摘要
以十四酸单乙醇酰胺为原料,通过乙氧基化、磺化反应得到了十四酸单乙醇酰胺醚磺酸盐(C14NE3S),测定了C14NE3S的溶解性,C14NE3S与C14酸二乙醇酰胺(C14DN)复配体系的表面张力以及与长庆原油的界面张力。实验结果表明,C14NE3S具有良好的耐盐性,C14NE3、C14NE3S在蒸馏水中cmc分别为0.07和0.158 mmol/L。溶液热力学理论研究表明,C14NE3S与C14DN摩尔比为1∶4和2∶3时在形成混合胶束时具有中等程度的相互作用。不同比例的复配体系界面张力为超低时对应的NaCl质量分数不同。随着复配体系中C14NE3S含量的增加,达到低或超低界面张力(10^(-2)或10^(-3)mN/m数量级)的盐质量分数范围及最高无机盐质量分数越来越大。n(C14NE3S)∶n(C14DN)=1∶4达到低界面张力时的盐质量分数为0.3%~1%NaCl,n(C14NE3S)∶n(C14DN)=2∶3和3∶2的复合体系达到超低界面张力时所对应的盐质量分数分别为0.3%~3%NaCl和5%~10%NaCl,体现出表面活性剂极性增强和矿化度增加有利于界面活性的提高。
To meet the requirements of oil production in high-salinity reservoirs,tetradecanoic acid monoethanolamide ether sulfonate(C14NE3S) was prepared from tetradecanoic acid monoethanolamide by ethoxylation and sulfonation.The solubility and the surface tension of the product were measured.The properties of C14NE3S when mixed with tetradecanoic acid diethanolamide( C14DN) were investigated.The interfacial activity between the binary mixed system and Changqing crude oil in mineralized water was also measured.The results showed that the aqueous solution of C14NE3S remained clear in 30% NaCl at above 30 ℃.The critical micelle concentrations of tetradecanoic acid monoethanolamide polyoxyethylene ether( C14NE3) and C14NE3S in distilled water were 0.07 and 0.158 mmol/L,respectively,indicative of the enhancement of hydrophilicity of C14NE3S due to the multiple hydrophilic groups.The theoretical study on solution thermodynamics showed that C14NE3S had synergism with C14DN for the formation of mixed micelles,especially when the molar fractions of C14NE3S were fixed to 0.2 and 0.4,the mixed systems showed moderate interaction.The interfacial tension of mixed surfactants in which the molar fraction of C14NE3S was 0.2 could be ultra-low to low( i.e.,10~(-3)-10~(-2) mN/m) in the presence of 0.3%-10% NaCl.The interfacial tension of mixed surfactant systems when n(C14NE3S) ∶n(C14DN) = 2∶3 and 3∶2 could be ultralow( order of magnitude,10~(-3) mN/m) at 0.3%-3% NaCl and 5%-10% NaCl,respectively.The mixed system with n(C14NE3S) ∶n(C14DN) of 1∶4 could show ultra-low interfacial tension at 0.3%-1% NaCl.This work could have a certain guiding role for the development of temperature-and salt-resistant oil-displacement surfactant systems.
作者
易晓
田富全
郑延成
王帅栋
蔡小军
罗芳草
常世腾
Xiao Yi;Fuquan Tian;Yancheng Zheng;Shuaidong Wang;Xiaojun Cai;Fangcao Luo;Shiteng Chang(College of Chemistry&Environmental Engineering,Yangtze University,Jingzhou,Hubei 434023,China;The 11^(th)Production Plant,Changqing Oilfield of CNPC,Qingyang,Gansu 745002,China)
出处
《日用化学工业（中英文）》
CAS
北大核心
2023年第6期609-616,共8页
China Surfactant Detergent & Cosmetics
基金
国家自然科学基金面上项目(51774049)
长江大学大学生创新创业训练计划项目(YZ2020100)。
关键词
十四酸单乙醇酰胺醚磺酸盐
烷醇酰胺
相互作用
表/界面张力
耐盐
tetradecanoic acid monoethanolamide ether sulfonate
alkanolamide
interaction
surface/interfacial tension
salt resistance
