双十二酰胺基甜菜碱的结构及界面性能  

Structure and Interfacial Properties of N,N-bis(dodecylamidoethyl)-Carboxybetaine

作　　者：刘学民[1,2] 李丹萍 杜光劲 贾国亮 崔正刚[1,2] 

机构地区：[1]食品胶体与生物技术教育部重点实验室(江南大学),江苏无锡214122 [2]江南大学化学与材料工程学院,江苏无锡214122

出　　处：《油田化学》2013年第1期60-63,共4页Oilfield Chemistry

摘　　要：以十二酸、二乙烯三胺等为原料,经酰胺化、甲基化反应合成了N,N-双-(十二酰胺乙基)-N-甲基胺,继而与氯乙酸钠反应制得双十二酰胺基甜菜碱。用红外光谱、质谱分析表征了目标产物的结构。结果表明,所合成的双十二酰胺基甜菜碱具有较好的表面活性,25℃时的临界胶束浓度c_(cmc)为1.2×10^(-5) mol/L,最低表面张力γ_(cmc)为25.38mN/m,饱和吸附时在气/液界面上的分子截面积为0.28 nm^2,小于双十二烷基甲基甜菜碱。双十二酰胺基甜菜碱的耐盐能力较好,0.01 mol/L NaCl对其表面活性的影响很小,c_(cmc)和γ_(cmc)有微小下降。将双十二酰胺基甜菜碱与其他表面活性剂复配,在无碱和混合表面活性剂质量分数0.05%～0.3%范围内,大庆原油与模拟地层水相间的界面张力最低达7.16×10^(-4) mN/m(45℃)。N, N-bis （ dodecylamidoethyl ）-carboxybetaine was prepared using sodium chloroacetate and N, N-bis （ dodecylamidoethyl ） -N-methylamine, which was synthesized by amidation and methylation reaction from dodecanoic acid and diethylenetriamine. And its chemical structure was confirmed by FT-IR and ESI-MS spectrometry. The results showed that N, Nobis （dodecylamidoethyl）- carboxybetaine had superior surface and interfacial activity, with 1.2× 10-5 mol/L critical mieelle concentration （cmc）, and 25.38 mN/m the lowest surface tension （γcmc） at 25℃. The minimum area per surfactant molecule at air/solution interface was of 0.28 nm2 at saturated adsorption, which was less than that of N, N-didodecyl-N-methyl-carboxybetaine. The product had a good tolerance to electrolytes, while 0.01 mol/L NaC1 had little effect on Como and γcmc. When N, Nobis （dodecylamidoethyl）-carboxybetaine was mixed with other surfactants, the interfacial tension between Daqing crude oil and connate water reduced to 7.16× 10^-4 mN/m at 45℃ over a wide surfactant dosage range from 0.05% to 0.3% without adding any alkaline agent.

关 键 词：双十二酰胺基甜菜碱 合成 性能 表面张力 界面张力 

分 类 号：O623.6[理学—有机化学] O623.7[理学—化学]