摘要
壳聚糖分子本身具有大量的亲水位点(氨基),但仅含有少量的疏水位点(乙酰氨基)。同时,由于疏水基团的随机排布所产生的空间位阻,进一步减弱了其在油水界面吸附的能力。表面活性剂与壳聚糖分子之间能够形成混合吸附层,增大了界面膜强度,减缓液滴之间的聚并,进而协同增强乳状液的稳定性,提高了乳状液的耐温耐盐性能。将阴离子表面活性剂SDS和两性离子表面活性剂BS12与壳聚糖进行复配。通过水溶液分散体系稳定性及油水界面张力等因素对复配比例进行优化筛选,构筑出壳聚糖/表面活性剂的pH响应乳状液增效体系。借助动态光散射(DLS)、静态多重光散射(S-MLS)、界面张力及SEM等表征手段,研究了壳聚糖/表面活性剂复配体系及其形成的乳状液的pH响应行为,进而探明了壳聚糖与表面活性剂分子之间的协同增效作用机理。结果表明:壳聚糖/BS12展示出pH响应性能,兼具良好的提高采收率效果,为刺激响应型驱油体系的开发与应用提供了理论指导。
The chitosan molecule has a large number of hydrophilic sites(amino groups),but contains only a small number of hydrophobic sites(acetyl aminos),and the ability to approach the oil-water interface is further weakened due to steric hindrance caused by the random arrangement of hydrophobic groups.A mixed adsorption layer can be formed between the surfactant and chitosan molecules,which increases the strength of the interfacial film and slows down the aggregation between droplets,thereby synergistically enhancing the stability of the emulsion and improving the temperature and salt resistance of the emulsion.Therefore,the anionic surfactant SDS and the zwitterionic surfactant BS12 were compounded with chitosan in this work.The synergistic pH-responsive emulsion system of chitosan/surfactant was constructed by optimizing and screening the compound ratio by factors such as the stability of the aqueous solution dispersion system and the oil-water interfacial tension.Dynamic light scattering(DLS),static multiple light scattering(S-MLS),interfacial tension and SEM were employed to investigate the pH response behavior of chitosan/surfactant compounds and the resulting emulsions and then verify the synergistic mechanism between chitosan and surfactant.The results showed that chitosan/BS12 displayed good pH response performance as well as enhanced oil recovery capability.The current work provides theoretical guidance for the development and application of stimulus-responsive oil displacement system.
作者
吴海荣
苟聪博
张志琦
刘怀珠
杨红斌
侯吉瑞
WU Hairong;GOU Congbo;ZHANG Zhiqi;LIU Huaizhu;YANG Hongbin;HOU Jirui(National Key Laboratory of Petroleum Resources and Engineering,China University of Petroleum,Beijing 102249,China;Unconventional Petroleum Research Institute,China University of Petroleum,Beijing 102249,China;Exploration and Development Research institute of PetroChina Changqing Oilfield Company,Xi'an Shaanxi 710018,China;Nation Engineering Laboratory for Exploration and Development of Low Permeability Oil and Gas Fields,Xian Shaanxi 710018,China;Tangshan Jiyou Ruifeng Chemical Limited Company,PetroChina Jidong Oilfield,Tianjin 063500,China;School of Petroleum Engineering,China University of Petroleum(East China),Qingdao Shandong 266580,China)
出处
《当代化工》
CAS
2024年第3期620-630,659,共12页
Contemporary Chemical Industry
基金
国家自然科学基金项目(项目编号:52374053)
北京市优秀人才培养资助青年骨干个人项目(项目编号:2018000020124G163)。
关键词
壳聚糖
表面活性剂
PH响应
乳状液
提高采收率
Chitosan
Surfactant
pH stimulus-responsive
Emulsion
Enhanced oil recovery
