Study On High-activity Fluorocarbon Surfactants

Fluorocarbon surfactant is one of the most important special surfactants, its particular properties are usually included as high surface activity, high heat resistance, high chemical stability; fluoroalkyl is hydrophobic and oleophobic. Fluorocarbon surfactant is the most effective surfactant we ever know, on the one hand, it can reduce the surface tension of water or organic solvent to a very low value; on the other hand, the quantity needed is much less than others. Fluorocarbon surfactants also have well high complex ability. These special capabilities of the fluorocarbon surfactant make it applied widely. In the oilfield, fluorocarbon surfactants have the function that other hydrocarbon surfactants can not substitute. The influence of temperature, solvent, ratio and etc. on the productivity of N-[3-dimethylamido-propyl]perfluoroalkyl sulfonamide are discussed in the paper. So we get the good synthesized condition. Then the sulfoxyneurine, carboxyloxyneurine, Gemini and oxidoamine four fluorocarbon surfactants are synthesized by the intermediate. IR spectrum is taken to confirm their structure, then ion species for the fluorocarbon surfactants are identified by the method of chemical analysis. The surface activity of four fluorocarbon surfactants are designed, confirming their critical micelle concentration, and the effects of temperature and inorganic salts of surface activity are also evaluated. All of them have good chemical stability, temperature tolerance and salt tolerance. Both the effects of inorganic salts, temperature and oil proofness on foam character of two amphoteric fluorocarbon surfactants are researched. These amphoteric fluorocarbon surfactants exhibit very good foaming ability and foam stability and much better foam stability when have the oil.Then the surface activity of the fluorocarbon surfactant with anionic hydrocarbon surfactants,cationic hydrocarbon surfactants and nonionic hydrocarbon surfactant in different ratio are also studied.When it is applied with anionic hydrocarbon surfactants, the effects are better. The influence of the system such as the type of surfactant, system composition, density, temperature, inorganic salt and so on are discussed in the paper.All the results show that the fluorocarbon surfactants have many good characters, such as high surface ability, the low CMC, high temperature tolerance and salt tolerance. The fluorocarbon surfactants still exbit good foam characters when have the high content of oil. When they are applied with hydrocarbon surfactants, the synergic behavior is better. So the flourocarbon surfactants have high actual application in the oilfield.