محبوبه شیرانی

The esterification reactions between pentaerythritol and oleic acid have been followed in the presence of para toluene sulfonic acid catalyst at 4:1, 2:1, 1.5:1, and 1:1 acid –alcohol mole ratios. Considering the lubrication properties of the resulting products in each reaction indicates systematic increase of vis@40 °C, vis@100 °C, pour point, and flash point upon decreasing of the moles of oleic acid. In the case of viscosity index the reverse trend is observed. The lubrication properties were also compared with the corresponding data regarding some of mineral and synthetic base oils. The advantages and disadvantages of esteric products relative to recent oils were discussed. Finally, several industrial oils were equalized successfully by using the esteric base oils