Abstract: Using trifluoromethanesulfonic acid as catalyst for naphthalene alkylation was studied. The effects of catalyst dosage, temperature, the ratio of naphthalene and α-olefin, dropping time on the alkylation of naphthalene and the oxidation stability of alkylated naphthalene were investigated. The results showed that under the reaction conditions of a naphthalene/1-dodecene mole ratio of 1:3, a reaction temperature of 80 ℃, a dropping time of 3 h and a reaction time of 1 h, the kinematic viscosity of the alkylate is 16.35mm2/s at 100℃, the conversion reachs 96%. At the same time the bromine index is 168gBr2/(100g). No need to further hydrorefining process. The high pressure differential scanning calorimetry（PDSC）experiments showed that the antioxidant stability of PAOs increases with the addition of certain amount of alkylated naphthalene.

Key words: alkylation, trifluoromethanesulfonic acid, base oil, oxidation stability