生物表面活性剂稳定的纳米铁溶胶合成及破乳性能评价
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1.长江大学化学与环境工程学院;2.长江大学石油工程学院;3.非常规油气湖北省协同创新中心;4.中国地质大学北京能源学院

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X52

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低渗透油藏提高原油采收率的生物化学基础研究(51634008),循环激活本源微生物提高原油采收率的基础研究(51574038),低渗-致密油藏高效提高采收率新技术(2017ZX05009-004),微生物提高浅层页岩气采收率的基础研究(51774257)。


Synthesis and demulsification performance evaluation of nano iron sol stabilized by biosurfactant
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School of Chemistry and Environmental Engineering, Yangtze University,

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    摘要:

    针对油田污水破乳过程中物理和化学破乳剂昂贵和污染问题,宜研究合成绿色环保的新型破乳剂。本文采用溶胶-凝胶与溶剂热法相结合的方法制备生物表面活性剂(Biosurfactant,BS)稳定的纳米铁溶胶材料,研究最优的BS浓度,并采用SEM、XRD、FTIR、激光粒度仪、Zeta电位等对BS稳定的纳米铁溶胶进行了表征,研究其形貌、尺寸、物相、官能团、溶胶稳定性、粒径分布等的影响因素。考察合成的纳米铁溶胶对涠洲岛上岸油水混合物配制的含油污水乳液的破乳性能。结果表明:在产糖脂类生物表面活性剂T菌以特定的培养基发酵6d后,取离心后上清液合成铁溶胶。上清液浓度为80%和100%时分别可合成200nm左右和40-200nm粒径的铁颗粒,浓度为60%时纳米铁溶胶产物破乳效果最优,低温下能对十二烷基硫酸钠形成的水包油乳液产生很好的破乳效果,24h后脱水率达到78%。说明本文采用的方法能合成具有良好破乳特性的BS稳定的纳米铁溶胶,建议今后将生物代谢物与化学药剂有机结合,制备对环境友好的复合纳米破乳剂,同时研究其重复使用等问题。

    Abstract:

    In view of the high cost and pollution of physical and chemical demulsifiers in the demulsification process of oilfield wastewater, it is necessary to study and synthesize new environmentally friendly demulsifiers. In this paper, a combination of sol-gel and solvothermal method is used to prepare biosurfactant (Biosurfactant, BS) stabilized nano-iron sol materials, to study the optimal BS concentration, and use SEM, XRD, FTIR, laser particle size analyzer, Zeta Potential etc. characterize the BS-stabilized nano-iron sol, and study its morphology, size, phase, functional group, sol stability, particle size distribution and other influencing factors. The demulsification performance of the synthesized nano-iron sol on the oily sewage emulsion prepared by the oil-water mixture on Weizhou Island was investigated. The results showed that after fermentation of the glycolipid biosurfactant T bacteria with a specific medium for 6 days, the supernatant after centrifugation was taken to synthesize iron sol. When the concentration of supernatant was 80 % and 100 %, iron particles with diameters of about 200 nm and 40 – 200 nm could be synthesized, respectively. When the concentration was 60 %, the demulsification effect of nano-iron sol product was the best. At low temperature, it could produce good demulsification effect on the oil-in-water emulsion formed by sodium dodecyl sulfate, and the dehydration rate reached 78 % after 24 h. It shows that the method used in this paper can synthesize BS stable nano-iron sol with good demulsification characteristics. It is suggested that biological metabolites and chemical agents should be combined organically in the future to prepare environmentally friendly composite nano-demulsifiers, while studying its repeated use and other issues.

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  • 收稿日期:2022-01-05
  • 最后修改日期:2022-02-28
  • 录用日期:2022-03-16
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