityViscosity Index (VI)Pour pointOxidation resistanceFlash pointBoiling temperatureAc

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Lubricating Oil Blending Stocks

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    1. Lubricating Oil Blending Stocks CHE 735 Navid Omidbakhsh

    2. Lubricating oils Large number of natural lubricating and specialty oils are produced by blending a small number of lubricating oil base stocks and additives.

    3. Important Properties of Lubricating Oils Viscosity Viscosity Index (VI) Pour point Oxidation resistance Flash point Boiling temperature Acidity (neutralization number)

    4. Undesirable Characteristics High pour points Large viscosity changes with temp. (low VI) Poor oxygen stability Poor color High cloud points High organic acidity High carbon and sludge forming tendencies

    5. Lube Oil Processing Solvent deasphalting Reduce carbon- and sludge forming tendencies Solvent extraction/Selective Hydro cracking Improve viscosity Index Solvent Dewaxing Lower cloud and pour points Hydro treating/clay treating Improve color and oxygen stability

    6. Propane deasphalting Propane is used as the solvent to extract the lube oil from the asphalt The feedstock is contacted with 4 to 8 volumes of liquid propane. The extract phase contains from 15 to 20% by weight of oil with the remainder solvent. The heavier the feedstock, the higher the ratio of propane is required. The raffinate phase contains from 30 to 50% propane by volume and is not a true solution, but an emulsion of precipitated asphaltic material in propane.

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