Fine Synthesis And Characterization Of Alkylbenzene Sulfonates For EOR

Using p-xylene, different acyl chloride (fatty acid) and alkylogen, six kinds of isomers (alkyl aryl sulfonates) were synthesized, with similar structure, carbons of same quantity, and the position of alkylaryl dissimilarity. By orthogonal experiments, the effect of reaction time, temperature and the ratio of raw materials on the yield of 2,5-dimethylphenyldodecyl ketone was examined. The structure of intermediates and final products were confirmed to be correct by IR, 1H NMR, 13C NMR and ESI-MS.By measuring the surface tension, the surface properties of these six products were investigated. The results showed that as the aromatic ring shifting to the middle of the long carbonic chain, the cmc increased, andγcmc reduced gradually. The interfacial performance of the surfactant was also investigated. Through scanning interfacial tension measurement, nmin values of these six types of surfactants were given.which will offer data for screening and complex in practice. In addition, the interfacial tension behavior between surfactant and crude oil from No.4 factory of Daqing oilfield was also studied. The results showed that the dynamic interfacial tension between the surfactant and the crude oil increased slowly, and finally tended to remaining unchanged. As for the equilibrium interfacial tension, the product with aromatic ring in the middle of the long chain reduced greatly. It showed that if the degree of branching of alkylbenzene sulfonate became higher, the ability to reduce interfacial tension and the interfacial activity will be greater and better.