Abstract: Olefin and aromatic were used as raw material to prepare long chain alkylbenzene sulfonate by alkylation, sulfonation, and neutralization reactions. The effect of amount of the catalyst, adding velocity of promoter and the mole ratio of olefin to aromatic on the yield of alkylation reaction were investigated．The effects of the mass ratio of oil to acid and adding speed of acid on the interface performance were investigated. The optimum conditions for synthesis of long chain alkylbenzene sulfonate were determined. The interface performance of the long chain alkylbenzene sulfonate synthesized is superior to the petroleum sulfonate and heavy alkylbenzene sulfonate.

Key words: long chain alkylbenzene sulfonate, alkylation reaction, sulfonation reaction, interfacial tension