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Design Example: Deciding Thickness of Lubricating Fluid in a Shaft01:23

Design Example: Deciding Thickness of Lubricating Fluid in a Shaft

Effective lubrication between a rotating shaft and its bearing housing is essential in rotating machinery to minimize friction, wear, and energy loss. With carefully controlled thickness and viscosity, the lubricant layer prevents metal-to-metal contact, ensuring smooth operation.
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Surface Tension
The various IMFs between identical molecules of a substance are examples of cohesive forces. The molecules within a liquid are surrounded by other molecules and are attracted equally in all directions by the cohesive forces within the liquid. However, the molecules on the surface of a liquid are attracted only by about one-half as many molecules. Because of the unbalanced molecular attractions on the surface molecules, liquids contract to form a shape that minimizes the number...
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Esters can be hydrolyzed to carboxylic acids under acidic or basic conditions. Base-promoted hydrolysis of esters is a nucleophilic acyl substitution reaction in which esters react with an aqueous base, followed by an acid to give carboxylic acids. This reaction is also known as saponification because it forms the basis for making soaps from fats.
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Brown grease-derived ester base oils: tunable viscosity and cold-flow behaviour.

Ykok B Ksor1, Ashlyn D Smith1, Rhett C Smith1

  • 1Department of Chemistry, Clemson University Clemson SC 29634 USA rhett@clemson.edu.

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Summary

Bio-based ester base oils were synthesized from brown grease, showing tunable viscosity and improved cold-flow properties. Ester platform selection allows for precise control over viscosity grades and low-temperature performance.

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Area of Science:

  • Sustainable Chemistry
  • Materials Science
  • Tribology

Background:

  • Brown grease (BG) is an abundant waste stream with potential for valorization.
  • Developing sustainable base oils is crucial for reducing reliance on petroleum-derived products.
  • Existing bio-based lubricants often face challenges in viscosity control and low-temperature performance.

Purpose of the Study:

  • To convert brown grease into various bio-based ester base oils.
  • To evaluate the physicochemical properties and performance of these novel base oils.
  • To establish structure-property relationships for designing tailored lubricants.

Main Methods:

  • Transesterification of brown grease to fatty acid esters (FAMEc, FAEEc, FAPEc).
  • Hydroxylation and epoxidation of esters to create diverse base oil candidates.
  • Characterization of thermal stability, viscosity, pour point, and crystallization behavior (DSC).
  • Tribological testing (ASTM D4172) to assess friction and wear.

Main Results:

  • Transesterification reduced viscosity and improved cold-flow properties compared to crude BG.
  • Hydroxylation increased viscosity with minor pour point penalties.
  • Epoxidation significantly boosted viscosity, with performance dependent on the ester cap.
  • Epoxidized isopentyl ester (e-FAPEc) achieved ISO VG 68 with a pour point of 3 ± 3 °C.
  • Friction and wear varied with ester platform, with hydroxylated ethyl ester (h-FAEEc) showing lowest friction and FAPEc showing poorest wear resistance.

Conclusions:

  • Ester platform selection is a key strategy for tuning viscosity grade and low-temperature performance of brown grease-derived base oils.
  • The synthesized bio-based esters offer a promising route to sustainable lubricants with adjustable properties.
  • This study provides a design framework for developing high-performance lubricants from waste feedstocks.