含有PO基团的阴非离子表面活性剂的制备及其抗盐性能研究

Preparation of anionic nonionic surfactants containing PO groups and their salt resistance properties

以脂肪醇聚氧丙烯醚、正己醇与马来酸酐为原料,合成了一种含有PO基团的抗盐型阴非离子表面活性剂MPHS。对其结构进行了表征。研究了其润湿、表界面、洗油以及耐盐性能。结果表明,MPHS可将油岩润湿角降低至47°,使用浓度为0.2%时可将油水界面张力降低至10-1mN/m,60℃下静态洗油效率达到25%以上。MPHS溶解性良好。在去离子水中的临界胶束浓度(cmc)为1.30×10^(-2)g/L,γ_(cmc)为29.88 mN/m。CaCl_(2)浓度为5000 mg/L时,cmc为1.09×10^(-2)g/L;γ_(cmc)为28.96 mN/m;NaCl浓度为50000 mg/L时,cmc为1.12×10^(-2)g/L,γ_(cmc)为29.01 mN/m。盐水对MPHS的泡沫性能有协同增效作用,最佳协同盐浓度为20 g/L NaCl,1 g/L CaCl_(2)。表明MPHS在较高矿化度地层具有优良的应用价值。

Using fatty alcohol polyoxypropylene ether,n-hexanol and maleic acid as raw materials,a salt-resistant anionic nonionic surfactant MPHS containing PO groups was synthesized.Its structure was characterized.Its wetting,surface interface,oil washing and salt resistance properties were studied.The results show that:MPHS can reduce the oil-rock wetting angle to 47°,the oil-water interfacial tension can be reduced to 10^(-1)mN/m when the concentration is 0.2%,and the static oil washing efficiency can reach more than 2.5%at 60℃.MPHS has good solubility.The critical micelle concentration(cmc)in deionized water is 1.30×10^(-2)g/L,and theγ_(cmc) is 29.88 mN/m.When the CaCl_(2)concentration is 5000 mg/L,the cmc is 1.09×10^(-2)g/L;theγ_(cmc) is 28.96 mN/m;when the NaCl concentration is 50000 mg/L,the cmc is 1.12×10^(-2)g/L,and theγ_(cmc) is 29.01 mN/m.Salt water has a synergistic effect on the foam performance of MPHS,and the best synergistic salt concentration is 20 g/L NaCl,1 g/L CaCl 2.It shows that MPHS has excellent application value in formations with higher salinity.