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A new hydrophobic surfactant, dodecyl lauroyl benzene sulfonate (DLBS), was synthesized and its application in enhanced oil recovery by alkali-surfactant-polymer (ASP) flooding was studied. The results show that DLBS can be synthesized by reaction of industrial dodecyl benzene with lauroyl chloride in the presence of AlCl 3 , followed by sulfonation with ClSO 3 H and neutralization with NaOH. The lauroyl-group is confirmed to be connected to the para-position of the alkylbenzene by  1 HNMR spectrum. The synthesized DLBS is well soluble in pure water and reservoir (connate) water at 45°C. It is highly surface active which is indicated by its low CMC of 1.1 · 10 −5  mol/L, and its low surface tension, γ cmc  of 28.6 mN m −1 . By mixing with heavy alkylbenzene sulfonates of relatively low average molar mass (387 g mol −1 ) at a total surfactant concentration of 5 mM, DLBS can reduce the interfacial tension of Daqing crude oil/connate water to an order of 10 −3  mN/m at 45°C in the presence of 0.5–1.0 wt.% NaOH and 1000 mg L −1  of polymer. If the NaOH was replaced by a gentle alkaline salt, Na 2 CO 3 , certain amounts of dodecyl dimethyl carboxy betaine were added and the concentration of Na 2 CO 3  was increased to 1.2–2.0 wt.%, the interfacial tension of Daqing crude oil/connate water can also be reduced to an ultralow value. Therefore DLBS is a good hydrophobic surfactant applicable in ASP flooding with either NaOH or Na 2 CO 3  as alkaline agents.

Synthesis of Dodecyl Lauroyl Benzene Sulfonate and its Application in Enhanced Oil Recovery