Eor Synthesis And Interfacial Properties Of Surfactant

Alkylbenzene sulfonates are found in most surfactants used to enhance the oil recovery. It is significant to study the relationship between structures and interfacial properties of these surfactants for mechanism research of the oiling recovery.Alkyl phenones, prepared by acylation of benzene and acid chlorides with the reaction of fatty acids and SOCk, reacted with Grignard reagents to give carbinols (phenyl and hydroxy were attached to the same carbon) which were reduced to alkylbenzenes, alkylbenzenes were then sulfonated and neutralized to produce alkylbenzene sulfonates with unique structure. These products are confirmed to have phenyl attached in the middle carbons of alkyl chains, not first carbons. Pure samples were achieved by methods of recycling between ethanol and water.All the surfactants, synthesized by the article were analyzed through two phase titration and HPLC to show over 95% of purity, I3C and !H to prove true structures, MS to give right molecular weights. Some intermediates were also analyzed by GC and GC/MS.Interfacial tensions of 3,5,7,9-ocotadecylbenzene sulfonates against crude oil from Daqing and Shengli Oil Field and three pure alkanes were investigated, interfacial tension minima and dynamic interfacial tensions were observed with changes of surfactant and alkali concentrations. The interfacial effects were compared between certain surfactant and different oils or certain oil between different surfactants. Also gives explanations to some phenomenons.