新型Gemini表活剂的合成及其降低油水界面张力性能

Synthesis and property of new Gemini surfactant in reducing oil-water interfacial tension

以胱氨酸钠和油酰氯为原料,通过1步反应合成了一种新型阴离子Gemini表面活性剂———二油酰胺基胱氨酸钠(Sodium dioleoylamino cystine,SDOLC),并利用界面张力仪研究了SDOLC降低油水界面张力性能。结果表明,利用地层水配制质量分数为0.10%的SDOLC溶液,可以在低碱质量分数下与大庆油田原油达到10-2mN/m量级的界面张力。Ca2+和Mg2+的存在使体系油水界面张力升高,络合剂羟基乙叉二膦酸四钠HEDP.Na4可以屏蔽Ca2+和Mg2+对界面张力的影响,增强体系的耐Ca2+和Mg2+能力,并降低碱剂的用量。

A new anionic Gemini surfactant, sodium dioleoylamino cystine （SDOLC） was synthesized by one-step reaetion of sodium cystine and oleoyl chlorine. The propery of reducing oil-water interfacial tension was investigated by interlace tensinmeter. It was found that S1）OLC solution of 0.1% content, made up by formation water, can obtain the interfaeial tension of 10^-2 mN/m magnitude of crude oil in Daqing Oilfieht at low alkali concentration. The oil-water interracial tension increases with the concentratinn of Ca^2＋ and Mg^2＋ increased, whereas this adverse effects were screened by adding complexing agent tetra sodium of 1-hydroxy ethylidene-1, l-diphosphonic acid（HEDP.Na4）. Furthermore, the presence of HEDP.Na4 improves the Ca^2＋, Mg^2＋ toleranee ability and reduces the alkali concentration fiw the SI）OLC/NaOH/HEI）P· Na4 mixed system.