Synthesis And Interfacial Properties Of Alkyl Aryl Sulfonates

At present,the surfactants for domestic oil field lease test mainly depend on import, cost is very high. Many researches mainly focus on some mixed surfactants, petroleum sulphonates and heavy alkyl benzene sulfonates. I't difficult to satisfy the request for stable and high efficient enhanced oil recovery, now that these products are extremely uncertain, meanwhile, it's difficult to ascertain which product is the effective one. Therefore, to explore the low price and high efficient surfactant for enhanced oil recovery, which are prepared from distinguish clearly materials, has important using and realistic meaning.The alkylation of benzene with long-chain olefins has been performed in the presence of ionic liquid, the reaction conditions are optimized. It's found 100% conversion and more than 95% selectivity for the desired products, at the optimum conditions, can be achieved. It's found that the anions of ionic liquids determine, to a large extent, the physical and chemical properties of ionic liquids, but organic cations mainly influence the physical properties, and have a little impact on the catalytic performances. The alkylation of toluene with bromoalkanes has been investigated in ionic liquid. The conditions for the reaction are optimized, and the optimal reaction conditions are: 8:1 for toluene to bromoalkanes, 4:1 for cyclohexane to bromoalkanes at 40°C for 10min. 99.01% conversion of bromoalkanes and 99.46% target product can be obtained. I't easy to separate the products from the ionic liquid. The alkylbenzene and alkylmethylbenzene are sulfonated by using 20% oleum as the sulfonating agent. After separation of alkylbenzene sulfonic acid from sulfuric acid, neutralization and desalting, over 95% purity of desired products are obtained.The dynamic interfacial tensions(DIT) between crude oil, offered from DaQing Oilfield, and series of alkylbenzene sulfonates, alkylmethylbenzene sulfonates and alkylmethylnaphthalene sulfonates, flooding systems have been measured. Effect of concentration of surfactants, alkalines and salinity on the DIT behaviors are investigated. It's found that under the seemly conditions, DIT can reach and maintain ultralow at a long time, and even to reach 10^-5 mN.m^-1 at the optimum conditions. Long time ultralow DIT behavior has been got without alkalines in the mixed surfactants.The relationsip between the structure and properties is summarized. Hydrophilic-lipophilic balance, abbreviated HLB, is considered as the key parameters. The range of sulfonate surfactants suitful for tertiary oil recovery is given, which provide theoretical basis for the selection of surfactant used for tertiary oil recovery. The selection method has not been reported in the literature.