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探索了碱木质素经H2O2预处理,再经磺化、胺化、烷基化合成驱油用表面活性剂的方法。首先考察了过氧化氢预处理条件对表面张力的影响。结果表明,当过氧化氢与碱木质素质量比为1∶10,温度70℃,处理时间30 min效果较好,经该条件预处理后合成的表面活性剂质量分数为0.9%时,表面张力降至24 mN/m。进一步考察碱、表面活性剂质量分数对孤岛原油油/水界面张力的影响,并与同条件下未经预处理合成的表面活性剂的油/水界面张力对比,结果表明,碱木质素经预处理合成的表面活性剂质量分数为0.4%时,与质量分数为0.4%NaOH复配后可使最低油/水界面张力达0.07 mN/m,较未经氧化预处理组稳定时间明显延长。红外光谱(FT-IR)分析表明了碱木质素改性前后结构的变化。
The alkali lignin was pretreated with H2O2 and then sulfonated, aminated and alkylated to synthesize surfactant for oil displacement. First of all, the effect of hydrogen peroxide preconditioning on surface tension was investigated. The results showed that when the mass ratio of hydrogen peroxide to alkali lignin was 1:10, the temperature was 70 ℃, the treatment time was 30 min, the surface tension of the synthesized surfactant was 0.9% Down to 24 mN / m. The effect of alkali and surfactant mass fraction on the interfacial tension of crude oil / water was also investigated. Compared with the interfacial tension of surfactants synthesized without pretreatment under the same conditions, the results showed that the alkali lignin When the mass fraction of synthesized surfactant is 0.4%, the minimum oil / water interfacial tension can reach 0.07 mN / m when compounded with 0.4% NaOH, which is significantly longer than that without oxidized pretreatment. Infrared spectroscopy (FT-IR) analysis showed that the structure of alkali lignin before and after the change.