Abstract
A series of abietic monoester and amide have been prepared by esterification of abietic acid with long chain alcohol blend (Nafol 20
+
), polyethylene glycol (PEG 400, 600, 1000 and 4000) and hexadecylamine. The abietic diester derivatives were prepared by esterification of abietic-maleic anhydride adduct with Nafol 20
+
only or polyethylene glycol-1000 and Nafol 20
+
. These reactions were carried out to prepare eight abietic acid derivatives. The products were purified and characterized by FTIR and
1
H NMR analyses. The surface-active properties of these compounds were correlated with their effect on pour point and calorific values of crude oil. From the results, it has been found that the compound EA23-MN, which has the more negative value of ΔG
ad
, exhibited maximum pour point depression and increases the calorific values of crude oil and some distillates.