纳米SiO_2/表面活性剂对油水界面张力的影响  

Effect of nano-SiO_2/surfactant on oil-water interfacial tension

作　　者：王健[1] 吴一慧[1] 邓虹 金庭浩 WANG Jian;WU Yihu;DENG Hong;JIN Tinghao(Petroleum Engineering College of Yangtze University,Wuhan 430100,China)

机构地区：[1]长江大学石油工程学院,湖北武汉430100

出　　处：《能源化工》2018年第1期7-11,共5页Energy Chemical Industry

基　　金：长江大学横向科研项目资助(2014H1133)

摘　　要：以液体石蜡为油相,考察了疏水性纳米SiO_2对阴离子表面活性剂SDS、阳离子表面活性剂CTMAB与非离子表面活性剂OP-10的协同效应,以及Na Cl浓度对复配体系油水界面张力的影响。试验结果表明:纳米SiO_2与SDS和CTMAB之间具有良好的协同作用,且油水界面张力在400 s内变化明显,超过600 s后几乎不再变化;质量分数0.004%的纳米SiO_2与SDS和CTMAB复配后随着表面活性剂浓度升高(0.001 mol/L升至0.1 mol/L),协同效应越来越不明显,但表面活性剂浓度稀释至0.1 mmol/L后纳米颗粒分散稳定性差;随着NaCl浓度升高,与单一表面活性剂相比,SDS/SiO_2协同作用先增强后减弱,CTMAB/SiO_2协同作用持续减弱且200 s内界面张力变化幅度较大;纳米SiO_2与OP-10之间未观察到明显的协同作用,但OP-10分散稳定性强,即使在高矿化度也具有良好的分散能力。Using liquid paraffin as the oil phase,the synergistic effect of hydrophobic nano-SiO2 on the anionic surfactant SDS,the cationic surfactant CTMAB and the non-ionic surfactant OP-10,and the effect of NaCl concentration on the interfacial tension of the oil-water system are investigated.The experimental results show that nano-SiO 2 and SDS,CTMAB has a good synergy between,and the oil-water interfacial tension changes significantly within 400 s,almost no change after more than 600 s.After 0.004%nano-SiO2 is mixed with SDS and CTMAB,the synergistic effect becomes less and less obvious with the increase of the surfactant concentration(0.001 mol/L to 0.1 mol/L),but when the surfactant concentration is diluted to 0.1 mmol/L,nanoparticle dispersion stability becomes poor.With the increase of NaCl concentration,the synergistic effect of SDS/SiO2 first increases and then decreases as compared with the single surfactant,the synergistic effect of CTMAB/SiO2 decreases continuously and the change of interfacial tension within 200 s is larger.No obvious synergy is observed between nano-SiO2 and OP-10.However,OP-10 has good dispersion stability and good dispersibility even at high salinity.

关 键 词：纳米SIO2 表面活性剂 界面张力 分散稳定 

分 类 号：TQ423.4[化学工程]