Abstract
Vegetable oils are perceived to be alternatives to mineral oils for lubricant base oils because of certain inherent technical properties and their biodegradability. Vegetables oils with high oleic contents are considered to be the best alternative to substitute conventional mineral oil-based lubricating oils and synthetic esters. This paper mainly reveals about extraction of oil from dry karanja seeds and study of its composition and physic-chemical properties and further its modification into trimesters to improve the oxidation and cold flow behavior. Here, we report the oxirane ring opening of epoxidized karanja oil using behenic acid and p-toluenesulfonic acid (PTSA) as catalyst followed by esterification reaction with octanol and 2-ethylhexanol to form diesters. The remaining free hydroxyl group was reacted with oleic and stearic acid to give triesters. The oil before modification has viscosity index, pour point and flash point of 172, -90C and 2120C and after modification it was 194cp, -360C and 3070C Â respectively, which can be easily used as metal working lubricant, hydraulic fluid turbine oil, refrigeration oil and food processing lubricant. The structures of the products were confirmed by FTIR, 1H- and 13C-NMR. Key words: karanja oil, epoxidation, oxidation stability, biolubricants.
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