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Investigation of the Physical and Tribological Properties of Iso ‐Oleic Acid
Author(s) -
Biresaw Girma,
Ngo Helen,
Dunn Robert
Publication year - 2019
Publication title -
journal of the american oil chemists' society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.512
H-Index - 117
eISSN - 1558-9331
pISSN - 0003-021X
DOI - 10.1002/aocs.12177
Subject(s) - oleic acid , chemistry , isomerization , sunflower oil , materials science , organic chemistry , nuclear chemistry , catalysis , food science , biochemistry
Oleic acid was isomerized into iso ‐oleic acid using a modified ferrite zeolite catalyst. The isomerization produced a mixture of iso ‐oleic acid isomers, with a methyl branching at the double bond, whose position has been randomly distributed along the fatty‐acid chain. The effect of isomerization on the physical and tribological properties of iso ‐oleic acid relative to oleic acid was investigated. The neat fatty acids and their blends in polyalphaolefin (PAO‐6) and high‐oleic sunflower oil (HOSuO) base oils were used in the investigations. Relative to neat oleic acid, neat iso ‐oleic acid displayed: higher kinematic viscosity but lower viscosity index (VI) and acid number; lower pour point (PP) and cloud point (CP); better oxidation stability; similar four‐ball (4‐ball) antiwear friction and wear; and similar 4‐ball extreme pressure weld point. Blends (0–10%, w/w) of iso ‐oleic and oleic acid in PAO‐6 displayed the following similar trends with increasing concentration: mildly decreasing kinematic viscosity at 40 and 100 °C; increasing VI; lower coefficient of friction; and no change in wear. Blends (0–10%, w/w) of iso ‐oleic and oleic acid in HOSuO displayed the following similar trends: decreasing oxidation stability with increasing concentration; constant PP and CP with increasing concentration.