Patent ID: 8101560

Claim:
A process of producing lubricant base oil consisting of the steps of a) esterifying oleic acid with a polyhydric alcohol selected from diethyl propanediol in the presence of an acid catalyst selected from sulfuric acid, p-toluene sulfonic acid and acidic ion exchange resin at elevated temperature to yield diethylpropanedioyl dioleate, b) continuously removing water formed as a by-product during the reaction in (a) by distillation, c) removing the acid catalyst, impurities, and solvent from the resultant product of step (a) and (b), and d) in step (b) adding an azeotroping agent to facilitate continuous removal of water to yield a lubricant base oil, wherein the moisture content of the lubricant base oil is not more than 600 ppm, and the water separability of the lubricant base oil is not more than 30 minutes.