Synthesis And Evaluation Of Polyalkoxylated Ether Sulfonates

In order to synthesize octylphenol polyoxyethylene ether sulfonate, octylphenol polyoxyethylene ether, as the raw material, was chloridized by thionyl chloride and sulfonated by sulphite. The structures of the products were measured by IR and NMR. The optimum conditions of synthesizing this sulfonate were confirmed by measuring the yield of each step through HPLC and two-phase titration. The optimum chlorinated reaction lasted 2 hours at 70℃, with pyridine as catalyst. For sulfonation, used potassium sulfite as the sulfonating agent, reacts with the intermediate with the molar ratio of 1.3∶1 at the temperature of 170℃in four hours.Acording to the above- mententioned synthesiny conditions, a series of aliphatic alcohol polyoxypropylene ether sulfonates and aliphatic alcohol polyoxyethylene ether sulfonates were synthesized. Their salt tolerance, foam performance, emulsification performance, thermal stability and interfacial tension were measured. Their salt tolerance indicated that polyalkoxylated ether sulfonates have some salt tolerance in which octylphenol polyoxyethylene ether sulfonate has the highest salt tolerance. For the surfactants with the same hydrophobic group, the salt tolerance decreases as the oxygen propylene groups increase. The foam performance of polyoxyethylene ether sulfonates is better than that of polyoxypropylene ether sulfonates, and the former is less influenced by sodium chloride and calcium chloride. The emulsification experiment showed that, polyalkoxylated ether sulfonate has good emulsifying capacity. When containing less salt, thirteen alcohol polyoxypropylene ether (4) sulfonate has better emulsification result. When containing more salt, thirteen alcohol polyoxyethylene ether (4) sulfonate has better emulsification result. The research of the interfacial tension indicated that, for the capacity of decreasing the interfacial tension, polyoxypropylene ether sulfonates are better than polyoxyethylene ether sulfonates. And as the hydrophobic group increase, the effect of decreasing interfacial tension is worse. When the oil phase is n-alkane, as the oxygen propylene groups in the surfactant increase, the effect of decreasing interfacial tension is better. When the oil phase is aromatic hydrocarbon, as the oxygen propylene groups in the surfactant increase, the effect of decreasing interfacial tension is worse. The optimum salt content of surfactant increases as the carbon numbers of alkanes in oil phase increase and decreases as the specific gravity of oil phase increases. Synergism was found in the mixtures of thirteen alcohol polyoxypropylene ether (4) sulfonate and Shengli petroleum sulfonate. In the mixtures, the solubility of SLPS is enhanced.